JVC KD-G300, AR300 Service Manual

SERVICE MANUAL

CD RECEIVER

MA03620041

KD-G300, KD-AR300

KD-AR300

KD-G300

Area Suffix

J ----- Northern America

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

No.MA036

2004/1

SPECIFICATION

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output (RMS)

Load Impedance 4 Ω (4 Ω to 8 Ω allowance) Tone Control Range Bass ±10 dB at 100 Hz

Frequency Response 40 Hz to 20 000 Hz Signal-to-Noise Ratio 70 dB Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale) Output Impedance 1 kΩ

Frequency Range FM 87.5 MHz to 107.9 MHz

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

[AM Tuner] Sensitivity 20 µV

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

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 × 150 mm (7-3/16" × 2-1/16" × 5-15/16")

Mass (approx.) 1.4 kg (3.1 lbs) (excluding accessories)

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.

Treble ±10 dB at 10 kHz

TUNER SECTION

AM 530 kHz to 1 710 kHz

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

Selectivity 35 dB

CD PLAYER SECTION

Max. Bit Rate: 320 Kbps

GENERAL

Panel Size (approx.) 188 mm × 58 mm × 11 mm (7-7/16" × 2-5/16" × 7/16")

Design and specifications are subject to change without notice.

1-2 (No.MA036)

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.MA036)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 orde r to maintain quality during tra nsport 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.MA036)

Pickup

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MA036)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 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

Joint a

Detach button

Fig.1

Bottom cover

Joint b

3.1.3 Removing the front chassis assembly

(See Fig.3)

• Prior to performing the following procedures, remove the front panel assembly and bottom cover. (1) Remove the two screws A on the both sides of the main

body.

(2) Release the two joints d and two joints e on the both sides

of the main body, then remove the front chassis assembly toward the front.

Joint a

Joint c

Fig.2

Joint d Joint e

Joint d

Front chassis assembly

Fig.3

Joint e

Joint b

1-6 (No.MA036)

3.1.4 Removing the side panel (See Fig.4)

• Prior to p erforming the following procedure, remove the front

panel assembly as required. (1) Remove the screw B and two screws C attaching the side

panel on the left side of the main body, and remove the side panel.

3.1.5 Removing the rear bracket (See Fig.5)

• Prior to performing the following procedure, remove the bottom

cover. (1) Remove the three screws D, three screws E and two

screws F attaching the rear bracket on the back side of the main body.

(2) Remove the screw F’ attaching the rear bracket on the

back side of the main body. (KD-AR300J)

(3) Remove the rear bracket.

Side panel

Fig.4

Rear bracket

3.1.6 Removing the main board (See Figs.5 and 6)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover and side panel.

• Remove the front chassis assembly as required.

(1) Remove the three screws D attaching the rear bracket on

the back side of the main body. (See Fig.5.)

(2) Remove the two screws G attaching the main board. (See

Fig.6.)

(3) Disconnect the connector CN501

the main body and take out the main board with the rear bracket. (See Fig.6.)

Reference:

Remove the rear bracket from the main body as required. (See “3.1.5 Removing the rear bracket”.)

on the main board from

CN501

Fig.5

Fig.6

Main board

(No.MA036)1-7

3.1.7 Removing the CD mechanism assembly (See Fig. 7)

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

panel assembly, bottom cover, side panel, rear bracket and main board.

• Remove the front chassis assembly as required.

(1) Remove the three screws H attaching the CD mechanism

assembly on the top chassis.

(2) Take out the CD mechanism assembly.

3.1.8 Removing the front board (See Figs.8 to 10)

• Prior to performing the following procedures, remove the front

panel assembly. (1) Remove the four screws J on the back side of the front pan-

el assembly. (See Fig.8.)

(2) Release the ten joints f and remove the rear cover. (See

Fig.9.)

(3) Release the joint g and take out the front board from the

front panel assembly. (See Fig.10.)

CD mechanism assembly

Joint f

Top chassis

Fig.7

Fig.8

Joints f

Rear cover

1-8 (No.MA036)

Joints f

Front board

Joints f

Fig.9

Joint g

Fig.10

Joint f

Front panel assembly

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.MA036)1-9

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

1-10 (No.MA036)

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.MA036)1-11

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

1-12 (No.MA036)

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

• Prior to p erforming 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.MA036)1-13

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

1-14 (No.MA036)

3.2.7 Removing the pickup unit

(See Figs.14 to 18)

• Prior to p erforming 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

Part i

Pickup unit

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.MA036)1-15

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

1-16 (No.MA036)

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

• Prior to p erforming 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.MA036)1-17

3.2.12 Reassembling the mode sw. / select lock arm (See Figs.24 to 26)

REFERENCE:

Reverse the above removing procedure. (1) Reattach the select lock arm spring to the top plate and set

the shorter end of the select lock arm spring to the hook w on the top plate.

(2) Set the other longer end of the select lock arm spring to the

boss x on the underside of the select lock arm, and join the select lock arm to the slots (joint v). Turn the select lock arm as shown in the figure.

(3) Reattach the mode sw. whil e setting the part t to the first

peak of the link plate gear, and join the joint u.

CAUTION:

When reattaching the mode sw., check if the points y and z are correctly fitted and if each part operates properly.

Select lock arm spring

Hook w

Joint v

Select lock arm

Boss x

Fig.24

Joint t

Point y

Link plate

Point z

Link plate

Fig.25

Mode sw.

Select lock arm

Joint t

Joint u

Fig.26

1-18 (No.MA036)

3.2.13 Removing the select arm R / link plate

(See Figs.27 and 28)

• Prior to p erforming the following procedure, remove the top

plate assembly. (1) Bring up the select arm R to release from the link plate

(joint a') and turn as shown in the figure to release the two joints b' and joint c'.

(2) Move the link plate in the direction of the arrow to release

the joint d'. Remove the link plate spring at the same time.

REFERENCE:

Before removing the link plate, remove the mode sw..

Select arm R

Joint b'

Link plate spring

Joint c'

Joint a'

Link plate

Joint b'

Fig.27

Joint r

3.2.14 Reattaching the Select arm R / link plate

(See Figs.29 and 30)

REFERENCE:

Reverse the above removing procedure. (1) Reattach the link plate spring. (2) Reattach the link plate to the link plate spring wh ile j oining

them at joint d'.

(3) Reattach the joint a' of the select arm R to the first peak of

the link plate while joining the two joints b' with the slots. Then turn the select arm R as shown in the figure. The top plate is joined to the joint c'.

CAUTION:

When reattaching the sele ct arm R, check if the points e' and f' are correctly fitted and if each part operates properly.

Top plate

Select arm R

Joint b'

Joint d'

Link plate

Fig.28

Link plate spring

Joint c'

Joint d'

Joint b'

Joint a'

Fig.29

Joint a'

Point e'

Link plate

Point f'

Fig.30

(No.MA036)1-19

3.2.15 Removing the loading roller assembly (See Figs.31 to 33)

• Prior to performing the following procedure, remove the

clamper assembly and top plate assembly. (1) Push inward the loading roller a ssembly on the gear side

and detach it upward from the slot of the joint g' of the lock arm rivet assembly.

(2) Detach the loading roller assembly from the slot of the joint

h' of the lock arm rivet assembly.

Roller guide spring

Part k'

Loading roller assembly

The roller guide comes off the gear section of the loading roller assembly.

Remove the roller guide and the HL washer from the shaft

of the loading roller assembly. (3) Remove the screw J attaching the lock arm rivet assembly. (4) Push the shaft at the joint i' of the lock arm rivet assembly

inward to release the lock arm rivet assembly from the slot

of the L side plate. (5) Extend the lock arm rivet assembly outward and relea se

the joint j' from the boss of the chassis rivet assembly. The

roller guide springs on both sides come off at the same

time.

CAUTION:

When reassembling, reattach the left and right roller guide springs to the lock arm rivet assembly before reattaching the lock arm rivet assembly to the chassis rivet assembly. Make sure to fit the part k' of the roller guide spring inside of the roller guide. (Refer to Fig.34.)

Roller guide

HL washer

Loading roller assembly

Roller guide

Chassis rivet assembly

Roller guide spring

Fig.32

Boss

L side plate

Roller guide spring

Joint h'

Roller guide spring

Loading roller assembly

Joint g'

Lock arm rivet assembly

Fig.31

Roller guide spring

Lock arm rivet assembly

Joint i'

Part j'

Fig.33

Roller guide

HL washer

Roller shaft assembly

Loading roller

Roller guide spring

Fig.34

1-20 (No.MA036)

3.2.16 Removing the loading gear 5, 6 and 7 (See Figs.35 and 36)

• Prior to p erforming the following procedure, remove the top

cover, chassis unit, pickup unit and top plate assembly. (1) Remove the screw K attaching the lo ading gear bracket.

The loading gear 6 and 7 come off the loading gear bracket.

(2) Pull out the loading gear 5.

Loading gear bracket

Loading gear 6

Loading gear 5

Loading gear 3

Fig.35

Loading gear bracket

Loading gear 5

Loading gear 6

Loading gear 7

Fig.36

(No.MA036)1-21

3.2.17 Removing the gears (See Figs.37 to 40)

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

cover, chassis unit, top plate assembly and pickup unit.

• Pull out the loading gear 3. (See Fig .3 5.)

(1) Pull out the feed gear. (2) Move the loading plate assembly in th e directio n of th e ar-

row to release the L side plate from the two slots m' of the chassis rivet assembly. (See Fig.37.)

(3) Detach the loading plate assembly upward from the chas-

sis rivet assembly while releasing the joint n'. Remove the slide hook and loading plate spring from the loading plate assembly.

(4) Pull out the loading gear 2 and remove the change lock le-

ver.

(5) Remove the E ring and washer attaching the changer gear

(6) The changer gear 2, change gear spring and adjusting

washer come off. (7) Remove the loading gear 1. (8) Move the change plate rivet assembly in the direction of the

arrow to release from the three shafts of the chassis rivet

assembly upward. (See Fig.38.) (9) Detach the loading gear plate rivet assembly from the shaft

of the chassis rivet assembly upward while releasing the

joint p'. (See Figs.38 and 40.)

(10) Pull out the loading gear 4.

Change plate rivet assembly

Shafts

E ring

Loading plate assembly

Loading plate spring

Joint p'

Loading gear 4

Loading gear plate rivet assembly

Shaft

Loading gear 2

Loading gear 1

Chassis rivet assembly

Change gear 2

Fig.38

Joint n'

Slide hook

Feed gear

Fig.37

Slot m'

L side plate

Loading plate assembly

Joint n'

Slot m'

Chassis rivet assembly

E ring

Washer

Change gear 2

Change gear spring

Adjusting washer

Change plate

rivet assembly

Chassis rivet assembly

L side plate

Slot m'

Fig.39

Loading gear 1

Loading gear 2

Change lock lever

Loading gear 4

1-22 (No.MA036)

Loading gear plate rivet assembly

Fig.40

3.2.18 Removing the turn table / spindle motor (See Figs.41 and 42)

• Prior to p erforming the following procedure, remove the top

cover, connector board, chassis unit and clamper assembly. (1) Remove the two screws L attaching the spindle motor as-

sembly through the slot of the turn table on top of the body.

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

Turn table

Fig.41

Turn table

Spindle motor

Fig.42

(No.MA036)1-23

SECTION 4

ADJUSTMENT

4.1 Adjustment method  Test instruments required for adjustment

(1) Digital oscilloscope (100MHz) (2) AM Standard signal generator (3) FM Standard signal generator (4) Stereo modulator (5) Electric voltmeter (6) Digital tester (7) Tracking offset meter (8) Test Disc JVC :CTS-1000 (9) 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(10.5 to 16V) Load impedance 20KΩ(2 Speakers connection) Output Level Line out 2.0V (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.

1-24 (No.MA036)

Heat sink

Extension cable

EXTSH002-22P

Rear bracket

5.1 Feed section

SECTION 5

TROUBLE SHOOTING

Is the voltage output at IC541 pin 40 5v or 0V

YES

Is 4V present at both sides of the feed motor?

YES

Check the feed motor.

5.2 Focus section

5.3 Spindle section

Is the wiring for IC541 pin 40 correct?

Is 6V or 2V present at IC501 pins 4 and 5?

Check IC501.

When the lens is moving:

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

YES

Is 5V present at IC501 pins 3,12 and 21?

Check the vicinity of IC541.

Check the feed motor connection wiring.

Check the circuits in the vicinity of IC501 pins 8 and 9.

Check the pickup and its connections.

Check CD 8V.

YES

Is the disk rotated?

YES

Does the RF signal appear at IC521 pin 19?

YES

Is the RF waveform at IC521 pin 19 distorted?

YES

Proceed to the Tracking section

5.4 Tracking section

When the disc is rotated at first:

Is the tracking error signal output at IC521 pin 11?

Is 4V present between IC501 pins 6 and 7?

Check the spindle motor and its wiring.

Check the circuits in the vicinity of IC521 pin 19 or the pickup.

Approx. 1.2V

YES

Check the circuits in the vicinity of IC501 pins 2 to 11.

Is 4V present at IC541 pin 41?

YES

Check the vicinity of IC501

Check the pickup and its connections.

Check IC541.

YES

Check IC541.

(No.MA036)1-25

5.5 Signal processing section

Is the sound output from both channels (L, R)?

Normal

YES

No sound from either channel.

YES

Is 9V present at IC161 pin 31?

YES

NONO

Compare the L-ch and

R-ch to locate the

defective point.

Check the vicinity of the

IC901 audio power

supply.

Is the audio signal

(including sampling output

components) output to

IC581 pins 1 and 7 during

playback?

YES

Is the audio signal output

at IC161 pins 3 and 30

during playback?

YES

Check the muting circuit.

Check IC581 and its peripheral circuits.

Check IC161 and its peripheral circuits.

1-26 (No.MA036)

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.

5.7 Replacement of laser pickup

Turn off the power switch and,disconnect the power cord from the ac outlet.

Replace the pickup with a normal one.(Refer to "Pickup Removal" on the previous page)

Is RF output

1.0 0.35Vp-p?

YES

O.K

(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.

Replace it.

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

(No.MA036)1-27

5.8 16 pin cord diagram

BL/WH

WH/BK

GN/BK

GY/BK

16 YL

8 BK

7 RD

5 BL/WH REMOTE

4 WH

12 WH/BK

3 GN

11 GN/BK RL-

2 VI RR+

10 VI/BK

1 GY FR+

VI/BK

MEMORY

GND

ACC

FL+

FL-

RL+

RR-

Black

Red

Blue

White

Green

Violet

Gray

Yellow

1-28 (No.MA036)

9 GY/BK

Rear Right

Front Right

Front Left

Rear Left

FR-

REMOTE

ACC

MEMORY

GND

Remote

ACC Line

Memory Backup Battery

Ground

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