JVC KDAR-870, KDG-820-J, KDG-821-E, KDG-821-EU, KDG-821-EX Service manual

SERVICE MANUAL

CD RECEIVER

KD-AR870J,KD-G820J,KD-G821E, KD-G821EX,KD-G821EY,KD-G821EU, KD-G824UI,KD-G825U,KD-G825UN, KD-G825UH,KD-G825UT,KD-G827EE

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.MA249

2006/2

SPECIFICATION

KD-AR870/KD-G820

	AUDIO AMPLIFIER SECTION
Power Output		20 W RMS × 4 Channels at 4 Ω			and [< or =] 1% THD+N
Signal to Noise Ratio		80 dBA (reference: 1 W into 4 Ω			)
Load Impedance		4 Ω (4 Ω	to 8 Ω allowance)
Tone Control Range	Low	±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)
	Mid	±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
	High	±12 dB (10 kHz, 12.5 kHz, 15 kHz,17.5 kHz)
Frequency Response		40 Hz to 20 000 Hz
Line-In Level/Impedance	KD-AR870	1.5V/20kΩ	load
Line-Out Level/Impedance	KD-AR870	5.0 V/20 kΩ load (full scale)
	KD-G820	4.0 V/20 kΩ load (full scale)
Output Impedance		1 kΩ
Subwoofer-Out Level/Impedance		2.0 V/20 kΩ load (full scale)
Other Terminals		CD changer, LINE IN (for KD-AR870)
	TUNER SECTION
Frequency Range	FM	87.5 MHz to 107.9 MHz (with channel interval set to 100 kHz or 200 kHz)
		87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)
	AM	530 kHz to 1 710 kHz (with channel interval set to 10 kHz)
		531 kHz to 1 602 kHz (with channel interval set to 9 kHz)
FM Tuner	Usable Sensitivity	11.3 dBf (1.0 µV/75 Ω )
	50 dB Quieting Sensitivity	16.3 dBf (1.8 µV/75 Ω )
	Alternate Channel Selectivity (400 kHz)	65 dB
	Frequency Response	40 Hz to 15 000 Hz
	Stereo Separation	35 dB
AM Tuner	Sensitivity	20 µV
	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
		Max. Bit Rate : 320 kbps
WMA (Windows Media® Audio) Decoding		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°C to +40°C (32°F to 104°F)
Dimensions (W × H × D)	Installation Size (approx.)	182 mm ×	52 mm ×	152 mm (7-3/16" ×		2-1/16" ×	6")
	Panel Size (approx.)	188 mm ×	58 mm ×	11 mm (7-7/16" ×		2-5/16" ×	7/16")
Mass (approx.)		1.4 kg (3.1 lbs) (excluding accessories)

1-2 (No.MA249)

KD-G821

		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 Ω , 40 Hz to 20 000 Hz at no more than 0.8% total
			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 Ω (4 Ω	to 8 Ω allowance)
Tone Control Range		Low	±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)
		Mid	±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
		High	±12 dB (10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz)
Frequency Response			40 Hz to 20 000 Hz
Signal-to-Noise Ratio			70 dB
Line-Out Level/Impedance			5.0 V/20 kΩ load (full scale)
Output Impedance			1 kΩ
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
			(LW) 144 kHz to 279 kHz
FM Tuner		Usable Sensitivity	11.3 dBf (1.0 µV/75 Ω )
		50 dB Quieting Sensitivity	16.3 dBf (1.8 µV/75 Ω )
		Alternate Channel Selectivity (400 kHz)	65 dB
		Frequency Response	40 Hz to 15 000 Hz
		Stereo Separation	30 dB
MW Tuner		Sensitivity	20 µV
		Selectivity	35 dB
LW Tuner		Sensitivity	50 µV
		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
			Max. Bit Rate : 320 kbps
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°C to +40°C
Dimensions (W × H × D)		Installation Size (approx.)	182 mm ×	52 mm ×	152 mm
		Panel Size (approx.)	188 mm ×	58 mm ×	11 mm
Mass (approx.)			1.4 kg (excluding accessories)

(No.MA249)1-3

KD-G824

		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 Ω , 40 Hz to 20 000 Hz at no more than 0.8% total
			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 Ω (4 Ω	to 8 Ω allowance)
Tone Control Range		Low	±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)
		Mid	±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
		High	±12 dB (10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz)
Frequency Response			40 Hz to 20 000 Hz
Signal-to-Noise Ratio			70 dB
Line-Out Level/Impedance			5.0 V/20 kΩ load (full scale)
Output Impedance			1 kΩ
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 µV/75 Ω )
		50 dB Quieting Sensitivity	16.3 dBf (1.8 µV/75 Ω )
		Alternate Channel Selectivity (400 kHz)	65 dB
		Frequency Response	40 Hz to 15 000 Hz
		Stereo Separation	30 dB
AM Tuner		Sensitivity	20 µV
		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
			Max. Bit Rate : 320 kbps
WMA (Windows Media® Audio) Decoding			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°C to +40°C
Dimensions (W × H × D)		Installation Size (approx.)	182 mm ×	52 mm ×	152 mm
		Panel Size (approx.)	188 mm ×	58 mm ×	11 mm
Mass (approx.)			1.4 kg (excluding accessories)

1-4 (No.MA249)

KD-G825

		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 Ω , 40 Hz to 20 000 Hz at no more than 0.8% total
			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 Ω (4 Ω	to 8 Ω allowance)
Tone Control Range		Low	±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)
		Mid	±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
		High	±12 dB (10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz)
Frequency Response			40 Hz to 20 000 Hz
Signal-to-Noise Ratio			70 dB
Line-Out Level/Impedance			5.0 V/20 kΩ load (full scale)
Output Impedance			1 kΩ
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 µV/75 Ω )
		50 dB Quieting Sensitivity	16.3 dBf (1.8 µV/75 Ω )
		Alternate Channel Selectivity (400 kHz)	65 dB
		Frequency Response	40 Hz to 15 000 Hz
		Stereo Separation	30 dB
AM Tuner		Sensitivity	20 µV
		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
			Max. Bit Rate : 320 kbps
WMA (Windows Media® Audio) Decoding			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°C to +40°C
Dimensions (W × H × D)		Installation Size (approx.)	182 mm ×	52 mm ×	152 mm
		Panel Size (approx.)	188 mm ×	58 mm ×	11 mm
Mass (approx.)			1.4 kg (excluding accessories)

(No.MA249)1-5

KD-G827

		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 Ω , 40 Hz to 20 000 Hz at no more than 0.8% total
			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 Ω (4 Ω	to 8 Ω allowance)
Tone Control Range		Low	±12 dB (60 Hz, 80 Hz, 100 Hz, 200 Hz)
		Mid	±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)
		High	±12 dB (10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz)
Frequency Response			40 Hz to 20 000 Hz
Signal-to-Noise Ratio			70 dB
Line-Out Level/Impedance			5.0 V/20 kΩ load (full scale)
Output Impedance			1 kΩ
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
			(LW) 144 kHz to 279 kHz
FM Tuner		Usable Sensitivity	11.3 dBf (1.0 µV/75 Ω )
		50 dB Quieting Sensitivity	16.3 dBf (1.8 µV/75 Ω )
		Alternate Channel Selectivity (400 kHz)	65 dB
		Frequency Response	40 Hz to 15 000 Hz
		Stereo Separation	30 dB
MW Tuner		Sensitivity	20 µV
		Selectivity	35 dB
LW Tuner		Sensitivity	50 µV
		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
			Max. Bit Rate : 320 kbps
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°C to +40°C
Dimensions (W × H × D)		Installation Size (approx.)	182 mm ×	52 mm ×	152 mm
		Panel Size (approx.)	188 mm ×	58 mm ×	11 mm
Mass (approx.)			1.4 kg (excluding accessories)

•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.MA249)

SECTION 1

PRECAUTIONS

1.1Safety 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.MA249)1-7

1.2Preventing 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.

1.2.1Grounding 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.

1.3Handling 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.

1.4Attention 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

Pickup

1-8 (No.MA249)

1.5Important 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

CLASS 1

LASER PRODUCT

CAUTION : Visible and Invisible 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.MA249)1-9

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 DIFFERENT POINT

	KD-AR870	KD-G820	KD-G821	KD-G824	KD-G825	KD-G827
LINE IN	YES	NO	NO	NO	NO	NO
RDS	NO	NO	YES	NO	NO	NO
STEERING WHEEL REMOTE INPUT	NO	NO	YES	NO	NO	NO

1-10 (No.MA249)

SECTION 3

DISASSEMBLY

3.1Main body section

3.1.1Removing the front panel assembly (See Fig.1)

(1)Push the control panel release button in the lower left part of the front panel assembly and remove the front panel assembly.

(2)Take out the front panel assembly.

3.1.2Removing the bottom cover (See Fig.2)

(1)Turn the main body up side down.

(2)Insert a screwdriver under the joints to release the joints a on the left side, 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.

Caution:

When releasing the joints using a screwdriver, do not damage the main board.

Front panel assembly

Control panel release button

Fig.1

Bottom cover

b

a

b

a c

Fig.2

(No.MA249)1-11

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 front side of the main body. (See Fig.3)

(2)Remove the two screws B on the both sides of the main body. (See Fig.4)

(3)Release the joints d and joints e on the both sides of the main body, and then remove the front chassis assembly toward the front. (See Fig.4)

3.1.4Removing 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)Take out the side panel from the main body.

Front chassis assembly

A

Fig.3

B B

d	e

Front chassis assembly

Fig.4

C D D C

Side panel D

Fig.5

1-12 (No.MA249)

3.1.5Removing the rear bracket

(See Fig.6) [For KD-AR870, KD-G820 and KD-G821]

•Remove the bottom cover.

(1)Remove the four screws E, two screws F and two screws G attaching the rear bracket on the back side of the main body.

(2)Take out the rear bracket.

3.1.6 Removing the rear bracket

(See Fig.6) [For KD-G824, KD-G825 and KD-G827]

•Remove the bottom cover.

(1)Remove the three screws E, three screws F and two screws G attaching the rear bracket on the back side of the main body.

(2)Take out the rear bracket.

3.1.7Removing the main board (See Figs.6 to 8)

•Remove the front panel assembly, bottom cover, front chassis assembly and side panel.

(1)Remove the four screws E for KD-AR870, KD-G820 and KD-G821 or three screws E for KD-G824, KD-G825 and KD-G827 attaching the rear bracket on the back side of the main body. (See Fig.6.)

(2)Remove the three screws H attaching the main board. (See Fig.7)

(3)Disconnect the connector CN501 and take out the main board. (See Fig.7)

(4)Remove the one screw J attaching the USB board. (See Fig.8)

Reference:

Remove the rear bracket as required.

for KD-AR870, KD-G820, KD-G821
F Rear bracket G	F

E						E		E
for KD-G824, KD-G825,KD-G827
	F Rear bracket G						F

E E

Fig.6

Main board

H H

H

CN501	Rear bracket

Fig.7

CD mechanism assembly

Main board

Fig.8

J

(No.MA249)1-13

3.1.8 Removing the CD mechanism assembly (See Fig.9)

•Remove the front panel assembly, bottom cover, front chassis assembly, side panel, main board and CD mechanism control board.

(1)Remove the three screws K attaching the top chassis.

(2)Take out the CD mechanism assembly.

3.1.9 Removing the switch board (See Figs.10 to 13)

•Remove the front panel assembly.

(1)Release the main volume knob from the front panel assembly. (See Fig.10)

(2)Remove the five screws L and one screw M attaching the front panel assembly. (See Fig.11)

(3)Release the nine joints f and take out the rear cover. (See Fig.12)

(4)Lift the switch board from the front panel assembly little by little and take out the switch board. (See Fig.13)

K

CD mechanism assembly		Top chassis
		Fig.9
Volume knob	Front panel assembly

Fig.10

L

M

Rear cover

Fig.11

f	Rear cover		f

f

Fig.12

Switch board

Fig.13

3.2CD mechanism section

For the CD mechanism, please refer the mechanism manual TN2001-1118 (No.MY004).

1-14 (No.MA249)

SECTION 4 ADJUSTMENT

4.1Adjustment 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

Standard measuring conditions
Power supply voltage	DC14.4V(11 to 16V)
Load impedance	20KΩ (2 Speakers connection)
Output Level KD-ARXXX	Line out 4.0V	(Vol. MAX)
KD-GXXX	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.

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.

EXTSH002-22P

Side panel

Rear bracket

CN501

(No.MA249)1-15

SECTION 5

TROUBLESHOOTING

5.1Feed section

	Is 4V present at both		YES
	sides of the feed motor?
		NO
			YES
	Is the voltage output at
	pin 4 and pin 5 of IC501?
		NO

Is the voltage input at pin YES 28 of IC501?

		NO
			YES
	Is the voltage output at
	pin 12 of IC541?
		NO

Is the power supply

present at pins 8,16,25, YES 28,32,53,71 and pin 90

of IC541?

NO

Check the connections of CD8V power supply.

5.2Focus section

When the lens is moving:

4V YES

Does the S-search waveform appear at IC501 pins 8 and 9?

NO

Is the voltage input at pin YES 15 of IC501?

NO

Is the voltage output at		YES
pin 9 of IC541?
	NO

Is the power supply

present at pins 8,16,25, YES 28,32,53,71 and pin 90

of IC541?

NO

Check the connections of CD8V power supply.

Check the feed motor.

Check the connections between the feed motor and IC501.

Is the power supply present at pin 3, pin 12 and pin 21 of IC501?

NO

Check the connections of CD8V power supply.

Check the connections between IC501 and IC541.

Check IC541.

Check the pickup and its connections.

Is the power supply present at pin 3, pin 12 and pin 21 of IC501?

NO

Check the connections of CD8V power supply.

Check the connections between IC501 and IC541.

Check IC541.

YES

Check IC501.

YES

Check IC501.

1-16 (No.MA249)

5.3Spindle section

YES Is the disk rotated?

		NO
			YES
	Is the voltage output at
	pin 6 and pin 7 of IC501?

NO

Is the voltage input at pin YES 17 of IC501?

NO

Is the voltage output at		YES
pin 13 of IC541?
	NO

Does the RF signal appear

YES

Is the RF waveform at

at pin 83 of IC541?

pin 83 of IC541 distorted?

NO

NO

YES

Check the spindle motor

Check the circuits in

Proceed to the Tracking

and its wiring.

the vicinity of IC541

section.

or the pickup.

Is the power supply

YES

Check IC501.

present at pin 3, pin 12

and pin 21 of IC501?

NO

Check the connections

of CD8V power supply.

Check the connections

between IC501 and

IC541.

Is the power supply

present at pins 8,16,25, YES

Check IC541.

28,32,53,71 and pin 90 of IC541?

NO

Check the connections of CD8V power supply.

5.4Tracking section

When the disc is rotated at first:

Approx. 1.2V YES Replace IC541 or repair

the malfunction

connection point.

Is the tracking error signal output at pin 6 of IC541?

NO

Check the pickup and its connections.

(No.MA249)1-17

5.5Signal processing section

	Is the sound output from		YES		Normal
	both channels (L, R)?
		NO
			YES				YES
	No sound from either				Is 9V present at pin 24
	channel.				of IC161?

NO

Compare the L-ch and R-ch to locate the defective point.

NO

Is 9V present at pin 13		YES
of IC901?
	NO
Check IC901 and its
peripheral circuits.

	Is the audio signal
	(including sampling		YES			Is the audio signal output
	output components)					at pin 18 and pin 19 of
	output to pins 1 and 7 of					IC161 during playback?
	IC581 during playback?
		NO						NO
	Check IC581 and its					Check IC161 and its
	peripheral circuits.					peripheral circuits.
	Check the connections
	between pin 24 of IC161
	and pin 13 of IC901.							YES
							Check the power
							amplifier IC301.

5.6Maintenance 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.

	Is RF output	NO
		Replace it.
	1.3 0.4Vp-p?

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.

5.7Replacement 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.)

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.MA249)

5.816P CORD DIAGRAM (for KD-AR870)

8	BK		YL	16
7	RD		OR/WH 15
6	NC		NC	14	BK	Black	GN	Green
5	BL/WH		BR	13	RD	Red	VI	Violet
					BL	Blue	GY	Gray
4	WH		WH/BK 12		WH	White	YL	Yellow
3	GN		GN/BK 11		BR	Brown	OR	Orange
2	VI		VI/BK 10
1	GY		GY/BK	9
		16	YL		MEMORY
		8 BK			GND
		7 RD			ACC			GND
		15	OR/WH		ILL
		13 BR			TEL
		5 BL/WH			REMOTE
					CAUTION!
					REMOTE OUTPUTONLY
		3 GN			RL+
		11 GN/BK			RL-
		2	VI		RR+
		10	VI/BK		RR-
		4 WH			FL+
		12	WH/BK		FL-
		1	GY		FR+
		9	GY/BK		FR-

RR	Rear Right	REMOTE	Remote out
FR	Front Right	ACC	ACC Line
FL	Front Left	MEMORY	Memory Backup Battery +
RL	Rear Left	GND	Ground
TEL	Telephone muting	ILL	Illuminations Control

(No.MA249)1-19

5.916 PIN CORD DIAGRAM (for KD-G820)

8	BK		YL	16
7	RD		OR/WH 15
6	NC		NC	14	BK	Black	GN	Green
5 BL/WH			NC	13	RD	Red	VI	Violet
					BL	Blue	GY	Gray
4	WH		WH/BK 12		WH	White	YL	Yellow
3	GN		GN/BK 11				OR	Orange
2	VI		VI/BK 10
1	GY		GY/BK	9
		16	YL		MEMORY
		8 BK			GND
		7 RD			ACC			GND
		15	OR/WH		ILL
		5 BL/WH			REMOTE
					CAUTION!
					REMOTE OUTPUTONLY
		3 GN			RL+
		11 GN/BK			RL-
		2	VI		RR+
		10	VI/BK		RR-
		4 WH			FL+
		12	WH/BK		FL-
		1	GY		FR+
		9	GY/BK		FR-

RR	Rear	Right	REMOTE	Remote out
FR	Front	Right	ACC	ACC Line
FL	Front	Left	MEMORY	Memory Backup Battery +
RL	Rear	Left	GND	Ground
			ILL	Illuminations Control

1-20 (No.MA249)

5.10 16 PIN CORD DIAGRAM (for KD-G821,KD-G827)

8

BK

YL

16

BK

Black

GN

Green

7

RD

OR/WH

15

RD

Red

VI

Violet

6

NC

NC

14

BL

Blue

GY

Gray

5

BL/WH

BR

13

WH

White

YL

Yellow

4

WH

WH/BK

12

BR

Brown

OR

Orange

3

GN

GN/BK

11

2

VI

VI/BK

10

1

NC

BR

2

1

GY

GY/BK

9

3

NC

YL

4

5

BL/WH OR/WH

6

7

RD

BK

8

			RD
7	RD	ACC	RD	7
16	YL	MEMORY	YL	4
15	OR/WH	ILL		6
8	BK	GND		8
6	BL/WH	REMOTE		5
13	BR	TEL		2
3	GN	RL+		7
11	GN/BK	RL-		8
2	VI	RR+		1
10	VI/BK	RR-		2
4	WH	FL+		5
12	WH/BK	FL-		6
1	GY	FR+		3
9	GY/BK	FR-		4

				1	VI	VI/BK
				3	GY	GY/BK
RR	Rear Right	ANT	Auto Antenna	5	WH WH/BK
FR	Front Right	ACC	ACC Line	7	GN	GN/BK
FL	Front Left	TEL	Telephone Muting
RL	Rear Left	GND	Ground
REMOTE	Remote	MEMORY	Memory Backup Battery+

2

4

6

8

ILL	Illuminations Control

(No.MA249)1-21

5.11 16 PIN CORD DIAGRAM (for KD-G824,KD-G825)

8

BK

YL

16

7

RD

OR/WH 15

BK

Black

GN

Green

NC

6

BL

14

RD

Red

VI

Violet

5

BL/WH

BR

13

BL

Blue

GY

Gray

4

WH

WH/BK

12

WH

White

YL

Yellow

BR

Brown

OR

Orange

3

GN

GN/BK

11

2

VI

VI/BK

10

1

GY

GY/BK

9

MEMORY

16

YL

8 BK

GND

7 RD

ACC

GND

15

OR/WH

ILL

13

BR

TEL

3 GN

RL+

11 GN/BK

RL-

2

VI

RR+

10

VI/BK

RR-

4 WH

FL+

FL-

12

WH/BK

1

GY

FR+

9

GY/BK

FR-

5 BL/WH

REMOTE

CAUTION!REMOTE

6 BL

ANT

OUTPUT ONLY

POWER

ANTENNA

	RR	Rear	Right	ANT	Auto	Antenna
	FR	Front	Right	ACC	ACC	Line
	FL	Front	Left	ILL	Illuminations Control
	RL	Rear	Left	GND	Ground
	REMOTE	Remote out		MEMORY Memory Backup Battery+
	TEL	Telephone muting

1-22 (No.MA249)

(No.MA249)1-23

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.MA249)

Printed in Japan VPT