Sony HCDGP-5 Service manual

HCD-GP5

SERVICE MANUAL

Ver 1.5 2004.10

HCD-GP5 is the Amplifier, CD player, Tape
Deck and Tuner section in CMT-GP5.

CD
Section

TAPE
Section

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM55A-K6BD44B
Base Unit Name BU-K1BD44B
Optical Pick-up Name KSM-213D
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type CMAL1Z240A

Amplifier section

AUDIO POWER SPECIFICATIONS:
(U.S.A. model only)

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
With 6-ohm loads, both channels driven, from 120 ­10,000 Hz; rated 35 watts per channel minimum RMS
power, with no more than 10% total harmonic
distortion from 250 milliwatts to rated output.
North American model:
Continuous RMS power output (reference):

European model:
DIN power output (rated): 30 + 30 W

Continuous RMS power output (reference):

Music power output (reference ):

Other models:
The following measured at AC 230 V or AC 120 V, 50/
60 Hz
DIN power output (rated): 30 + 30 W

Continuous RMS power output (reference):

35 + 35 W
(6 ohms at 1 kH z, 10%
THD)

(6 ohms at 1 kH z, DIN)

30 + 30 W
(6 ohms at 1 kH z, 10%
THD)

60 + 60 W

(6 ohms at 1 kH z, DIN)

30 + 30 W
(6 ohms at 1 kH z, 10%
THD)

SPECIFICATIONS

Inputs
MD IN (phono jacks):

Outputs
PHONES (stereo minijack):

SPEAKERS: Accepts impedance of 6 to

CD player section

System Compact disc and digital

LaserSemiconductor laser

Frequency response 2 Hz – 20 kHz (±0.5 dB)

Tape deck section

Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB),

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Sensitivity 500 mV,
impedance 47 kilohms

Accepts headphones with
an impedance of 8 ohms or
more

16 ohms.

audio system

λ

=780 nm)

(
Emission duration:
continuous

using Sony TYPE I
cassettes

Tuning range 87.5 – 108.0 MHz (50-kHz

Antenna FM lead antenna
Antenna terminals 75 ohms balanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range
Pan-American model: 530 – 1,710 kHz

European model: 531 – 1,602 kHz

Other models: 530 – 1,710 kHz

Antenna AM loop antenna, external

Intermediate frequency 450 kHz

step)

(with the tuning interval
set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval
set at 9 kHz)

(with the tuning interval
set at 9 kHz)

(with the tuning interval
set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)

antenna terminal

— Continued on next page —

9-877-380-06

2004J16-1
© 2004.10

MICRO HI-FI COMPONENT SYSTEM

Sony Corporation

Personal Audio Company
Published by Sony Engineering Corporation

HCD-GP5

Ver 1.3 2004.01

TABLE OF CONTENTS

General

Power requirements
North American model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Australian model: 230 - 240 V AC, 50/60 Hz
Hong Kong model:
Singaporean model:
Other models:

Power consumption
North American model: 60 watts
European model: 60 watts

Other models: 60 watts
Dimensions (w/h/d) Approx. 190 × 250 × 270

Mass Approx. 4.6 kg

Design and specifications are subject to change
without notice.

220 - 240 V AC, 50/60 Hz
220 - 240 V AC, 50/60 Hz
110 - 120 V or 220 - 240 V
AC, 50/60 Hz
Adjustable with voltage
selector

0.3 watts (in the standby
mode)

mm

1. SERVICING NOTES ······················································· 3

2. GENERAL ··········································································5

3. DISASSEMBLY

3-1. Top Cabinet, Rear Panel·················································· 7
3-2. Front Panel Assy ····························································· 8
3-3. CONTROL Board, Single Cassette Mechanism············· 8
3-4. CD Mechanism Deck (CDM55A-K6BD44B)················ 9
3-5. MAIN Board, TRANSFORMER Board······················· 10
3-6. LOADING Board·························································· 10
3-7. CD Board ······································································ 11
3-8. Tray (CDM55D) ··························································· 11
3-9. Optical Pick-up (KSM-213D), Holder (C213) ············· 12

4. MECHANICAL ADJUSTMENTS ····························· 13

5. ELECTRICAL ADJUSTMENTS ······························· 14

6. DIAGRAMS······································································ 17

6-1. Block Diagram ······························································ 19
6-2. Printed Wiring Board – CD Section – ························· 20
6-3. Schematic Diagram – CD Section – ···························· 21
6-4. Printed Wiring Board – Control Section – ··················· 22
6-5. Schematic Diagram – Control Section –······················ 23
6-6. Printed Wiring Boards – Main Section – ····················· 24
6-7. Schematic Diagram – Main Section (1/4) –················· 25
6-8. Schematic Diagram – Main Section (2/4) –················· 26
6-9. Schematic Diagram – Main Section (3/4) –················· 27
6-10. Schematic Diagram – Main Section (4/4) –··············· 28
6-11. Printed Wiring Board – Power Section – ··················· 29
6-12. Schematic Diagram – Power Section –······················ 30
6-13. IC Pin Function Description ······································· 35

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

7. EXPLODED VIEWS

7-1. Overall Section ····························································· 37
7-2. Front Panel Section ······················································· 38
7-3. Chassis Section ····························································· 39
7-4. CD Mechanism Deck Setion········································· 40
7-5. KSM-213D···································································· 41

8. ELECTRICAL PARTS LIST ······································· 42

2

SECTION 1

r

SERVICING NOTES

HCD-GP5

Notes on chip component replacement

•Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C during
repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or
unsoldering.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE TEST

The AC leakag e from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester , such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a V OM

or battery-operated A C voltmeter . The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a
passive VOM tha t is suitable. Nearly all battery operated digital
multimeters that have a 2 V A C range are suitable. (See Fig. A)

To Exposed Metal
Parts on Set

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the exterior.

Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

Ω

Earth Ground

AC
voltmete
(0.75 V)

3

HCD-GP5

Service Position of the CD Mechanism Deck

MAIN Board

CD Mechanism Deck
(CDM55A-K6BD44B)

Service Position of the Tape Cassette Mechanism Deck

MAIN Board

Tape Cassette Mechanism Deck
(CMAL1Z240A)

4

SECTION 2

Illustrati

GENERAL

List of button locations and reference pages

HCD-GP5

This section is extracted
from instruction manual.

How to use this page

Use this pa ge to fin d th e lo c atio n o f b u tto ns an d o th e r
parts of the system that are mentioned in the text.

Main unit

ALPHABETICAL ORDER

A – M

Cassette compartment qg
CD SYNC qd (12)
DIRECTION 9 (11, 12, 15)
Disc tray 4
DISPLAY 8 (9, 10, 16)
Display window 3
DSG qa (13)
MD qj (17)

P – Z

PHONES jack qh
PLAY MODE/TUNING MODE

9 (6, 7)
Remote sensor 2
TUNER/BAND qj (8, 9)
TUNING +/– 6 (8 , 9)
VOLUME +/– 7 (14, 15)

12 345

on number

r

DISPLAY 8 (9, 10, 16)

Name of button/par t Reference page

RR

BUTTON DESCRIPTIONS

?/1 (po w e r) 1 (5, 9, 14, 15)
.m/ M> (go back/go

forward or fast forward/
rewind) 6 (5, 6, 7, 11, 12, 14,

15, 16)
x (stop) qs (6, 7 , 11, 12, 20)
REC PAUSE/START z qf (12,

15)
CD NX (play/pause) qk (6 , 7)
TAPE nN (play) qk (11, 12,

15)

Z (CD open/close) 5 (6)
Z PUSH (tape open/close) 0

(11)

qk
qj

qh

6
7

8
9

qdqfqg

0qaqs

5

HCD-GP5

Remote control

ALPHABETICAL ORDER

A – M

BASS +/– 0 (13)
CLEAR 8 (8, 9)
CLOCK/TIMER SELECT w;

(14, 15)

CLOCK/TIMER SET wa (5, 14,

15)
DISPLAY 2 (9, 10, 16)
DSG qa (13)
MD qk (17)

wa
w;

ql
qk

qj

qh

qg

qf

P – Z

PLAY MODE/DIRECTION qd

(6, 7, 11, 12, 15)
PRESET +/– 5 (9)
REPEAT/FM MODE qf (7, 9)
SLEEP ql (13)
TREBLE +/– 9 (13)
TUNER BAND qh (8, 9)
TUNER MEMORY qs (8)
TUNING +/– 6 (8, 9)
VOL +/– 7 (14, 15)

BUTTON DESCRIPTIONS

?/1 (power) 1 (5, 9, 14, 15)
m/M (fast forward/re wind)

6 (6, 11)

./ > (go back/go forward)

5 (5, 6, 7, 12, 14, 15, 16)

x (s top) 4 (6, 7, 11, 12, 20)
X (pa us e) 3 (6, 11)

CD N (play) qj (6, 7)
TAPE nN (play) qg (11, 12,

15)

1
2

3
4

5

6

qd

qs

qa

Setting the clock

Use buttons on the remote for the operation.

Press ?/1 to turn on the system.

1

Press CLOCK/TIMER SET.

2

Press ./> repeatedly to set the

3

hour.
Press CLOCK/TIMER SET.

4

Press ./> repeatedly to set the

5

minute.
Press CLOCK/TIMER SET.

6

The clock starts working.

To adjust the clock

Press CLOCK/TIMER SET.

1

Press ./> to select “CLOCK”, then

2

press CLOCK/TIMER SET.
Do the same procedures as step 3 to 6

3

above.

7

8

9

0

6

• This set can be disassembled in the order shown below.

SET

TOP CABINET,
REAR PANEL

FRONT PANEL ASSY

SECTION 3

DISASSEMBLY

HCD-GP5

Ver 1.2 2003.11

CD MECHANISM DECK
(CDM55A-K6BD44B)

MAIN BOARD,
TRANSFORMER BOARD

Note: Follow the disassembly procedure in the numerical order given.

CONTROL BOARD,
SINGLE CASSETTE MECHANISM

LOADING BOARD CD BOARD TRAY (CDM55D)

3-1. Top Cabinet, Rear Panel

5

2

three s

(+KTP 3

crews

×

12)

top cabinet

a

3

six s

crews

(+BVTP 3

OPTICAL PICK-UP
(KSM-213D),
HOLDER (C213)

×

10)

qa

rear panel

a

9

three s

(+BVTP 3

crews

×

10)

4

1

three s

(+KTP 3

crews

×

12)

7

two s

crews

b

b

6

w

ire (flat type)

11p

CN304

q;

tuner (FM/AM)

(+BVTP 3

8

(+BVTP 3

three s

×

10)

crews

×

10)

7

HCD-GP5

3-2. Front Panel Assy

6

w

ire (flat type) 26p (CN302)

q;

front panel assy

2

CD lid

7

connector 5p (CN1)

5

w

ire (flat type) 13p (CN303)

1

four claws

4

four s

(+BVTP 3

crews

×

10)

3

two s

(+KTP 3

crews

×

12)

3-3. CONTROL Board, Single Cassette Mechanism

7

CONTROL

6

w

ire (flat type) 8p (CN603)

board

8

connector 6p

9

connector 5p (CN201)

1

three s

crews (+BVTP 3

2

four s

crews (+BVTP 3

3

four s

4

×

10)

×

10)

crews (+BVTP 3

w

ire (flat type) 26p (CN601)

×

10)

5

w

ire (flat type) 13p (CN602)

8

four s

crews

×

10)

9

two clamp

q;

single cassette mechanism
(CMAL1Z240A)

(+BVTP 3

8

3-4. CD Mechanism Deck (CDM55A-K6BD44B)

)

1

CD plate

7

CD mechanism deck

(CDM55A-K6BD44B)

5

6

CD holder

4

s

crew (+BVTP 3

CN101

×

10)

3

w

ire (flat type) 21p (CN101,305

HCD-GP5

CN305

2

s

crew (+BVTP 3

×

10)

9

HCD-GP5

)

3-5. MAIN Board, TRANSFORMER Board

q;

four s

(+BVTP 3

qs

TRANSFORMER

board

crews

×

10)

6

two s

(+BVTP 3

qa

power transformer

5

main heat sink

crews

1

×

10)

connector 9p (CN801)

8

sub heat sink

7

two s

crews

(+BVTP 3

9

×

10)

MAIN board

3

three s

(+BVTP 3

crews

×

10

3-6. LOADING Board

1

Remove the belt.

4

two s

(+BVTP 3

crews

×

10)

2

two s

crews (+BVTP 3

×

10)

10

4

motor

(M901)

(LD) assy

2

two

screws (+BTP 2.6

3

Remove soldering from the two points.

5

LOADING board

×

6)

p

3-7. CD Board

4

wire (flat type) 21p (CN101)

2

Remove soldering

from the four points.

1

screw(+P 2.6

5

CD board

×

5)

3

wire (flat type) 16

HCD-GP5

3-8. Tray (CDM55D)

1

While pressing the two protrusions A and B to unlock the two claws as shown,

pull the tray in the direction of the arrow C. (Be careful of the claws.)

A

claw

claw

C

2

tray

B

11

HCD-GP5

s

Ver 1.2 2003.11

3-9. Optical Pick-up (KSM-213D), Holder (C213)

3

5

screw (+PTTP M2.6)

6

stopper (BU)

7

compression spring

(T213)

8

insulator

qd

optical pick-up

(KSM-213D)

qg

holder

(C213)

insulator

2

two compression spring

1

(+PTPWH M2.6)

4

9

screw (+PTTP M2.6)

q;

stopper (BU)

qa

compression spring

(T213)

qs

insulator

qf

floating

(+PTPWH M2.6)

(T213)

two floating

insulator

screws

screw

12

SECTION 4

MECHANICAL ADJUSTMENTS

Precaution

1. Clean the following parts with a denatured alcohol-moistened
swab:

record/playback heads pinch rollers
erase head rubber belts
capstan idlers

2. Demagnetize the record/playback head with a head demag­netizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

Torque Measurement

HCD-GP5

Mode

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

Torque meter Meter reading

3.04 – 6.96 mN • m

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 mN • m
(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

3.04 – 6.96 mN • m

(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 mN • m
(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

6.97 – 14.02 mN • m
(71 to 143 g • cm)

(0.98 – 1.99 oz • inch)

9.8 mN • m or more

(100 g • cm or more)

(1.4 oz • inch or more)

9.8 mN • m or more

(100 g • cm or more)

(1.4 oz • inch or more)

13

HCD-GP5

SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION 0 dB=0.775V

1. Demagnetize the record/playback head with a head demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the
parts adjusted.

4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6. The adjustments should be performed for both L-CH and R­CH.

7. Switches and controls should be set as follows unless otherwise
specified.

Signal Used forTape

P-4-A100

WS-48B

[Record/Playback Head Azimuth Adjustment]

Procedure:

1. Mode : Playback

test tape
P-4-A100
(10kHz, –10dB)

2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.

10 kHz, –10 dB

3 kHz, 0 dB

MAIN board
J203
speaker terminal

set

Azimuth Adjustment

Tape Speed Adjustment

level meter

+
–

3. Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

set

in phase 45

MAIN board
J203
speaker terminal

L

R

Waveform of oscilloscope

°

90

°

good

135

oscilloscope

°

wrong

180

°

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

Adjustment Location:Record/Playback/Erase Head

[Tape Speed Check]

Procedure:

1. Turn the power on.

2. Insert the WS-48B into deck.

3. Press the Y button of deck.

4. Check the reading of frequency counter becomes 3000 ± 90 Hz.

Sample Value of Wow and flutter

W.RMS (JIS) less than 0.3%
(test tape: WS-48B)

L-CH
peak

screw
position

14

R-CH
peak

output
level

within
1 dB

L-CH
peak

R-CH
peak

within 1dB

screw
position

HCD-GP5

+
–

CD board

TP (RFAC)

TP (VC)

oscilloscope

CD SECTION

Note:

1. CD Block is basically designed to operate without adjustment. There­fore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.

S-curve Check

Connection:

oscilloscope

CD board

TP (FE)

TP (DVC)

Procedure:

1. Connect an oscilloscope to test point TP (FE) and TP (DVC)

on the CD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in and turned power switch on again

and actuate the focus search. (actuate the focus search when
disc table is moving in and out)

4. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.

S-curve waveform

+
–

symmetry

A

B

within 2

±

1 Vp-p

RFDC signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level: 0.7

±

0.2 Vp-p

Checking Location: CD board (Conductor side)

RFAC Level Check

Connection:

Procedure:

1. Connect an oscilloscope to test point TP (RFA C) and TP (VC)
on the CD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope waveform is clear and check RF AC
signal level is correct or not.

Note: A clear RFAC signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

RFAC signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

Note: •Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the
brightness to obtain best waveform.

Checking Location: CD board (Conductor side)

RFDC Level Check

Connection:

oscilloscope

CD board

TP (RFDC)

TP (DVC)

+
–

Procedure:

1. Connect an oscilloscope to test point TP (RFDC) and TP (DVC)
on the CD board.

2. Turn the power on.

3. Put the disc (YEDS-18) in to playback the number five track.

4. Confirm that oscilloscope waveform is clear and check RFDC
signal level is correct or not.

Note: A clear RFDC signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

level: 0.9

Checking Location: CD board (Conductor side)

±

0.4 Vp-p

15

HCD-GP5

E-F Balance Check

Connection:

oscilloscope

CD board

TP (TE)

TP (DVC)

+
–

Procedure:

1. Connect an oscilloscpe to test point TP (TE) and TP (DVC) on
the CD board.

2. AC is put in pushing CD u button.

3. FL tube carries out all lights and goes into CD test mode.

4. Put the disc (YEDS-18) in to playback the number five track.

5. Press the CD u button. (The tracking servo and the sledding
servo are turned OFF)

6. Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Tr averse Waveform

0V

Center of
the waveform

B

A (DC

voltage)

Checking Location:

– CD BOARD (Conductor Side) –

TP (VC)

IC103

TP

(RFAC)

TP (TE)

TP (FE)

TP

(DVC)

IC101

TP

(RFDC)

level: 1.15 ± 0.5 Vp-p

7. Press the CD u button. (The tracking servo and sledding
servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 4.

8. To exit from this mode, turn the power off.

Notes: •Always move the optical pick-up to most inside track when

0V

exiting from this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can
be chipped.

Tr averse Waveform

Tr acking servo

Sled servo

OFF

Tr acking servo

Sled servo

ON

C (DC
voltage)

Checking Location: CD board (Conductor side)

16