Kenwood KDC-V7521/Y Service Manual
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Kenwood KDC-V7521/Y Service Manual

Kenwood KDC-V7521/Y Service Manual

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CD RECEIVER
KDC-V7521/Y
SERVICE MANUAL
This service manual does not include information on the CD mechanism assembly (exploded view, parts list,
schematic diagram or mechanism operation description).
For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X,
: B51-7867-00).
KDC-V7521/Y
Remote controller assy
(A70-2025-05)
DC cord
(E30-4942-05): KDC-V7521Y
(E30-4956-05): KDC-V7521
Front glass
(B10-4161-01)
Remote controller assy
Torsion coil spring
(A70-0886-15)
(G01-2924-04)
Plastic cabinet assy
(A02-1497-13)
© 2001-11 PRINTED IN JAPAN
B51-7869-00 ( N ) 1940
Escutcheon assy
Panel assy
(B07-3007-03)
(A64-2582-02)
Lever
(D10-4562-04)
(D10-4621-04):KDC-V7521
Mounting hardware assy
(J21-9716-03)
Screw set
(N99-1704-05)
Antenna adaptor
(T90-0523/0534-05)

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Summary of Contents for Kenwood KDC-V7521/Y

  • Page 1 CD RECEIVER KDC-V7521/Y SERVICE MANUAL © 2001-11 PRINTED IN JAPAN B51-7869-00 ( N ) 1940 This service manual does not include information on the CD mechanism assembly (exploded view, parts list, schematic diagram or mechanism operation description). For such information, please refer to the CD mechanism assembly service manual (X92-4030-0X, X92-4440-0X, : B51-7867-00).
  • Page 2 A1,Q53 SW5V PLL+B Q43,44 FM+B 251mV Q45,46 230mV AM+B Q37-40 AUDIO OUT PRE OUT MUTE OUTPUT VOLTAGE E-VOL 3600mV Q32,33,35 1372mV S-METER 855mV MUTE DRIVER CHANGER 3600mV IFC OUT PLL DATA SW5V IC14 PLL CLK SW5V 1200mV NOISE DECODER BUFFER POWER IC SP-OUT SERVO+B...

  • Page 3: Component Description

    KDC-V7521/Y COMPONENT DESCRIPTION SWITCH UNIT (X16-154X-XX, X16-1892-70) Ref.No. Component name Application/Function Operation/Condition/Compatibility LC75808W LCD driver with key matrix RS-171 Remote sensor IC M62333FP D/A converter The brightness control of red, green and blue colour DTA114EUA or KRA302 Key permission SW...
  • Page 4 KDC-V7521/Y COMPONENT DESCRIPTION Ref.No. Component name Application/Function Operation/Condition/Compatibility When Q9's base goes Hi, SERVO +B AVR 2SD2375 SERVO +B AVR outputs +7.6V. While Q11's base goes Hi, AVR outputs +10.7V. 2SB1184 ILL +B AVR Works during POWER ON mode with a panel 2SC4081 or 2SD1819A attached to the set.

  • Page 5: Microcomputer's Terminal Description

    KDC-V7521/Y MICROCOMPUTER’S TERMINAL DESCRIPTION IC1 (ELECTRIC UNIT : X25-9392-7X, X25-8762-72) Pin No. Pin Name Description Processing Operation AM+B AM+B control Hi : During AM reception Hi : During FM reception, Hi : During FM reception FM+B FM+B control if with RDS, RDBS...
  • Page 6 KDC-V7521/Y MICROCOMPUTER’S TERMINAL DESCRIPTION Pin No. Pin Name Description Processing Operation Sub clock resonator connection terminal Capacitor conection terminal for regulator inside REGC microprocessor Oscillation : POWER ON mode, Oscillation stop : Main clock resonator connection terminal POWER OFF mode or momentary power down...
  • Page 7 KDC-V7521/Y MICROCOMPUTER’S TERMINAL DESCRIPTION Pin No. Pin Name Description Processing Operation AVSS A/D converter ground connection terminal Connected to GND lines. AVREF A/D converter reference voltage input terminal 1V or less : TEL MUTE, 2.5V or greater : NAVI PHONE...

  • Page 8: Test Mode

    KDC-V7521/Y TEST MODE 1. How to enter the test mode • Pressing the key on the remote initiates the audio ad- While holding the FM and Preset 6 keys, reset the unit. justment mode. 2. How to exit from the test mode •...
  • Page 9 KDC-V7521/Y TEST MODE 11. Other specifications 2) Press the CLK key to enter the Mask key registration • Automatic panel closing when a CD is inserted is inhib- mode. “TRANSMIT1” should be displayed now. The dis- ited. (M&T model) play at this time should show “< >” in place of “ [ ] ”.
  • Page 10 KDC-V7521/Y CIRCUIT DESCRIPTION/ATTENTION Variable Illumination Circuit Using a DAC that can be varied in 256 steps between 0V to the buffer and that will be the input voltage of the V-I con- and 5V and varying DAC output voltage, the currents that flow verter in the next stage with the voltage waveform of C .
  • Page 11 PC BOARD (COMPONENT SIDE VIEW) X16-154X-XX A/2 (J74-1305-12) X16-1892-70 A/2 (J74-1305-12) X25-9392-7X (J74-1398-02) X25-8762-72 (J74-1408-02) X16-1XXX-XX X25-XXX2-7X IC Q Address IC Address RESET R231 C149 R230 C143 C142 IFCOUT 20.0M R100 32.768K C200 R102 R214 R215 R216 35 3D 50 3C C134 51 2C W100...
  • Page 12 PC BOARD (FOIL SIDE VIEW) X16-154X-XX A/2 (J74-1305-12) X25-9392-7X (J74-1398-02) X16-1892-70 A/2 (J74-1305-12) X25-8762-72 (J74-1408-02) ILL+B DGND IC15 C161 CP56 R237 R136 DA-SCL IC16 X16-1XXX-XX R137 R239 DA-SDA X25-XXX2-7X R130 IC Q Address IC Q Address R134 R135 R133 R131 10 2O R132 Q53-55...
  • Page 13 SP OUT/DC IN F1 10A GRN/BLK WHT/BLK 10 7 REAR FRONT VIOL/BLK GRY/BLK CORD 11 6 VIOL 12 5 CH-IN P. CON PNK/BLK BLU/WHT EXT. CONT. 13 4 ANT CON C151 ELECTRIC UNIT (X25-9392-7X/8762-72) BLU/WHT P.CON TEL MUTE 2200P ORG/WHT 2.2K EXT.AMP C12 0.1...
  • Page 14 CH CORD ANT. DTA124JK BU5V DTC114YUA DTC143TUA UN5213 2SB1184 100x2 1Kx2 5.0V UN5214 1.6V 2SA1576A 5.0V R72 1K 52mH 2SB1218A RF GND 2.2K 2SD1819A 1Kx2 FM ANT SRM-SW1 AM ANT 5.0V GND5 5.0V OSC GND 2.2K SRM-SW2 5.0V Q43,44 4.7uH CH-MUTE R210 FM +B...
  • Page 15 S.GND C3 0.1 VLCD2 3.4V C2 0.1 VLCD3 1.7V CP50 CP52 470x2 470x2 C50 0.01 C54 0.01 KDC-V7521/Y (2/2) VLCD4 R50 150 R56 150 R51 150 R57 150 C1 680P TEST : LC75808W R1 43K : RS-171 5.0V M62333FP C51 0.01 0.01...

  • Page 16: Exploded View (Unit)

    KDC-V7521/Y EXPLODED VIEW (UNIT) M2x2 (BLK) N09-4400-05 M2x2.5 N09-4401-05 φ2x4 N09-4427-05 PFPC1 M2x2.5 N09-4448-05 M2x1.8 (BLK) N09-4449-05 FLAT WASHER N19-2154-04 DME1 FLAT WASHER N19-2155-04 FLAT WASHER N19-2156-04 RETAINING RING N29-0523-05 RETAINING RING N29-0522-05 M2x2.5 N38-2025-46 φ2x5 N80-2005-46 φ2x8 (BLK) N80-2008-45 φ3x5...

  • Page 17: Parts List

    KDC-V7521/Y PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No. Description Ref. No.
  • Page 18 KDC-V7521/Y PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. SUB-CIRCUIT UNIT (X16-118X-XX) Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No.
  • Page 19 KDC-V7521/Y PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. ELECTRIC CIRCUIT UNIT (X25-XXX2-7X) Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No.
  • Page 20 KDC-V7521/Y PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. ELECTRIC CIRCUIT UNIT (X25-XXX2-7X) Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No.
  • Page 21 KDC-V7521/Y PARTS LIST New parts Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. ELECTRIC CIRCUIT UNIT (X25-XXX2-7X) Teile ohne Parts No. werden nicht geliefert. Desti- Desti- Ref. No. Parts No.
  • Page 22 KDC-V7521/Y...

  • Page 23: Specifications

    KENWOOD ELECTRONICS GULF FZE KENWOOD ELECTRONICS UK LIMITED P.O. Box 61318, Jebel Ali, Dubai, U.A.E. Kenwood House, Dwight Road, Watford, Herts, WD1 8EB, United Kingdom KENWOOD ELECTRONICS (THAILAND) CO., LTD. KENWOOD ELECTRONICS DEUTSCHLAND GMBH 2019 New Pechburi Road, Bangkapi, Huaykwang, Bangkok, 10320 Thailand Rembrücker-Str.

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