Jvc KD-G700 Service Manual

SERVICE MANUAL

CD RECEIVER

MA05020041

KD-G700

Area suffix

J -------------- Northern America

SOUND

ATT

SOURCE

VOL

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

No.MA050

2004/1

SPECIFICATION

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) Equalizer Control Range Low ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)

Mid ±12 dB

High ±12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz) Frequency Response 40 Hz to 20 000 Hz Signal-to-Noise Ratio 70 dB Line-In Level/Impedance KD-AR800 1.5 V/20 kΩ load Line-Out Level/Impedance KD-AR800 5.0 V/20 kΩ load (full scale)

KD-G800 4.0 V/20 kΩ load (full scale)

KD-G700 2.5 V/20 kΩ load (full scale) Output Impedance 1 kΩ Subwoofer-Out Level/Impedance KD-AR800/KD-G800 2.0 V/20 kΩ load (full scale)

TUNER SECTION

Frequency Range FM 87.5 MHz to 107.9 MHz

AM 530 kHz to 1 710 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

Capture Ratio 1.5 dB [AM Tuner] Sensitivity 20 µV

Selectivity 35 dB

CD PLAYER 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

GENERAL Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance) Grounding System Negative ground Allowable Operating Temperature 0ºC to +40ºC (32ºF to 104ºF) Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 159 mm (7-3/16" × 2-1/16" × 6-5/16")

Panel Size (approx.) 188 mm × 58 mm × 12 mm (7-7/16" × 2-5/16" × 1/2")

Mass (approx.) 1.5 kg (3.4 lbs) (excluding accessories)

Design and specifications are subject to change without notice.

1-2 (No.MA050)

1.1 Safety Precautions

SECTION 1

PRECAUTION

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.MA050)1-3

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 dio de) in devices such as CD players. 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 sh eet) 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

Conductive material (conductive sheet) or iron plate

(3) Handling the optical pickup

• In order to maintain quality during transpo rt and before install ation, 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 CD pickup unit.

• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CDpickup 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

1-4 (No.MA050)

Pickup

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MA050)1-5

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly.

(2) Remove the front panel assembly.

3.1.2 Removing the heat sink

(See Fig.2)

(1) From the left side of the main body, remove the two screws

A, two screws B and screw C attaching the heat sink.

Front panel assembly

AAC

Detach button

Fig.1

Heat sink

Fig.2

1-6 (No.MA050)

3.1.3 Removing the top chassis assembly (See Figs.3 to 6)

• Prior to performing the following procedu res, remove the heat

sink.

Reference:

Remove the front panel assembly as required. (1) From the bottom side of the main body, remove the two

screws D attaching the top chassis assembly to the bottom chassis assembly. (See Fig.3.)

(2) From the both and rear sides of the main body, remove the

four screws E attaching the top chassis assembly to the bottom chassis assembly. (See Figs.4 to 6.)

(3) Lift the top chassis asse mbly in the di rection of the arrow ,

disconnect the connector CN501 Figs.5 and 6.)

(4) Take out the top chassis assembly from the bottom chassis

assembly.

on the main board. (See

Bottom chassis assembly

Top chassis assembly

Fig.3

Top chassis assembly

Bottom chassis assembly

Top chassis assembly

Main board

Bottom chassis assembly

CN501

Fig.4

CD mechanism assembly

Bottom chassis assembly

Fig.5

Top chassis assembly

Rear bracket

Fig.6

(No.MA050)1-7

3.1.4 Removing the front chassis (See Figs.7 and 8)

• Prior to performin g the following procedure, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the both sides of the top chassis assembly, remove

the two screws F attaching the front chassis.

Top chassis assembly

Front chassis

Fig.7

Top chassis assembly

Front chassis

Fig.8

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

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the inside of the top chassis assembly, remove the

three screws G attaching the CD mechanism assembly.

(2) Take out the CD mechanism assembly from the top

chassis.

Top chassis

CD mechanism assembly

Fig.9

1-8 (No.MA050)

3.1.6 Removing the main board

(See Figs.10 and 11)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the rear side of the bottom chassis assembly, remove

the two screws H attaching the rear bracket to the bottom chassis assembly. (See Fig.10.)

(2) From the top side of the bottom chassis assembly, remove

the two screws J attaching the main board to the b ottom chassis assembly. (See Fig.11.)

(3) Release the stopper of the connector CN701

board in an upward direction, disconnect the card wire from the connector CN701

(4) Disconnect the wire from the connector of the front door

mechanism assembly. (See Fig.11.)

(5) Disconnect the wire from the connector CN951

board. (See Fig.11.)

Reference:

After connecting the wires, fix the wire with the wire holder.

(6) Take out the main board from the bottom chassis

assembly.

. (See Fig.11.)

on the main

Front door mechanism assembly

Connector

Wire holder

Card wire

Bottom chassis assembly

Fig.10

CN701

Stopper

Rear bracket

Bottom chassis assembly

3.1.7 Removing the rear bracket

(See Fig.12)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) Remove the screw K and three screws L attaching the rear

bracket to the main board.

Main board

CN951

Fig.11

Wires

Rear bracket

Fig.12

(No.MA050)1-9

3.1.8 Removing the front door mechanism assembly (See Fig.13.)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the top side of the bottom chassis assembly, remove

the screw M attaching the FPC guide to the bottom chassis.

(2) Remove the five screws N attaching the front door

mechanism assembly to the bottom chassis.

Reference:

When attaching the screws M and N, apply a locking agent them.

(3) Take out the front door mechanism assembly from the bot-

tom chassis.

Bottom chassis

Front door mechanism assembly

3.1.9 Removing the front board (See Figs.14 to 16)

• Prior to performing the following procedures, remove the front

panel assembly. (1) From the rear side of the front panel assembly, remove the

four screws P attaching the rear cover assembly to the front panel assembly. (See Fig.14.)

(2) Release the twelve joints a of the front panel assembly and

remove the rear cover assembly. (See Fig.15.)

(3) Take out the front board from the front panel assembly.

(See Fig.16.)

Note:

When removing the rear cover assembly and front board, be careful not to lose the comp. spring. (See Fig.16.)

FPC guide

joints a

Fig.13

Rear cover assembly

Fig.14

Rear cover assembly

joints a

1-10 (No.MA050)

joints a

Front panel assembly

Comp. spring

joints a

Fig.15

Front board

Fig.16

3.2 CD Mechanism Assembly

3.2.1 Removing the top cover

(See Figs.1 and 2)

(1) Remove the two screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover

backward to release the two joints a.

Top cover

Joints a

Fig.1

Fig.2

Top cover

(No.MA050)1-11

3.2.2 Removing the connector board (See Figs.3 to 5)

CAUTION:

Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this instruction may cause damage of the pickup. (1) Remove the screw B fixing the connector board. (2) Solder the short-circuit point on the connector board. (3) Disconnect the flexible wire from the pickup. (4) Move the connector board in the direction of the arrow to

release the two joints b.

(5) Unsolder the wire on the connector board if necessary.

CAUTION:

Unsolder the short-circuit point after reassembling.

Connector board

Flexible wire

Wires

Joints b

Short-circuit point

Fig.3

Short-circuit point

(Soldering)

Pickup

Flexible wire

Frame

Pickup

Fig.4

Connector board

Fig.5

1-12 (No.MA050)

3.2.3 Removing the DET switch

(See Figs.6 and 7)

(1) Extend the two tabs c of the feed sw. holder and pull out

the switch.

(2) Unsolder the DET switch wire if necessary.

Connector board

DET switch

Pickup

Fig.6

Tab c

DET switch wire

Tab c

Feed sw. holder

Fig.7

(No.MA050)1-13

3.2.4 Removing the chassis unit

(See Figs.8 and 9)

• Prior to performing the follow ing procedure, remove the top

cover and connector board. (1) Remove the two suspension springs (L) and (R) attaching

the chassis unit to the frame.

CAUTION:

• The shape of the suspension spring (L) and (R) are different. Handle them with care.

• When reassembling, make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly.

Suspension spring (R)

Chassis unit

Suspension spring (L)

Frame

Suspension spring (R)

Chassis unit

Shafts

Damper

Suspension spring (L)

Fig.8

Shaft

Dampe

Frame

Fig.9

1-14 (No.MA050)

3.2.5 Removing the clamper assembly (See Figs.10 and 11)

• Prior to perfo rming the following procedure, remove the top

cover. (1) Remove the clamper arm spring. (2) Move the clamper assembly in the direction of the arrow to

release the two joints d.

Clamper arm spring

Joint d

Clamper assembly

Fig.10

Clamper arm spring

Chassis rivet assembly

Joint d

Clamper assembly

Chassis rivet assembly

Fig.11

Joint d

(No.MA050)1-15

3.2.6 Removing the loading / feed motor assembly (See Figs.12 and 13)

• Prior to performing the follow ing procedure, remove the top

cover, connector board and chassis unit. (1) Remove the screw C and move the loading / feed motor

assembly in the direction of the arrow to remove it from the chassis rivet assembly.

(2) Disconnect the wire from the loading / feed motor assembly

if necessary.

CAUTION:

When reassembling, connect the wire from the loadin g / feed motor assembly to the flame as shown in Fig.12.

Loading / feed motor assembly

Fig.12

Loading / feed motor assembly

Fig.13

1-16 (No.MA050)

3.2.7 Removing the pickup unit

(See Figs.14 to 18)

• Prior to perfo rming the following procedure, remove the top

cover, connector board and chassis unit. (1) Remove the screw D and pull out the pu. shaft holder from

the pu. shaft. (2) Remove the screw E attaching the feed sw. holder. (3) Move the part e of the pickup unit upward with the pu. shaft

and the feed sw. holder, then release the joint f of the feed

sw. holder in the direction of the arrow. The joint g of the

pickup unit and the feed rack is released, and the feed sw.

holder comes off. (4) Remove the pu. shaft from the pickup unit. (5) Remove the screw F attaching the feed rack to the pickup

unit.

3.2.8 Reattaching the pickup unit (See Figs.14 to 17)

(1) Reattach the feed rack to the pickup unit using the screw F. (2) Reattach the feed sw. holder to the feed rack while setting

the joint g to the slot of the feed rack and setting the part f of the feed rack to the switch of the feed sw. holder correctly.

(3) As the feed sw. holder is temporarily attached to the pickup

unit, set to the gear of the joint g and to the bending part of the chassis (joint h) at a time.

CAUTION:

Make sure that the part i on the underside of the feed rack is certainly inserted to the slot j of the change lock

lever. (4) Reattach the feed sw. holder using the screw E. (5) Reattach the pu. shaft to the p ickup uni t. Reattach the pu.

shaft holder to the pu. shaft using the screw D.

Feed sw. holder

Joint f

Joint g

Feed sw. holder

Part e

Feed rack

Pickup unit

Part i

Slot j

Fig.15

Pu. shaft

Pickup unit

Joint f

Joint h

Fig.16

Feed rack

Pickup unit

Feed sw. holder

Pu. shaft holder

Pu. shaft

Pu. shaft holder

Pickup unit

Fig.14

Part e

Joint g

Feed rack

Fig.17

Pickup unit

Joint g

Joint f

Feed sw. holder

Fig.18

(No.MA050)1-17

3.2.9 Removing the trigger arm

(See Figs.19 and 20)

• Prior to performing the follow ing procedure, remove the top cover, connector board and clamper unit. (1) Turn the trigger arm in the direction of the arrow to release

the joint k and pull out upward.

CAUTION:

When reassembling, insert the part m and n of the trigger arm into the part p and q at the slot of the chassis rivet assembly respectively and join the joint k at a time.

Chassis rivet assembly

Trigger arm

Chassis rivet assembly

Joint k

Trigger arm

Fig.19

Part p

Part q

Part m

Part n

3.2.10 Removing the top plate assembly

(See Fig.21)

• Prior to performing the follow ing procedure, remove the top cover, connector board, chassis unit, and clamper assembly. (1) Remove the screw H. (2) Move the top plate assembly in the direction of the arrow to

release the two joints r.

(3) Unsolder the wire marked s if necessary.

Fig.20

Top plate assembly

Joints

Fig.21

1-18 (No.MA050)

3.2.11 Removing the mode sw. / select lock arm (See Figs.22 and 23)

• Prior to perfo rming the following procedure, remove the top

plate assembly. (1) Bring up the mode sw. to release from the link plate (joint t)

and turn in the direction of the arrow to release the joint u. (2) Unsolder the wire of the mode sw. marked s if necessary. (3) Turn the select lock arm in the direction of the arrow to re-

lease the two joints v. (4) The select lock arm spring comes off the select lock arm at

the same time.

Top plate

Link plate

Joint u

Joint t

Fig.22

Select lock arm

Mode sw.

Select lock arm

Top plate

Hook w

Select lock arm spring

Link plate

Joints v

Fig.23

(No.MA050)1-19

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