Sony HCD-V707 Service Manual

HCD-V707

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SERVICE MANUAL

TEL [phone] QQ 376315150 892498299

HCD-V707 is the tuner, deck, Video CD and
amplifier section in MHC-V707.

* Dolby noise reduction manufactured

under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol a
are trademarks of Dolby Laboratories
Licensing Corporation.

CD
Section

Tape deck
Section

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Model Name Using Similar Mechanism HCD-V4500
CD Mechanism Type
Base Unit Name BU-5BD21AL
Optical Pick-up Name
Model Name Using Similar Mechanism HCD-H881
Tape Transport Mechanism Type TCM-220WR2F

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Chinese Model

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E Model

Tourist Model

CDM38L-5BD21AL

KSS-213D/Q-NP

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SPECIFICATIONS

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– Continued on next page –

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MICROFILM

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MINI Hi-Fi COMPONENT SYSTEM

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CAUTION

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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 rear exterior.

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

The following caution label is located inside the unit.

MODEL IDENTIFICATION

– BACK PANEL –

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PART No.

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SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.

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REPLACE THESE COMPONENTS WITH SONY P AR TS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL
OR IN SUPPLEMENTS PUBLISHED BY SONY.

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MODEL PART NO.
Malaysia, Singapore 4-991-746-0π
Taiwan 4-991-746-1π
Chinese 4-991-746-2π
Hong Kong 4-991-746-5π
Tourist 4-991-746-6π
Saudi Arabia, Thai 4-991-746-7π
Indonesia 4-991-747-4π

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TABLE OF CONTENTS

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1. GENERAL .................................................................. 4

2. DISASSEMBLY ......................................................... 7

3. TEST MODE ............................................................. 16

4. MECHANICAL ADJUSTMENTS .................... 19

5. ELECTRICAL ADJUSTMENTS

DECK Section .................................................................19

CD Section....................................................................... 22

VIDEO Section................................................................ 23

6. DIAGRAMS

6-1. IC Pin Function Description ............................................ 24

6-2. Printed Wiring Board —BD Section— ...........................33

6-3. Schematic Diagram —BD Section— .............................. 35

6-4. Printed Wiring Boards —CD MOTOR Section— .......... 37

6-5. Schematic Diagram —CD MOTOR Section—............... 39

6-6. Printed Wiring Boards —VIDEO Section—................... 42

6-7. Schematic Diagram —VIDEO Section— ....................... 45

6-8. Schematic Diagram —DECK Section—......................... 51

6-9. Printed Wiring Boards —DECK Section— .................... 55

6-10. Printed Wiring Boards

—MAIN/DECK/POWER SUPPLY Section— ............... 58

6-11. Schematic Diagram

—MAIN/POWER SUPPLY Section— ........................... 61

6-12. Schematic Diagram —PANEL Section— ....................... 66

6-13. Printed Wiring Boards —PANEL Section—................... 71

6-14. Printed Wiring Boards

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—POWER AMP/KEY CONTROL Section—................ 75

6-15. Schematic Diagram

—POWER AMP/KEY CONTROL Section—................ 76

7. EXPLODED VIEWS ...............................................88

8. ELECTRICAL PARTS LIST ................................ 99

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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
pick-up 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 chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

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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.

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SERVICING NOTES

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LOCATION OF CONTROLS

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– Front Panel –

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SECTION 1

GENERAL

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123 567 84

!•
!ª

@º
@¡

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@™
@£
@¢
@∞
@§

#º@ª@•@¶

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!¡
!™
!£
!¢
!∞
!§
!¶

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1 POWER button
2 0 button
3 ) button
4 DISC 1 button
5 DISC 2 button
6 DISC 3 button
7 p button
8 · ∏ button
9 § OPEN/CLOSE button
0 CD disc tray
!¡ FUNCTION button
!™ KARAOKE PON/MPX button
!£ VOLUME control knob
!¢ TUNER MEMORY button
!∞ TUNER/BAND button and indicator
!§ STEREO/MONO button
!¶ TUNING MODE button
!• DISC SKIP EX-CHANGE button
!ª TIMER SELECT button
@º CLOCK/TIMER SET button
@¡ SLEEP button
@™ P FILE MEMORY button
@£ P FILE button
@¢ MUSIC button
@∞ MOVIE button
@§ GAME button
@¶ GROOVE button and indicator
@• ENTER/NEXT button and indicator

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@ª SURROUND button
#º DBFB button

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#§
#¶
#•

#ª
$º

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#£

#™

#¡

$¡ $™$£$¢$∞

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#¢
#∞

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#¡ VCD indicator
#™ PBC indicator
#£ AUTO PBC indicator
#¢ PLAY MODE button
#∞ 1/ALL DISCS button
#§ DIRECTION button
#¶ DISPLAY/DEMO button
#• NON-STOP button and indicator
#ª PHONES jack
$º MIX MIC jack
$¡ DJ MIX WAVE button
$™ MIC LEVEL control knob
$£ ECHO LEVEL control knob
$¢ DJ MIX LOOP button
$∞ DJ MIX FLASH button

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%§
%¶
%•
%ª

^º
^¡
^™
^£
^¢

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$§ $¶ $•

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^§ ^¶^• ^ª&º^∞

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$ª
%º

%¡
%™
%£
%¢
%∞

$§ LOW FREQUENCY button
$¶ Jog dial knob and indicator

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$• HIGH FREQUENCY button
$ª Fluorescent indicator tube
%º EFFECT ON/OFF button and indicator
%¡ 0 button (deck B side)
%™ ) button (deck B side)
%£ · button and indicator (deck B side)
%¢ ª button and indicator (deck B side)
%∞ p button (deck B side)
%§ SELECT button
%¶ RETURN button
%• NEXT button
%ª PREV button
^º ) button (deck A side)
^¡ 0 button (deck A side)
^™ ª button and indicator (deck A side)
^£ · button and indicator (deck A side)
^¢ p button (deck A side)
^∞ § button (deck A side)
^§ Cassette holder (deck A side)
^¶ HIGH SPEED DUBBING button
^• CD SYNCHRO button
^ª r REC button and indicator
&º P PAUSE button and indicator
&¡ Cassette holder (deck B side)
&™ § button (deck B side)

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– Rear Panel –

TEL

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1 FM ANTENNA terminal
2 AM ANTENNA terminal
3 SYSTEM SELECT switch (NTSC/AUTO/PAL select)
4 VOLTAGE SELECTOR (except Saudi Arabia, Malay-

sia, Thai models)

5 CD DIGIT AL OUT OPTICAL
6 VIDEO/MD (AUDIO) IN pin jack
7 VIDEO/MD (AUDIO) OUT pin jack
8 SUPER WOOFER output pin jack
9 SPEAKER output terminal
0 VIDEO OUT pin jack
!¡ S VIDEO OUT connector

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

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SECTION 2

DISASSEMBLY

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CASE

(Page 8)

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OPTICAL PICK-UP
CLEANING
(Page 8)

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CD MECHANISM DECK SECTION
(CDM38L-5BD21AL)
(Page 9)

BASE UNIT
(BU-5BD21AL)
(Page 9)

BD BOARD
(Page 10)

OPTICAL PICK-UP
(KSS-213D/Q-NP)
(Page 10)

TRAY SECTION
(Page 11)

SLED MOTOR
(M102)
SPINDLE MOTOR
(M101)
(Page 10)

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MAIN BOARD
(Page 15)

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FRONT PANEL SECTION
(Page 12)

TAPE MECHANISM DECK SECTION
(TCM-220WR2F)
(Page 12)

CAPSTAN
MOTOR (M1)
(Page 13)

BELT
(Page 14)

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SLIDER (HEAD)
ASS’Y
(Page 14)

MAGNETIC
HEAD
(Page 15)

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

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CASE

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two screws
(case 3 TP2)
(3 × 8)

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screw (case 3 TP2)
(3 × 10)

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three screws
(BVTT 3 × 8)

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Remove the case to
direction of the arrow.

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screw
(case 3 TP2)
(3 × 10)

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OPTICAL PICK-UP CLEANING

1

In sled servo mode (see page

16), slide the optical pick-up a
little in arrow direction.

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2

Insert an applicator into a hole
of the chucking arm and clean
the lens.

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two screws
(case 3 TP2)
(3 × 8)

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Note 1: In cleaning the lens, do not apply an excessive force.

Note 2: In cleaning, do not use a cleaner other than exclusive
Note 3: Wipe the objective lens spirally from center toward

As the optical pick-up is vulnerable, application of

excessive force could damage the lens holder.
cleaning liquid (KK-91 or isopropyl alcohol).
outside. (See Figure A)

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(Figure A)

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CD MECHANISM DECK SECTION (CDM38L-5BD21AL)

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Turn the cam to direction
of the arrow A.

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loading panel

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screw
(BVTP 3 × 10)

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A

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screw
(BVTP 3 × 8)

screw
(BVTP 3 × 8)

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B

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Removal the CD mechanism deck sec­tion (CDM38L-5BD21AL) to direction of
the arrow B.

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flat wire (29 core)
(CN101)

two screws
(BVTP 3 × 8)

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two connectors
(CN203, 204)

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BASE UNIT (BU-5BD21AL)

2

Pull the tray.

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Push the tray.

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two yoke brackets

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boss

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screw
(BVTP 3 × 10)

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base unit
(BU-5BD21AL)

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BD BOARD

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two screws
(PTPWH M2.6 × 6)

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two springs

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screw
(BVTP 2.6 × 8)

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Removal
the four solders.

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two screws
(PTPWH M2.6 × 6)

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optical pick-up
section

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two springs

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flat wire (16 core)
(CN102)

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BD board

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limit switch
(S101)

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OPTICAL PICK-UP (KSS-213D/Q-NP), SLED MOTOR (M102), SPINDLE MOTOR (M101)

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optical pick-up (KSS-213D/Q-NP)

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spindle motor
(M101)

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sled shaft

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sled motor
(M102)

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two screws
(P 2 × 3)

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TRAY SECTION

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flat wire (8 core)
(CN702)

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claw

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B

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claw

A

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flat wire

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two claws

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2

Pull the tray.

5

Removal the tray.

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Note: When installing the tray, take care so that the collars A and B

are properly inserted into the slots.

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Note: When installing the tray, pull around the flat wire

to pass through the claw A and claw B, as
shown in the figure.

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Turn the cam to direction
of the arrow.

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slots

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collar

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collar

A

FRONT PANEL SECTION

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loading panel

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screw
(BVTP 3 × 10)

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Turn the cam to
direction of the
arrow A.

A

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screw
(BVTP 3 × 10)

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2

Pull the tray

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front panel section

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two claws

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five screws
(BVTT 3 × 6)

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TAPE MECHANISM DECK SECTION (TCM-220WR2F)

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tape mechanism deck
section
(TCM-220WR2F)

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flat wire (17 core)
(CN102)

flat wire (11 core)
(CN206)

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three screws
(BVTP 2.6 × 8)

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flat wire (21 core)
(CN205)

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Open the
cassette lids.

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Push the two buttons.

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CAPSTAN MOTOR (M1)

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Removal the AUDIO board
to direction of the arrow A.

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connector
(CN651)

four screws
(BTP 2.6 × 4)

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A

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Removal the capstan motor (M1)
to direction of the arrow B.

4

Break the soldering
of motor lead.

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claw

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B

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two screws
(BTP 2.6 × 8)

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Hang the two belts.

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BELT

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belt (FR)

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capstan motor

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belt B

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belt (FR)

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belt A

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SLIDER (HEAD) ASS’Y

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tension spring

pinch lever (REV) ass’y

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pinch lever (FWD) ass’y

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two clips

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claw

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Break the soldering of
flexible flat cables.

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MAGNETIC HEAD

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azimuth adjustment spring

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magnetic head

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Removal the slider (REV slider)
to direction of the arrow.

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tension spring (1)

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two azimuth adjustment screws

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MAIN BOARD

1

connector
(CN901)

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three screws
(BVTP 3 × 8)

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two connectors
(CN105, 106)

2

flat wire (15 core)
(CN201)

3

two screws
(P 2 × 6)

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2

flat wire (13 core)
(CN202)

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two screws
(BVTP 3 × 8)

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connector
(CN101)

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MAIN board

IC201

SECTION 3

TEST MODE

MC COLD RESET

• The cold reset clears all data including preset data stored in the

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RAM to initial conditions. Execute this mode when returning the
set to the customer.

Procedure:

1. Press three buttons NEXT , ENTER/NEXT , and DISC 1 si­multaneously.

2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.

CD DELIVERY MODE

• This mode moves the pick-up to the position durable to vibra-

tion. Use this mode when returning the set to the customer after
repair.

Procedure:

1. Press POWER button to turn the set ON.

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2. Press DIRECTION button and POWER button simulta­neously.

3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.

MC HOT RESET

• This mode resets the set with the preset data kept stored in the

memory. The hot reset mode functions same as if the power cord
is plugged in and out.

Procedure:

1. Press three buttons NEXT , ENTER/NEXT , and DISC 2 si­multaneously.

2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.

SLED SERVO MODE

• This mode can run the CD sled motor freely. Use this mode, for

TEL

instance, when cleaning the pick-up.

Procedure:

1. Select the function “CD”.

2. Press three buttons NEXT , ENTER/NEXT , and

FUNCTION simultaneously.

3. The Sled Servo mode is selected, if “CD” is blanking on the
fluorescent indicator tube.

4. With the CD in stop status, press ) button in CD section to
move the pick-up to outside track, or 0 button to inside track.

5. To exit from this mode, perform as follows:

1) Move the pick-up to the most inside track.

2) Press three buttons in the same manner as step 2.

Note:

• Always move the pick-up to most inside track when exiting from

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

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

chipped.

CHANGE-OVER OF FUNCTION NAME

• The FUNCTION name of external input terminal can be changed

over to “VIDEO” or “MD”.

Procedure:

1. Press POWER button to turn the set OFF.

2. Press POWER button together with FUNCTION button, and
the power is turned on, the display of fluorescent indicator tube
changes to “MD” or “VIDEO” instantaneously, and thus the
FUNCTION is changed over.
It is set to “VIDEO” at shipment.

3

7

6

3

1

13942296513

5

1

5

CHANGE-OVER OF AM TUNER STEP BETWEEN 9 kHz
AND 10 kHz

0

• A step of AM channels can be changed over between 9 kHz and
10 kHz.

Procedure:

1. Press POWER button to turn the set ON.

2. Select the function “TUNER”, and press TUNER/BAND

button to select the BAND “MW”.

3. Press POWER button to turn the set OFF.

4. Press ENTER/NEXT and POWER buttons simultaneously,

and the display of fluorescent indicator tube changes to “MW
9 k STEP” or “MW 10 k STEP”, and thus the channel step is
changed over.
Be sure not to change with carelessness.

LED AND FLUORESCENT INDICA TOR TUBE ALL LIT, KEY
CHECK MODE

Procedure:

1. Press three buttons NEXT , ENTER/NEXT , and DISC 3 si-

multaneously.

2. LEDs and fluorescent indicator tube are all turned on.

Press DISC 2 button, and the key check mode is activated.

3. In the key check mode, the fluorescent indicator tube displays

“K 1 J0 V0”. Each time a b utton is pressed, “K”value increases.
However, once a button is pressed, it is no longer taken into
account.
“J” value increases like 1, 2, 3 ... if rotating JOG dial knob in
“+” direction, or it decreases like 0, 9, 8 ... if rotating in “–”
direction.
“V” value increases like 1, 2, 3 ... if rotating VOLUME knob
in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “–”
direction.

4. To exit from this mode, press three b uttons in the same manner

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SELF-DIAGNOSIS

This model has the self-diagnosis function for the video and audio
decoder sections.
Immediately after the power on, the self-diagnosis function
searches each operation of IC’s around the mechanism controller
(IC701).
The LED (D701) on the VIDEO board indicates their results.

LED (D701) INDICATION SYMPTOM

Light No error
1 time blinking (Repeatedly) External RAM (S-RAM) error

2 times blinking (Repeatedly) Video decoder section error

3 times blinking (Repeatedly) Video RAM (D-RAM) error

4 times blinking (Repeatedly) Audio decoder section error

[VIDEO BOARD] (SIDE-A)

7

3

as step 1, or disconnect the power cord.

IC701

8

6

3

IC201

9

1

5

2

1

4

0

5

(IC751)

(IC201)

(IC251)

(IC201)

9

8

9

8

2

4

2

9

8

9

2

9

9

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D701

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– 16 –

1

IC771

6

3

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IC901

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AGING MODE

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TEL [phone] QQ 376315150 892498299

This mode can be used for operation check of CD section and tape

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deck section.

• If an error occurred:
The aging operation stops.

• If no error occurs:
The aging operation continues repeatedly.

1. Aging Mode in CD Section

1-1. Operating Method of Aging Mode

1. Set discs in DISC1 and DISC2 trays.

2. Select the function “CD”.

3. Press three buttons NEXT , ENTER/NEXT ,

4. The aging mode is activated, if a roulette mark on the fluo-

5. In the aging mode, the aging is executed in a sequence given

6. To exit from the aging mode, pr ess POWER button to turn

• If a button other than buttons In CD section is pressed during
aging, the aging in the CD section is finished.

• To e xecute aging to the tape deck section successively , press ·
button in the deck A.
“AGING” is displayed on the fluorescent indicator tube. (For
the aging in tape deck, see “2. Aging Mode in Tape Deck Sec­tion”.

1-2. Operation during aging Mode
In the aging mode, the program is executed in the following se­quence.

TEL

1. The disc table is ejected.

2. The disc tray turns to select a disc. (For a disc selection

3. TOC of disc is read.

4. The pickup accesses to the last track.

5. A disc is ejected.

6. Steps 2 through 5 are repeated.

7

3

and KARAOKE PON/MPX simultaneously.

rescent indicator tube is blinking.

in “1-2. Operation during Aging Mode”.
The aging continues unless an alarm occurred.

the set OFF.

6

3

1

5

1

13942296513

sequence, see Section 1-3.)

5

0

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7. In the aging mode, the aging is executed in a sequence given

8. To exit from the aging mode, press POWER button to turn

2-2. Operation during Aging Mode
In the aging mode, the program is executed in the following se­quence.

1. A tape on FWD side is played for one minute.

2. PAUSE STOP is made.

3. Recording is made for 3 minutes. (For the deck not having

4. FF is executed up to the end of tape.

5. A tape is reversed, and the tape on REV side is played for

6. PAUSE STOP is made.

7. Recording is made for 3 minutes. (For the deck not having

8. FF is executed up to the end of tape.

9. Steps 1 through 8 are executed for the other deck.

10. Steps 1 through 9 are repeated unless an alarm occurred.

2-3. Deck Selection Sequence

• During the aging mode, decks are selected in the following se­quence:

7

3

in “2-2. Operation during Aging Mode”.

9

8

The aging continues unless an alarm occurred.

the set OFF.

the record function, the play is executed. In this case, ·
LED does not light up.)

one minute.

the record function, the play is executed. In this case, ª
LED does not light up.)

Deck A (FWD) → Deck A (REV)

↑↓

Deck B (REV) ← Deck B (FWD)

5

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6

2

1

5

4

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8

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2

8

4

2

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8

9

2

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1-3. Disc Selection Sequence

• During the aging mode, discs are selected in the following se­quence:

Disc 1 → Disc 2

↑↓

Disc 2 ← Disc 1

2. Aging Mode in Tape Deck Section

2-1. Operating Method of Aging Mode

1. Load a commercially available 10-minute tape into the decks
A and B respectively.
(If a 10-minute tape is not available, another tape may be
used but a cycle time will be longer.)

2. Select the function “TAPE”.

3. Rewind tapes in advance by pressing 0 button respec­tively on decks A and B.

4. Press three buttons NEXT , ENTER/NEXT ,
and KARAOKE PON/MPX simultaneously.

5. Press · button on deck A. (This button triggers the ag­ing mode. )

6. The aging mode is activated if “AGING A” is displayed on
the fluorescent indicator tube.

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– 17 –

VIDEO CD COLOR BAR MODE

On this mode, the data of the color bar signal as a picture signal

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and the 1 kHz sine wave signal as a sound signal are output by the
mechanism controller (IC701) for the video CD signal check.
When measurement of the voltage and waveform on the VIDEO
board, perform it in this mode.
For reference, the color bar signal can be observed at J9001
(VIDEO OUT) and the sound signal can be observed at J101
(VIDEO/MD (AUDIO) OUT) using an oscilloscope.

Procedure:

1. Turned power switch on.

2. Press the FUNCTION button to select the CD.

3. Connect the SL701 on the VIDEO board with solder.

4. After measuring, remove the soldering installed.

TEL [phone] QQ 376315150 892498299

set

B

A

7

3

J9001 (VIDEO OUT)

C

6

75

H

3

oscilloscope

Ω

1

+
–

5

1

5

E-F BALANCE MODE

Refer to the SECTION 6 ELECTRICAL ADJUSTMENTS page

0

22.

Procedure:

1. Turned power switch on.

2. Press the FUNCTION button to select the CD.

3. Connect the SL701 and SL703 on the VIDEO board with sol­der.

4. Press the · ∏ button in playback.

5. Every pressing the REPEA T button on the remote commander ,
the tracking servo and sledding servo are turned on or off.

6. When the servo is off, the counter on front panel will not be
changed.

7. After measuring, remove the soldering installed.

8

9

2

4

9

8

2

9

9

TEL [phone] QQ 376315150 892498299

A = 0.9 to 1.1 Vp-p
B = 0.678 to 0.75 Vp-p
C = 0.214 to 0.328 Vp-p

TEL

Fig. 1 Video CD Color Bar Signal Output from J9001 (VIDEO OUT)

[VIDEO BOARD] (SIDE-B)

SL703

SL702

SL701

13942296513

IC251

IC751

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1

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1

5

0

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2

4

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2

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– 18 –

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SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION

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TEL [phone] QQ 376315150 892498299

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

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swab:

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

Back Tension (0.026 – 0.082 oz•inch)

Back Tension (0.026 – 0.082 oz•inch)

• Tape T ension Measurement

Forward CQ-403A more than 100 g (3.53 oz)

TEL

Reverse CQ-403R more than 100 g (3.53 oz)

7

3

record/playback head pinch roller
erase head rubber belts
capstan idlers

Mode Torque Meter Meter Reading

Forward CQ-102C
Forward

Reverse CQ-102RC
Reverse

FF, REW CQ-201B

Mode Tension Meter Meter Reading

6

CQ-102C

CQ-102RC

3

1

5

1

5

36 to 61g•cm

(0.50 – 0.84 oz•inch)

2 to 6g•cm

36 to 61g•cm

(0.50 – 0.84 oz•inch)

2 to 6g•cm

61 to 143g•cm

(0.85 – 1.98 oz•inch)

13942296513

0

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DECK SECTION 0 dB=0.775 V

1. Demagnetize the record/playback head with a head demagne­tizer. (Do not bring the head demagnetizer close to the erase
head.)

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

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

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 R-ch.

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

8. Set to test mode. (Press key switch same time

• Test T ape

Record/Playback Head Azimuth Adjustment

DECK A DECK B

Note: Perform this adjustments for both decks.
Procedure:

7

3

1. Mode: Playback (FWD)

SECTION 5

ELECTRICAL ADJUSTMENTS

4

2

9

8

NEXT ENTER/NEXT and EFFECT ON/OFF buttons.)

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

P-4-L300 315 Hz, 0 dB Level Adjustment

0

5

1

5

1

3

6

9

8

9

2

8

4

2

9

8

9

2

9

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9

TEL [phone] QQ 376315150 892498299

test tape
P-4-A100
(10 kHz, –10 dB)

set

MAIN board
CN207
pin

3

(L-CH)

pin

1

(R-CH)

MAIN board
CN207
pin

2

(GND)

level meter

+
–

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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

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that outputs match within 1 dB of peak.

L-CH
peak

Screw
position

TEL [phone] QQ 376315150 892498299

3. Mode: Playback (FWD)

test tape
P-4-A100
(10 kHz, –10 dB)

TEL

4. Repeat steps 1 to 3 in playback (REV) mode.

5. After the adjustments, apply suitable locking compound to the
pats adjusted.

Adjustment Location: Playback Head (Deck A)

7

3

output
level

R-CH
peak

set

in phase 45°90°135°180

13942296513

6

within
1 dB

L-CH
peak

MAIN board
CN207

pin
pin 2 (GND)

1

(R-CH)

pin

waveform of oscilloscope

good

Record/Playback Head (Deck B)

3

3

(L-CH)

1

R-CH
peak

oscilloscope

V

wrong

5

within
1 dB

H

°

1

Screw
position

5

Tape Speed Adjustment DECK A

Note: Start the Tape Speed adjustment as below after setting to

0

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the test mode.
In the test mode, the tape speed is high during pressing the
HIGH SPEED DUBBING button.

Procedure:

1. Turn the power switch on.

2. Press the NEXT button, ENTER/NEXT button and
EFFECT ON/OFF button simultaneously.
To exit from the test mode, press the POWER button.

Mode: Playback (FWD)

test tape
WS-48B
(3 kHz, 0 dB)

1. Insert the WS-48B into the deck A and the blank tape into the
deck B.

2. Press the r REC button and · button on the deck B. Then
the deck B is at recording mode.

3. Set the deck A to playback mode.

4. Keep pressing the HIGH SPEED DUBBING button in play­back mode.
Then at HIGH speed mode.

5. Adjust RV652 on the AUDIO board so that frequency counter
reads 6,000 ± 90 Hz.

6. Take off the HIGH SPEED DUBBING button.

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7. Adjust RV651 on the AUDIO board so that frequency counter

8. Frequency difference between deck A and deck B the begin-

Adjustment Location: AUDIO board (See page 21)
Sample value of Wow and Flutter: 0.3% or less W.RMS

7

3

Then at NORMAL speed mode.
reads 3,000 ± 90 Hz.
ning of the tape should be within ± 1.5 %.

8

6

3

9

set

1

2

MAIN board
CN207 (pin

5

1

5

4

9

frequency counter

+
–

3

0

(WS-48B)

: L-CH)

9

8

2

(pin 1 :R-CH)

8

4

2

9

8

9

2

9

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forward

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reverse

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Playback level Adjustment DECK A DECK B

Procedure:

Mode: Playback (FWD)

test tape
P-4-L300
(315 Hz, 0 dB)

set

MAIN board
CN207 (pin

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.

Adjustment Level:

CN207 PB level: 301.5 to 338.3 mV (– 8.2 to – 7.2 dB) level
difference between the channels: within ± 0.5 dB

Adjustment Location: AUDIO board (See page 21)

u

1

6

3

.

c

o

(pin

level meter

3

: L-CH)

1

: R-CH)

m

+
–

– 20 –

RV1501

IC1501

CN205

CN207

RV1551

RECORD LEVEL

IC301

IC201

1

21 1
22 42

3

RECORD

BAIS

TAPE SPEED

(NORMAL)

RV651

®

(HIGH)
RV652

®

RV311

L

®

RV411

R

®

PB

LEVEL

RV441RV341

RV301

®

L

RV401

®

R

R

L

– DECK B –

– DECK A –



PB LEVEL















Record bias Current Adjustment DECK B

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TEL [phone] QQ 376315150 892498299

Procedure:

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1. Mode: Record

AF OSC

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV341 (L­CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1
and 2.
Adjustable limits: Playback output of 315 Hz to playback out-

TEL

Adjustment Location: AUDIO board

Record Level Adjustment DECK B

Procedure:

1. Mode: Record

7

3

6

pin 6 (L-CH) of IC1501 on the MAIN board.
pin

#¶

(R-CH) of IC1501 on the MAIN board.

1) 315 Hz

2) 10 kHz

attenuator

pin 2 (GND) of CN207 on the MAIN board.

recorded
portion

set

MAIN board
CN207 (pin

put of 10 kHz: ±0.5 dB

1

3



50 mV (–23.8 dB)




Ω

600

3

(pin

1

5

set

level meter

: L-CH)
: R-CH)

13942296513

1

+
–

5

0

blank tape
CS-123

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Adjustment and Connection Location:

[AUDIO BOARD] (Conductor Side)

[MAIN BOARD] (Component Side)

7

3

8

6

3

9

1

5

2

1

5

4

0

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8

9

8

2

4

2

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8

9

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9

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pin

6

(L-CH) of IC1501 on the MAIN board.

pin

#¶

(R-CH) of IC1501 on the MAIN board.

AF OSC

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the R V1501 (L­CH) and RV1551 (R-CH) on the MAIN board to repeat steps 1
and 2.

Adjustable limits:

CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

w

315 Hz, 50 mV (–23.8 dB)

600

attenuator

pin

2

(GND) of CN207 on the MAIN board.

recorded
portion

w

.

Ω

set

MAIN board
CN207 (pin

(pin

xia

blank tape
CS-123

set

level meter

+
–

3

: L-CH)

1

: R-CH)

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6

– 21 –

3

.

c

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m

+
–

BD board

TP (TE)

TP (VC)

oscilloscope

(DC range)

CD SECTION

7

Q

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Notes:

1. CD block basically constructed to operate without adjustment.
Therefore, check each item in order given.

2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.

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

4. Clean an 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:

TEL [phone] QQ 376315150 892498299

Procedure:

1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board.

2. Connect the TP (FEI) and TP (VC) with lead wire.

3. Turned power switch on.

4. Put 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.)

5. Confirm that the oscilloscope waveform (S-curve) is symmetri­cal between A and B. And confirm peak to peak level within

3.0 ± 1.0 Vp-p.

S-curve waveform

TEL

3

BD board

TP (FE)

TP (VC)

13942296513

6

1

3

oscilloscope

+
–

symmetry

A

B

5

1

5

within 3.0 ± 1.0 Vp-p

RF signal waveform

0

When observing the eye pattern, set the oscilloscope for A C range
and raise vertical sensitivity.

E-F Balance (Traverse or 1 Track Jump) Check

Connection:

When a general remote commander (RM-SV808) is used
(Traverse Check):
Procedure:

1. Connect the oscilloscope to TP (TE) and TP (VC) on BD board.

2. Turned power switch on.

3. Connect the SL702 and SL703 on the VIDEO board with sol­der.

4. Put disc (YEDS-18) in and press the ·∏ button, and play
the number five track.

5. Press the REPEAT button on the remote commander. (The
tracking servo and the sledding servo are turned off.)

7

3

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6. Confirm that the level B of the oscilloscope’s waveform and
the A (DC voltage) of the center of the traverse waveform.
Confirm the following:
A/B × 100 = less than ±22 %

8

6

3

9

1

5

2

1

5

4

0

VOLT/DIV: 200 mV

9

TIME/DIV: 500 ns
(with the 10: 1 probe
in use)

level: 1.3 Vp-p

2

9

8

8

+0.25
–0.20

4

2

9

8

9

2

9

9

TEL [phone] QQ 376315150 892498299

9

6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure that 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.

RF Level Check

Connection:

oscilloscope

(AC range)

BD board

TP (RF)

TP (VC)

Procedure:

1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board.

2. Turned power switch on. (stop mode)

3. Put disc (YEDS-18) in and press the ·∏ button.

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

Note: Clear RF signal waveform means that the shape “≈ ” can

be clearly distinguished at the center of the waveform.

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.

+
–

xia

Traverse waveform

0 V

7. Press the REPEAT button on the remote commander. (The
tracking servo and the sledding servo are turned on.) Confirm
that the C (DC voltage) is almost equal to the A (DC voltage) is
step 6.

Traverse waveform

0 V

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y

8. After check, remove the soldering installed in step 3.

u

1

6

3

– 22 –

Tracking servo

Sled servo

.

c

OFF

o

Center of the waveform

B

A (DC voltage)

level: 1.3 ± 0.6 Vp-p

C (DC
voltage)

Tracking servo
Sled servo
ON

m

)

+
–

TP410 (DCLK)

VIDEO board

frequency counter

When a general remote commander is not used (1 Track Jump

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TEL [phone] QQ 376315150 892498299

Check):

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Procedure:

1. Connect the oscilloscope to TP (TE) and TP (VC) on BD board.

2. Turned power switch on.

3. Put disc (YEDS-18) in and press the ·∏ button, and play

the number five track.

4. Press the ·∏ button. (Becomes the 1 track jump mode)

5. Confirm that the level B of the oscilloscope's waveform and
the A (DC voltage) of the center of the traverse waveform.
Confirm the following:

1 track jump waveform

0V

RF PLL Free-run Frequency Check

Connection:

TEL

7

3

A – B

2 (A + B)

level : 1.3

BD board

TP (PLCK)

6

× 100 = ±7 (%)

±

1

3

0.6 Vp-p

frequency counter

+
–

13942296513

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1

5

Center of the waveform

B

A (DC voltage

symmetry

0

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VIDEO SECTION

Frequency Adjustment

Connection:

Procedure:

1. Connect the frequency counter to TP410 (DCLK) on VIDEO
board.

2. Turned power switch on.

3. Press the FUNCTION button to select the CD.

4. Adjust CT401 on the VIDEO board so that the frequency counter
reading 13.5 MHz ± 40 Hz at stop status.

Adjustment Location:

[VIDEO BOARD] (SIDE-B)

7

3

8

6

3

9

1

5

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TP410
(DCLK)

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CT401

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IC402

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Procedure:

1. Connect the frquency counter to TP (PLCK) on the BD board.

2. Turned power switch on.

3. Put disc (YEDS-18) in and press the ·∏ button, and play

the number five track.

4. Confirm that the reading on frequency counter is 4.3218 MHz.

Connection Location:

[BD BOARD] (SIDE-A)

(FEL)

(FE)

(FE)

(PLCK)

IC103

IC101

(RF)

(VC)

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SECTION 6

DIAGRAMS

6-1. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC301 µPD780016YGF-015-3BA (MASTER CONTROLLER)

Q

Q

Pin No. Pin Name I/O Function

1 TA-MUTE O
2 DBFB-H/L O
3 427-LAT O
4 K-CON-LAT O
5 K-CON-ON O
6 F-RELAY O
7 R-RELAY O
8 PL-RELAY O
9 TEST I

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10 X2 O
11 X1 I
12 VDD —
13 XT2 O
14 XT1 I

15 RESET I

16 (INT/IN) I
17 (INT/IN/OUT) I
18 SCOR O
19 SOFT-TEST O
20 AC-CUT I

TEL

21 RDS-INT I
22 RDS-DATA I
23 VDD —
24 AVDD —
25 ADJ I
26 A-SHUT I
27 B-SHUT I
28 B-HALF I
29 CLK-CHECK I
30 SPEC-IN I
31 ADJ2 I
32 DEMO-MODE I
33 AVSS —
34 SQ-DATA-IN I
35 — —
36 D.OUT ON/OFF O
37 SW-ON/OFF O
38 FUNC1 I
39 FUNC2 I
40 VSS —
41 VOL-LAT O
42 PL-LAT O
43 COM-DIN I

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44 COM-DOUT O

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Line mute control signal output terminal “L”: mute on
DBFB normal/high selection signal output terminal “L”: DBFB high, “H”: DBFB low
Serial data latch pulse output to the electrical volume (IC201)
Serial data latch pulse output to the key control (IC1401)
On/off selection signal output of the key control circuit “L”: on
Relay drive signal output for the main speaker (front speaker) “H”: on
Relay drive signal output terminal Not used (open)
Relay drive signal output terminal Not used (open)
Connected to ground
Main system clock output terminal (5 MHz)
Main system clock input terminal (5 MHz)
Power supply terminal (+5V)
Sub system clock output terminal (32.768 kHz)
Sub system clock input terminal (32.768 kHz)
System reset signal input from the reset signal generator (IC302) “L ”: reset For several

hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
Connected to ground
Connected to ground
Subcode sync (S0+S1) detection signal input terminal Not used (fixed at “L”)
Output terminal for the software test (open)
AC off detection signal input from the reset signal generator (IC302)
Serial data reading clock signal input for the radio data system Not used (fixed at “L”)
Serial data input for the radio data system Not used (open)
Power supply terminal (+5V)
Power supply terminal (+5V) (for A/D conversion)
Setting terminal for the test Normally: “H”
Shut off detection signal input from the deck-A reel pulse detector (Q1001)
Shut off detection signal input from the deck-B reel pulse detector (Q1002)
Detection input from the deck-B half detect switch (S1007)
Not used (fixed at “L”)
Setting terminal for the version Fixed at “L”
Setting terminal for the test Normally: “L”
Setting terminal for the demonstration H/L Fixed at “L”
Ground terminal (for A/D conversion)
Sub-code Q data input terminal Not used (fixed at “L”)
Not used (open)
Power on/off selection signal output for the CD digital out optical “H”: power on
Not used (open)
Setting terminal for the function 1 Fixed at “L”
Setting terminal for the function 2 Fixed at “L”
Ground terminal
Serial data latch pulse output terminal Not used (open)
Serial data latch pulse output terminal Not used (open)
Serial data input terminal Not used (fixed at “L”)

xia

Serial data output to the electrical volume (IC201), DJ effect controller (IC401), and key
control (IC1401)

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Pin No. Pin Name I/O Function

45 COM-CLK O

46 CD-POWER O

Power on/off selection signal output for the CD circuit “H”: power on

47 CD-DATA O

Serial data output terminal Not used (open)

48 CD-CLK O

Serial data transfer clock signal output terminal Not used (open)

49 MSM-CND O

Command data output terminal Not used (open)

50 MSM-BUSY I

Busy signal input terminal “L”: busy Not used (fixed at “L”)

51 MSM-LAT O

Serial data latch pulse output terminal Not used (open)

52 MSM-NAR I

NAR signal output terminal Not used (open)

53 MSM-CH O

Channel select output terminal Not used (open)

54

O

MD/VIDEO input gain control signal output terminal “L”: VIDEO, “H”: MD

55 IIC-DATA I/O

56 IIC-CLK I/O

57 XRST O

Reset signal output to the IIC interface controller (IC901) “L”: reset

58 XLT O

Serial data latch pulse output terminal Not used (open)

59 FOCUS-SW O

Focus control signal output terminal Not used (open)

60 TBL-L O

Motor drive signal output to the disc tray turn motor driver (IC701)

61 TBL-R O

Motor drive signal output to the disc tray turn motor driver (IC701)

62 TRAY-LED O

LED on/off control signal output for the CD tray LED Not used (open)

63 LOAD-OUT O

Motor drive signal output to the disc tray slide motor driver (IC801)

64 LOAD-IN O

Motor drive signal output to the disc tray slide motor driver (IC801)

65 ST-CLK O

PLL serial data transfer clock signal output to the FM/AM tuner unit

66 ST-DIN I

PLL serial data input from the FM/AM tuner unit

67 ST-DOUT O

PLL serial data output to the FM/AM tuner unit

68 ST-CE O

PLL chip enable signal output to the FM/AM tuner unit

69 TUNED I

Tuning detection signal input from the FM/AM tuner unit “L”: TUNED

70 STEREO I

FM stereo detection signal input from the FM/AM tuner unit “L”: STEREO

71 VSS —

Ground terminal

72 ST-MUTE O

Tuner mute control signal output to the FM/AM tuner unit “L”: mute on

73 SENS2 I

Internal status (SENSE) signal input terminal Not used (fixed at “L”)

74 SENS I

Internal status (SENSE) signal input terminal Not used (fixed at “L”)

75 DISC-SENS I

Disc status detection signal input from the disc sensor (IC703)

76 T-SENS I

Disc tray status detection signal input from the disc tray sensor (IC702)

77 UPSW I

Up switch input terminal Not used (open)

78 ENC3 I
79 ENC2 I

Detection signal input from the disc tray address detect rotary encoder (S811)

80 ENC1 I

81 OUT-OPEN I

82 CAP-H/N O

83 A-TRG O

Motor drive signal output to the trigger motor driver (IC1502)

84 B-TRG O

Motor drive signal output to the trigger motor driver (IC1502)

85 TRG-LOW O

Motor control signal output to the trigger motor driver (IC1502)

7

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INPUT-

CHANGE

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0

Serial data transfer clock signal output to the electrical volume (IC201), DJ effect controller
(IC401), and key control (IC1401)

Communication data bus with the fluorescent indicator tube driver (IC601) and IIC interface
controller (IC901)

Communication data reading clock signal input or transfer clock signal output with the
fluorescent indicator tube driver (IC601) and IIC interface controller (IC901)

7

3

Q

Q

Detection signal input from the disc tray open/close detect switch (S801)
“L”: open, “H”: close

High/normal speed selection signal output of the capstan motor (M1)
“L”: high speed, “H”: normal speed

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