Page 1
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
Page 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)
Page 3
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
Page 4
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)
Page 5
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
Page 6
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)
Page 7
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
Page 8
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
Page 9
1.5 Important for laser products
!
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The CD,MD and DVD player uses invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. It is
dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified here in may result in
hazardous radiation exposure.
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CAUTION : Visible and Invisible
CLASS 1
LASER PRODUCT
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
(No.MA247)1-9
Page 10
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 DIFFERENT POINT
KD-AR770 KD-G720 KD-G721 KD-G722 KD-G724 KD-G725 KD-G727
SAT READY YES YES NO NO NO NO NO
RDS NO NO YES YES NO NO YES
LINE IN plugYESNONONONONONO
1-10 (No.MA247)
Page 11
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the front panel assembly
(See Fig.1)
(1) Push the detach button in the lower left part of the front
panel assembly and remove the front panel assembly.
3.1.2 Removing the bottom cover
(See Fig.2)
(1) Turn the main body up side down.
(2) Insert a screwdriver under the joints to release the two
joints a on the left side, two joints b on the right side and
joint c on the back side of the main body, then remove the
bottom cover from the main body.
Note:
When releasing the joints using a screwdriver, do not damage
the main board.
Front panel assembly
Detach button
Fig.1
Bottom cover
Joint b
Joint a
3.1.3 Removing the front chassis assembly
(See Figs.3 and 4)
• Remove the front panel assembly and bottom cover.
(1) Remove the two screws A on the both sides of the main
body. (See Fig.3.)
(2) Remove the two screws B on the front sides of the main
body. (See Fig.4.)
(3) Release the joint d and joint e on the both sides of the main
body, then remove the front chassis assembly toward the
front. (See Fig.3.)
Joint a
Joint d
Front chassis assembly
Joint b
Joint c
Fig.2
A
Joint e
Fig.3
Front chassis assembly
B
Fig.4
(No.MA247)1-11
Page 12
3.1.4 Removing the side panel
(See Fig.5)
Reference:
Remove the front panel assembly as required.
(1) Remove the two screws C and three screws D attaching
the side panel on the left side of the main body.
(2) Remove the side panel from the main body.
C
3.1.5 Removing the rear bracket
(See Fig.6)
• Remove the bottom cover.
(1) Remove the screws E, three screws F and two screws G
attaching the rear bracket on the back side of the main
body.
(2) Remove the rear bracket.
Reference:
The quantity of screws E differs by each model.
E
D
F
F
Rear bracket
Rear bracket
Fig.5
G
G
Side panel
FE
FE
1-12 (No.MA247)
E
E
(For KD-AR770)
Rear bracket
F
(For KD-G721 and KD-G722)
G
Fig.6
FE
Page 13
3.1.6 Removing the main board
(See Figs.6 and 7)
• Remove the front panel assembly, bottom cover and side pan-
el.
Reference:
Remove the front chassis assembly as required.
(1) Remove the screws E attaching the rear bracket on the
back side of the main body. (See Fig.6.)
Reference:
The quantity of a screw E differs by each model.
(2) Remove the screw G' attaching the USB board on the front
side of the main body. (See Fig.7.)
(3) Remove the three screws H attaching the main board. (See
Fig.7.)
(4) Disconnect the connector CN501
the main body and take out the main board with the rear
bracket. (See Fig.7.)
Reference:
Remove the rear bracket from the main body as required. (See "3.1.5 Removing the rear bracket".)
on the main board from
H
CN501
G'
USB board
H
3.1.7 Removing the CD mechanism assembly
(See Fig. 8)
• Remove the front panel assembly, bottom cover, side panel,
rear bracket and main board.
Reference:
Remove the front chassis assembly as required.
(1) Remove the three screws J attaching the CD mechanism
assembly on the top chassis.
(2) Take out the CD mechanism assembly.
Rear bracket
CD mechanism assembly
Main board
Fig.7
J
Top chassis
J
Fig.8
(No.MA247)1-13
Page 14
3.1.8 Removing the switch board
(See Figs.9 to 11)
• Remove the front panel assembly.
(1) Remove the five screws K on the back side of the front pan-
el assembly. (See Fig.9.)
(2) Remove the screw M on the right side of the front panel as-
sembly. (See Fig.9.)
(3) Release the joints f and remove the rear cover. (See
Fig.10.)
(4) Take out the switch board from the front panel assembly.
(See Fig.11.)
K
Joints f
Fig.9
Rear cover
Rear cover
M
K
Joints f
Front panel assembly
3.2 CD mechanism section
For the CD mechanism, please refer the mechanism manual TN2001-1118 (No.MY004).
Joints f
Fig.10
Switch board
Fig.11
1-14 (No.MA247)
Page 15
SECTION 4
ADJUSTMENT
4.1 Adjustment method
Test instruments required for adjustment
(1) Digital oscilloscope (100MHz)
(2) Electric voltmeter
(3) Digital tester
(4) Tracking offset meter
(5) Test Disc JVC :CTS-1000
(6) Extension cable for check
EXTSH002-22P × 1
Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
How to connect the extension cable for adjusting
Caution:
Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power.
If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.
Standard measuring conditions
Power supply voltage DC14.4V(11 to 16V)
Load impedance 20KΩ(2 Speakers connection)
Output Level Line out 2.5V (Vol. MAX)
Dummy load
Exclusive dummy load should be used for AM,and FM. For FM
dummy load,there is a loss of 6dB between SSG output and
antenna input.The loss of 6dB need not be considered since
direct reading of figures are applied in this working standard.
Heat sink
Extension cable
EXTSH002-22P
Rear bracket
(No.MA247)1-15
Page 16
5.1 Feed section
SECTION 5
TROUBLESHOOTING
5.2 Focus section
Is 4V present at both
sides of the feed motor?
NO
Is the voltage output at
pin 4 and pin 5 of IC501?
NO
Is the voltage input at pin
28 of IC501?
NO
Is the voltage output at
pin 12 of IC541?
NO
Is the power supply
present at pins 8,16,25,
28,32,53,71 and pin 90
of IC541?
NO
Check the connections
of CD8V power supply.
YES
Check the feed motor.
Check the connections
YES
between the feed motor
and IC501.
Is the power supply
YES YES
present at pin 3, pin 12
and pin 21 of IC501?
NO
Check the connections
of CD8V power supply.
Check the connections
YES
between IC501 and
IC541.
YES
Check IC541.
Check IC501.
When the lens is
moving:
4V
Does the S-search
waveform appear at
IC501 pins 8 and 9?
NO
Is the voltage input at pin
15 of IC501?
NO
Is the voltage output at
pin 9 of IC541?
NO
Is the power supply
present at pins 8,16,25,
28,32,53,71 and pin 90
of IC541?
NO
Check the connections
of CD8V power supply.
YES
YES
YES
YES
Check the pickup and
its connections.
Is the power supply
present at pin 3, pin 12
and pin 21 of IC501?
Check the connections
of CD8V power supply.
Check the connections
between IC501 and
IC541.
Check IC541.
YES
Check IC501.
NO
1-16 (No.MA247)
Page 17
5.3 Spindle section
Is the disk rotated?
NO
Is the voltage output at
pin 6 and pin 7 of IC501?
NO
Is the voltage input at pin
17 of IC501?
NO
Is the voltage output at
pin 13 of IC541?
NO
Is the power supply
present at pins 8,16,25,
28,32,53,71 and pin 90
of IC541?
NO
YES
Does the RF signal appear
at pin 83 of IC541?
YES
Check the spindle motor
and its wiring.
Is the power supply
YES
present at pin 3, pin 12
and pin 21 of IC501?
Check the connections
of CD8V power supply.
Check the connections
YES
between IC501 and
IC541.
YES
Check IC541.
NO
YES
YES
Is the RF waveform at
pin 83 of IC541 distorted?
NONO
Check the circuits in
the vicinity of IC541
or the pickup.
Check IC501.
YES
Proceed to the Tracking
section.
Check the connections
of CD8V power supply.
5.4 Tracking section
When the disc is rotated
at first:
Approx. 1.2V
Is the tracking error
signal output at pin 6
of IC541?
NO
Check the pickup and
its connections.
Replace IC541 or repair
YES
the malfunction
connection point.
(No.MA247)1-17
Page 18
5.5 Signal processing section
Is the sound output from
both channels (L, R)?
NO
No sound from either
channel.
NO
Compare the L-ch and
R-ch to locate the
defective point.
5.6 Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the following
symptoms will appear.
• The level of RF output (EFM output: amplitude of eye
pattern) will be low.
YES
Normal
YES
Is 9V present at pin 24
of IC161?
Is 9V present at pin 13
of IC901?
Check IC901 and its
peripheral circuits.
NO
NO
Is the audio signal
(including sampling
YES
output components)
output to pins 1 and 7 of
IC581 during playback?
NO
Check IC581 and its
peripheral circuits.
Check the connections
YES
between pin 24 of IC161
and pin 13 of IC901.
5.7 Replacement of laser pickup
Turn off the power switch and disconnect the
power cord.
Replace the pickup with a normal one. (Refer
to "Removing the pickup unit" on the previous page.)
Is the audio signal output
YES
at pin 18 and pin 19 of
IC161 during playback?
Check IC161 and its
peripheral circuits.
Check the power
amplifier IC301.
NO
YES
Is RF output
1.3 0.4Vp-p?
NO
Replace it.
YES
OK
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power.Since this adjustment should be performed to match
the characteristics of the whole optical block, do not touch
the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should
be replaced. If the semi-fixed resistor is adjusted while the
pickup is functioning normally, the laser pickup may be
damaged due to excessive current.
Plug the power cord in and turn the power on.
At this time, check that the laser emits for about
seconds and the objective lens moves up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at
RF test point or
ARF test point.
Finish.
1-18 (No.MA247)
Page 19
5.8 16 PIN CORD DIAGRAM (for KD-AR770)
8
7
6
BL/WH
5
4
3
2
1
BK
RD
NC
YL
OR/WH
NC
BR
WH
GN
VI
GY
WH/BK
GN/BK
VI/BK
GY/BK
16 YL
8 BK
7 RD
15 OR/WH
13 BR TEL
5 BL/WH
3 GN
16
15
14
13
12
11
10
9
MEMORY
GND
ACC
ILL
REMOTE
RL+
BK
RD
BL
WH
BR
CAUTION!
REMOTE
ONLY
OUTPUT
Black
Red
Blue
White
Brown
GN
VI
GY
YL
OR
Green
Violet
Gray
Yellow
Orange
GND
11 GN/BK
10 VI/BK
12 WH/BK
RR
FR
FL
RL
TEL
2 VI
4 WH
1 GY
9 GY/BK
Rear Right
Front Right
Front Left
Rear Left
Telephone muting
RL-
RR+
RR-
FL+
FL-
FR+
FR-
REMOTE
ACC
MEMORY
GND
ILL
Remote out
ACC Line
Memory Backup Battery +
Ground
Illuminations Control
(No.MA247)1-19
Page 20
5.9 16 PIN CORD DIAGRAM (for KD-G720)
8
7
6
BL/WH
5
4
3
2
1
BK
RD
NC
WH
GN
VI
GY
YL
OR/WH
NC
NC
WH/BK
GN/BK
VI/BK
GY/BK
16 YL
8 BK
7 RD
15 OR/WH
5 BL/WH
3 GN
16
15
14
13
12
11
10
9
MEMORY
GND
ACC
ILL
REMOTE
RL+
BK
RD
BL
WH
REMOTE
CAUTION!
ONLY
OUTPUT
Black
Red
Blue
White
GN
VI
GY
YL
OR
Green
Violet
Gray
Yellow
Orange
GND
11 GN/BK
2 VI
10 VI/BK
4 WH
12 WH/BK
1 GY
9 GY/BK
RR
FR
FL
RL
Rear Right
Front Right
Front Left
Rear Left
RL-
RR+
RR-
FL+
FL-
FR+
FR-
REMOTE
ACC
MEMORY
GND
ILL
Remote out
ACC Line
Memory Backup Battery +
Ground
Illuminations Control
1-20 (No.MA247)
Page 21
5.10 16 PIN CORD DIAGRAM (for KD-G721,KD-G722,KD-G727)
8
7
6
BL/WH
5
WH
4
3
GN
2
GY
1
7 RD
16 YL
15 OR/WH
8 BK
6 BL/WH
13 BR
BK
RD
NC
VI
YL
OR/WH
NC
BR
WH/BK
GN/BK
VI/BK
GY/BK
16
15
14
13
12
11
10
9
ACC
MEMORY
ILL
GND
REMOTE
TEL
BK
RD
BL
WH
BR
Black
Red
Blue
White
Brown
GN
VI
GY
YL
OR
Green
Violet
Gray
Yellow
Orange
RD
1
3
5
7
RD 7
YL 4
BL/WH
6
8
5
2
NC
NC
RD
BR
YL
OR/WH
BK
2
4
6
8
RR
FR
FL
3 GN
11 GN/BK
2 VI
10 VI/BK
4 WH
12 WH/BK
1 GY
9 GY/BK
Rear Right
Front Right
Front Left
RL+
RL-
RR+
RR-
FL+
FL-
FR+
FR-
ANT
ACC
TEL
Auto Antenna
ACC Line
Telephone Muting
7
8
1
2
5
6
3
4
VI/BK
GY/BK
WH/BK
GN/BK
2
4
6
8
VI
1
3
GY
5
WH
GN
7
RL
REMOTE
ILL
Rear Left
Remote
Illuminations Control
GND
MEMORY
Ground
Memory Backup Battery+
(No.MA247)1-21
Page 22
5.11 16 PIN CORD DIAGRAM (for KD-G724,KD-G725)
1
8
7
6
5
4
3
2
BK
RD
BL
BL/WH
WH
GN
VI
GY
YL
OR/WH
NC
BR
WH/BK
GN/BK
VI/BK
GY/BK
16 YL
8 BK
7 RD
15 OR/WH
13 BR
3 GN
10
16
15
14
13
12
11
BK
RD
BL
Black
Red
Blue
WH White
BR
9
MEMORY
GND
ACC
ILL
TEL
RL+
Brown
GN
Green
VI Violet
GY
YL
Gray
Yellow
OR Orange
GND
RR
FR
11 GN/BK
2 VI
10 VI/BK
4 WH
12 WH/BK
1 GY
9 GY/BK
5 BL/WH
6 BL
Rear Right
Front Right
RL-
RR+
RR-
FL+
FL-
FR+
FR-
REMOTE
ANT
REMOTE
CAUTION!
POWER
ANT
ACC
OUTPUT ONLY
ANTENNA
Auto Antenna
ACC Line
FL
RL
REMOTE
TEL
1-22 (No.MA247)
Front Left
Rear Left
Remote out
Telephone muting
ILL
GND
MEMORY
Illuminations Control
Ground
Memory Backup Battery+
Page 23
(No.MA247)1-23
Page 24
Victor Company of Japan, Limited
Mobile Entertainment Business Group Mobile Entertainment Category 10-1,1chome,Ohwatari-machi,Maebashi-city,Gumma-ken, 371-8543,Japan
(No.MA247)
Printed in Japan
VPT
Loading...