Sharp GXCD-130, GXCD-130-C, GXCD-30, GXCD-30-C Service manual

GX-CD30/30C/130/130C

SERVICE MANUAL

GX-CD30
GX-CD30C
GX-CD130

No. S3607GX-CD130

Illustration: GX-CD130

• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified
should be used.

GX-CD130C

CONTENTS

IMPORTANT SERVICE NOTES (FOR GX-CD30/130 ONLY) .......................................................................................... 2

SPECIFICATIONS ............................................................................................................................................................. 2

NAMES OF PARTS ........................................................................................................................................................... 3

DISASSEMBLY.................................................................................................................................................................. 4

REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 6

ADJUSTMENT ................................................................................................................................................................... 8

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 10

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 13

TYPES OF TRANSISTOR ............................................................................................................................................... 13

BLOCK DIAGRAM ........................................................................................................................................................... 14

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 18

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 27

FUNCTION TABLE OF IC................................................................................................................................................ 28

PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET (FOR GX-CD30/130 ONLY)

Page

DIFFERENCE BETWEEN GX-CD30/30C AND GX-CD130/130C

GX-CD30/30C

REMOTE None Used
CONTROL

X-BASS None Used

GX-CD130/130C

SHARP CORPORATION

SHARP ELECTRONICS CORPORATION

Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135

GX-CD30/30C/130/130C

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

IMPORTANT SERVICE NOTES (FOR GX-CD30/130 ONLY)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)
Before returning the audio product to the user, perform the
following safety checks.

1. Inspect all lead dress to make certain that leads are not
pinched or that hardware is not lodged between the chassis
and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials,
cabinet, terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists, check for leakage
current in the following manner.

* Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5k ohm, 10 watt resistor

paralleled by a 0.15µF capacitor in series with all exposed
metal cabinet parts and a known earth ground, such as
conduit or electrical ground connected to earth ground.

* Use a VTVM or VOM with 1000 ohm per volt, or higher,

sensitivity to measure the AC voltage drop across the
resistor (See diagram).

* Connect the resistor connection to all exposed metal parts

having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.

VTVM

AC SCALE

1.5k ohms
10W

0.15 µ F

TO EXPOSED
METAL PARTS

All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.

TEST PROBE

CONNECT TO
KNOWN EARTH
GROUND

SPECIFICATIONS

●

General

Power source: AC 120V, 60 Hz

DC 12 V [ "D" size (UM/SUM-1, R20
or HP-2) battery x 8]

Power consumption: 25 W
Output power: FTC; 2.5 W minimum RMS per
(30/130) channel into 6 ohms from 100 Hz to

20 kHz with no more than 10 % total
harmonic distortion.
RMS; 3.5 W per channel at 1 kHz,
10 % total harmonic distortion.
(AC operation)

Output power: RMS; 7 W (3.5 W + 3.5 W)
(30C/130C) (AC operation, 10 % T.H.D.)
Output terminal: Headphones; 16 - 50 ohms

(recommended; 32 ohms)

Dimensions: Width; 12" (304 mm)

Height; 9-1/4" (234 mm)
Depth; 8-9/16" (216 mm)

Weight: 7.1 Ibs. (3.2 kg) without batteries

● Radio

Frequency range: FM; 87.6 - 108 MHz

AM; 530 - 1,702 kHz

● Tape recorder

Frequency response: 50 - 14,000 Hz (Normal tape)
Signal/noise ratio: 50 dB (TAPE 1, recording / playback)

55 dB (TAPE 2, playback)

Wow and flitter: 0.25 % (WRMS)
Motor: DC 12 V electric governor
Bias system: AC bias
Erase system: AC erase

● Compact disc player

Disc: Compact disc
Signal readout: Non-contact, 3-beam semi-

conductor laser pickup

Audio channels: 2
Quantization: 16-bit linear
Filter: 4-tims oversampling digital filter
D/A converter: 1-bit D/A converter
Wow and flutter: Unmeasurable

(less than 0.001% W. peak)

● Speaker

Type: 2-way bass-reflex type
Speakers: 4" (10 cm) woofer x 2

Tweeter x 2

Maximum input power: 5 W
Impedance: 6 ohms
Dimensions: Width; 7-5/16" (185 mm)

Height; 8-11/16" (220 mm)
Depth; 5-15/16" (150 mm)

Weight: 2.2 Ibs. (1.0 kg) /each

Specifications for this model are subject to change without
prior notice.

– 2 –

NAMES OF PARTS

25˚

25˚

H Main Unit

1. CD Play Indicator:

2. CD Repeat Indicator:

3. CD Track Number Indicator

4. CD Eject Button:

5. Remote Control Sensor (GX-CD130/130C ONLY)

6. CD compartment

7. (CD) Track Down/Review Button:

8. (CD) Track Up/Cue Button:

9. (CD) Stop Button:

10. (CD) Play/Repeat Button:

11. (CD) Pause Button:

12. Tuning Control

13. Power/Function/Band Selector Switch

14. Beat Cancel Switch

15. X-Bass Switch (GX-CD130/130C ONLY)

16. Tone Control

17. Volume Control

18. Tweeter

19. Woofer

20. Bass Reflex Port

21. (TAPE1) Cassette Compartment

22. (TAPE1) Record Button:

23. (TAPE1) Play Button:

24. (TAPE1) Rewind Button:

25. (TAPE1) Fast Forward Button:

26. (TAPE1) Stop Eject Button:

27. (TAPE2) Play Button:

28. (TAPE2) Stop Eject Button:

29. (TAPE2) Cassette Compartment

30. Speaker Terminals

31. FM Telescopic Rod Aerial

32. Speaker Wire

33. Speaker Release Lever

34. Battery Compartment

35. Headphones Socket

36. AC Power Input Socket

H Remote Control (GX-CD130/130C ONLY)

1. Remote Control Transmitter LED

2. (CD) Play/Repeat Button:

3. (CD) Track Down /Review Button:

4. (CD) Pause Button:

5. (CD) Track Up/Cue Button:

6. (CD) Stop Button:

00

0

00

RR

R

RR

77

7

77

5 5

3 3

5 /

3

5 5

3 3

44

22

4 /

2

44

22

HH

H

HH

0R0R

0R

0R0R

66

6

66

II

I

II

00

0

00

33

3

33

22

2

22

H H

7 7

H /

7

H H

7 7

00

0

00

H H

7 7

H /

7

H H

7 7

0R0R

0R

0R0R

5 5

3 3

5 /

3

5 5

3 3

66

6

66

4 4

22

4 /

2

4 4

22

HH

H

HH

14
15
16
17

18
19

20

GX-CD30/30C/130/130C

3
1
2

4 5 6 7 8 9 1011 12 13

21 22 23 24 25 26 27 28 29

32

30 31 32

33 33363534

1

2

3

4

18
19

20

5

6

Notes concerning use:

• Periodically clean the transmitter LED on the remote control
and the sensor on the main unit with a soft cloth.

• Exposing the sensor on the main unit to strong light may
interfere with operation. Change the lighting or the direction
of the unit.

• Keep the remote control away from moisture, excessive
heat, shock, and vibrations.

8" - 20' (0.2 - 6 m)

– 3 –

GX-CD30/30C/130/130C

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling the
unit and reassembling it, to keep it safe and ensure excellent
performance:

1. Take cassette tape and compact disc out of the unit.

2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.

3. Take off nylon bands or wire holders where they need be
removed when disassembling the unit. After servicing the
unit, be sure to rearrange the leads where they were
before disassembling.

4. Take suffcient care on static electricity of integrated
circuits and other circuits when servicing.

Front
Cabinet

( A3 ) x1

( A2 ) x1

Power PWB

( A1 ) x2
ø3 x12mm

STEP REMOVAL PROCEDURE FIGURE

UNIT

1 Front Cabinet 1. Screw....................(A1) x7 4-1

2. Socket...................(A2) x1

3. Flat Cable ............. (A3) x1

2 Top Cabinet 1. Open the CD lid.

(with CD Block) 2. Screw.................... (B1) x5 4-2

3. Flat Cable ............. (B2) x2 4-2, 4-3

4. Tip.........................(B3) x1 4-2

3 Tuner PWB 1. Screw................... (C1) x3 4-3

(with Tuner Frame) 2. Flat Cable .............(C2) x1

4 Main PWB 1. Screw................... (D1) x1 4-3

2. Knob .................... (D2) x2

3. Flat Cable .............(D3) x1

5 Deck PWB 1. Screw....................(E1) x3 4-3

2. Socket...................(E2) x3

6 Tape Mechanism 1. Open the cassette holder.

2. Screw....................(F1) x6 5-1

7 Display PWB 1. Screw................... (G1) x2 5-2

(with CD control 2. Hook .................... (G2) x3

Button) 3. Flat Cable ............ (G3) x1 4-2

8 Switch PWB 1. Screw................... (H1) x1 5-2

9 CD Servo PWB 1. Screw.................... (J1) x3 5-2

2. Socket................... (J2) x3

10 CD Mechanism 1. Screw....................(K1) x3 5-3

11 Power PWB/ 1. Open the battery lid.

Terminal PWB 2. Screw.................... (L1) x4 5-4

3. Hook ..................... (L2) x1

SPEAKER

1 Front Panel 1. Screw...................(A1) x4 5-5

Front
Cabinet

( B1 ) x2
ø3 x10mm

Front
Cabinet

Rear
Cabinet

( B3 ) x1

( D2 ) x2

OPEN

Figure 4-1

( B1 ) x1
ø3 x8mm

CD Servo PWB

Tape
Mechanism

Figure 4-2

( A1 ) x4
ø3 x20mm

( B1 ) x2
ø3 x10mm

( B2 ) x1

Main PWB

Deck
PWB

( A1 ) x1
ø3 x65mm

Top Cabinet

( B2 ) x1

( G3 ) x1

CD Servo
PWB

Washer

( D1 ) x1
ø3 x10mm

( E1 ) x3
ø3 x10mm

Tuner
PWB

– 4 –

Tape
Mechanism

( C2 ) x1

( E2 ) x1

Tuner
PWB

Figure 4-3

( C1 ) x3
ø3 x10mm

( E2 ) x2

( D3 ) x1

Tape

Power PWB

Terminal
PWB

( L1 ) x3
ø3 x10mm

( L1 ) x1
ø3 x10mm

Rear Cabinet

Driver

Push

( L2 ) x1

( A1 ) x4
ø3 x20mm

Front Panel

Mechanism

GX-CD30/30C/130/130C

Front Cabinet

( F1 ) x6
ø3 x10mm

( G1 ) x2
ø3 x10mm

( H1 ) x1
ø3 x12mm

( G2 ) x3

Switch
PWB

( K1 ) x3
ø2.6 x10mm

Figure 5-1

Display
PWB

Figure 5-2

Figure 5-4

( J1 ) x3
ø3 x10mm

( J2 ) x1

CD Servo
PWB

Top Cabinet

( J2 ) x2

Figure 5-5

CD Mechanism

Figure 5-3

– 5 –

GX-CD30/30C/130/130C

Pawl
(C1)x2

Play Button

Playback Head

B

B

TAPE 2

TAPE1
Main Belt
(E1)x1

TAPE2
Main Belt
(F1)x1

Main Belt
(F1)x1

Main Belt
(E1)x1

FF/REW Belt
(E2)x1

Flywheel

Flywheel

Motor

Motor

TAPE 1

TAPE 2

REMOVING AND REINSTALLING THE MAIN PARTS

TAPE MECHANISM SECTION

Perform steps 1, 2, 3, 4, 5 and 6 of the disassembly method
to remove the tape mechanism.

How to remove the record/playback and erase
heads (TAPE 1) (See Fig. 6-1.)

1. Carefully bend the record/playback head pawls (A1) x 2
pcs., in the direction of the arrow Â, and remove the record/
playback head upwards.

2. Remove the screws (B1) x 2 pcs., to remove the erase head.

How to remove the playback head (TAPE 2)
(See Fig. 6-2.)

1. Carefully bend the playback head pawls (C1) x 2 pcs., in the
direction of the arrow È, and remove the playback head
upwards.

How to remove the pinch roller (TAPE 1/2)
(See Fig. 6-3.)

1. Carefully bend the pinch roller pawl in the direction of the
arrow Ê, and remove the pinch roller (D1) upwards.

How to remove the belt (TAPE 1) (See Fig. 6-4.)

1. Remove the main belt (E1) x 1 pc., from the motor side.

2. Remove the FF/REW belt (E2) x 1 pc.

How to remove the belt (TAPE 2) (See Fig. 6-4.)

1. Remove the tape 2 main belt (E1) x 1pc., from the motor side.

2. Remove the tape 1 main belt (F1) x 1pc., from the motor side.

( B1 ) x2
ø2 x7mm

Erase Head

Play Button

TAPE 1

A

Figure 6-1

Record/Playback
Head

A

Pawl
(A1)x2

How to remove the motor
(See Figs. 6-5 and 6-6.)

1. Remove the belt.

2. Remove the screws (G1) x 4 pcs., to remove the motor fixture.

3. Remove the screws (G2) x 2 pcs., to remove the motor.

Note:

When mounting the motor, pay attention to the motor mounting
angle.

TAPE2 TAPE1

Motor

Motor
Bracket

Motor

( G1 ) x2
ø2 x4mm

Figure 6-5

( G1 ) x2
ø2 x4mm

Motor
Bracket

Figure 6-2

Pinch Roller
(D1) x 1

Pawl

Figure 6-3

C

( G1 ) x2
ø2.6 x2mm

Figure 6-6

Figure 6-4

– 6 –

CD MECHANISM SECTION

Pickup

( F2 ) x2
ø2.6 x6mm

( F1 ) x2

CD Mechanism

CD Cover

Shaft
( F3 ) x1

Gear
( F5 ) x1

Stop Washer
( F4 ) x1

( F1 ) x2

Perform steps 1, 2, 9 and 10 of the disassembly method to
remove the CD mechanism.

How to remove the pickup (See Fig. 7-1.)

1. Remove the hooks (F1) x 4 pcs., to remove the CD cover.

2. Remove the screws (F2) x 2 pcs., to remove the shaft (F3)
x1 pc.

3. Remove the stop washer (F4) x1 pc., to remove the gear
(F5) x 1 pc.

4. Remove the pickup.

GX-CD30/30C/130/130C

Figure 7-1

FITTING OF DIAL POINTER

1. Remove the three screws, and remove the tuner PWB from the tuner frame. (See Fig. 7-2)

2. Turn fully the dial wheel in the  direction. (See Fig. 7-3)

3. Set the dial pointer as shown in Figure 7-2, and mount the tuner PWB.

"0" Point

Tuner
Frame

Dial
Pointer
( 229 )

Screw x3

Tuner PWB

(Top view)

Tuner PWB

(Bottom view)

A

Figure 7-2 Figure 7-3

– 7 –

GX-CD30/30C/130/130C

Pin 13 of IC2 Pin 21 of IC2

D

G

S

10 kohm

TO FREQUENCY
COUNTER

FET : 2SK19 or 2SK54

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter

PLAY: TW-2412 Tape 1: Over 50 g

Tape 2: Over 100 g

• Torque Check

Torque Meter

Play: TW-2111 30 to 60 g.cm 30 to 60 g.cm
Fast Forward: TW-2231 80 to 135 g.cm
Rewind: TW-2231 80 to 135 g.cm

• Tape Speed

Test Tape

Nomal MTT-111 3,000 Speaker
speed ± 30 Hz terminal

Specified

TAPE SECTION

Position of each switch or control

Volume control Max
Beat cancel A
Function/Power switch Tape/Off

• Bias Oscillation Check

Beat cancel A: 82 + 10 kHz / -6 kHz

• Erase Current Check

Resistor for measurement: 1 ohm 50 ± 25 mV

Specified Value

Specified Value

Tape 1 Tape 2

Instrument

Value

B: -2 ± 2 kHz
C: +3 ± 2 kHz

Connection

(Load resistance:
6 ohms)

Specified Value

Specified Value

TUNER SECTION

fL: Low-range frequency
fH: High-range frequency

• FM IF/RF

Test Stage

IF T1
Detection T2
Band Coverage fL: L2

Tracking 88.0 MHz: L1

Specified

Value/Adjusting

Point

fH: TC2

108.0 MHz: TC1

• AM IF/RF

Test Stage

IF T3 Input: Antenna

Band Coverage fL: L4 Input: Antenna

Tracking 600 kHz: L3 Socket (Load

Specified

Value/Adjusting

Point

fH: TC4 Output: Headphones

1,400 kHz: TC3 resistance: 32 ohms)

• VCO Frequency

Adjusting Point

VR1 76 kHz ± 200 Hz Pin 13, pin 21 and

Note:

After preparing the test circuit shown in Fig. 8-1, connect the
Pin 13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value. At this time, apply a standard unmodulated
signal input and adjust the VCO.

Specified

Value

Instrument

Connection

Input: Pin 1 of IC1
Output: Pin 17 of IC2

Iuput: Antenna
Output: Headphones
Socket (Load
resistance: 32 ohms)

Instrument

Connection

Output: Pin 19 of IC2

Instrument

Connection

ground of IC2

• Playback Amplifier Sensitivity Check

Specified Value

MTT-118 1.8 V ± 3 dB Speaker Terminal

(Load resistance: 6 ohms)

FM
TRACKING

Instrument ConnectionTest Tape

fH
fL

L3

AM BARANTENNA

AM TRACKING fL

Figure 8-2 ADJUSTMENT POINTS

AM TRACKING
fH

TC3

TC1

L1

FM RF
1

IC1

T1

FM IF

TC4

TC2

L2

– 8 –

L4

Figure 8-1 VCO FREQUENCY TEST CIRCUIT

AM BANDfH

fL

COVERAGE

VCO

VR1

T2

FM BANDfL

fH

FM DET

21

1

T3

19

17

IC2

AM IF

13

COVERAGE

CD SECTION

3

Since this CD system incorporates the following automatic
adjustment function, when the pickup is replaced, it is necessary
to reajust it.
Since this CD unit does not need adjustment, the combination
of PWB and laser pickup unit is not restricted.

TEST MODE

GX-CD30/30C/130/130C

Start

Note

Operation

LCD MODE

Start

Display

While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, press the PAUSE button.

1. When the CD LID switch is in the OFF position, the unit will be able to enter the test mode.
However, playback cannot be performed in this mode.

2. You can only move the pickup.

3. The LCD display should be the same as it is for normal CD operations.
The use of the "UP/CUE" button will move the pickup to the outermost position.

1

The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
When the "PLAY" button is pressed, the laser will be lit, and when the "STOP" button is pressed, it will be

2

turned off. Playback will also start and stop when these buttons are pressed.
a. If the "PLAY" button is pressed while in the stop mode, the laser will simply be turned on at first.

b. If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.
c. If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.

Turning the tracking servo on or off.3
a. Each time the PAUSE button is pressed during playback, the tracking servo will be turned on or off.

(Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be
turned on.)

While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, press the PAUSE button.

1

2

1 second

* After the number ➂ has appeared in the display, each time the "UP/CUE" button is pressed, the display will switch

in the following order: ➀, ➁, and then ➂.

1 second

– 9 –

GX-CD30/30C/130/130C

TROUBLESHOOTING (CD SECTION)

When the CD does not function

When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."

Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.

• The CD function will not work.

The CD operating keys don't work.

Yes

▼

Check the CD, DPS microcomputer (IC701), power supply, 4.19
MHz and 16.93 MHz clock, and reset terminal.

Yes

▼

Check the waveform of SCK, SO (DATA) and SI (COMM).

Yes

▼

See if the pick-up is in the pick-up in SW702 position.

Yes

▼

If the items mentioned above are OK, check the main
microcomputer IC701.

• The CD operating keys work.

Check the Focus - HF system.

Playback can be performed without a disc.

Yes

▼

Does the pick-up move up and down twice?

No

▼

Does the output waveform of IC801(16)(FD) match that shown in
Fig. 10?

No

▼

Check the IC801(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.

Yes

Yes

0.5s

0.50 V
IC801 16 FD

0.5s

0.50 V
IC801 15 TD

Focus search OK.

▼

Check the area around IC804-BI801/CNS801.

▼

Focus search
is performed
two times
when play
operation is
done without
disc.

– 10 –

1
2

Figure 10

• Playback can only be performed when a disc

3

2
1

4

0.5s

1.00 V
IC801 16 FD

0.5s

10.0 V
IC801 12 CLV+

0.5s

10.0 V
IC801 54 DRF

0.5s

2.00 V
IC801 7 TE

is loaded.

GX-CD30/30C/130/130C

Is the Focus servo active? (Can you hear it working?)

Yes

▼

Does the DRF signal change from "L" to "H"?

Yes

▼

Is HF waveform normal (see the Fig.11-1, 2)?

Yes

▼

Check the tracking system.

HF

0.1V/DIV

0.5µsec/DIV(DC)
(When playing
back the disc)

No

No

No

Check the laser diode driver.

▼

Check the area around IC801(16) - (21) (focus servo circuit).

Yes

If the disc is not turning, the DRF

▼

should not change to "H".

Check the spin

▼

system.

Yes

Level is abnormal.

▼

Check the periphery

▼

of IC801 pins 41 and

42.

Yes

Waveform is unstable.

▼

Check the spin

▼

system.

Waveform in case
of normal play­back

Figure 11-1

• Check the tracking system.

Check waveform of IC801 pin 7 (TE).

The waveform shown in Fig. 11-3

▼

appears, and no-disc state appears
soon.

Play is possible in

▼

TEST mode.

Data cannot be read.

▼

Yes

Although IL is possible,

▼

play is impossible.

Yes

5ms

1.00 V
IC801 7 TE

Tracking servo is inoperative.

▼

Yes

Normal jump is impeded, and the

▼

program top cannot be reached.

Yes

Check the VCO-PLL system.

▼

Figure 11-2

Check the periphery of IC801

Yes

4

▼

pin 8 to pin 15, and IC804 to
BI801/CNS801.

Check the periphery of

▼

IC801 pin 14.

Yes

5 ms

5.0 V
IC801 54 DRF

3

Figure 11-3

– 11 –

GX-CD30/30C/130/130C

• Checking the spin system.

Play operation is performed without disc.

Yes

▼

The turntable rotates a little.

No

▼

The turntable fails to rotate or rotates at high speed.

• Checking the VCO-PLL system

Play operation is performed when disc exits.

Yes

▼

Although HF waveform is normal, TOC data cannot be read.

Yes

Yes

Yes

The spin driver circuit is normal.

▼

Check the periphery of IC801 pins 23 to 27, pin 39 and pin 40,

▼

IC802 pin 12 and pin 13, IC804 to BI803/CNS803.

Check PDO waveform (Fig. 12).

▼

Error

▼

Check the IC801 pins 43 and 44, IC802 pins 3, 5, 7, 9 and 10.

Stop --> Play

As VCO freque-

0.5s

1.00 V
IC802 3 PDO

0.5s

1.00 V
IC801 16 FD

ncy is locked at

4.32 M Hz,
voltage of PDO

2

rises and stabili­zes.

3

Figure 12

• Although HF waveform is normal and the time
indication is normal, no sound is emitted.

Check IC802 pin 48 (EFLG).

Yes

▼

Check IC802 pins 37and 40.

Abnomal

▼

Check the periphery of IC803 (OPAMP).

No

Usually, the number of pulses of flawless disc is 100 pulses/

▼

sec or less.

– 12 –