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Aiwa NSX-VC78 Service Manual

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SERVICE MANUAL
COMPACT DISC STEREO
CASSETTE RECEIVER
SYSTEM
NSX–VC78
• This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
NSX-VC78 (HR), (S/M Code No. 09-003-431-0T1).
• If requiring information about the CD mechanism, see Service Manual of
AZG-1, (S/M Code No. 09-001-335-3NG).
• This Service Manual does not include "CD TEST MODE". This item will
be issued in the next Supplement.
NSX-VC78
BASIC TAPE MECHANISM : 2ZM-3MK2 PR4NM
BASIC CD MECHANISM : AZG-1 VZD3RDM
CD
CASSEIVER
CX–NVC78
SX–WNSZ70
S/M Code No. 09-006-431-0R1
MAIN
REMOTE
SPEAKER
CONTROLLER
RC–ZAS07
HR

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  • Page 1 SX–WNSZ70 RC–ZAS07 • This Service Manual is the "Revision Publishing" and replaces "Simple Manual" NSX-VC78 (HR), (S/M Code No. 09-003-431-0T1). • If requiring information about the CD mechanism, see Service Manual of AZG-1, (S/M Code No. 09-001-335-3NG). • This Service Manual does not include “CD TEST MODE”. This item will be issued in the next Supplement.

  • Page 2: Specifications

    SPECIFICATIONS FM tuner section Compact disc player section Tuning range 87.5 MHz to 108 MHz Laser Semiconductor laser (λ =780 nm) Usable sensitivity (IHF) 13.2 dBf D-A converter 1 bit dual Antenna terminals 75 ohms (unbalanced) Signal-to-noise ratio 85 dB (1 kHz, 0 dB) Harmonic distortion 0.05 % (1 kHz, 0 dB) MW tuner section...

  • Page 3: Protection Of Eyes From Laser Beam During Servicing

    PROTECTION OF EYES FROM LASER BEAM DURING SERVICING This set employs laser. Therefore, be sure to follow carefully CAUTION the instructions below when servicing. Use of controls or adjustments or performance of proce- dures other than those specified herin may result in WARNING!! hazardous radiation exposure.

  • Page 4: Note On Before Starting Repair

    NOTE ON BEFORE STARTING REPAIR 1. Forced discharge of electrolytic capacitor of power supply block When repair is going to be attempted in the set that uses relay circuit in the power supply block, electric potential is kept charged across the electrolytic capacitors (C101, 102) even though AC power cord is removed.
  • Page 5 In such a case, check also if the POWER AMPLIFIER circuit or power supply circuit has any abnormalities or not. 2-2. Regarding reset There are cases that the machine does not work correctly because the MICROCOMPUTER is not reset even though the AC power cord is re-inserted, or the software reset (pressing the STOP key + POWER key) is performed.

  • Page 6: Electrical Main Parts List

    ELECTRICAL MAIN PARTS LIST REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION 87-010-406-080 CAP, ELECT 22-50V 87-010-406-080 CAP, ELECT 22-50V 8A-NH7-601-010 C-IC,LC876564-VCD 87-010-406-080 CAP, ELECT 10-50V 87-A21-018-040 C-IC,M65849BFP631D 87-010-263-080 CAP, ELECT 100-10V 87-A21-418-010 IC,STK490-340 87-010-197-080 CAP, CHIP 0.01 DM 87-A21-397-010 IC,STK490-070 87-A20-561-040...
  • Page 7 REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION C378 87-010-196-080 CHIP CAPACITOR,0.1-25 C644 87-010-401-080 CAP, ELECT 1-50V C379 87-010-382-080 CAP, ELECT 22-25V C671 87-010-322-080 C-CAP,S 100P-50 CH C380 87-010-382-080 CAP, ELECT 22-25V C672 87-010-322-080 C-CAP,S 100P-50 CH C381 87-010-197-080 CAP, CHIP 0.01 DM...
  • Page 8 REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION C952 87-010-197-080 C-CAP,S 0.01-25 K B C2012 SFR351 87-A90-433-080 SFR,50K H NVZ6TLTA C953 87-010-197-080 C-CAP,S 0.01-25 K B C2012 SFR352 87-A90-433-080 SFR,50K H NVZ6TLTA C954 87-010-400-080 CAP,E 0.47-50 M 11L SME TC941 87-011-254-080 TRIMMER,CER 20P 4.0X4.5 ECR...
  • Page 9 REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION C653 87-010-213-080 C-CAP,S 0.015-50 B S331 87-A91-024-180 SW,TACT KSHG611BT C701 87-010-260-040 CAP,E 47-25 SME S332 87-A91-024-180 SW,TACT KSHG611BT C802 87-010-168-080 CAP, CHIP 150P S333 87-A91-024-180 SW,TACT KSHG611BT C804 87-010-187-080 CAP CHIP S5600P S334...

  • Page 10: Chip Resistor Part Code

    REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION L251 87-A50-610-010 COIL,1UH K(MDEC) 87-A11-148-080 CAP,TC U 0.1-50 Z F L252 87-A50-610-010 COIL,1UH K(MDEC) 87-A11-148-080 CAP,TC U 0.1-50 Z F R129 87-A00-262-080 RES,M/F 0.15-2W J 87-A11-148-080 CAP,TC U 0.1-50 Z F R130 87-A00-262-080 RES,M/F 0.15-2W J...

  • Page 11: Transistor Illustration

    TRANSISTOR ILLUSTRATION E C B B C E E C B KTA1266GR CD1585BC 2SB1370E DTC114ES KTC3198GR CSC4115BC KTC3199GR CSA952K 2SA1235F RT1N141C 2SK2158 2SC2714O RT1P141C 2SJ461-T1 2SC3052F RT1P144C 2SK360E CMBT5551 RT1P441C CMBT5401 2SA933SRS CSD1306E – 11 –...
  • Page 12 WIRING - 1 (MAIN / VM) – 12 –...
  • Page 13 SCHEMATIC DIAGRAM - 1 (MAIN 1/3 : AMP/ VM) – 13 –...
  • Page 14 SCHEMATIC DIAGRAM - 2 (MAIN 2/3 : DECK / HEAD-1 / HEAD-2) – 14 –...
  • Page 15 SCHEMATIC DIAGRAM - 3 (MAIN 3/3 : TUNER) – 15 –...

  • Page 16: Wiring - 2 (Front)

    WIRING - 2 (FRONT) – 16 –...

  • Page 17: Schematic Diagram - 4 (Front /Deck)

    SCHEMATIC DIAGRAM - 4 (FRONT /DECK) – 17 –...
  • Page 18 WIRING - 3 (AMP) – 18 –...

  • Page 19: Schematic Diagram - 5 (Amp)

    SCHEMATIC DIAGRAM - 5 (AMP) – 19 –...
  • Page 20 WIRING - 4 (KEY CON) – 20 –...
  • Page 21 SCHEMATIC DIAGRAM - 6 (KEY CON) – 21 –...
  • Page 22 WIRING - 5 (PT) – 22 –...

  • Page 23: Schematic Diagram - 7 (Pt)

    SCHEMATIC DIAGRAM - 7 (PT) – 23 –...
  • Page 24 WIRING - 6 (DECK / HEAD-1 / HEAD-2) – 24 –...

  • Page 25: Ic Block Diagram

    IC BLOCK DIAGRAM – 25 –...
  • Page 26 – 26 –...
  • Page 27 – 27 –...
  • Page 28 FL (BJ754GNK) GRID ASSIGNMENT AND ANODE CONNECTION GRID ASSIGNMENT – 28 –...
  • Page 29 ANODE CONNECTION – 29 –...
  • Page 30 IC DESCRIPTION IC, LC876564-VCD Description Pin No. Pin Name O-CLK Common serial CLOCK output. O-DATA Common serial DATA output. O-STB Common serial STROBE output. O-POWER System power ON/OFF output. O-STB Strobe output for shift register. O-RYM-CS Chip select output for rhythm IC. O-PLL-CE Chip enable output for PLL.
  • Page 31 Pin No. Pin Name Description P22/DSP FL segment P22 output / DSP less diode input (not used). P21/PRO/5.1 FL segment P21 output / PRO-LOGIC 5.1CH diode input (not used). P20/K-CON FL segment P20 output / KEY CON diode input. P19/DOBLY FL segment P19 output / Deck DOBLY diode input (not used).
  • Page 32 ADJUSTMENT (TUNER / DECK / FRONT) A MAIN C.B L941 TC943 L802 L801 TC941 IC801 R815 L942 (CLK) L953 L952 FFE831 (VT) TP8 (LCH) TP9 (RCH) IC601 < TUNER SECTION > 1. Clock Frequency Check 5. SW Tracking Adjustment Settings : • Test point : TP2 (CLK) Settings : •...
  • Page 33 A MAIN C.B SFR351 SFR352 IC303 CN351 TP10 (LCH) TP11 (RCH) IC601 B FRONT C.B FL201 IC101 TP6 (GND) L101 (K-SCAN) DECK-1 P,DECK-2 R/P/E HEAD G DECK C.B SFR1 – 33 –...
  • Page 34 < DECK SECTION > 1. Tape Speed Adjustment (DECK 2) 6. REC/PB Frequency Response Check (DECK 2) Settings : • Test tape : TTA-100 (3kHz) Settings : • Test tape : TTA-615 (CrO • Test point : TP10 (Lch), TP11 (Rch) •...

  • Page 35: Mechanical Exploded View

    MECHANICAL EXPLODED VIEW 1 / 1 AZG-1 P.C.B P.C.B HT-SINK BINDER, WIRE HT-SINK P.C.B P.C.B 38 39 2ZM-3MK2 PLATE, EARTH MECHA BINDER, WIRE CHAS,MAIN – 35 –...

  • Page 36: Mechanical Parts List

    87-A80-157-010 AC CORD ASSY,E BLK CC 8A-NH7-006-010 WINDOW,DISP H 87-085-185-010 BUSHING, AC CORD (E) 8A-NH7-005-010 PANEL,TRAY U 87-085-221-010 FOOT,H13.5 87-CE3-023-010 BADGE,AIWA 30N SILV 8Z-NB8-254-010 COVER, PL M3 8A-NF7-008-010 PANEL,CD 8Z-NB8-240-010 COVER, PL 8A-NF8-007-010 PANEL,LEFT V-2 87-067-703-010 TAPPING SCREW, BVT2+3-10 8A-NF8-006-010...
  • Page 37 TAPE MECHANISM EXPLODED VIEW 1 / 1 PH(DECK 1) RPH(DECK 2) DECK C.B CUSH-G,DIA3.7-8-3.2 CUSH-G,DIA3.7-8-3.2 HLDR,IC HLDR,IC CAPSTAN N 2.2-41.7 CAPSTAN N 2.2-41.5 HEAD 1 C.B(DECK 1) HEAD 2 C.B(DECK 2) BELT D2 (DECK 1) (DECK 2) (DECK 1) (DECK 2) 2ZM3MK2 PR4N 2ZM3MK2 PR4N,YPR4N (BOTTOM SIDE)

  • Page 38: Tape Mechanism Parts List

    TAPE MECHANISM PARTS LIST 1 / 1 REF. NO. PART NO. KANRI DESCRIPTION REF. NO. PART NO. KANRI DESCRIPTION 1 82-ZM3-301-610 CHAS ASSY,M2 31 82-ZM1-255-310 SPR-E,LVR DIR 2 82-ZM1-258-210 SPR-T,PINCH L 32 82-ZM3-305-210 GEAR,CAM M2 3 82-ZM1-341-210 LVR ASSY,PINCH L2 33 82-ZM1-227-310 LVR,TRIG 4 82-ZM1-333-210...

  • Page 39: Speaker Disassembly Instructions

    SPEAKER DISASSEMBLY INSTRUCTIONS Type.1 Type.4 Insert a flat-bladed screwdriver into the position indicated by the TOOLS arrows and remove the panel. Remove the screws of each speaker 1 Plastic head hammer unit and then remove the speaker units. 2 (() flat head screwdriver 3 Cut chisel How to Remove the PANEL, FR Type.2...

  • Page 40: Accessories / Package List

    6 88-NS5-610-010 CORD,SPKR 7 88-NS5-611-010 CORD,SPKR B/L 8 8A-NS7-001-010 PANEL,FR 9 8A-NS7-004-010 PANEL,DUCT 10 8A-NS7-005-010 GRILLE,FRAME ASSY 11 8A-NSJ-006-010 BADGE,AIWA S35 ACCESSORIES / PACKAGE LIST REF. NO. PART NO. KANRI DESCRIPTION 8A-NH7-901-010 IB,H(EC-H)MVC78 87-A90-119-010 ANT WIRE SW(5M) 87-006-226-010 AM LOOP ANT C0...
  • Page 41 2–11, IKENOHATA 1–CHOME, TAITO-KU, TOKYO 110, JAPAN TEL:03 (3827) 3111 9301978 0251431 Printed in Singapore...

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