Sony HCD-GP6V Service Manual

SERVICE MANUAL

Sony Corporation

Audio Group
Published by Sony Engineering Corporation

E Model

MICRO HI-FI COMPONENT SYSTEM

9-877-654-03

2004I16-1
© 2004.09

Ver 1.2 2004.09

SPECIFICATIONS

HCD-GP6V

Model Name Using Similar Mechanism CX-LFAV500
CD CD Mechanism Type CDM55A-30BD61S
Section Base Unit Name BU-30BD61S

Optical Pick-up Name A-MAX.3
Tape deck Model Name Using Similar Mechanism HCD-GP5
Section T ape Tr ansport Mechanism Type CMAL1Z240A

HCD-GP6V is the Amplifier, Video CD/CD play er,
Tape Deck and Tuner section in CMT-GP6V.

— Continued on next page —

Amplifier section

The following measured at AC 240 V or AC 120 V, 50/
60 Hz
DIN power output (rated): 20 + 20 W

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (refer en ce) :

30 + 30 W
(6 ohms at 1 kHz, 10%

THD)
Inputs
MD IN (phono jacks): Sensitivity 500 mV,

impedance 47 kilohms
MIC (phone jack): Sensitivity 1 mV,

impedance 10 kilohms
Outputs
PHONES (stereo minijack):

Accepts headphones with

an impedance of 8 ohms or

more
VIDEO OUT (phono jack):

Max. output level 1Vp-p,

unbalanced, Sync

negative, load impedance

75 ohms
SPEAKERS: Accepts impedance of 6 t o

16 ohms.

VIDEO CD/CD player section

System Compact disc and digital

audio system

Laser Semiconductor laser

(λ=780 nm)
Emission duration:

continuous
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
Video color system format

NTSC, PAL

Tape deck section

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

using Sony TYPE I

cassettes

2

HCD-GP6V

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

(50-kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms balanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range
Middle Eastern model: 531 – 1,602 kHz

(with the tuning interval

set at 9 kHz)
Other models: 530 – 1,710 kHz

(with the tuning interval

set at 10 kHz)

531 – 1,602 kHz

(with the tuning interval

set at 9 kHz)
Antenna AM loop antenna, external

antenna terminal
Intermediate frequency 450 kHz

General

Power requirements
Saudi Arabian model: 120 – 127/220 V AC, 50/

60 Hz

Adjustable with voltage

selector
Other models: 110 – 120/220 – 240 V AC,

50/60 Hz

Adjustable with voltage

selector
Power consumption 70 watts
Dimensions (w/h/d) Approx. 190 × 250 × 295

mm
Mass Approx. 4.7 kg
Supplied accessories Remote (1)

R6 (size AA) batteries (2)

AM loop antenna (1)

FM lead antenna (1)

Video cable (1)

Design and specifications are subject to change
without notice.

TABLE OF CONTENTS

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

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

3. DISASSEMBLY

3-1. Top Cabinet, V-OUT Board, DC Fan .............................. 7

3-2. MIC/ECHO Board........................................................... 8

3-3. CD Mechanism Section ................................................... 8

3-4. Front Panel Assy.............................................................. 9

3-5. CONTROL Board, Single Cassette Mechanism ............. 9

3-6. MAIN Board, POWER Board ......................................... 10

3-7. VCD Board,

CD Mechanism Deck (CDM55A-30BD61S).................. 11

3-8. LOADING Board ............................................................ 11

3-9. BD Board ......................................................................... 12

3-10. Tray (CDM55D) .............................................................. 12

3-11. Base Unit (BU-30BD61S)............................................... 13

4. TEST MODE ............................................................... 14

5. MECHANICAL ADJUSTMENTS......................... 15

6. ELECTRICAL ADJUSTMENTS .......................... 16

7. DIAGRAMS ................................................................. 19

7-1. Block Diagram

– BD Section – ................................................................ 20

– VCD Section –.............................................................. 21

– MAIN Section – ........................................................... 22

7-2. Printed Wiring Board – BD Section – ............................ 23

7-3. Schematic Diagram – BD Section – ............................... 24

7-4. Printed Wiring Board – VCD Section – ......................... 25

7-5. Schematic Diagram – VCD Section (1/2) – ................... 26

7-6. Schematic Diagram – VCD Section (2/2) – ................... 27

7-7. Printed Wiring Board – MAIN Section – ....................... 28

7-8. Schematic Diagram – MAIN Section – .......................... 29

7-9. Printed Wiring Boards – CONTROL Section – ............. 30

7-10. Schematic Diagram – CONTROL Section –.................. 31

7-11. Printed W iring Boards

– MIC ECHO/PHONE Section – .................................... 32

7-12. Schematic Diagram – MIC ECHO/PHONE Section – .. 33

7-13. Printed Wiring Board – POWER Section –.................... 34

7-14. Schematic Diagram – POWER Section – ...................... 35

8. EXPLODED VIEWS

8-1. Overall Section ................................................................ 41

8-2. Front Section ................................................................... 42

8-3. Chassis Section ................................................................ 43

8-4. CD Mechanism Deck Section ......................................... 44

8-5. Base Unit Section ............................................................ 45

9. ELECTRICAL PARTS LIST.................................. 46

3

HCD-GP6V

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-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.

CAUTION

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

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

SECTION 1

SERVICING NOTES

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.

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.

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

4

HCD-GP6V

Service Position of the CD Mechanism Deck and VCD Board

Service Position of the Tape Cassette Mechanism Deck

CD Mechanism Dec

k

(CDM55A-30BD61S)

VCD Board

CN806

MAIN Board

CN802

Extension cable J-2501-245-A
(1.00mm/23P/L300)

Extension cable J-2501-225-A
(1.00mm/9P/L300)

MAIN Board

Tape Cassette Mechanism Deck
(CMAL1Z240A)

5

HCD-GP6V

SECTION 2

GENERAL

This section is extracted
from instruction manual.

Main unit

Cassette compartment qg
CD SYNC qd (18)
DIRECTION 9 (17, 18, 22)
Disc tray 4
Display window 3
MD qk (26)
MIC/ECHO qa (19)
MIC jack qh

PHONES jack qj
PLAY MODE/TUNING MODE

9 (9, 12, 14, 16)
Remote sensor 2
REPEAT/FM MODE 8 (12, 16)
TUNER/BAND qk (14, 16)
TUNING +/– 6 (14, 16)
VOLUME +/– 7 (19, 21)

?/1 (power) 1 (7, 8, 15, 21, 22)
.m/M> (go back/go

forward or fast forward/
rewind) 6 (8, 10, 12, 13, 17,
18, 19, 21, 22, 24)

x (stop) qs (10, 11, 13, 15, 17,

18, 20, 29)

zREC PAUSE/START qf (18,

20)

CD NX (play/pause) ql (9, 11,

12, 15, 33)

TAPE nN (play) ql (17, 18)

Z (CD open/close) 5 (9, 10)
Z PUSH (tape open/close) 0

(17)

List of button locations and reference pages

How to use this page

Use this page to find the lo ca tion of buttons and other
parts of the system that are mentioned in the text.

Illustrati

on number

r

DISPLAY 2 (16, 24)

RR

Name of button/par t Refer en ce pag e

ALPHABETICAL ORDER

A – M

P – Z

BUTTON DESCRIPTIONS

12 345

6
7

8

ql
qk

qj
qh

9

0qaqsqdqfq

g

6

HCD-GP6V

Remote control

ALBUM +/– qf (10)
BASS/TREBLE wa (19)
CD wf (9, 12, 15)
CLEAR qk (13, 15)
CLOCK/TIMER SELECT w;

(22, 23)

CLOCK/TIMER SET 4 (8, 21,

22)
DISPLAY 2 (16, 24)
DSG qd (19)
ENTER 3 (8, 12, 15, 21, 22)
KEY CONTROL 7 (20)
K.PON/MPX ql (19)

NEXT 9 (11)
Numeric buttons 6 (10, 11, 13,

16)
ON SCREEN wj (25)
PICTURE EFFECT* wh
PREV 9 (11)
SELECT q;
SLEEP qj (21)
SPECIAL MENU qh (13)
TAPE wd (17)
TUNER BAND ws (14, 16)
TUNING MEMORY 5 (14)
VOLUME +/– qs (19, 21)

?/1 (power) 1 (7, 8, 15, 21, 22)
m/M (fast forward/rewind)

8 (10, 13, 17)

./> (go back/go forward)

9 (8, 10, 12, 18, 19, 21, 22,

24)

x (stop) qa (10, 11, 13, 15, 17,

18, 20, 29)

X (pause) qg (10, 17)
N (play) q; (9, 11, 12, 17, 18,

33)
+/– 9
RETURN O wg (11)

*This button cannot be used in

this system.

ALPHABETICAL ORDER

A – K

N – Z

BUTTON DESCRIPTIONS

`/1

X

O

1

3

2

qj

qk

qh

4
5

6

8

7

qs

qf

0
qa

qg

qd

9

`/1

X

O

w;

ql

wa

ws

wd

wf

wj

wg

wh

Use buttons on the remo te fo r the operation.

1

Press ?/1 to turn on the system.

2

Press CLOCK/TIMER SET.

3

Press ./> repeatedly to set the
hour.

4

Press ENTER.

5

Press ./> repeatedly to set the
minute.

6

Press ENTER.

The clock starts working.

To adjust the clock

1

Press CLOCK/TIMER SE T.

2

Press ./> to select “CLOCK”, then
press ENTER.

3

Do the same procedures as step 3 to 6
above.

Setting the clock

7

HCD-GP6V

SECTION 3

DISASSEMBLY

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

3-6.MAIN BOARD,

POWER BOARD

(Page 10)

3-8.LOADING BOARD

(Page 11)

3-9.BD BOARD

(Page 12)

3-10.TRAY (CDM55D)

(Page 12)

3-11.BASE UNIT

(BU-30BD61S)

(Page 13)

3-7.VCD BOARD,

CD MECHANISM DECK

(CDM55A-30BD61S)

(Page 11)

3-5.CONTROL BOARD,

SINGLE CASSETTE MECHANISM

(Page 9)

3-4.FRONT PANEL ASSY

(Page 9)

3-3.CD MECHANISM SECTION

(Page 8)

3-2.MIC/ECHO BOARD

(Page 8)

SET

3-1.TOP CABINET,

V-OUT BOARD, DC FAN

(Page 7)

7

two screws

(+BVTP 3

×

10)

qh

two screws

(+BVTP 3

×

10)

qd

screw

(+BVTP 3

×

10)

qs

screw (+BVWH 3 ×10)

6

three screws

(+BVTP 3

×

10)

4

qk

rear panel

qj

DC fan

q;

tuner (FM/AM)

9

wire (flat type)

11p

a

a

b

b

5

top cabinet

1

three screws

(+KTP 3

×

12)

2

three screws

(+KTP 3

×

12)

3

six screws

(+BVTP 3

×

10)

8

three screws

(+BVTP 3

×

10)

qa

connector 4p
(CN202)

qf

V-OUT board

qg

connector 2p
(CN401)

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

3-1. TOP CABINET, V-OUT BOARD, DC FAN

8

HCD-GP6V

3-2. MIC/ECHO BOARD

3-3. CD MECHANISM SECTION

3

two screws

(+BVTP 3

×

10)

1

connector 4p
(CN501)

4

MIC/ECHO board

2

wire (flat type) 6p (CN502

)

6

four screws

(+BVTP 3 ×10)

3

screw (+BVTP 3 ×10)

8

wire (flat type) 5p (CN801

)

q;

CD mechanism section

7

4

wire (flat type) 11p (CN303)

5

wire 1p (CLP401)

9

connector 5p (CN1)

1

four claws

2

CD lid

9

HCD-GP6V

3-4. FRONT PANEL ASSY

3-5. CONTROL BOARD, SINGLE CASSETTE MECHANISM

1

two screws

(+KTP 3

×

12)

3

wire (flat type) 21p (CN302)

4

8

front panel assy

5

connector 6p

6

connector 5p (CN201)

2

wire (flat type) 6p (CN305

)

7

wire 1p (CLP201)

qa

single cassette mechanism
(CMAL1Z240A)

8

CONTROL board

1

four screws (+BVTP 3 × 10)

2

four screws (+BVTP 3 × 10)

3

five screws (+BVTP 3 × 10)

9

four screws
(+BVTP 3

×

10

)

6

wire (flat type) 21p (CN601)

4

wire (flat type) 5p (CN602)

5

wire (flat type) 6p (CN605)

7

wire (flat type)
8p (CN603)

q;

two clamp

10

HCD-GP6V

3-6. MAIN BOARD, POWER BOARD

qa

four screws

(+B 4

×

8)

8

heat sink assy

1

connector 11p (CN801)

a

a

q;

MAIN board

2

two screws (+BVTP 3 ×10)

3

screw (+BVTP 3 ×10)

4

holder heat sink

qs

silicon shield plate

6

two screws

(+BTP 2.6

×

8)

5

two screws

(+BVTP 3

×

10)

7

two screws

(+BVTP 3

×

10

)

qd

TRANSFORMER

board

qf

power transformer

9

wire (flat type)
6p (CN306)

11

HCD-GP6V

3-7. VCD BOARD, CD MECHANISM DECK (CDM55A-30BD61S)

qd

screw (+BVTP 3 × 10)

qa

two screws (+BVTP 3 × 10)

qs

holder, shield case

8

two screws (+BVTP 3 × 10)

q;

two screws (+BVTP 3 × 10)

9

VCD board

qf

CD holder

2

two screws (+BVTP 3 × 10)

qh

CD mechanism

deck

4

lid (VCD), shield case

3

wire assy

6

wire (flat type) 23p (CN802

)

1

wire (flat type) 9p (CN803)

7

wire (flat type) 11p (CN806)

5

connector
4p (CN804)

qg

CD plate

5

LOADING board

2

two screws (+BTP 2.6 × 6)

4

motor (LD) assy

(M901)

1

Remove the belt.

3

Remove soldering from the two points.

3-8. LOADING BOARD

12

HCD-GP6V

3-9. BD BOARD

2

Remove soldering

from the four points.

5

BD board

1

wire (flat type) 25p (CN103)

4

wire (flat type) 16

p

3

claw

2

tray

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.)

claw

claw

C

A

B

3-10. TRAY (CDM55D)

13

HCD-GP6V

4

two floating screw

s

(+PTPWH M2.6)

3

two floating screws

(+PTPWH M2.6)

1

floating screws

(+PTPWH M2.6)

2

5

BU holder (BU-30)

7

two insulators

6

two insulators

base unit
(BU-30BD61S)

8

wire (flat type) 9p (CN105)

3-11. BASE UNIT (BU-30BD61S)

14

HCD-GP6V

[Cold Reset]

• The cold reset clears all data including preset data stored in
the RAM to initial conditions. Execute this mode when re­turning the set to the customer.

Procedure:

1. Press the "/1 button to turn off the main power.

2. While depressing the x button, press the "/1 button.

3. The fluorescent indicator tube does not display any message
and the set is reset.

[Fluorescent Indicator Tube Test Mode]

• Fluorescent segments are tested when this test is activated.

Procedure:

1. Extract an AC plug.

2. While depressing the CD u button, insert an AC plug.

3. All segments of the fluorescent indicator tube turn on.

4. CD test mode is activated.

5. To e xit from this mode, press the "/1 button or disconnect the
power cord.

[Version Display Mode]

•The model and the version are displayed.

Procedure:

1. Press the "/1 button to turn the set on.

2. To enter the test mode, press tw o buttons x and "/1 simulta-
neously for more than five seconds. The model and the ver­sion are displayed.

[AMP Test]

•This mode is used to check the function of the amplifier.

Procedure:

1. Extract an AC plug.

2. While depressing the [MD] button, insert an AC plug to enter
the AMP test mode. The message “AMP TEST” is displayed.

3. The message “Volume MAX” is displayed, when pressing the
[VOLUME +] button. The message “Volume MIN” is displayed,
when pressing the [VOLUME --] button.

4. Each time pressing the [PLAY MODE/TUNING MODE] button,
the message “EQ MAX”, “EQ MIN” or “EQ FLAT” is dis­played in this order.

5. To release from this mode, disconnect the AC plug and turn
the power off.

[AM Channel Step 9 kHz/10kHz Selection Mode]

• Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step.

Procedure:

1. Set the function to AM.

2. While depressing the [TUNER/BAND] button, press the "/1
button.

3. The channel step is changed over.

[TC Test Mode]

Procedure:

1. Extract an AC plug.

2. While depressing the T APE nN button, insert an AC plug .

3. The message “TC TEST” is displayed and TC test mode is
activated.

• Zero Return

1. Press the + > M or – .m button.

2. The tape is rewound to the counter zero position.

• Automatic record/playback test

1. Press the [REC START/REC PAUSE] button.

2. The message “MD” is displayed and AUX input is selected.

3. The tape is rewound to the counter zero position and record­ing is started automatically.

4. When the x button is pressed, the tape is rewound to the
recording stated point and the set starts playback.

5. To e xit from this mode, press the "/1 button or disconnect the
power cord.

SECTION 4

TEST MODE

15

HCD-GP6V

SECTION 5

MECHANICAL ADJUSTMENTS

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)

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)

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

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

Mode

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

Torque meter Meter reading

16

HCD-GP6V

SECTION 6

ELECTRICAL ADJUSTMENTS

[Record/Playback Head Azimuth Adjustment]

Procedure:

1. Mode : Playback

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.

test tape
P-4-A100
(10kHz, –10dB)

MAIN board
J203
speaker terminal

level meter

set

+
–

L-CH
peak

R-CH
peak

screw
position

output
level

within
1 dB

L-CH
peak

R-CH
peak

screw
position

within 1dB

Signal Used forTape

P-4-A100

WS-48B

10 kHz, –10 dB

3 kHz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

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.

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)

3. Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

MAIN board
J203
speaker terminal

L

R

17

HCD-GP6V

RFDC signal waveform

Checking Location: BD board (Conductor side)

RFAC Level Check

Connection:

Procedure:

1. Connect an oscilloscope to test point TP6 (RFAC) and TP7
(VC) on the BD 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 RFAC
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

Checking Location: BD board (Conductor side)

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:

Procedure:

1. Connect an oscilloscope to test point TP4 (FE) and TP7 (VC)

on the BD 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 conf irm peak to peak le vel within 2 ± 1
Vp-p.

S-curve waveform

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: BD board (Conductor side)

RFDC Level Check

Connection:

Procedure:

1. Connect an oscilloscope to test point TP6 (RFDC) and TP7
(VC) on the BD 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.

+
–

BD board

TP4 (FE)

TP7 (VC)

oscilloscope

A

B

symmetry

within 2

±

1 Vp-p

+
–

BD board

TP6 (RFDC)

TP7 (VC)

oscilloscope

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

level: 0.7

±

0.2 Vp-p

+
–

BD board

TP6 (RFAC)

TP7 (VC)

oscilloscope

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

level: 1.0

±

0.4 Vp-p

18

HCD-GP6V

Connecting Location:

– BD BOARD (Conductor Side) –

IC101

TP7
(VC)

IC103

TP8
(RFAC)

TP6
(RFDC)

TP4
(FE)

TP2
(TE)

Ver 1.1