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Sony MDX-C7900 Service Manual
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Sony MDX-C7900 Service Manual

Fm/am minidisc player fm/mw/lw minidisc player
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MDX-C7900/C7900R
SERVICE MANUAL
Ver 1.1 2001.08
Refer to RM-X4S Service Manual (9-925-
698-
) issued previously for information
[][]
of remote commander (RM-X4S) supplied
with this set.
Sony Corporation
9-925-787-12
2001H0500-1
e Vehicle Company
C 2001.8
Shinagawa Tec Service Manual Production Group
Photo: MDX-C7900
Model Name Using Similar Mechanism
Base Mechanism Type
Optical Pick-Up Name
SPECIFICATIONS
FM/AM MINIDISC PLAYER
FM/MW/LW MINIDISC PLAYER
US Model
Canadian Model
E Model
MDX-C7900
AEP Model
UK Model
MDX-C7900R
NEW
MG-164KT-138
KMS-241A/J2N
– Continued on next page –
MDX-C7900
MDX-C7900R

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  • Page 1 UK Model MDX-C7900R Refer to RM-X4S Service Manual (9-925- 698- ) issued previously for information [][] of remote commander (RM-X4S) supplied Photo: MDX-C7900 with this set. Model Name Using Similar Mechanism Base Mechanism Type MG-164KT-138 Optical Pick-Up Name KMS-241A/J2N SPECIFICATIONS –...

  • Page 2: Table Of Contents

    Ver 1.1 TABLE OF CONTENTS SERVICE NOTE ............3 GENERAL Location of Controls (MDX-C7900) ......4 Location of Controls (MDX-C7900R) ......5 Resetting the Unit ............6 Detaching the Front Panel ..........6 Preparing the Rotary Commander ........6 Setting the Clock ............. 6 Installation (US, Canadian) ..........

  • Page 3: Service Note

    SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

  • Page 4: General

    SECTION 2 This section is extracted from instruction manual. GENERAL – 4 –...
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  • Page 13 SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. FRONT PANEL Push the button (release). Remove the front panel of the arrow. COVER ASS’Y, PANEL (SUB) ASS’Y 2 cover ass’y 4 panel (sub) ass’y 3 four screws (PTT2.6 3 screw (PTT2.6...
  • Page 14 MECHANISM DECK (MG-164KT-138) 1 two screws (PTT2.6 2 mechanism deck (MG-164KT-138) MAIN BOARD 1 eight screws (PTT2.6 3 three screws (PTT2.6 6) (ground point) 1 two screws (PTT2.6 2 heat sink 4 main board 5 insulating sheet – 14 –...
  • Page 15 SERVO BOARD 3 two screws (BVTT2 3 two screws (BVTT2 4 servo board 2 flexible board 1 sensor flexible board (CN103) (CN102) FLOAT BLOCK 5 Pushing an arrw A part, raise the float block up ward at the 1 four screws 2 MD cover ass’y front to release a lock.
  • Page 16 HOLDER ASS’Y 5 holder ass’y 4 washer (M) 1 spring (CHKG) 2 stop ring E (1.5) 3 lever (lock R) 1 spring (CHKG) 3 lever (lock L) 2 stop ring E (1.5) OPTICAL PICK-UP (KMS-241A/J2N) 4 screw 6 bearing (SL) 5 feed screw ass’y 7 optical pick-up (KMS-241A/J2N)
  • Page 17 MOTOR ASS’Y (M901, M902, M903), SENSOR BOARD 4 screw (P1.7 1.8) 9 two screws (P1.7 1.8) 5 bracket (SL) 2 two screws 0 motor ass’y 6 motor ass’y (M901) (M902) 3 sensor board 7 screw 8 base (SL) !™ motor ass’y (M903) !¡...

  • Page 18: Connections

    (J1) R-CH L-CH Adjust RV4 on TU1 0.01 F for minimum reading. R-CH R-CH Carrier frequency: 97.9 MHz (MDX-C7900) L-CH R-CH Adjust RV4 on TU1 98.0 MHz (MDX-C7900R) Output level : 22 dB (12.6 V) for minimum reading.
  • Page 19 2. Push the button and set to FM. 4. Adjust RV1 on MAIN board so that the display indication is RV4 FM STEREO SEPARATION Adjustment [MODE] 3. Push the button and set to AM (MDX-C7900) or MW “15.8”. (MDX-C7900R). Display Display SHUF SHUF Specification: Display indication : 15.6 to 16.4...

  • Page 20: Diagrams

    SECTION 5 MDX-C7900/C7900R DIAGRAMS 5-1. BLOCK DIAGRAM – SERVO Section – IC301 (1/2) • SIGNAL PATH EFMO ADDT : MD PLAY FILI DIGITAL SIGNAL PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, CLTV SAMPLING ATRAC ENCODER/DECODER, 2M BIT D-RAM FILO IC301 (1/2)

  • Page 21: Block Diagram - Main Section

    MDX-C7900/C7900R 5-2. BLOCK DIAGRAM – MAIN Section – DIGITAL FILTER, DIGITAL D-BASS CONTROL D/A CONVERTER IC201 IC202 • SIGNAL PATH DADT DOUT DATA VOUTL LOW-PASS LEVEL INPUT DIGITAL OUTPUT : MD PLAY BCKI FILTER BCKO INPUT DIGITAL NOISE SHIFT INTERFACE...

  • Page 22: Block Diagram - Display/Key Control Section

    MDX-C7900/C7900R 5-3. BLOCK DIAGRAM – DISPLAY/KEY CONTROL Section – EN801 VOLUME/BASS/TREBLE/ (LSW813: AEP, UK model only) BALANCE/FADER CONTROL D900 LSW801 – 804, LSW805 LSW806 – 821 D-BASS ROTARY ENCODER EN801 J900 (REMOTE IN) CNP801 D912 FRONT PANEL SIDE BUZZER KEY ACTIVE...

  • Page 23: Block Diagram - Bus Control/Power Supply Section

    RESET SIGNAL BACKUP +5V GENERATOR RESET ANT REM IC801 AMP REM REGULATOR (FM/AM PLL (IC100) B+) S900 CNJ600 (RESET) D702 SONY BUS INTERFACE BUS CONTROL IN ANP+B IC600 REGULATOR AMT+B (FOR SONY BUS) (FOR VT) REGULATOR RAM RESET RESET IC800 RESET...

  • Page 24: Printed Wiring Boards - Mechanism Deck Section

    MDX-C7900/C7900R 5-5. PRINTED WIRING BOARDS – MECHANISM DECK Section – • Semiconductor Location Ref. No. Location D401 D501 IC301 IC302 IC303 IC304 IC305 IC306 IC307 IC401 IC501 IC502 IC503 Q301 Q302 Q401 Q402 Q403 Note on Printed Wiring Boards: •...

  • Page 25: Schematic Diagram - Mechanism Deck Section

    MDX-C7900/C7900R Note on Schematic Diagram: • U : B+ Line. • All capacitors are in F unless otherwise noted. pF: • Power voltage is dc 14.4V and fed with regulated dc power 50 WV or less are not indicated except for electrolytics supply from ACC and BATT cords.

  • Page 26: Schematic Diagram - Main Section

    MDX-C7900/C7900R Note on Schematic Diagram: • Voltages are taken with a VOM (Input impedance 10 M ). • All capacitors are in F unless otherwise noted. pF: Voltage variations may be noted due to normal produc- 50 WV or less are not indicated except for electrolytics tion tolerances.

  • Page 27: Printed Wiring Board – Main Section

    MDX-C7900/C7900R • Semiconductor Location 5-8. PRINTED WIRING BOARD – MAIN Section – • See page 3 for Type A/Type B Discrimination. • Semiconductor (Component Side) Location (Conductor Side) Ref. No. Location Ref. No. Location F-11 IC204 Ref. No. Location H-12...

  • Page 28: Printed Wiring Board – Panel Section

    MDX-C7900/C7900R 5-10. SCHEMATIC DIAGRAM – PANEL Section – • See page 46 for Waveform. • Semiconductor 5-9. PRINTED WIRING BOARD – PANEL Section – Location (Component Side) Ref. No. Location D811 D812 D813 D814 D815 D816 D817 A-11 IC801 Q806 Q807 •...
  • Page 29 • IC Block Diagrams – SERVO Board – IC301 CXD2652AR 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 AUX2 SPINDLE GENERATOR SERVO 74 TE MNT0 73 SE...
  • Page 30 IC302 CXA2523R 43 42 USROP – RF AGC – USRC RFA1 BPF3T RFA2 PEAK3T – HLPT –1 – – –2 – CFST PTGR TEMP PEAK – –2 – 36 BOTM BOTTOM – –1 – GRVA 35 ABCD 34 FE 33 AUX –...
  • Page 31 IC303 BH6511FS-E2 INTERFACE INTERFACE CHARGE PREDRIVE PREDRIVE PUMP. PREDRIVE PREDRIVE INTERFACE INTERFACE IC305 BA6287F OUT1 OUT2 DRIVER DRIVER VREF CONTROL LOGIC POWER SAVE IC307 MSM51V4400-70TS-K CLOCK OSC XRAS XCAS A0–A9 COLUMN DECODER SENSE REFRESH AMP INPUT/OUTPUT CONTROL SWITCH A0–A9 MEMORY CELL (4194204 BIT) –...

  • Page 32: Main Board

    – MAIN Board – IC100 BU2624FV-E2 XOUT PHASE REFERENCE DIVIDER FMIN MAIN PRESCALER COUNT SHIFT REGISTER LATCH AMIN IF COUNT 20BIT COUNT IFIN IC102 SAA6588T-118 (MDX-C7900R) POWER SUPPLY PAUSE DETECTOR & RESET MULTI PATH 57kHz DETECTOR 8th ORDER BAND-PASS FILTER CLOCKED SIGNAL QUALITY COMPARATOR...
  • Page 33 IC200 TC9246F-TP1 IC201 SM5852FS-E2 LRCI DB/DS INPUT BCKI MOD2 INTERFACE DIGITAL MOD1 SIGNAL LOCK PROCESSOR SYSTEM CLOCK VDDA LRCO SEQUENTIAL RSTN OUTPUT AMPI CONTROL BCKO INTERFACE TESTN DOUT MUTE MUTEN CONTROL AMPO MODE CONTROL VSSA SELECTOR IC202 PCM1717E-ST2 IC250 NJM2360AM (TE2) CLKO DGND CONTROL...
  • Page 34 IC300 LC75374E LFIN – LFOUT – – – – LSELO LROUT – – – VREF CONTROL – – SHIFT – DECODER LATCH REGISTER RROUT RSELO – – – – RFOUT – RFIN 6 7 8 9 10 IC800 BA3918-V3 REGULATOR OVER VOLTAGE PROTECT –...
  • Page 35 • Waveforms – MECHANISM DECK Section – 1 IC302 wh (TE) (PLAY MODE) 6 IC501 ea (EXTAL) (PLAY MODE) 3 IC201 1 (LRCL) (PLAY MODE) 5.1 Vp-p 0.5 Vp-p 2.7 Vp-p 0.1 s 23 s 2 IC302 ef (FE) (PLAY MODE) 7 IC304 3 (IN) (PLAY MODE) 4 IC201 2 (BCKI) (PLAY MODE) 0.3 Vp-p...
  • Page 36 – PANEL Section – 8 IC102 5 (OSCI) (FM MODE) 1 IC801 w; (OSC IN) 3.8 Vp-p 2.1 Vp-p 230 ns 5.2 s 9 IC100 1 (XI) (RADIO MODE) 1.8 Vp-p 139 ns 0 IC700 od (X1) 5.6 Vp-p 272 ns qa IC700 ud (X1A) 5 Vp-p 31 s...

  • Page 37: Ic Pin Function Description

    5-11. IC PIN FUNCTION DESCRIPTION SERVO BOARD IC301 CXD2652AR (DIGITAL SIGNAL PROCESSOR, DIGITAL SERVO PROCESSOR, EFM/ACIRC ENCODER/DECODER, SHOCK PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER, 2M BIT D-RAM) Pin No. Pin Name Function Focus OK signal output to the MD mechanism controller (IC501) MNT0 “H”...
  • Page 38 Pin No. Pin Name Function DVSS — Ground terminal (digital system) Output enable signal output to the D-RAM (IC307) “L” active XCAS Column address strobe signal output to the D-RAM (IC307) “L” active Address signal output to the external D-RAM Not used (open) XRAS Row address strobe signal output to the D-RAM (IC307) “L”...
  • Page 39 Pin No. Pin Name Function DVDD — Power supply terminal (+3.3V) (digital system) FFDR Focus servo drive PWM signal (+) output to the BH6511FS (IC303) FRDR Focus servo drive PWM signal (–) output to the BH6511FS (IC303) Clock signal (176.4 kHz) output terminal (X’tal system) Not used (open) SRDR Sled servo drive PWM signal (–) output to the BH6511FS (IC303) SFDR...
  • Page 40 SERVO BOARD IC302 CXA2523R (RF AMP, FOCUS/TRACKING ERROR AMP) Pin No. Pin Name Function I-V converted RF signal I input from the optical pick-up block detector I-V converted RF signal J input from the optical pick-up block detector Middle point voltage (+1.65V) generation output terminal 4 to 9 A to F Signal input from the optical pick-up detector...
  • Page 41 Two way data bus with the external EEPROM device Not used (open) MD-SO Writing serial data signal output to the CXD2652AR (IC301) and CXA2523R (IC302) LINKOFF Unilink on/off control signal output for the SONY bus “H”: link off, “L”: link on – 59 –...
  • Page 42 Pin No. Pin Name Function UNIREQ Data request signal output terminal (for SONY bus) “H”: request on Not used (open) UNCKI Serial data transfer clock signal input from the master controller (IC700) (for SONY bus) UNISI Serial data input from the SONY bus interface (IC600)
  • Page 43 Serial data input from the SONY bus interface (IC600) UNI SO Serial data output to the SONY bus interface (IC600) Serial data transfer clock signal output to the MD mechanism controller (IC501) and SONY bus UNI CKO interface (IC600) 23 to 25...
  • Page 44 Pin Name Function Key input terminal (A/D input) MDX-C7900: Z, LIST, DSPL, 10, 9, 8, 7, 6, 5 keys input (LSW812 and LSW814 to LSW821) KEY IN1 MDX-C7900R: Z, DSPL, LIST PTY, AF/TA, 10, 9, 8, 7, 6, 5 keys input...
  • Page 45 Pin No. Pin Name Function PLL CE PLL serial chip enable output to the FM/AM PLL (IC100) HSTX Hardware standby input terminal Not used (open) Mode selection input terminal (fixed at “L”) Mode selection input terminal (fixed at “H”) Mode selection input terminal (fixed at “H”) System reset signal input from the reset signal generator (IC801) and reset switch (S900) RESET “L”...

  • Page 46: Exploded Views

    SECTION 6 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 47 Ver 1.1 (2) FRONT PANEL SECTION not suplied (KEY board) LCD801 C7900 C7900R Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-023-611-01 BUTTON (10KEY) 3-023-618-01 PLATE (L), LIGHT GUIDE (OFF. SHIFT. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10) 3-023-619-01 PLATE (R), LIGHT GUIDE X-3375-315-1 PANEL ASSY, FRONT (C7900) * 63...
  • Page 48 (3) MECHANISM DECK SECTION-1 (MG-164KT-138) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 101 A-3313-612-A SERVO BOARD, COMPLE * 110 3-919-280-01 LEVER (LOCK R) * 102 X-3369-440-1 CHASSIS ASSY, MD 3-919-281-01 SPRING (CHKG) 3-919-296-01 SPRING (FL), TENSION * 112 X-3369-441-1 COVER ASSY, MD 3-921-111-01 SPRING (FL2), TENSION...
  • Page 49 (4) MECHANISM DECK SECTION-2 (MG-164KT-138) 168 167 M903 M901 M902 The components identified by Les composants identifiés par une mark 0 or dotted line with marque 0 sont critiques pour la mark 0 are critical for safety. sécurité. Replace only with part num- Ne les remplacer que par une pièce ber specified.

  • Page 50: Electrical Parts List

    SECTION 7 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark 0 or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.
  • Page 51 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < TRANSISTOR > R852 1-216-081-00 METAL CHIP 1/10W Q801 8-729-424-08 TRANSISTOR UN2111 R853 1-216-069-00 METAL CHIP 6.8K 1/10W Q802 8-729-424-08 TRANSISTOR UN2111 R854 1-216-061-00 METAL CHIP 3.3K 1/10W Q803 8-729-904-78 TRANSISTOR DTD113ZK...
  • Page 52 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-164-161-11 CERAMIC CHIP 0.0022uF 10% 100V 1-164-004-11 CERAMIC CHIP 0.1uF (C7900R) (C7900R) 1-164-232-11 CERAMIC CHIP 0.01uF C100 1-115-866-11 ELECT 4.7uF (C7900R) C101 1-115-866-11 ELECT 4.7uF 1-115-340-11 CERAMIC CHIP 0.22uF C103 1-115-866-11 ELECT...
  • Page 53 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C313 1-126-382-11 ELECT 100uF 6.3V C801 1-128-428-11 ELECT 10uF C314 1-115-866-11 ELECT 4.7uF C802 1-128-428-11 ELECT 10uF C803 1-128-428-11 ELECT 10uF C315 1-115-866-11 ELECT 4.7uF C804 1-128-428-11 ELECT 10uF C316 1-163-251-11 CERAMIC CHIP...
  • Page 54 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D507 8-719-053-18 DIODE 1SR154-400TE-25 J900 1-566-822-41 JACK (REMOTE IN) D508 8-719-053-18 DIODE 1SR154-400TE-25 < COIL > D509 8-719-053-18 DIODE 1SR154-400TE-25 D510 8-719-053-18 DIODE 1SR154-400TE-25 1-412-951-11 INDUCTOR CHIP 10uH D600 8-719-057-80 DIODE MA8160-M-TX 1-216-296-00 SHORT...
  • Page 55 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q991 8-729-920-21 TRANSISTOR DTC314TKH04 R104 1-216-081-00 METAL CHIP 1/10W Q992 8-729-920-21 TRANSISTOR DTC314TKH04 (C7900: E/C7900R) R105 1-216-077-00 METAL CHIP 1/10W Q993 8-729-424-08 TRANSISTOR UN2111 (C7900: US, Canadian) R105 1-216-081-00 METAL CHIP 1/10W...
  • Page 56 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R306 1-216-081-00 METAL CHIP 1/10W R729 1-216-025-00 RES, CHIP 1/10W R730 1-216-025-00 RES, CHIP 1/10W R307 1-216-033-00 METAL CHIP 1/10W R731 1-216-025-00 RES, CHIP 1/10W R308 1-216-065-00 METAL CHIP 4.7K 1/10W R732...
  • Page 57 MAIN SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R901 1-216-089-00 RES, CHIP 1/10W X701 1-579-886-21 VIBRATOR, CRYSTAL (32kHz) R902 1-216-089-00 RES, CHIP 1/10W ************************************************************ R903 1-216-675-11 METAL CHIP 0.5% 1/10W R904 1-216-675-11 METAL CHIP 0.5% 1/10W A-3313-612-A SERVO BOARD, COMPLETE...
  • Page 58 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C359 1-162-923-11 CERAMIC CHIP 47PF Q402 8-729-106-60 TRANSISTOR 2SB1115A C361 1-135-259-11 TANTAL. CHIP 10uF 6.3V Q403 8-729-421-22 TRANSISTOR UN2211 C362 1-107-826-11 CERAMIC CHIP 0.1uF C402 1-162-970-11 CERAMIC CHIP 0.01uF <...
  • Page 59 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R501 1-216-821-11 METAL CHIP 1/16W M901 A-3301-407-A MOTOR ASSY, SP (SPINDLE) M902 A-3291-190-A MOTOR ASSY, SL (SLED) R502 1-216-821-11 METAL CHIP 1/16W M903 A-3291-191-A MOTOR ASSY, LO (LOADING) R503 1-216-821-11 METAL CHIP 1/16W...
  • Page 60 MDX-C7900/C7900R Ref. No. Part No. Description Remark 1-776-207-71 CORD (WITH CONNECTOR) (POWER) (C7900) 3-934-325-01 SCREW, +K (5X8) TAPPING (C7900) 1-776-527-71 CORD (WITH CONNECTOR) (ISO) (POWER) (C7900R) 1-465-459-21 ADAPTER, ANTENNA (C7900R) – 78 –...
  • Page 61 MDX-C7900/C7900R MEMO – 79 –...
  • Page 62 MDX-C7900/C7900R REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2001.08...

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