JVC KDAR-770-J Service manual
SERVICE MANUAL
CD RECEIVER
MA24720062
KD-AR770J,KD-G720J,KD-G721E,KD-G721EX,
KD-G721EY,KD-G721EU,KD-G722E,KD-G722EX,
KD-G722EY,KD-G722EU,KD-G724UI,KD-G725U,
KD-G725UN,KD-G725UH,KD-G725UT,KD-G727EE
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
COPYRIGHT © 2006 Victor Company of Japan, Limited
No.MA247
2006/2
SPECIFICATION
KD-AR770/KD-G720
AUDIO AMPLIFIER SECTION
Power Output 20 W RMS
Signal to Noise Ratio 80 dBA (reference: 1 W into 4
Load Impedance 4
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Line-Out Level/Impedance KD-AR770 4.0 V /20 k
KD-G720 2.5 V /20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V /20 kΩ load (full scale)
Other Terminals CD changer
Frequency Range FM 87.5 MHz to 107.9 MHz (with channel interval set to 100 kHz or 200 kHz)
AM 530 kHz to 1 710 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB
AM Tuner Sensitivity 20
Selectivity 35 dB
CD PLAYER/USB MEMORY SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format MPEG1/2 Audio Layer 3
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate : 192 kbps
Playable USB memory Format FAT 12/16/32
Storage Less than 4 GB (1 partition type)
Playable Audio Format MP3/WMA
Max. Current Less than 500 mA
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.4 kg (3.1 lbs) (excluding accessories)
× H × D) Installation Size (approx.) 182 mm × 52 mm × 152 mm (7-3/16" × 2-1/16" × 6")
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω
LINE IN plugs (only for KD-AR770)
TUNER SECTION
87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)
(with channel interval set to 10 kHz)
531 kHz to 1 602 kHz
(with channel interval set to 9 kHz)
µV
Max. Bit Rate : 320 kbps
GENERAL
°C to +40°C (32°F to 104°F)
× 4 Channels at 4 Ω and [< or =] 1% THD+N
Ω)
Ω load (full scale)
Ω load (full scale)
µV/75 Ω)
µV/75 Ω)
× 58 mm × 11 mm (7-7/16" × 2-5/16" × 7/16")
1-2 (No.MA247)
KD-G722/KD-G721
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4
harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
harmonic distortion.
Load Impedance 4
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.5 V/20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Other Terminals CD changer, Steering wheel remote input
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM (MW) 522 kHz to 1 620 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
MW Tuner Sensitivity 20
Selectivity 35 dB
[LW Tuner] Sensitivity 50
CD PLAYER/USB MEMORY SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format MPEG1/2 Audio Layer 3
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate : 192 kbps
Playable USB memory Format FAT 12/16/32
Storage Less than 4 GB (1 partition type)
Playable Audio Format MP3/WMA
Max. Current Less than 500 mA
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.4 kg (excluding accessories)
× H × D) Installation Size (approx.) 182 mm × 52 mm × 152 mm
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω load (full scale)
Ω
(LW) 144 kHz to 279 kHz
µV/75 Ω)
µV/75 Ω)
µV
µV
Max. Bit Rate : 320 kbps
°C to +40°C
× 58 mm × 11 mm
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
(No.MA247)1-3
KD-G724
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4
harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
harmonic distortion.
Load Impedance 4
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.5 V/20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Other Terminal CD changer
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
AM Tuner Sensitivity 20
Selectivity 35 dB
CD PLAYER/USB MEMORY SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format MPEG1/2 Audio Layer 3
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate : 192 kbps
Playable USB memory Format FAT 12/16/32
Storage Less than 4 GB (1 partition type)
Playable Audio Format MP3/WMA
Max. Current Less than 500 mA
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.4 kg (excluding accessories)
× H × D) Installation Size (approx.) 182 mm × 52 mm × 152 mm
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω load (full scale)
Ω
µV/75 Ω)
µV/75 Ω)
µV
Max. Bit Rate : 320 kbps
°C to +40°C
× 58 mm × 11 mm
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
1-4 (No.MA247)
KD-G725
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4
harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
harmonic distortion.
Load Impedance 4
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.5 V/20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Other Terminal CD changer
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
AM Tuner Sensitivity 20
Selectivity 35 dB
CD PLAYER/USB MEMORY SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format MPEG1/2 Audio Layer 3
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate : 192 kbps
Playable USB memory Format FAT 12/16/32
Storage Less than 4 GB (1 partition type)
Playable Audio Format MP3/WMA
Max. Current Less than 500 mA
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.4 kg (excluding accessories)
× H × D) Installation Size (approx.) 182 mm × 52 mm × 152 mm
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω load (full scale)
Ω
µV/75 Ω)
µV/75 Ω)
µV
Max. Bit Rate : 320 kbps
°C to +40°C
× 58 mm × 11 mm
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
(No.MA247)1-5
KD-G727
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (RMS) Front 19 W per channel into 4
harmonic distortion.
Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
harmonic distortion.
Load Impedance 4
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.5 V/20 k
Output Impedance 1 k
Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Other Terminal CD changer
TUNER SECTION
Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz
FM3 65.00 MHz to 74.00 MHz
AM (MW) 522 kHz to 1 620 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
MW Tuner Sensitivity 20
Selectivity 35 dB
LW Tuner Sensitivity 50
CD PLAYER/USB MEMORY SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
MP3 Decoding Format MPEG1/2 Audio Layer 3
WMA (Windows Media® Audio) Decoding Format Max. Bit Rate : 192 kbps
Playable USB memory Format FAT 12/16/32
Storage Less than 4 GB (1 partition type)
Playable Audio Format MP3/WMA
Max. Current Less than 500 mA
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0
Dimensions (W
Mass (approx.) 1.4 kg (excluding accessories)
× H × D) Installation Size (approx.) 182 mm × 52 mm × 152 mm
Panel Size (approx.) 188 mm
Ω (4 Ω to 8 Ω allowance)
Ω load (full scale)
Ω
(LW) 144 kHz to 279 kHz
µV/75 Ω)
µV/75 Ω)
µV
µV
Max. Bit Rate : 320 kbps
°C to +40°C
× 58 mm × 11 mm
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total
• Design and specifications are subject to change without notice.
• Microsoft and Windows Media are either registered trademarks or trademarks of Microsoft Corporation in the United States and/
or other countries.
• iPod is a trademark of Apple Computer, Inc., registered in the U.S. and other countries.
1-6 (No.MA247)
1.1 Safety Precautions
SECTION 1
PRECAUTIONS
!
!
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
(No.MA247)1-7
1.2 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.
1.2.1 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.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron plate
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.3 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the pickup unit.
(If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
Short-circuit point
(Soldering)
Flexible wire
1-8 (No.MA247)
Pickup
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