Page 1 100 MHz and 3.3/2.9 volts. Disk storage The 420CDT has an internal 1.3 billion byte (1.26 GB) or 810 million byte (770 MB) Hard Disk Drive (HDD). The 420CDS has an internal 810 million byte HDD. A 3.5- inch Floppy Disk Drive (FDD) supports 2HD (1.44 MB) floppy disks and 2DD (720 KB) floppy disks.
Page 2 Batteries Three different batteries: an Li-Ion main battery, a backup battery (for memory backup), and an RTC battery (for Real Time Clock). Expansion memory slot An optional 8, 16, or 32 MB memory module can be installed in the memory slot. Parallel port Can be used to connect a Centronics compatible printer or other parallel device.
Page 3 Infrared port Incorporates an IrDA1.0 (115.2Kbps supported) standard infrared transmitter and receiver. Sound System A Sound Blaster Pro compatible sound system provides capability to record sound and play it back with a built-in microphone and speaker. The sound system is equipped with a volume control dial, headphone jack, microphone jack, and audio line-in jack.
Page 4: System Unit Block Diagram
System Unit Block Diagram Figure 1-3 is a block diagram of the 420 series system unit. Figure 1-3 420 series system board block diagram 420 Series...
Page 5 The 420 series system board is composed of the following major components: Microprocessor One Intel Pentium processor with VRT 64-bit microprocessor Intel Pentium processor operates at 100 MHz and 3.3/2.9 volts Standard RAM 8 MB, four 1Mx16-bit chips 3.3 volt operation No parity bit Access time 60 ns Data transfer is 64-bit width...
Page 6 System Controller Gate Array (SCPCNT-GA) This gate array has the following functions: • CPU control SMI control CPU clock control • Memory control 64-bit bus memory control 32-bit bus memory control • Bus control 64-bit data bus <==>32-bit data bus 32-bit local bus control •...
Page 7 • Others Speaker volume adjust PWM control Sound board interface BIOS-ROM interface SMI control IrDA (SIR) control Video Controller Chips & Technologies F65550 is used This video controller controls internal TFT/DSTN color LCD and external SVGA compatible CRT. Keyboard Controller (KBC) One M38802M4 chip is used This KBC includes the keyboard scan controller and keyboard interface controller.
Page 8 3.5-inch Floppy Disk Drive The 420 series 3.5-inch removable FDD is a thin, high-performance reliable drive that sup- ports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD disks. When a CD-ROM is installed in the Selectable Bay, an FDD attachment can be used to connect the FDD to an external FDD port.
Page 9 The Hard Disk Drive is a random access non-volatile storage device. It has a non-removable 2.5-inch magnetic disk and mini-winchester type magnetic heads. The 420CDT supports 1.3 billion bytes (1.26GB) and 810 million bytes (770MB). The 420CDS supports 810 million bytes (770MB).
Page 10 Keyboard The 82-(USA) or 84-(European) key keyboard is mounted on the 420 series system unit. The keyboard is connected to the keyboard controller on the system board through a 25-pin flat cable. The 420 series pointer control stick, located in the center of the keyboard, provides convenient control of the cursor without requiring desk space for a mouse.
Page 11 CD-ROM Drive The 420 series internal CD-ROM drive accommodates either a 12 cm (4.72-inch) or an 8 cm (3.15-inch) CD. It provides high-performance six-speed play (reads 900KB per second). This drive supports the following formats: Audio CD Photo CD ISO 9660 CD Plus The CD-ROM drive is shown in Figure 1-7.
Page 12 DSTN Color LCD (420CDS) The DSTN Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp (FL), and an FL inverter board. 1.7.1 DSTN Color LCD Module The DSTN color LCD is backlit and supports 800x600 pixels with built-in display controller. This controller includes the functions of Video Graphics Array (VGA) and Super VGA (SVGA) for external display.
Page 13 1.7.2 DSTN Color Fluorescent Lamp (FL) Inverter Board The FL inverter board supplies high frequency current to light the LCD Fluorescent Lamp. The specifications for the FL inverter are listed in Table 1-5. Table 1-5 DSTN color FL inverter board specifications Item Specifications Input...
Page 14 TFT Color LCD (420CDT) The TFT Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp (FL), and an FL inverter board. 1.8.1 LCD Module The TFT color LCD is backlit and supports 800x600 pixels with built-in display controller.
Page 15 1.8.2 Fluorescent Lamp (FL) Inverter Board The FL inverter board supplies high frequency current to light the LCD Fluorescent Lamp. The specifications for the FL inverter are listed in Table 1-7. Table 1-7 FL inverter board specifications Item Specifications Input Voltage 4 to 5.5 Power...
Page 16: Power Supply
Power Supply The power supply provides five kinds of voltages to the 420 series system board. The 420 series power supply has one microprocessor and it operates at 500 KHz. It contains the following functions: Determines if the AC cable or battery is connected to the computer. Detects AC output and circuit malfunctions.
Page 17 1.10 Batteries The 420 series has three types of batteries: Main battery pack Backup battery Real Time Clock (RTC) battery Battery specifications are listed in Table 1-9. Table 1-9 Battery specifications Battery name Material Output voltage Capacity Main battery Lithium-Ion 10.8 V 3,600 mAH Backup battery...
Page 18 Quick Battery Charge When the AC power cord is attached, there are two types of charge: quick charge when the system is powered off and trickle charge when the system is powered on. Table 1-10 Time required for quick charges Charging time Power off About 2 to 3 hours...
Page 19 1.10.4 RTC Battery The RTC battery provides power to keep the current date, time, and other setup information in memory while the computer is turned off. Table 1-12 shows the charging time and data preservation period of the RTC battery. Table 1-12 RTC battery charging/data preservation time Time Charging Time...
Page 20: Troubleshooting
PS/2 or compatible mouse Serial port wraparound connector PC card wraparound card Multimedia sound system with line-in and line-out ports Headphone CD-ROM drive Toshiba EMI test disk TDY-03 Music CD Lens cleaner for CD ROM laser pickup lens 420 Series...
Page 21: Troubleshooting Flowchart
(F31PRT), then turn the POWER switch on. The computer will override the password function by erasing the current password. Verify with the customer that Toshiba MS-DOS is installed on the hard disk. Non- Toshiba operating systems can cause the computer to malfunction.
Page 22 Figure 2-1 Troubleshooting flowchart 420 Series...
Page 23 Figure 2-1 Troubleshooting flowchart (Continued) If the diagnostics program cannot detect an error, the problem may be intermittent. The Running Test program should be executed several times to isolate the problem. Check the Log Utilities function to confirm which diagnostic test detected an error(s), then perform the appropriate troubleshooting procedures as follows: If an error is detected on the system test, memory test, display test, ASYNC test, printer test, or real timer test perform the system board troubleshooting proce-...
Page 24: Power Supply Troubleshooting
Power Supply Troubleshooting The 420 series power supply controls many functions and components in the 420 series. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are: Procedure 1: AC IN Icon Check Procedure 2:...
Page 25 Procedure 2 Battery Icon Check The Battery icon shows the battery charging status. The Battery icon glows orange when the AC power cord is charging the 420 series battery pack. If the Battery icon glows green, the AC power cord is connected and the battery is fully charged.
Page 26 If an error message is shown on the display, perform Check 1. If there is no error message, go to Procedure 2. If the Toshiba MS-DOS is properly loaded, go to Procedure 3. Check 1 If one of the following error messages is displayed on the screen, press the F1 key as the message instructs.
Page 27 Check 2 If the following error message is displayed on the screen, press any key as the message instructs. WARNING: RESUME FAILURE. PRESS ANY KEY TO CONTINUE. This error message appears when data stored in RAM under the resume function is lost because the battery has become discharged or the system board is damaged.
Page 28 Procedure 2 Printer Port LED Check on Boot Mode The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for boot mode. Figure 2-2 shows the printer port LED. Figure 2-2 Printer port LED To use the printer port LED follow these steps: Turn on the power, then set to boot mode.
Page 29 Table 2-1 Printer port LED boot mode status LED status Test item Message KBC initialization ROM checksum test BIOS is damaged! ..Special register initialization PIT test PIT ERROR PIT initialization — PIT function check MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS check CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR...
Page 30 Table 2-1 Printer port LED boot mode status (Continued) LED status Test item Message Initialization of expansion ROM — Password check — Setup boot check *** Bad xxxx xxxx *** Check system. Then press [F1] key. Boot load — Check 1 If any of the following error codes are displayed, go to Procedure 5.
Page 31 Procedure 3 Printer Port LED Check on Resume Mode The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for resume mode. To use the printer port LED follow these steps: Turn on the power, then set to resume mode.
Page 32 Procedure 5 Replacement Check The system board or the sound board may be damaged. Disassemble the 420 series following the steps described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Replace the system board with a new one. Refer to Chapter 4 for instructions on how to remove and replace the system board.
Page 33 FDD head cleaning is one option available in the Diagnostic Program. Detailed operation is given in Chapter 3, Tests and Diagnostics. After Toshiba MS-DOS loads, run the Diagnostic Program and then clean the FDD heads using the cleaning kit. If the FDD still does not function properly after cleaning, go to Proce- dure 2.
Page 34 Diagnostic Test Program Execution Check The Floppy Disk Drive Diagnostic Test program is stored on the 420 series Diagnostics Disk. After loading Toshiba MS-DOS, run the diagnostic program. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostics test procedures.
Page 35 Procedure 3 Connector Check and Replacement Check The 3.5-inch Floppy Disk Drive is connected to the FDD port by the FDD cable. This cable may be damaged or disconnected from the external 3.5-inch FDD port. Do the following checks: Check 1 Make sure the FDD cable is firmly connected to the FDD port.
Page 36: Hard Disk Drive Troubleshooting
Manual for more information about how to perform the BACKUP. Procedure 1 Partition Check Insert the Toshiba MS-DOS system disk, turn on the computer, and perform the following checks: Check 1 Type C: and press Enter. If you cannot change to drive C, go to Check 2. If you can change to drive C, go to Procedure 2.
Page 37 Non-System disk or disk error Replace and press any key Check 3 Using the Toshiba MS-DOS system disk, install a system program on the hard disk using the SYS command. If the following message appears on the display, the system program has been transferred to the HDD.
Page 38 HDD. If the following message appears on the display, the HDD is formatted. Format complete If any other error message appears on the display, refer to the Toshiba MS-DOS Manual for more information and perform Check 2. Check 2 Using the 420 series Diagnostic Disk, format the HDD with a low level format option.
Page 39 Procedure 4 Diagnostic Test Program Execution Check The HDD test program is stored in the 420 series Diagnostics Disk. Perform all of the HDD tests in the Hard Disk Drive Test. Refer to Chapter 3, Tests and Diagnostics, for more information about the HDD test program.
Page 40: Keyboard Troubleshooting
Keyboard Troubleshooting To determine if the 420 series keyboard is functioning properly, perform the following proce- dures. Start with Procedure 1 and continue with the other procedure as instructed. Procedure 1: Diagnostic Test Program Execution Check Procedure 2: Connector and Replacement Check Procedure 1 Diagnostic Test Program Execution Check Execute the Keyboard Test in the Diagnostic Program.
Page 41 The Display Test program is stored on the 420 series Diagnostic Disk. This program checks the display controller on the system board. After loading Toshiba MS-DOS, run the Diagnos- tic Program. Refer to Chapter 3, Tests and Diagnostics, for details.
Page 42 Procedure 4 Connector Check The Display unit has an LCD module, FL, Display switch, and FL inverter board. The FL and FL inverter board are connected by two cables. The LCD module and system board are connected by two signal cables as shown below. Any of these cables may be disconnected. Disassemble the display unit and check the following cable connections.
Page 43 Figure 2-4 420CDT display connection If any of these cables is not connected, firmly reconnect it and repeat Procedures 1 and 2. If the problem still exists, perform Procedure 5. 2-24 420 Series...
Page 44 Procedure 5 Replacement Check The FL, FL inverter board, LCD module, and system board are connected to the display circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement Proce- dures, for instructions on how to disassemble the computer and then perform the following checks: If the FL does not light, perform Check 1.
Page 45 After Toshiba MS-DOS loads, run the diagnostic program stored on the test program dis- kette. Insert a test CD (Toshiba-EMI Test Disc TDY-03) into the CD-ROM drive and run the test. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnos- tics test procedures.
Page 46 Procedure 3 Connector Check and Replacement Check The CD-ROM drive is connected to the system board and sound board by the CD-ROM drive cable. This cable may be damaged or disconnected from the system board. Disassemble the 420 series following the steps described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1 Make sure the CD-ROM is firmly connected to the system board.
Page 47: The Diagnostic Test
The Diagnostic Test This chapter explains how to use the Diagnostic Test program to test the functions of the computer’s hardware modules. The Diagnostics Program is stored on the Diagnostic Disk and consists of nine programs that are grouped into the Service Program Module (DIAG- NOSTICS Menu).
Page 48 A printer wraparound connector for the printer wraparound test (Printer test) An RS-232-C wraparound connector for the RS-232-C port wraparound test (ASYNC test) A CD test media (Toshiba-EMI test disk TDY-03 and music CD) (CD-ROM test) External CRT (All tests) PS/2 or compatible keyboard (All tests)
Page 49: Executing The Diagnostic Test
Executing the Diagnostic Test Toshiba MS-DOS is required to run the DIAGNOSTICS PROGRAM. To start the Program follow these steps: Insert the Diagnostics disk into the floppy disk drive and turn on the computer. (The Diagnostics disk contains the MS-DOS boot files.)
Page 50 To select the DIAGNOSTIC TEST MENU from the DIAGNOSTICS MENU, set the highlight bar to 1, and press Enter. The following screen will appear: TOSHIBA personal computer xxx DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 - SYSTEM TEST...
Page 51 Select the desired subtest number from the subtest menu and press Enter. The following message will appear: TEST LOOP : YES ERROR STOP : YES Use the arrow keys to move the cursor from the subtest menu and press Enter. Selecting YES for TEST LOOP sets the test to run continuously until it is halted by the user.
Page 52: Subtest Names
Subtest Names Table 3-1 lists the subtest names for each test program in the DIAGNOSTIC TEST MENU. Table 3-1 Subtest names Test name Subtest No. Subtest item SYSTEM ROM checksum Fan ON/OFF Thermistor check MEMORY RAM constant data RAM address pattern data RAM refresh Protected mode Memory module...
Page 53 Table 3-1 Subtest names (Continued) Test name Subtest No. Subtest item ASYNC Wraparound (board) Board(#1) <=> board(#2) Point to point (send) Point to point (receive) Interrupt test Infra_red Wrap_around test Infra_red Transmit mode Infra_red Receive mode Noise Receive test Sequential read Address uniqueness Random address/data Cross talk &...
Page 54: System Test
System Test To execute the System Test, select 1 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 ROM checksum This subtest executes a checksum test of the BIOS ROM on the system board.
Page 55: Memory Test
Memory Test To execute the Memory Test, select 2 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 RAM constant data This subtest writes a 256-byte unit of constant data to conventional memory (0 to 640 KB), then reads the new data and compares the result with the original...
Page 56 Subtest 05 Memory module NOTE: To execute this subtest, an optional memory card must be installed in the computer. This subtest functions the same as subtest 04, except it is used for testing an optional memory card. Memory module capacity is 8 MB, 16 MB, and 32 After selecting subtest 05, the following message will appear: Extended memory size (1:8 MB,2:16 MB,3:32 MB)?
Page 57: Keyboard Test
Keyboard Test To execute the Keyboard Test, select 3 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Keyboard test contains four subtests that test the keyboard, PS/2 mouse, and AccuPoint actions. Move the highlight bar to the subtest you want to execute and press Enter.
Page 58 Subtest 02 Pressed keycode display When a key is pressed, the scan code, character code, and keytop name are displayed on the screen in the format shown below. The Ins, Caps Lock, Num Lock, Scroll Lock, Alt, Ctrl, Left Shift, and Right Shift keys are displayed in reverse screen mode when pressed.
Page 59 Subtest 04 Pointing Stick This subtest checks the functions of the pointing stick as shown below. A) IPS stick pressure sensing direction and parameter. B) IPS switch function check. This test reports the pointing stick motion response from the IPS and IPS switch by displaying the location parameters.
Page 60: Display Test
Display Test To execute the Display Test, select 4 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Display test contains six subtests that test the display in various modes. Move the highlight bar to the subtest you want to execute and press Enter.
Page 61 Subtest 04 Gradation & Mode test for VGA This subtest displays gradations for each mode. Execute the test, then press Enter to change the mode. LCD type Mode 3, 12, 13, 43, 52 DSTN 3, 12, 13, 43 The display below appears on the screen when this subtest is executed. Pressing Enter changes the size of the displayed image.
Page 62 Pressing Enter changes the size of the displayed image. Pressing Enter changes the size of the displayed image. Pressing Enter changes the size of the displayed image. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break.
Page 63 Subtest 06 “H” pattern display This subtest displays a full screen of “H” patterns. HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break.
Page 64: Floppy Disk Test
Floppy Disk Test NOTE: Before running the floppy disk test, prepare a formatted work disk. Remove the Diagnostics Disk and insert a work disk into the FDD. The contents of the floppy disk will be erased. To execute the Floppy Disk Test, select 5 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen.
Page 65 Subtest 01 Sequential Read This subtest performs a Cyclic Redundancy Check (CRC), that continuously reads all the tracks on a floppy disk. The following tracks are read according to the media type in the floppy disk drive: Double-sided, double-density (2D): Tracks 0 to 39. Double-sided, double-density, double-track (2DD) and double-sided, high-density, double-track (2HD): Tracks 0 to 79.
Page 66: Printer Test
Printer Test To execute the Printer Test, select 6 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Printer Test contains three subtests that test the output of the printer connected to the computer. NOTE: An IBM compatible printer must be connected to the system to execute this test.
Page 67 Subtest 02 Function This subtest is for IBM compatible printers, and tests the following functions: Normal print Double-width print Compressed print Emphasized print Double-strike print All characters print This subtest prints the various print types shown below: PRINTER TEST THIS LINE SHOWS NORMAL PRINT. THIS LINE SHOWS DOUBLE-WIDTH PRINT.
Page 68: Async Test
3.10 Async Test To execute the Async Test, select 7 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The async test contains nine subtests that test the asynchronous communication functions. Move the highlight bar to the subtest you want to execute and press Enter.
Page 69 Subtest 03 Point to point (Send) NOTE: To execute this subtest, two machines must be connected with an RS-232-C direct cable. One machine should be set as “send”(subtest 03) and the other set as “receive” (subtest 04). The wiring diagram for the RS-232-C direct cable is described in Appendix F.
Page 70 Subtest 08 Infra_red Receive mode This subtest is used with subtest 07 described above. This subtest receives the data from the send side, then sends the received data through the SIR port. Subtest 09 Noise Receive test This subtest receives just noise level as a signal. By detecting random 0 and 1, this subtest recognizes that the SIR port (transmitter/receiver module) works properly.
Page 71: Hard Disk Test
1. If MS-DOS 6.22/Windows for Workgroups is selected, use the Master Diskette Creator (MDC) utility in the Toshiba Utility folder to back up the preinstalled software. After backing up the preinstalled software, use the BACKUP command in the Toshiba Companion Utility to back up the entire disk, including the user’s files.
Page 72 Select 1 or 2 and press Enter. The following message will appear: Detail status display (1:no,2:yes) ? This message is used to select the error dump operation when a data compare error is detected. Select 1 or 2 and press Enter. The Hard Disk Test message will appear after you respond to the Detail Status prompt.
Page 73 Subtest 04 Cross Talk & Peak Shift This subtest writes eight types of worst pattern data (shown below) to a cylinder, then reads the data while moving from cylinder to cylinder. Worst pattern data Cylinder ‘B5ADAD’ 0 cylinder ‘4A5252’ 1 cylinder ‘EB6DB6’...
Page 74: Real Timer Test
3.12 Real Timer Test To execute the Real Timer Test, select 9 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions on the screen. The real timer test contains three subtests that test the computer’s real timer functions. Move the highlight bar to the subtest you want to ex- ecute and press Enter.
Page 75 Subtest 03 Real Time Carry CAUTION: When this subtest is executed, the current date and time are erased. This subtest checks the real time clock increments, making sure the date and time are displayed in the following format: Current date : 12-31-1995 Current time : 23:59:58 Pressing Enter displays the following Current date : 01-01-1996...
Page 76: Ndp Test
3.13 NDP Test To execute the NDP test, select 10 from the DIAGNOSTICS TEST MENU, press Enter and follow the directions on the screen. The NDP test contains one subtest that tests the computer’s NDP functions. Subtest 01 NDP test This test checks the following functions of the coprocessor: Control word Status word...
Page 77: Expansion Test
3.14 Expansion Test To execute the expansion test, select 11 from the DIAGNOSTICS TEST MENU, press Enter and follow the directions on the screen. The expansion test contains two subtests. NOTE: To execute this subtest, the PC card wraparound connector is required. Subtest 01 PCMCIA wraparound (Internal) This test checks the following signal lines of the PC card slot:...
Page 78: Sound Test
3.15 Sound Test To execute the sound test, select 12 from the DIAGNOSTICS TEST MENU, press Enter and follow the directions on the screen. The sound test contains six subtests that test the computer’s sound functions. NOTE: To execute this subtest, the internal microphone and internal headphone (or internal speaker) are required.
Page 79 Subtest 06 Codec (Line In/Out) Load the file ESS688L.COM. Connect a sound source such as a CD player or stereo to the line-in port. Next, connect an output device such as an amplifier for the internal speaker or a radio/cassette player to the line-out port. After making the connections, a dialogue box will be displayed.
Page 80 200 times. Subtest 04 Playback Music NOTE: The Toshiba-EMI Test Disk TDY-03 cannot be used for Subtest 04. For this test, use an ordinary music CD. This subtest reads track data from a specified track and plays the sound. 3-34...
Page 81: Error Codes And Error Status Names
3.17 Error Codes and Error Status Names Table 3-2 lists the error codes and error status names for the Diagnostic Test. Table 3-2 Error codes and error status names Device name Error code Error status name (Common) Data Compare Error System ROM Checksum Error Memory...
Page 82 Table 3-2 Error codes and error status names (Continued) Device name Error code Error status name ASYNC (cont.) TX-BUFFER Full Time Out Parity Error Framing Error Overrun Error Line Status Error Modem Status Error Bad Command Error Address Mark Not Found Record Not Found HDC Not Reset Error Drive Not Initialized...
Page 83 Table 3-2 Error codes and error status names (Continued) Device name Error code Error status name CD-ROM Bad Command Illegal Length Unit Attention Media Change Request Media Detected Additional Sense Boundary Error Corrected Data Error Drive Not Ready Seek Error Time Out Reset Error Address Error...
Page 84: Hard Disk Test Detail Status
3.18 Hard Disk Test Detail Status When an error occurs in the hard disk test, the following message is displayed: HDC status = XXXXXXXX Detailed information about the hard disk test error is displayed on the screen by an eight-digit number.
Page 85 Table 3-4 Error register contents Name Description BBK1 “0” Not used (Bad block “1” A bad block mark is detected. mark) “0” There is no uncorrectable data error. (Uncorrectable) “1” Uncorrectable data error has been detected. —— Not used IDNF “0”...
Page 86: Hard Disk Format
1. If MS-DOS 6.22/Windows for Workgroups is selected, use the Master Diskette Creator (MDC) utility in the Toshiba Utility folder to back up the preinstalled software. After backing up the preinstalled software, use the BACKUP command in the Toshiba Companion Utility to back up the entire disk, including the user’s files.
Page 87 3.19.1 Function Description All track FORMAT This option performs a low-level format of all the tracks on the hard disk as shown in Table 3-5 below: NOTE: Before executing the all track format option, check for bad tracks using the Bad Track CHECK option or display a list of bad tracks on the HDD.
Page 88 NOTE: After the HDD has been formatted, execute the Toshiba MS-DOS FDISK command, to partition the HDD. Next, execute the Toshiba MS-DOS FORMAT com- mand. Refer to the Toshiba MS-DOS manual for more information about using these commands. Selecting 2 and pressing Enter in the DIAGNOSTIC MENU displays the following messages: DIAGNOSTICS - HARD DISK FORMAT : VX.XX...
Page 89 Bad track register The Bad Track register prompt will appear as shown below. Enter the cylinder and head numbers of bad tracks and press Enter. Note that if there are no bad tracks, pressing Enter alone is the same as executing All Track Format described in item (c) below.
Page 90 Bad track FORMAT To format a track as a bad track, enter the number for drive, interleave, cylinder, and head as indicated in the screen prompt shown below. Drive number select (1:#1, 2:#2) ? Interleave number (1 / 1 - 8) ? Press [Cylinder number (dddd)] ? Press [Head number (dd)] ? Press Enter to return to the Hard Disk Format menu.
Page 91: Head Cleaning
3.20 Head Cleaning 3.20.1 Function Description This function cleans the heads in the FDD by executing a series of head load/seek and read operations. A cleaning kit is necessary to perform this program. 3.20.2 Operations Selecting 4 from the DIAGNOSTIC MENU and pressing Enter displays the following messages: DIAGNOSTICS - FLOPPY DISK HEAD CLEANING : VX.XX Mount cleaning disk(s) on drive(s).
Page 92: Log Utilities
3.21 Log Utilities 3.21.1 Function Description This function logs error information generated while a test is in progress and stores the results in RAM. This function can store data on a floppy disk or output the data to a printer. If the power switch is turned off, the error information will be lost.
Page 93 The error information displayed on the screen can be manipulated by the following number keys: The 1 key scrolls the display to the next page. The 2 key scrolls the display to the previous page. The 3 key returns to the Diagnostic Menu. The 4 key erases all error log information in RAM.
Page 94: Running Test
3.22 Running Test 3.22.1 Function Description This function automatically executes the following tests in sequence: System test (subtest number 01) Memory test (subtest number 01, 02, 04, 06) Display test (subtest number 01, 03, 05) FDD test (subtest number 02) HDD test (subtest number 01, 05) Real timer test (subtest number 02) Printer test (subtest number 03) if selected...
Page 95 Selecting Yes or No and pressing Enter displays the following message: Mount the work disk(s) on the drive(s), then press [Enter] key. [Warning : The contents of the disk(s), will be destroyed.] This program is executed continuously. To terminate the program, press Ctrl + Break.
Page 96: Floppy Disk Drive Utilities
FDD and HDD. FORMAT NOTE: This program is only for testing a floppy disk drive. The option is different from the Toshiba MS-DOS FORMAT command. This program can format a 5.25-inch or 3.5-inch floppy disk in the following formats: 2D: Double-sided, double-density, 48/67.5 TPI, MFM mode, 512 bytes, 9 sectors/track.
Page 97 DIAGNOSTICS - FLOPPY DISK FORMAT : VX.XX Drive number select (1:A, 2:B) ? Select a drive number to display the following message: Type select (0:2DD-2DD,1:2D-2D,2:2D-2HD,3:2HD-2HD) ? Select a media/drive type number and press Enter. A message similar to the one below will be displayed: Warning : Disk data will be destroyed.
Page 98 Remove the source disk from the FDD, insert a formatted work disk and press any key. The [[ track, head = XXX X ]] message will appear and start copying to the target disk. When the amount of data is too large to be copied in one operation, the message from step (b) is displayed again.
Page 99: System Configuration
3.24 System Configuration 3.24.1 Function Description The System Configuration program contains the following configuration information for the computer: BIOS ROM version Boot ROM version KBC version PS microprocessor version Base memory size The number of floppy disk drives The number of ASYNC ports The number of hard disk drives The number of printer ports Extended memory size...
Page 100 3.25 SETUP 3.25.1 Function Description This program displays the current system setup information as listed below: Memory Total Base Extended Memory Shadow BIOS ROM Display Display Adapter LCD Display Mode VGA Segment Address LCD Display Colors Power On Display Text Mode Stretch Hard Disk HDD Mode Password...
Page 101: Accessing The Setup Program
3.25.2 Accessing the SETUP Program Selecting 0 from the DIAGNOSTICS MENU and pressing Enter displays the following: SYSTEM SETUP BIOS version = x.xx MEMORY I/O PORTS Total = 8192 KB Serial Port COM1(IRQ4/3F8H) Base 640 KB Infrared Port Not Used Extended = 7360 KB Parallel Port...
Page 102 If the changed item requires the system to reboot, the following message is dis- played: Are you sure? (Y/N) The changes you made will cause the system to reboot. To make other changes, press N. Repeat the steps above. To accept the changes, press Y. NOTE: You can press Esc to quit at any time without saving changes.
Page 103 Extended Displays the amount of extended memory the computer has available. You cannot change this value. Shadow BIOS ROM Displays 192 KB of RAM, which is reserved for the Shadow BIOS ROM. The value cannot be changed. Display This option configures the computer’s display. Display Adapter Displays the internal controller for the VGA internal display.
Page 104 LCD Display Colors Used to select the color palette of the internal display when the LCD mode is set to Color. TFT display 256K colors Displays 16M colors. This value cannot be changed. DSTN display 222K colors Displays 256 colors out of 226,981 colors. 4096 colors Displays 256 colors out of 4096 colors.
Page 105 Hard Disk Use this item to select the hard disk mode. Enhanced IDE Select this mode when using MS-DOS, (Normal) Windows or OS/2. (Default) Standard IDE Select this mode when using Novell NetWare or UNIX. When this mode is selected, up to 504MB is logically available even though the disk’s capacity is larger than 504MB.
Page 106 Password This option allows you to set or reset the user password for power on and instant security. Registered The user password has been registered. Not registered The user password has not been registered. For details on setting the user password refer to your computer User’s Manual. I/O ports This option controls settings for serial and parallel ports and the sound system.
Page 107 Parallel Port This option sets the address for the parallel port. The options are: LPT1 (378h) Sets the address to 378h. (Default) LPT2 (278h) Sets the address to 278h. LPT3 (3BCh) Sets the address to 3BCh. Not used Disables the port. When you select one of the above options, except for Not used, a subwindow similar to the one below appears to let you set the parallel port mode.
Page 108 Interrupt level This option sets the interrupt level for the sound system. The available settings are: IRQ5, IRQ7, IRQ9, IRQ10 (Default) NOTE: Sound Blaster compatible software uses IRQ7 as the default. If you use this software, change the software setting to IRQ10. If you cannot change the software setting, change the hardware setting to IRQ7.
Page 109 Full Power The following shows full power settings. BATTERY SAVE OPTIONS Processing Speed High CPU Sleep Mode Disabled Display Auto Off Disabled (420CDS) 30 Min. (420CDT) HDD Auto Off 30 Min. System Auto Off Disabled LCD Brightness Bright Cooling Method Performance Low Power The following shows low power settings.
Page 110 Processing Speed This feature changes the CPU processing speed. High CPU operates at 100 MHz. (Default) CPU operates at half speed. CPU Sleep Mode Use this option to enable or disable the CPU sleep function. Enabled Enables sleep mode. Disabled Disables sleep mode.
Page 111 LCD Brightness Use this option to set the level of LCD brightness. Bright Full brightness for maximum visibility. Semi-Bright Less than full brightness for saving power. Cooling method Performance If the CPU becomes too hot, the fan is turned on automatically.
Page 112 Panel Power On/Off Allows you to automatically turn your computer on or off by opening or closing the display panel. If this feature is enabled when the computer is in Resume mode, the system is automatically powered off when the display panel is closed and powered on when the panel is opened.
Page 113 Int. Keyboard layout Lets you select the arrangement of the Caps Lock, Ctrl, and Alt keys according to the following illustrations: Ext. Keyboard Fn key equivalent Use this option to set a key combination on an external keyboard to emulate the Fn key on the computer’s internal keyboard.
Page 114 Boot Priority Use this option to select the disk drive priority for boot up. FDD → HDD The computer looks for bootable files first on the FDD and next on the HDD. (Default) HDD → FDD The computer looks for bootable files first on the HDD and next on the FDD.
Page 115 General This section explains how to disassemble the computer and replace Field Replaceable Units (FRUs). It may not be necessary to remove all the FRUs in order to replace one. The chart below is a guide to which FRUs need to be removed in order to remove others. Always start by removing the battery pack, then follow the lines on the chart to determine which FRU you must remove next in order to repair the one you think is causing the computer to operate improperly.
Page 116 DANGER: 1. Always use the lithium ion battery pack or backup battery that is authorized by Toshiba or compatible with the unit. Since other battery packs have different specifications, they may be incompatible with the unit, and may burst or explode. Heating or disassembling the battery pack could cause leakage of alkaline solution.
Page 117 Before You Begin Look over the procedures in this section before you begin disassembling the computer. Familiarize yourself with the disassembly and reassembly steps. Begin each procedure by removing the AC adapter and the battery pack as instructed in section 4.2, Battery Pack. Do not disassemble the computer unless it is operating abnormally.
Page 118 Disassembly Procedures The computer has three basic types of cable connectors: Pressure Plate Connectors Normal Pin Connectors Flexible Cable Connectors To disconnect a Pressure Plate connector, lift up the tabs on either side of the plastic pressure plate and slide the cable out of the connector. To connect the cable to a Pressure Plate connector, make sure the pressure plate is fully lifted and slide the cable into the connector.
Page 119 Tools and Equipment The use of ElectroStatic Discharge (ESD) equipment is very important for your safety and the safety of those around you. Proper use of these devices will increase the success rate of your repairs and lower the cost for damaged or destroyed parts. The following equipment is necessary to disassemble and reassemble the computer: One M2 Phillips screwdriver to remove and replace screws.
Page 120: Battery Pack
Pull back the battery latch and lift out the battery pack. Figure 4-2 Removing the battery pack NOTE: For environmental reasons, do not throw away a spent battery pack. Please return spent battery packs to your Toshiba dealer. 420 Series...
Page 121 WARNING: The battery is a lithium ion battery and should be replaced only by your dealer or by a Toshiba service representative. The battery can explode if not properly replaced, used, handled, or disposed of. Dispose of the battery as required by local ordinances or regulations.
Page 122: Optional Pc Card
Optional PC Card Removing an Optional PC Card To remove an optional PC card make sure the computer is in boot mode then follow the steps below and refer to Figure 4-4. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 123 Installing an Optional PC Card To install an optional PC card, follow the steps below and refer to Figure 4-5. NOTE: Before you install the PC card, make sure the computer is in boot mode. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 124: Optional Memory Module
Optional Memory Module Removing an Optional Memory Module To remove an optional memory module, make sure the computer is in boot mode then follow the steps below and refer to Figures 4-6 and 4-7. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 125 NOTE: Some memory modules have a plastic tab. If so, simply pull up on the tab to disengage the connectors. Installing an Optional Memory Module To install an optional memory module, make sure the computer is in boot mode then follow the steps below and refer to Figures 4-6 to 4-8.
Page 126 Floppy Disk Drive (FDD) Removing the FDD To remove the internal FDD, follow the steps below and refer to Figures 4-9 to 4-12. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, and optional memory module as described in Sections 4.2, 4.3, and 4.4.
Page 127 Remove two M2x6 screws and four M2x3 screws and take off the upper plastic cover. Figure 4-10 Removing the screws Lift off the plate and remove the lower plastic cover. Figure 4-11 Removing the plate 420 Series 4-13...
Page 128 Disconnect the flexible cable. Remove four M2x3 screws and remove the FDD from the bracket. Figure 4-12 Removing the FDD Installing the FDD To install the FDD, follow the steps below and refer to Figures 4-12 back through 4-9. Seat the FDD in the metal bracket and secure four M2x3 screws. Connect the flexible cable.
Page 129 CD-ROM Drive Removing the CD-ROM Drive To remove the CD-ROM drive, follow the steps below and refer to Figures 4-13 to 4-15. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, and optional memory module as described in Sections 4.2, 4.3, and 4.4.
Page 130 Remove four M2x3 screws and two M2.5x6 silver screws securing the drive frame to the CD-ROM drive. Figure 4-14 Removing the screws Slide the drive partially out of the case. Remove the outer cover and disconnect the cable connector. Figure 4-15 Removing the CD-ROM drive Remove the drive frame from the CD-ROM drive.
Page 131 Installing the CD-ROM Drive To install the CD-ROM drive, follow the steps below and refer to Figures 4-15 back through 4-13. Seat the inner cover and connect the cable connector. Push the CD-ROM drive fully into the drive frame. Replace the outer cover and secure it with two M2.5x6 silver screws. Secure the drive frame to the drive with four M2x3 screws.
Page 132 Hard Disk Drive (HDD) Removing the HDD To remove the HDD, follow the steps below and refer to Figures 4-16 and 4-17. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, optional memory module and FDD or CD-ROM drive as described in Sections 4.2, 4.3, 4.4, and 4.5 or 4.6.
Page 133 Remove four flat-head M3x4 screws securing the frame to the HDD and separate the HDD from the frame. Figure 4-17 Removing the HDD from the frame Installing the Hard Disk Drive To install the hard disk drive, follow the steps below and refer to Figures 4-17 and 4-16. Secure the frame to the HDD with four flat-head M3x4 screws.
Page 134 Keyboard Removing the Keyboard To remove the keyboard, follow the steps below and refer to Figures 4-18 to 4-20. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, optional memory module, FDD or CD-ROM drive, and HDD as described in Sections 4.2 through 4.7.
Page 135 Remove five M2.5x6 screws securing the metal cover and lift out the cover. Figure 4-19 Removing the metal cover Disconnect the keyboard cable from PJ13 on the system board and lift out the keyboard. Figure 4-20 Removing the keyboard 420 Series 4-21...
Page 136 Installing the Keyboard To install the keyboard, follow the steps below and refer to Figures 4-21 back through 4-18. Connect the keyboard cable to PJ13 on the system board. Make sure the pressure plate connection on the cable is secure. Fit the two tabs of the metal cover into the top cover and backup battery base (see Figure 4-21), then seat the metal cover and secure it with five M2.5x6 screws.
Page 137 Disconnect the sub-battery from PJ503 and remove the battery. WARNING: If you replace the sub-battery, be sure to use only batteries recommended by Toshiba. Installation of the wrong battery can cause the battery to explode or otherwise cause damage. Figure 4-22 Removing the sub-battery Remove two tapes and disconnect the microphone cable from PJ3 on the sound board.
Page 138 Disconnect the VGA board from system board connector PJ16. Figure 4-24 Disconnecting the VGA board Rotate the VGA board out and disconnect the VGA cables from PJ302 and PJ303 (TFT model only) on the VGA board. Figure 4-25 Disconnecting the cables from the VGA board 4-24 420 Series...
Page 139 Installing the Sub-Battery and VGA Board To install the sub-battery and VGA board, follow the steps below and refer to Figures 4-26 back through 4-22. Connect the VGA cable to PJ302 and PJ303 (TFT model only) on the VGA board. Make sure the ferrite core is seated properly. NOTE: Make sure the PJ301 connector on the VGA board and PJ16 on the system board are not dirty, if these are dirty, clean them.
Page 140 4.10 RTC Battery and Top Cover with Display Assembly Removing the RTC Battery and Top Cover with Display Assembly To remove the RTC battery and top cover with display assembly, follow the steps below and refer to Figures 4-27 to 4-29. Turn off the power to the computer.
Page 141 WARNING: If you replace the RTC battery, be sure to use only batteries recommended by Toshiba. Installation of the wrong battery can cause the battery to explode or otherwise cause damage. Figure 4-28 Removing the RTC battery Disconnect the panel close sensor cable from PJ10.
Page 142 Installing the RTC Battery and Top Cover with Display Assembly To install the RTC battery and top cover with display assembly, follow the steps below and refer to Figures 4-30 back through 4-27. Seat the top cover and display assembly and secure two latches at the back of the computer and four latches at the front.
Page 143 4.11 Sound Board and Membrane Switch Removing the Sound Board and Membrane Switch To remove the sound board and membrane switch, follow the steps below and refer to Figures 4-31 to 4-33. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 144 Disconnect the sound board power cable from PJ18 on the system board (located under left side of power supply cover - this cover is not removed until Section 4.12.) Figure 4-32 Removing the sound board Unlatch the audio jack cover on the sound board and remove it. Lift off the tape securing the membrane switch, disconnect the membrane switch cable from PJ10, and lift out the switch.
Page 145 Installing the Sound Board and Membrane Switch To install the sound board and membrane switch, follow the steps below and refer to Figures 4-33 back through 4-31. Align holes in the membrane switch with corresponding holes on the sound board. Connect its cable to PJ10, and secure it with tape. Attach the audio jack cover to the sound board.
Page 146 4.12 Speaker Removing the Speaker To remove the speaker, follow the steps below and refer to Figures 4-34 and 4-35. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, optional memory module, FDD or CD-ROM drive, HDD, keyboard, sub-battery, VGA board, RTC battery, top cover with display assembly, and sound board as described in Sections 4.2...
Page 147 Remove one M2.5x4 screw securing the speaker and its brace. Figure 4-35 Removing the speaker Installing the Speaker To install the speaker, follow the steps below and refer to Figures 4-35 and 4-34. Seat the speaker in the speaker brace and secure it with one M2.5x4 screw. Seat the speaker assembly and secure it to the computer with one M2.5x6 screw (Figure 4-34).
Page 148 4.13 AC PS Unit Removing the AC PS Unit To remove the AC PS unit, follow the steps below and refer to Figures 4-36 and 4-37. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 149 Lift the power cord socket straight up until it clears its slots and remove the AC PS unit. Figure 4-37 Removing the holder assembly and power cord socket Installing the AC PS Unit To install the AC PS unit, follow the steps below and refer to Figures 4-37 and 4-36. Seat the power cord socket with the side with markings facing up.
Page 150: Infrared Board
4.14 Infrared Board Removing the Infrared Board To remove the infrared board, follow the steps below and refer to Figure 4-38. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card, optional memory module, FDD or CD-ROM drive, HDD, keyboard, sub-battery, VGA board, RTC battery, top cover with display assembly, sound board, speaker, and AC PS unit as described...
Page 151 4.15 System Board and Fan Removing the System Board and Fan To remove the system board and fan, follow the steps below and refer to Figures 4-39 and 4-40. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 152 Disconnect the fan cable from PJ11 and remove two M2.5x6 screws. The ground plate for the CPU heat sensor will be removed with the left screw. Figure 4-40 Removing the fan Disconnect the infrared board cable from PJ17 on the system board. Installing the System Board and Fan To install the system board, follow the steps below and refer to Figures 4-40 and 4-39.
Page 153: Display Mask
4.16 Display Mask Removing the Display Mask To remove the display mask, follow the steps below and refer to Figures 4-41 and 4-42. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional PC card and optional memory module as described in Sections 4.2, 4.3, and 4.4.
Page 154 Continue releasing the mask along the sides (four latches on each side) and at the top (four latches). Figure 4-42 Removing the display mask Installing the Display Mask To install the display mask, follow the steps below and refer to Figures 4-42 and 4-41. 1.
Page 155 4.17 Fluorescent Lamp (FL) Inverter Board (TFT model) Removing the FL Inverter Board To remove the FL inverter board, follow the steps below and refer to Figure 4-43. Turn off power to the computer. Disconnect the AC power cable and all external cables connected to the computer.
Page 156 Installing the FL Inverter Board To install the FL inverter board, follow the steps below and refer to Figure 4-43. Seat the FL inverter board. Connect the FL inverter cable to CN1 and the FL cable to CN2 on the FL inverter board.
Page 157 4.18 Fluorescent Lamp (FL) Inverter Board (DSTN model) Removing the FL Inverter Board To remove the FL inverter board, follow the steps below and refer to Figure 4-44. Turn off power to the computer. Disconnect the AC power cable and all external cables connected to the computer.
Page 158 Installing the FL Inverter Board To install the FL inverter board, follow the steps below and refer to Figure 4-44. Seat the FL inverter board. Connect the FL inverter cable to CN1 and the FL cable to CN2 on the FL inverter board.
Page 159 4.19 Liquid Crystal Display (LCD) Module (TFT model) Removing the LCD Module To remove the LCD module, follow the steps below and refer to Figures 4-45 and 4-46. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 160 Carefully rotate the LCD module out of the LCD cover and lay it on the keyboard. Disconnect the flexible display cable from the display unit and disconnect four display cables from PJ2, PJ3, PJ4, and PJ5 on the flexible cable. Remove the shielded tape securing the display cables to the LCD cover.
Page 161 4.20 Liquid Crystal Display (LCD) Module (DSTN model) Removing the LCD Module To remove the LCD module, follow the steps below and refer to Figures 4-47 and 4-48. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer.
Page 162 Disconnect the flexible cable from CN-IN on the LCD module. Remove the shielded tape securing the display cables to the LCD cover. Figure 4-48 Removing the LCD module (DSTN) Installing the LCD Module To install the LCD module, follow the steps below and refer to Figures 4-48 and 4-47. Secure the display cable to the LCD cover with shielded tape.
Page 163 4.21 FL (TFT model) CAUTION: When you remove the TFT FL, be careful not to let any dust or other foreign matter contaminate the LCD panel. Any contamination can affect the performance of the unit. Removing the FL To remove the FL, follow the steps below and refer to Figures 4-49 and 4-50. Turn off the power to the computer.
Page 164 Carefully rotate the two parts of the LCD PCB out so you can access the FL. Remove the white protective tape securing the FL. Pull back the white plastic cover and remove the FL. Be sure to note how the FL is threaded.
Page 165 4.22 FL (DSTN model) CAUTION: When you remove the FL, be careful not to let any dust or other foreign matter enter the LCD panel components. Removing the FL To remove the FL, follow the steps below. Refer to Figures 4-51 and 4-52. Turn off the power to the computer.
Page 166 Lift the FL module out of the frame. Lift the end of the reflector sheet covering the white FL cable and lift out the FL. Be careful not to pull or apply tension to the reflector sheet. Figure 4-52 Removing the FL (DSTN) Installing the FL To install the FL, follow the steps below and refer to Figures 4-52 and 4-51.
Page 167 4.23 Microphone Removing the microphone To remove the microphone, follow the steps below and refer to Figure 4-53. Turn off the power to the computer. Disconnect the AC power cord and all external cables connected to the computer. Remove the battery pack, optional memory module, optional PC card, FDD or CD-ROM drive, HDD, keyboard, VGA board, sub-battery, RTC battery, top cover with display assembly, display mask, FL inverter board, LCD module, and FL as described in Sections 4.2 through 4.22.
Page 168: Appendix A Handling The Lcd Module
Appendix A Handling the LCD Module Precautions for Handling the LCD Module The LCD module can be easily damaged during assembly or disassembly. Observe the following precautions when handling the LCD module. When installing the LCD module in the LCD cover, be sure to seat it so that it is properly aligned and maximum visibility of the display is maintained.
Page 169 If the panel’s surface gets dirty, wipe it with cotton or a soft cloth. If it is still dirty, try breathing on the surface to create a light condensate and wipe it again. If the surface is very dirty, we recommend a CRT cleaning agent. Apply the agent to a cloth and then wipe the panel’s surface.
Page 170 CMOS-LSI circuits are used in the module, so guard against damage from electro- static discharge. Be sure to wear a wrist or ankle ground when handling the module. Do not expose the module to direct sunlight or strong ultraviolet rays for long periods.
Page 171 Do not disassemble the LCD module. Disassembly can cause malfunctions. If you transport the module, do not use packing material that contains epoxy resin (amine) or silicon glue (alcohol or oxime). These materials can release gas that can damage the panel's polarization. 420 Series...
Page 172 Appendix B Board Layout System Board Front View Figure B-1 Board layout (front) 420 Series...
Page 173 System Board Back View Figure B-2 Board layout (back) 420 Series...
Page 174 Table B-1 System board ICs and connectors (front) Mark Number Name System Clock IC11 RTC Controller IC14 BIOS ROM IC20 Keyboard Controller IC24 IPS Controller Ni-Mh RTC Battery Connector FDD/CD-ROM I/F Connector Ext. FDD Connector Sound HDD Connector ASYNC I/F Connector P-REP Connector PJ10 Panel Close Sensor Connector...
Page 175: Appendix C Pin Assignments
Appendix C Pin Assignments PJ1 Thermistor Connector (3-pin) Table C-1 Thermistor connector pin assignments (3-pin) Pin No. Signal Name Pin No. Signal Name ACPUTH PJ2 Expansion Memory Connector (140-pin) Table C-2 Expansion memory connector pin assignments (140-pin) Pin No. Signal Name Pin No.
Page 176 Table C-2 Expansion memory connector pin assignments (140-pin) (continued) Pin No. Signal Name Pin No. Signal Name HD02;100 HD06;100 HD03;100 HD07;100 HD08;100 HD12;100 HD09;100 HD13;100 HD10;100 HD14;100 HD11;100 HD15;100 HD48;100 HD52;100 HD49;100 HD53;100 HD50;100 HD54;100 HD51;100 HD55;100 HD56;100 HD60;100 HD57;100 HD61;100 HD58;100 HD62;100...
Page 177 Table C-2 Expansion memory connector pin assignments (140-pin) (continued) Pin No. Signal Name Pin No. Signal Name EMA00;101 EMA01;101 MA02;101 MA03;101 MA04;101 MA05;101 MA06;101 MA07;101 MA09;101 MA08;101 MA11;101 MA10;101 PJ3 Ni-Mh RTC Battery Connector (3-pin) Table C-3 Ni-Mh RTC battery connector pin assignments (3-pin) Pin No.
Page 178 PJ5 FDD/CD-ROM Connector (80-pin) Table C-5 FDD/CD-ROM connector pin assignments (80-pin) Pin No. Signal Name Pin No. Signal Name RESET;000 IFSSEL;000 IFTRK0;000 SD08;100 SD07;100 SD09;100 SD06;100 IFWEN;000 SD10;100 SD05;100 SD11;100 SD04;100 IFSTEP;000 SD12;100 SD03;100 SD13;100 SD02;100 IFDIRC;000 SD14;100 420 Series...
Page 179 Table C-5 FDD/CD-ROM connector pin assignments (80-pin) (continued) Pin No. Signal Name Pin No. Signal Name SD01;100 SD15;100 SD00;100 IFAMON;000 DRQ7;100 FIOWR;000 FIORD;000 IOCRDY;100 IFRDAT;000 DACK7;000 IRQCD;100 IOCS16;000 SA01;100 IFWDAT;000 SA00;100 IFRADY;000 SA02;100 CDRCS0;000 IFDASL;000 CDRCS1;000 IFINDX;000 DSKCHG;000 CDOUTL MBSTS0;100 AGNDL CDRLED;000 CDOUTR...
Page 180 PJ6 Ext. FDD Connector (26-pin) Table C-6 Ext. FDD connector pin assignments (26-pin) Pin No. Signal Name Pin No. Signal Name — IFINDX;000 — IFDAS2;000 — DSKCHG;000 — IFRADY;000 IFHMED;000 IFAMO2;000 IFLOWD;000 IFDIRC;000 SLFDLD;100 IFSTEP;000 — IFWDAT;000 — IFWEN;000 — IFTRKO;000 —...
Page 181 Table C-7 Sound/HDD connector pin assignments (90-pin) (continued) Pin No. Signal Name Pin No. Signal Name SA06;100 SD01;100 SA02;100 SD02;100 SA07;100 SD03;100 SA01;100 SD04;100 SD05;100 SA08;100 SD06;100 SA00;100 SD07;100 SA09;100 PRDT1;000 SD15;100 PRDT2;000 SD14;100 SDMUTE;100 SD13;100 SPKVOL;100 SD12;100 BLAWR;000 SD11;100 SD10;100 RESET;000 SD09;100...
Page 182 PJ9 P-REP Connector (176-pin) Table C-9 P-REP connector pin assignments (176-pin) Pin No. Signal Name Pin No. Signal Name LA23;110 LA20;110 FRESET;010 SBHE;010 MERD;010 ZEROWS;010 IOCRDY;110 BUFOFF;020 PSPTON;010 DTR1;110 TXD1;010 DCD1;100 CTS1;100 SYSCLK;100 IORD;010 IFSTEP;000 IFAMO2 IFWDAT;000 IRQ7;110 IRQ9;110 IRQ12;110 ERROR;000 PE;100 ACK;000...
Page 183 Table C-9 P-REP connector pin assignments (176-pin) (continued) Pin No. Signal Name Pin No. Signal Name IRQ10;110 IRQ14;110 SELCT;100 BUSY;100 SLIN;000 AUTFD;000 PD0;100 PD2;100 PD4;100 PD6;100 PD7;100 CHSYNC;120 CVSYNC;120 P12V SA00;110 SA08;110 SA02;110 SA04;110 SA10;110 SA06;110 SA15;110 SA18;110 SA13;110 SD07;110 SA16;110 SD05;110 SD03;110...
Page 184 Table C-9 P-REP connector pin assignments (176-pin) (continued) Pin No. Signal Name Pin No. Signal Name SD02;110 SD08;110 SD10;110 SD01;110 SD12;110 SD14;110 IFTRK0;000 SLFDLD;100 IFRDAT;000 DSKCHG;000 IFWPRO;000 IFHMED;000 PRDT1;000 EXKBDT;100 EXKBCK;100 JOYR;000 JOYW;000 HVPC LOUTLM LOURLP LINLM LINLP C.10 PJ10 Panel Close Sensor Connector (2-pin) Table C-10 Panel close sensor connector pin assignments (2-pin) Pin No.
Page 185 C.13 PJ13 Keyboard Connector (25-pin) Table C-13 Keyboard connector pin assignments (25-pin) Pin No. Signal Name Pin No. Signal Name KBRT6;100 KBRT2;100 KBRT5;100 KBRT0;100 KBRT1;100 KBRT3;100 KBRT7;100 KBRT4;100 KBOT02;000 KBOT09;000 KBOT10;000 KBOT03;000 KBOT04;000 KBOT05;000 KBOT06;000 KBOT07;000 KBOT08;000 KBOT01;000 KBOT00;000 IPSY;100 –...
Page 186 C.15 PJ15 PCMCIA Connector (140-pin) Table C-15 PCMCIA connector pin assignments (140-pin) Pin No. Signal Name Pin No. Signal Name — — — — — — CDA2;000 SDB2;000 WPA;100 WPB;100 CDA10;100 CDB10;100 CDA02;100 CDB02;100 CDA09;100 CDB09;100 CDA01;100 CDB01;100 CDA08;100 CDB08;100 CDA00;100 CDB00;100 BVDA1;100...
Page 187 Table C-15 PCMCIA connector pin assignments (140-pin) (continued) Pin No. Signal Name Pin No. Signal Name MCVCCA MCVCCB CADA21;100 CADB21;100 BSYA;000 BSYB;000 CADA20;100 CADB20;100 WEA;000 WEB;000 CADA19;100 CADB19;100 CADA14;100 CADB14;100 CADA18;100 CADB15;100 CADA13;100 CADB13;100 CADA17;100 CADB17;100 CADA08;100 CADB08;100 IOWA;000 CADB09;100 CADA09;100 CADB09;100 IORA;000...
Page 188 C.16 PJ16 VGA Connectors (140-pin) Table C-16 VGA connector pin assignments (140-pin) Pin No. Signal Name Pin No. Signal Name P12V BE3;000 BE2;000 ADS;000 RDYVLI;000 FLHIGH;100 CFLPWR;000 FLV0 RDYVLO;000 CSVLBI;000 CLKVLO;100 FLV1 WR;000 RSTVGA;000 PDNVGA;000 A02;100 CLKVGA;100 A03;100 A04;100 RESET;000 A05;100 PANEL1;100 A06;100...
Page 189 Table C-16 VGA connector pin assignments (140-pin) (continued) Pin No. Signal Name Pin No. Signal Name D11;100 A22;100 D12;100 A26;100 D13;100 A25;100 A24;100 D14;100 A23;100 D15;100 D16;100 D31;100 D17;100 D30;100 D18;100 D29;100 D28;100 D19;100 D27;100 D20;100 D21;100 D26;100 D22;100 D25;100 D23;100 D24;100 Y7;100...
Page 190 C.17 PJ17 Ir-DA Board Connector (5-pin) Table C-17 Ir-DA board connector pin assignments (5-pin) Pin No. Signal Name Pin No. Signal Name SIRRX;100 SIRTX;100 — — DASKRX;100 C.18 PJ18 Sound Board Power I/F Connector (6-pin) Table C-18 Sound board power I/F connector pin assignments (6-pin) Pin No.
Page 191 Appendix D Keyboard Scan/Character Codes Table D-1 Scan codes (set 1 and set 2) Code set 1 Code set 2 Keytop Make Break Make Break Note ‘ ~ 7 & BkSp 29 (42) Caps Lock 420 Series...
Page 192 Table D-1 Scan codes (set 1 and set 2) (continued) Code set 1 Code set 2 Keytop Make Break Make Break Note ‘ “ Enter Shift (L) No.102 key , < . > Shift (R) Ctrl Alt (L) Space ALT (R) E0 F0 11 E0 F0 70 E0 F0 71...
Page 193 Table D-1 Scan codes (set 1 and set 2) (continued) Code set 1 Code set 2 Keytop Make Break Make Break Note PrintSc Pause — — — — Notes: 1* Scan codes differ by mode. 2* Scan codes differ by overlay function. 3* Combination with Fn key makes different codes.
Page 194 Table D-2 Scan codes with left Shift key Code set 1 Code set 2 Make Break Make Break E0 AA E0 52 E0 D2 E0 2A E0 F0 12 E0 70 E0 F0 70 E0 12 E0 AA E0 53 E0 D3 E0 2A E0 F0 12 E0 71 E0 F0 71 E0 12...
Page 195 Table D-5 Scan codes in overlay mode Code set 1 Code set 2 Keytop Make Break Make Break (•) (–) Table D-6 Scan codes with Ctrl key Code set 1 Code set 2 Shift Make Break Make Break Prt Sc Common E0 2A E0 37 E0 B7 E0 AA E0 12 E0 7C...
Page 196 Appendix E Key Layouts United States (US) Keyboard Figure E-1 US keyboard United Kingdom (UK) Keyboard Figure E-2 UK keyboard 420 Series...
Page 197 German (GR) Keyboard Figure E-3 GR keyboard French (FR) Keyboard Figure E-4 FR keyboard 420 Series...
Page 198 Spanish (SP) Keyboard Figure E-5 SP keyboard Italian (IT) Keyboard Figure E-6 IT keyboard 420 Series...
Page 199 Scandinavian (SC) Keyboard Figure E-7 SC keyboard Swiss-German (SL) Keyboard Figure E-8 SL keyboard 420 Series...
Page 200: Appendix F Wiring Diagrams
Appendix F Wiring Diagrams Printer Wraparound Connector (9) +PD7 (15) –ERROR (8) +PD6 (14) –AUTFD (7) +PD5 (13) +SELECT (6) +PD4 (16) –PINIT (5) +PD3 –STROBE (10) –ACK (4) +PD2 (12) (3) +PD1 (17) –SLIN (2) +PD0 (11) +BUSY Figure F-1 Printer wraparound connector RS-232-C Wraparound Connector (3) TD (7) RTS...
Page 201 RS-232-C Direct Cable (9-Pin to 25-Pin) (1) CD (2) RD (3) TD (4) DTR (22) (5) GND (7) RTS (6) DSR (20) (8) CTS (9) RI Figure F-4 RS-232-C direct cable (9-pin to 25-pin) 420 Series...

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