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SERVICE MANUAL
2011
7 S ERVICE MANUAL
MA492<Rev.003>
KD-A725J, KD-R720J, KD-R721BTE,
KD-R721BTEU, KD-R721BTEY, KD-R726U,
KD-R726UH, KD-R726UT, KD-R727BTEE,
KD-R728BTJ, KD-R729BTUR, KD-S48J,
For
KD-R721BT, KD-R727BT,
KD-R728BT, KD-R729BT
For KD-A725, KD-R720, KD-R726, KD-S48,KD-S88BT
For KD-A725, KD-R720,
KD-R721BT, KD-R726,
KD-R728BT, KD-R729BT,
KD-S48, KD-S88BT
COPYRIGHT © 2011 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
CD RECEIVER
KD-S88BTJ
For KD-A725, KD-R720,
KD-R728BT, KD-S48, KD-S88BT
TABLE OF CONTENTS
COPYRIGHT © 2011 Victor Company of Japan, Limited
For KD-R721BT, KD-R727BT
For KD-R721BT, KD-R727BT, KD-R728BT, KD-R729BT
For KD-A725,
KD-R720, KD-R728BT,
KD-S48, KD-S88BT
For KD-A725,
KD-R720, KD-S48,
KD-S88BT
No.MA492<Rev.003>
2011/7
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Summary of Contents for JVC KD-A725J
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Page 1: Table Of Contents
SERVICE MANUAL CD RECEIVER MA492<Rev.003> 2011 7 S ERVICE MANUAL KD-A725J, KD-R720J, KD-R721BTE, KD-R721BTEU, KD-R721BTEY, KD-R726U, KD-R726UH, KD-R726UT, KD-R727BTEE, KD-R728BTJ, KD-R729BTUR, KD-S48J, KD-S88BTJ For KD-R721BT, KD-R727BT For KD-A725, KD-R720, For KD-A725, KD-R721BT, KD-R727BT, KD-R728BT, KD-S48, KD-S88BT KD-R720, KD-S48, KD-R728BT, KD-R729BT... - Page 2 SPECIFICATION KD-A725/KD-R720/KD-S48/KD-S88BT AUDIO AMPLIFIER SECTION Power Output 20 W RMS × 4 Channels at 4 Ω and ≤ 1% THD+N 80 dBA (reference: 1 W into 4 Ω) Signal-to-Noise Ratio 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Frequency Response 40 Hz to 20 000 Hz Line-Out or Subwoofer-Out Level / Impedance...
- Page 3 KD-R721BT, KD-R727BT, KD-R729BT AUDIO AMPLIFIER SECTION Maximum Power Output 50 W per channel Continuous Power Output (RMS) 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion. Signal-to-Noise Ratio 70 dB 4 Ω...
- Page 4 KD-R726 AUDIO AMPLIFIER SECTION Maximum Power Output 50 W per channel 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 1% total harmonic distortion. Continuous Power Output (RMS) Signal-to-Noise Ratio 70 dB Load Impedance 4 Ω...
- Page 5 KD-R728BT AUDIO AMPLIFIER SECTION Power Output 20 W RMS × 4 Channels at 4 Ω and ≤ 1% THD+N Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω) 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Frequency Response 40 Hz to 20 000 Hz Line-Out or Subwoofer-Out Level / Impedance 2.5 V/20 kΩ...
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Page 6: Precaution
SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across... - Page 7 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
- Page 8 Important for laser products 1.CLASS 1 LASER PRODUCT 5.CAUTION : If safety switches malfunction, the laser is able to function. 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation 6.CAUTION : Use of controls, adjustments or performance of when open.
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Page 9: Specific Service Instructions
SECTION 2 SPECIFIC SERVICE INSTRUCTIONS KD-S88BTJ The KD-S88BTJ is packaged products of a CD RECEIVER and a BLUETOOTH ADAPTER+Microphone. CD RECEIVER BLUETOOTH ADAPTER KD-R720J KS-UBT1+ Microphone SECTION 3 DISASSEMBLY Main body (Used model : KD-R720) 3.1.1 Removing the Bottom chassis (See Fig.1) (2) Remove the two screws B attaching both sides of the Top (1) Disengage the seven hooks a engaging the Bottom chas- chassis. - Page 10 (4) Disconnect the board to board connector CN502 connect- CD mechanism assembly section ing the Main board and the CD mechanism. (See Fig.6) 3.2.1 Removing the Mecha control board (1) Solder the short land on the pickup. (See Fig. 1) SOLDER CN502 Fig.6...
- Page 11 3.2.2 Removing the Traverse mechanism (See Fig.4, 5) (2) Remove the shaft from the TM base. (See Fig.7) (1) Remove the five springs from the traverse mechanism. (3) Disengage the hook a on the pickup from the TM base. (See Fig.4) (See Fig.7) shaft Fig.4...
- Page 12 (2) Remove the HC CL. base from th holes on the TM base. 3.2.5 Removing the Loading motor (See Fig.9) (1) Remove the roller arm assembly from the bottom frame as- sembly. (See Fig.11) Fig.9 (3) Remove the two screws D attaching the spindle motor. (See Fig.10) Fig.11 (2) Remove the two screws E attaching the loading motor as-...
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Page 13: Adjustment
SECTION 4 ADJUSTMENT Test instruments required for adjustment Standard volume position (1) Digital oscilloscope (100MHz) Balance and Bass &Treble volume : lndication"0" (2) Digital tester Loudness : OFF (3) Test Disc Dummy load Standard measuring conditions Exclusive dummy load should be used for AM,and FM. Power supply voltage DC14.4V(10.5 to 16V) For FM dummy load, there is a loss of 6dB between SSG output Load impedance 20K ohm (2 Speakers connection) - Page 14 Service Mode • Operating key: [MENU] → [DOWN] (3 sec) • Navigation key : Press [SEL] in any main display item to select that option. • Volume knob turn : forward and backward selection. INIT ALL Initialize all data to factory shipment state. MECHA DISP CD mechanism No.
- Page 15 Tuner service mode 4.7.1 Key operation (FM and AM mode) • Enter service mode: [SEL] → [MENU] (3 sec) • Exit service mode: press [ENTER] (SEL) key. • Go to next item: press [DISP] key • Back to previous item: press [BACK] key VER=#*** MICON version display # indicates destination: J=USA, U=OTHERS (eg.
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Page 16: Troubleshooting
SECTION 5 TROUBLESHOOTING 16PIN CORD DIAGRAM • For KD-A725,KD-R720,KD-R728BT WH/BK GN/BK Black Green GY/BK VI/BK Violet Blue LB Light Blue LB/YL White Orange BL/WH Gray Yellow OR/WH GN / BK VI / BK OR / WH BL / WH LB / YL WH / BK GY / BK 1-16 (No.MA492<Rev.003>) - Page 17 • For KD-R721BT White Green Black Violet Gray Light Blue Blue Yellow WH/BK GN/BK Orange GY/BK VI/BK LB/YL BL/WH OR/WH VI/BK GY/BK WH/BK BL/WH OR/WH GN/BK RD 3 RD 1 RD 2 YL 1 YL 2 OR / WH BL / WH GN / BK VI / BK WH / BK...
- Page 18 • For KD-R726 WH/BK GN/BK Green White GY/BK VI/BK Black Violet Light Blue Gray Blue Yellow LB/YL Orange BL/WH OR/WH GN / BK VI / BK OR / WH LB / YL BL / WH WH / BK GY / BK 1-18 (No.MA492<Rev.003>)
- Page 19 • For KD-R727BT White Green Black Violet Gray Orange WH/BK GN/BK Blue Yellow GY/BK VI/BK BL/WH OR/WH VI/BK GY/BK WH/BK BL/WH OR/WH GN/BK RD 3 RD 1 RD 2 YL 1 YL 2 OR / WH BL / WH GN / BK VI / BK WH / BK GY / BK...
- Page 20 Victor Company of Japan, Limited J&K Car Electronics Corporation 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525, Japan (No.MA492<Rev.003>) Printed in Japan...