Denon DRR-M31 Service Manual
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Denon DRR-M31 Service Manual

Stereo cassette deck
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For Europe model
SERVICE MANUAL
DRR-M31
MODEL
STEREO CASSETTE DECK
Some illustrations using in this service manual are slightly different from the actual set.
16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321
X0166V.02 DE/CDM 0302

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  • Page 1 For Europe model SERVICE MANUAL DRR-M31 MODEL STEREO CASSETTE DECK Some illustrations using in this service manual are slightly different from the actual set. 16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN Telephone: 03 (3837) 5321 X0166V.02 DE/CDM 0302...

  • Page 2: Safety Precautions

    DRR-M31 SAFETY PRECAUTIONS The following check should be performed for the continued protection of the customer and service technician. LEAKAGE CURRENT CHECK Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis resistance check.

  • Page 3: Top Cover

    DRR-M31 DISASSEMBLY (Follow the procedure below in reverse order when reassembling) 1. TOP COVER Remove 2 screws ① fixing from the both sides. Remove 5 screws ② fixing to the Rear Plate, then detach the Top Cover in the arrow di- rection .

  • Page 4: Rear Plate

    DRR-M31 4. REAR PLATE Pull up the Power Cord together with the cord bush to disengage from the Rear Plate. Remove 3 screws ⑤ fixing the 4P pin jack and AC outlet respectively. Remove 1 screw ⑥ , and detach the Rear Plate.
  • Page 5 DRR-M31 ADJUSTMENTS ADJUSTMENTS Adjusting and Checking the Mechanism Section 4. Adjustment of the recording/playback head 1. Replacement of the pinch roller Before replacing the pinch roller, clean the tape contact Azimuth adjustment surface of the pinch roller and the tape contact surface of Load side A of the A-BEX TCC-153 test tape facing the capstan shaft.
  • Page 6 DRR-M31 6. Checking the back tension torque at the time of recording and playback 8. Checking the FF and REW time Load a cassette type torque meter (Sony TW2111A at Load a Type 1 tape (UD-1), and check that the time for the FWD side, Sony TW2121A at the REV side) and check FF and REW is less than 120 seconds.
  • Page 7 DRR-M31 3. Azimuth Adjustment (1) Connect an electronic voltmeter to the Line Out terminal, and set Test tape MTT-114N into the Unit. (2) Playback FWD side,and adjust the azimuth screw A PB Amp so as to get maximum indication on the voltmeter,...

  • Page 8: Adjustment Points

    DRR-M31 6. Bias Current Adjustment (1) Set Test Tape (Type1 tape: UD-1) into the Unit, and REC Amp record 400mV -23dB 1.25kHz/12.5kHz signal at JK301 LINE IN level on the tape. (2) Playback the recorded signal, and adjust VR306 (Lch) 1.25kHz...

  • Page 9: Block Diagram

    DRR-M31 BLOCK DIAGRAM PLAYBACK PLAY BACK LEVEL ADJ. TU201,202 PB IN IC203 PB OUT ( Lch ) LINE OUT R/P HEAD DOLBY IC IC204 REC IN VR203,204 REC OUT IC201 LEVEL DETECT AMP ( A/D ) TP215,216 TR208,209 TR206,207 LINE MUTE...

  • Page 10: Top View

    Hi-z Deck mecha PACK SW input P23/STB Hi-z Not used (connect to GND) P22/SCK1 SERCLK Hi-z DENON BUS communication clock signal (Edge intervention) P21/SO1 SEROUT Hi-z DENON BUS communication output data signal P20/SI1 Hi-z DENON BUS communication input data signal...
  • Page 11 P02/INTP2 REEL Hi-z Supply reel pulse input signal P01/INTP1 Hi-z Not used P00/INTP0 SERINT Hi-z DENON BUS communicate intervention signal Internal connection terminal,connect to Vss Hi-z Not used: open Hi-z Not used: open Hi-z Not used: open Hi-z 5V power...

  • Page 12: Front View

    DRR-M31 HA12136AF (IC302) SIDE CHAIN BIAS SIDE CHAIN TRANSISTOR DTA Series DTC Series DTA114TK OUT (C) OUT (C) DTA124EK DTC114TK FRONT VIEW GND (E) GND (E) DTC124EK DTC143EK DTA114TK 10kohm DTC114TK 10kohm DTC323TK DTA124EK 22kohm 22kohm DTC124EK 22kohm 22kohm DTC143TK 4.7kohm...

  • Page 13: Printed Wiring Boards

    DRR-M31 PRINTED WIRING BOARDS 1U-3501-1 MAIN UNIT / 1U-3501-2 AMP UNIT / 1U-3501-3 DISP UNIT COMPONENT SIDE...
  • Page 14 DRR-M31 FOIL SIDE...

  • Page 15: Note For Parts List

    DRR-M31 NOTE FOR PARTS LIST Part indicated with the mark " " are not always in stock and possibly to take a long period of time for supplying, or in some case supplying of part may be refused. When ordering of part, clearly indicate "1" and "I" (i) to avoid mis-supplying.
  • Page 16 DRR-M31 PARTS LIST OF P.W.B. UNIT ASS'Y 1U-3501 DECK UNIT ASS'Y Ref. No. Part No. Part Name Remarks SEMICONDUCTORS GROUP IC201 263 0402 005 BA6209 IC202 268 0073 905 ICP-N15T IC203 262 3178 003 UPD78044FGF-212-3B9 IC204 263 0792 003 NJM78M06FA(S)
  • Page 17 DRR-M31 Ref. No. Part No. Part Name Remarks ZD203 276 0760 905 MTZJ3.6B T77 ZD204 276 0636 903 MTZJ8.2BT77 ZD206 276 0760 905 MTZJ3.6B T77 ZD207 276 0760 918 MTZJ3.9B T77 ZD208,209 276 0760 963 MTZJ6.2B T77 ZD210,211 276 0636 903 MTZJ8.2BT77...
  • Page 18 DRR-M31 Ref. No. Part No. Part Name Remarks R248 241 2313 985 RD14B2E4R7JFRST R249 244 2051 974 RS14B3A102JNBST(S) R250 247 2005 987 RM73B--221JT R251,252 241 2313 985 RD14B2E4R7JFRST R253 247 2007 943 RM73B--102JT R254 241 2379 987 RD14B2E102JNBST R255,256 247 2007 943...
  • Page 19 DRR-M31 Ref. No. Part No. Part Name Remarks R343 247 2008 984 RM73B--392JT R345 247 2008 984 RM73B--392JT R346,347 247 2008 942 RM73B--272JT R348,349 247 2007 943 RM73B--102JT R350 247 2010 914 RM73B--133JT R351 247 2007 969 RM73B--122JT R352 247 2010 914...
  • Page 20 DRR-M31 Ref. No. Part No. Part Name Remarks C203 257 0516 909 CK73B1E223KT C204 257 0512 903 CK73F1E104ZT C205 254 4541 942 CE04W1E101MT SMG/RE3 C206 254 4524 985 CE04W1H100MT SMG/RE3 C207 257 0511 904 CK73F1H103ZT C208 254 4537 707 CE04W1A102MC SMG/RE3...
  • Page 21 DRR-M31 Ref. No. Part No. Part Name Remarks C365 256 1058 968 CF93A1H823JT (JL) C366 257 0509 903 CK73B1H821KT C367 255 1265 936 CQ93M1H103JT(B) C368 257 0509 903 CK73B1H821KT C369 255 1265 936 CQ93M1H103JT(B) C370 254 4541 939 CE04W1E470MT SMG/RE3...

  • Page 22: Exploded View

    DRR-M31 EXPLODED VIEW WARNING: Parts marked with this symbol have critical characteristics. Use ONLY replacement parts recommended by the manufacturer.

  • Page 23: Parts List Of Exploded View

    DRR-M31 PARTS LIST OF EXPLODED VIEW Ref. No. Part No. Part Name Remarks Q'ty 1U-3501 DECK UNIT DISP UNIT MAIN UNIT AMP UNIT 131 0156 106 DENON BADGE 144 2820 119 FRONT PANEL 113 1890 007 DOLBY KNOB 114 0153 007...
  • Page 24 DRR-M31 Ref. No. Part No. Part Name Remarks Q'ty 473 7004 016 4X6 CBTS (S)-Z ★...
  • Page 25 DRR-M31 EXPLODED VIEW OF CASSETTE MECHANISM UNIT...
  • Page 26 DRR-M31 PARTS LIST OF CASSETTE MECHANISM UNIT Ref. No. Part No. Part Name Remarks Q'ty Ref. No. Part No. Part Name Remarks Q'ty   MAIN CHASSIS MT70-00486B AZIMUTH SCREW 2X5 6009-000335   HEAD BASE MT70-00376A WASHER 6031-000622 ...
  • Page 27 DRR-M31 Ref. No. Part No. Part Name Remarks Q'ty 210 958 7006 007 GEAR P ASS'Y ADR17-005 LOADER SECTION (ACLM-574D) 101 958 7001 109 FLAME ASS'Y A1A001 104 958 7001 206 TRAY A1G031 105 958 7001 303 CHASSIS A1P001 107 958 7001 400 HOLDER ASS'Y...

  • Page 28: Packing View

    DRR-M31 PACKING VIEW PARTS LIST OF PACKING & ACCESSORIES Ref. No. Part No. Part Name Remarks Q'ty Ref. No. Part No. Part Name Remarks Q'ty 201 505 0038 030 POLY COVER 207 503 1458 105 CUSHION(L) 202 511 3983 006 INST.MANUAL(E2) 208 503 1459 104 CUSHION(R) 203 515 0921 102 S.S.LIST(EX)

  • Page 29: Wiring Diagram

    DRR-M31 WIRING DIAGRAM...

  • Page 30: Note For Schematic Diagram

    DRR-M31 NOTE FOR SCHEMATIC DIAGRAM WARNING: Parts marked with this symbol have critical characteristics. Use ONLY replacement parts recommended by the Ω k kΩ M MΩ manufacturer. µF p CAUTION: Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis resistance check.

  • Page 31: Schematic Diagrams

    DRR-M31 SCHEMATIC DIAGRAMS (1/2) DRR-M31 POWER TRANS (E3) 223 6453 002 AC CORD (E3) 206 2160 009 AC OUTLET (E3/J) 203 3990 004 OPEN : +7.2 V CLOSE : +7.4 V SCHEMATIC DIAGRAMS (1/2) 1U-3501-1 1U-3501-2...
  • Page 32 DRR-M31 SCHEMATIC DIAGRAMS (2/2) PLAY: STOP, REC PLAY: -7.4V NORMAL : +9V HIGH : +14V REC SIGNAL LINE PB SIGNAL LINE SCHEMATIC DIAGRAMS (2/2) 1U-3501-3...

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