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Sony MDX-C7970 Service Manual

Fm/am(mw/lw) minidisc player
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MDX-C7970/C7970R
SERVICE MANUAL
For RM-X4S (Remote Commander),
please refer to RM-X4S Service Manual
(9-925-698-∏) previously issued.
MICROFILM
Photo: MDX-C7970R
Model Name Using Similar Mechanism
Base Mechanism Type
Optical Pick-Up Name
SPECIFICATIONS
FM/AM(MW/LW) MINIDISC PLAYER
US Model
Canadian Model
E Model
MDX-C7970
AEP Model
UK Model
MDX-C7970R
MDX-C7900/C7900R
MG-164N-138
KMS-241B/J1NP
– Continued on next page –

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Summary of Contents for Sony MDX-C7970

  • Page 1 MDX-C7970/C7970R SERVICE MANUAL US Model Canadian Model E Model MDX-C7970 AEP Model UK Model MDX-C7970R For RM-X4S (Remote Commander), please refer to RM-X4S Service Manual Photo: MDX-C7970R (9-925-698-∏) previously issued. Model Name Using Similar Mechanism MDX-C7900/C7900R Base Mechanism Type MG-164N-138...
  • Page 2 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground The components identified by mark ! or dotted Les composants identifiés par une marque ! sont under no-signal conditions. line with mark ! are critical for safety. critiques pour la sécurité. Ne les remplacer que no mark : MD PLAY 4-8.
  • Page 3 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : MD PLAY ∗ : Impossible to measure 4-9. SCHEMATIC DIAGRAM – SERVO Board (2/3) – • See page 67 for Waveforms. • See page 62 for IC Block Diagrams.
  • Page 4 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : MD PLAY ∗ 4-10. SCHEMATIC DIAGRAM – SERVO Board (3/3) – • See page 67 for Waveform. : Impossible to measure (Page 47) (Page 40) –...
  • Page 5 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ) : AM (MW) 4-13. SCHEMATIC DIAGRAM – MAIN Board (1/4) – • See page 67 for Waveforms. • See page 65 for IC Block Diagrams.
  • Page 6 MDX-C7970/C7970R • Voltages are dc with respect to ground under no-signal (detuned) conditions. 4-14. SCHEMATIC DIAGRAM – MAIN Board (2/4) – no mark : FM (Page 48) (Page 54) – 49 – – 50 –...
  • Page 7 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ) : AM (MW) 4-15. SCHEMATIC DIAGRAM – MAIN Board (3/4) – • See page 67 for Waveforms. • See page 65 for IC Block Diagrams.
  • Page 8 MDX-C7970/C7970R • Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ) : AM (MW) ] : LW 4-16. SCHEMATIC DIAGRAM – MAIN Board (4/4) – • See page 66 for IC Block Diagrams.
  • Page 9 MDX-C7970/C7970R • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM 4-18. SCHEMATIC DIAGRAM – DISPLAY Board – • See page 68 for Waveform. (Page – 57 – – 58 –...
  • Page 10 MDX-C7970/C7970R 4-20. SCHEMATIC DIAGRAM – SUB Board – (Page 54) (Page 57) – 61 –...
  • Page 11 • IC Block Diagrams – SERVO Board – IC101 PCM1718E/2K 20 XTO CONTROL 19 CLKO DGND INPUT INTERFACE 18 MUTE MODE CONTROL DIGITAL LRCIN 17 DM1 FILTER 16 DM0 NOISE SHAPER BCKIN 15 RSTB 5 LEVEL 5 LEVEL ZERO 14 FORMAT D/C_R 13 D/C_L LOWPASS...
  • Page 12 IC302 CXA2523R 43 42 USROP – RF AGC – USRC RFA1 BPF3T RFA2 PEAK3T – HLPT –1 – – –2 – CFST PTGR TEMP PEAK – –2 – BOTTOM 36 BOTM – –1 GRVA 35 ABCD 34 FE 33 AUX –...
  • Page 13 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 MN41V4400TT-08S CLOCK OSC XRAS XCAS A0–A9 COLUMN DECODER SENSE REFRESH AMP INPUT/OUTPUT CONTROL SWITCH A0–A9 MEMORY CELL (4194204 BIT) –...

  • Page 14: Main Board

    – MAIN Board – IC100 TDA7427AD SUPPLY & POWER ON RESET 11 BIT SWITCH PROGRAMMABLE SWM/DIR COUNTER COUNTER FM/AM SWITCH 5 BIT SWITCH PROGRAMMABLE SWM/DIR COUNTER CONTROL TIMER SWITCH 11 – 21 BIT 16 BIT 14 BIT FM/AM PROGRAMMABLE PROGRAMMABLE PROGRAMMABLE SWITCH COUNTER...
  • Page 15 IC300 TDA7462D013TR SE3L SE3R MUTE PAUSE PAUSE DETECT FRONT INPUT TREBLE/ OUT FL VOICE BANDPASS LOUDNESS VOLUME FADER GAIN & SOFT BASS CONTROL SE1L CONTROL AUTO MUTE CONTROL CIRCUIT CIRCUIT SE1R ZERO CIRCUIT FRONT MD– OUT FR FADER CDL+ CDL– COMPANDER CDR–...

  • Page 16: Servo Board

    • Waveforms – SERVO Board – – MAIN Board – 1 IC302 @§ (TE) (MD PLAY Mode) 6 IC501 #¡ (EXTAL) (MD PLAY Mode) 1 IC100 9 (OSC IN) (FM/AM (MW) Mode) Approx. 2.7 Vp-p 2.7 Vp-p 0.5 Vp-p 0.1 µ s 94 ns 2 IC302 #¢...
  • Page 17 – KEY Board – 6 IC700 (£ (X1) 1 IC801 @º (OSC IN) 5.8 Vp-p 2.8 Vp-p 3.5 µ s 271 ns – 68 –...

  • Page 18: Ic Pin Function Description

    4-21. 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 19 Pin No. Pin Name Function Two-way data bus with the D-RAM (IC307) MVCI Digital in PLL oscillation input from the external VCO Not used (fixed at “L”) ASYO Playback EFM full-swing output terminal ASYI I (A) Playback EFM asymmetry comparator voltage input terminal AVDD —...
  • Page 20 Pin No. Pin Name Function SFDR Sled servo drive PWM signal (+) output to the BH6511FS (IC303) SPRD Spindle servo drive PWM signal (–) output to the BH6511FS (IC303) SPFD Spindle servo drive PWM signal (+) output to the BH6511FS (IC303) FGIN Not used (fixed at “L”) TEST1...
  • Page 21 • 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 22 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 “L”: link on, “H”: link off – 73 –...
  • Page 23 Pin Name Function UNIREQ Data request signal output terminal (for SONY bus) “H”: request on Not used (open) Serial clock signal input from the master controller (IC700) or serial clock signal output to the UNICKIO SONY bus interface (IC600) and master controller (IC700) (for SONY bus)
  • Page 24 Serial data output to the SONY bus interface (IC600) Serial clock signal output to the MD mechanism controller (IC501) and SONY bus interface UNI CKIO (IC600) or serial clock signal input from the MD mechanism controller (IC501) (for SONY bus) Not used (open) SIRCS...
  • Page 25 (LSW533 DSPL: MDX-C7970R only) Key input terminal (A/D input) (LSW890, LSW512 to LSW521) KEY-IN1 6, AF/TA (MDX-C7970R) LIST (MDX-C7970), LIST PTY (MDX-C7970R) DSPL (MDX- C7970), 10 to 3 keys input KEY-IN2 Key input terminal (A/D input) Not used (fixed at “L”)
  • Page 26 Pin No. Pin Name Function Sub system clock input terminal (32.768 kHz) Not used (open) Battery detect signal input from the SONY bus interface (IC600) and battery detect circuit BU-IN “L” is input at low voltage 77, 78 Not used (open)
  • Page 27 Pin No. Pin Name Function FM system power supply on/off control signal output to the BA3918 (IC800) FM-ON “L”: AM power on, “H”: FM power on Tuner system power supply on/off control signal output to the BA3918 (IC800) TU-ON “H”: tuner power on Not used (open) 112 to 118 —...

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