JVC UX-P30 Service Manual

MB049200311

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-P30

CD-R/RW PLAYBACK

SLEEP

DISPLAY

REPEATRANDOMPROG

AUTO

SOUND

FM MODE

PRESET

MODE

CD

CD

CANCEL MULTI KEY SET

PTY

DISPLAY

/EON

MODE

AHB

VOLUME

RM-SUXP3R REMOTE CONTROL

MICRO COMPONENT SYSTEM UX-P30

STANDBY/ON

AUX

FM/AM

TAPE

STANDBY

CD

TAPE

FM/AM

/

CLOCK TIMER

PHONES

AUX

SOUND

AHB PRO

U

L

M

O

E

V

+

Ð

REV.MODE

REC

SP-UXP30 SP-UXP30

CA-UXP30

Area Suffix

B --------------------------- U.K.
E ------- Continental Europe
EN --------- Northern Europe

TABLE OF CONTENTS

1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.MB049

2003/11

SPECIFICATION

Amplifier Output Power 44 W (22 W + 22 W) at 4 Ω (MAX.)

40 W (20 W + 20 W) at 4 Ω (10 % THD)
Audio input sensitivity/Impedance (at 1 kHz) AUX : 400 mV/48 kΩ
Speakers/Impedance 4 Ω - 16 Ω

Tuner FM tuning range 87.50 MHz - 108.00 MHz

AM (MW) tuning range 522 kHz - 1 629 kHz

CD player Dynamic range 85 dB

Signal-to-noise ratio 90 dB
Wow and flutter Immeasurable

Cassette deck Frequency response Normal (type I) : 50 Hz - 14 000 Hz

Wow and flutter 0.15 % (WRMS)

Speaker Speaker units Woofer : 8 cm cone × 1

Tweeter : 2 cm cone × 1
Impedance 4 Ω
Dimensions (approx.) 160 mm × 256 mm × 197 mm (W/H/D)
Mass (approx.) 2.1 kg each

General Power requirement AC 230 V, 50 Hz

Power consumption 50 W (at operation)

3.8 W (on standby)
Dimensions (approx.) 505 mm × 256 mm × 294 mm (W/H/D)
Mass (approx.) 8.5 kg

Design and specifications are subject to change without notice.

1-2 (No.MB049)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of th is product contains special hardw are and

many circuits and components specially for safety purpos­es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per­formed by qualified personnel only.

(2) Alterations of the design or circuitry of the product should

not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteris­tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us­ing replacement components rated for higher voltage, watt­age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser­vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac­teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.

(4) The leads in the products are routed and dressed with ties,

clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem­bling.

(5) Leakage shock hazard testing

After reassembling the product, always perform an isola­tion check on the exposed metal parts of the product (an­tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.

• Plug the AC line cord directly into the AC ou tlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular­ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur­rent must not exceed 0.5mA AC (r.m.s.).

• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ω per volt or more sensitivity
in the following manner. Connect a 1,500Ω 10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex­posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC

voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).

AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)

0.15 F AC TYPE

Place this
probe on

Good earth ground

1.2 Warning

(1) This equipment has been designed and manufactured to

meet international safety standards.

(2) It is the legal resp onsibility of the repairer to ensure that

these safety standards are maintained.

(3) Repairs must be made in accordance with the relevant

safety standards.

(4) It is essential that safety critical compone nts are replaced

by approved parts.

(5) If mains voltage selector is provided, check setting for local

voltage.

1.3 Caution Burrs formed during molding may be left over on some parts

of the chassis.
Therefore, pay attention to such burrs in the case of pre­forming repair of this system.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)

each exposed
metal part.

(No.MB049)1-3

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace­ment parts must be identical to those used in the original circuits.

(2) Any unauthorised design alterations or additions will void the manufacturer's guara ntee; furthermore the manu facturer cannot

accept responsibility for personal injury or property damage resulting therefrom.

(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never

be replaced by parts other than those listed in the man ual. Please note however that many el ectrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and may create shock, fire, or other hazards.

(4) The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts,

high temperature parts, moving parts and/or sharp edges for the prevention of electric sh ock and fire ha zard. When se rvice is
required, the original lead routing and dress should be observed, and it should be confi rmed that they have been returned to
normal, after re-assembling.

1.5.1 Warning

(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.

1-4 (No.MB049)

1.6 Preventing static electricity

C

rt

1

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.6.1 Grounding to p revent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conducti ve sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption)
Anti-static wrist strap

1M

Conductive material
(conductive sheet) or iron palate

(3) Handling the optical pickup

• In order to maintain quality during tran sport and before installatio n, both sides of the laser diod e on the replacement o ptical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.

1.7 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the

replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long

a time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.8 Attention when traverse unit is decomposed *Please refer to "Disassembly method" in the text for the CD pickup unit.

• Apply solder to the short land sections before the flexible wire is disconnecte d from the connecto r CN101 on the CD servo board.
(If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.

D SERVO board

CN601

CD SERVO board

R708

B618

D831

1

B601

R691

R701

R705

B617

CN606

LM­CLSW
GND
OPSW
LM+

M.GND
SW10
SW10
CLOSE
OPEN
OPSW
CLSE
CD+B

CN652

CD+B
CDL
A.GND
A.GND
CDR

MUTE
FLAG
SCD

B602

SCD
CDDG
CDDG
BLKCK
/REST
MLD
MDATA
MCLK
CDDG
SUBQ
SQCK
/RST

1

STAT

W605
31

IC802

C832

51

C833

R831

C831

13

L831

C658

116

C657

C672
C671

CN651

C670

B612

R805

R806

C824

Q801

BE

R654

R821

12

13

C801

C811

R813

R801

R802

C823

C816

R636

C814

B607

B606

B605

X651

R692

C677

R666

C673

C656

R695

R696

R665

C651

61

1

C655

21

R653

C654

R651

R652

R655

R656

R658

C653

R601

R602

B611

R657

R659

C813

R807

R808

R809

R822

R824

R823

C812

1

IC801

C821

24

C802

R803

R804

R812

B608

C815

115

CN601

F-T-T+F+GNDVRLDMDT2KF1NCT1SRF2

C652

R667

R681

41

C676

R682

C822

R710

R706

C691

R703

R670

C669

C679

D601

C665

R669

R664

C667

C668

C680

B614

R684

C681

R685

R663

C664

C663

R662

R648

C615

C616

R607

B613

C612

C614

C610

C617

R683

C607

C643

C641

C642

R642

IC601

171632

B619

R620

R603

R604

C605

C606

R641

R643

R619

B610

C601

B609

B603

C695

C699

R709

C693

IC652

B604

C696

C694

R707

R702

R704

C692

R668

R661

C661

A.GND

ARF

B615

C621

R617

C613

C620

C622

R647

R612

R613

C611

C619

C631

1

C624

C623

BE

B616

C632

Q631

C

D602

R632

R631

R634

R635

1

CN801

C633

FM­D.GND
SM+

R605

R606

R610

R611

R621

C602

C603

C604

SM­REST

6

FM+

R618

CN60

T02

Soldering pa

(No.MB049)1-5

1.9 Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laser

radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are de

feated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in

hazardous radiation exposure.

!

Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

REPRODUCTION AND POSITION OF LABEL and PRINT

WARNING LABEL

1-6 (No.MB049)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB049)1-7

SECTION 3

A

A

DISASSEMBLY

3.1 Main body

3.1.1 Removing the metal cover
(See Fig.1 and 2)

(1) Remove the six screws A on the back of the body.
(2) Remove the two screws B on the side of the body.
(3) Pull both sides of the me tal cover outward and lift the re ar

part of the cover.

Metal cover

A

3.1.2 Removing the rear cover
(See Fig.3)

• Prior to performing the fo llowing proce dure, remove the metal

cover.
(1) Remove the two screws C on the back of the body.

A

Metal cover

B

x2

A

Fig.1

Fig.2

1-8 (No.MB049)

C

Rear panel

C

Rear cover

Fig.3

3.1.3 Removing the tuner board

(See Fig.4 and 5)

• Prior to performing the following procedure, remove the metal

cover.
(1) Disconnect the card wire from connector CN1

board.
(2) Remove the screw D on the right side of the body.
(3) Remove the two screws E on the rear panel.

on the tuner

E

D

CN1

Fig.4

Tuner board

Rear panel

Rear cover

Fig.5

(No.MB049)1-9

3.1.4 Removing the CD mechanism assembly
(See Fig.6 to 8)

• Prior to performing the fo llowing proce dure, remove the metal

cover and the rear cover.
(1) Disconnect the card wires from connecto r CN903, CN904

on the main board on the upper side of the body.

(2) Remove the screw D attaching the tuner board and the CD

mechanism on the right side of the body.

(3) Remove the two screws F attaching the rear panel and the

CD mechanism on the back of the body.

(4) Move the rear part of the CD mechanism assembly

upwards to disengage the two joints a and release from the
rear panel. Pull the front panel toward the front and move
the rear part of the CD mechanism assembly upwards.
Then pull out the CD mechanism assembly from the front
panel backward.

REFERENCE:

To remove the CD mechanism assembly efficiently,
disconnect the card wireconnecting the tuner board with the
main board in advance.

Main board

CN904

CN903

Rear panel

Tuner board

Card wires

Front panel assembly

CD mechanism assembly

Front panel assembly

Joint a

CD mechanism assembly

Fig.6

D

Tuner board

Fig.7

F

Joint a

1-10 (No.MB049)

G

Rear panel

G

G

Fig.8

3.1.5 Remove the rear panel

(See Fig.8 to 10)

• Prior to performing the following procedure, remove the metal

cover, rear cover and the CD mechanism assembly.
(1) Remove the five screws G attaching the rear panel.
(2) Disconnect the card wire from CN902

on the main board.

(3) Disengage the lower two jo ints b on each side of the rear

panel using a screwdriver and remove the rear panel
backward (The tuner board and the fan will be also
detached.Remove them as needed).

Rear panel

Joint b

Fig.9

Joint b

Rear panel

Fig.10

(No.MB049)1-11

3.1.6 Removing the main board / heat sink
(See Fig.11 to 13)

• Prior to performing the fo llowing proce dure, remove the metal

cover, the rear cover, the CD mechanism assembly and the
rear panel.
(1) Disconnect the card wire from connector CN900

and CN931 on the main board.
(2) Disconnect the wire from CN906 and CN907 respectively.
(3) Remove the two screws H attaching the main board to the

chassis on the left side ofthe body and disengage the two

joints c.
(4) Remove the two screws J attaching the heat sink to the

main board.

, CN901

Main board

CN931

CN901

CN900

Main board

CN906

CN907

Fig.11

Front panel assembly

1-12 (No.MB049)

HH

Joint c

Fig.12

Main board

Heat sink

J

Fig.13

3.1.7 Removing the power transformer assembly

r

(See Fig.14 and 15)

• Prior to performing the following procedure, remove the metal
cover, the rear cover, the CD mechanism assembly and the
rear panel.
(1) Remove the cord stopper upwards on the back of the body.
(2) Disconnect the power cord from connector J1000

board of the power transformer assembly.

(3) Disconnect the wire from connector FW903

board.

(4) Remove the four screws K attaching the power transformer

assembly.

on the

on the main

J1000

Power transformer

assembly

Main board

CN907

Cord stopper

Power cord

Fig.14

K

J1000

Power transforme
assembly

K

Fig.15

(No.MB049)1-13

3.1.8 Removing the front panel assembly
(See Fig.11, 16 and 17)

• Prior to performing the fo llowing proce dure, remove the metal

cover, the rear cover, the CD mechanism assembly and the
rear panel.
(1) Disconnect the card wire from connector CN900

and CN931 on the main board (Refer to Fig.11).

(2) Disconnect the wire from connector CN906 and FW903 on

the main board (Refer to Fig.11).
(3) Remove the two screws L on each lower side of the body.
(4) Release the lower joints d on each side of the body using

a screwdriver. Pull out thefront panel assembly toward the

front.

, CN901

Front panel assembly

Main board

Joint d

L

Fig.16

Front panel assembly

Joint d

CN931

L

Fig.17

Main board

Power transformer

assembly

1-14 (No.MB049)

3.1.9 Removing the display board / switch board
(See Fig.18 to 20)

• Prior to performing the following proce dure, remove the front

panel assembly.
(1) Pull out the VOLUME knob on the front panel.
(2) Remove the six screws M attaching the switch board.

Then, open the switch board in the direction of arrow, and
remove the operation button.

(3) Remove the ten screws N attaching the Display board and

the two screws P of the LCD holder.

Display board

N

N

Front panel assembly

VOLUME knob

Fig.18

MM

Switch board

N

P

Fig.20

Switch board

Fig.19

(No.MB049)1-15

3.1.10 Removing the cassette mechanism assembly
(See Fig.21 and 22)

• Prior to performing the following procedure, remo ve the front

panel assembly.
(1) Press the EJCT button on the front panel to open the

cassette door.

(2) Remove the four screws R on the back of the front panel.

3.1.11 Removing the headphone board
(See Fig.21)

• Prior to performing the following procedure, remo ve the front

panel assembly.
(1) Remove the screw Q on the back of the front panel.

Display board

Switch board

R

R

Q

R

Cassette mechanism assembly

Headphone board

Fig.21

Front panel assembly

Cassette door

EJCT button

Fig.22

1-16 (No.MB049)

3.2 Cassette mechanism assembly

3.2.1 Removing the Play/Record & Clear head

(See Fig.1~3)

(1) While moving the trigger arm on the right side of the he ad

mount in the direction of the arrow, turn the flywheel R
counterclockwise until the head mount comes ahead and
clicks.

(2) The head turn s counterclockwise as you turn the flywheel

R counterclockwise (See Fig.2 and 3).

(3) Disconnect the flexible wire from connector CN31

head amplifier & mechanism control board.
(4) Remove the spring from the back of the head.
(5) Loosen the azimuth screw for reversing attaching the head.
(6) Remove the head on the front sid e of the hea d mount.

on the

Cassette mechanism assembly

Fig.1

Head

Fly wheelR

Trigger armHead mount

Flexible wire

Fly wheel R

Fig.2

Azimuth screw

Head

for reversing

Spring

CN31

Head amplifer & mecha control board

Fig.3

(No.MB049)1-17

3.2.2 Removing the head amplifier & mechanism con t rol board
(See Fig.4)

(1) Turn over the cassette mech anism assembly and remove

the three screws A attaching the head amplifier & mecha­nism control board.

(2) Disconnect the flexible wire fro m connector CN31

head amplifier & mechanism control board.

(3) Disconnect connector CN32

anism control board from connector CN1
board.REFERENCE: If necessary, unsolder the 4-pin wire
soldered to the main motor.

3.2.3 Removing the main motor
(See Fig.4~7)

(1) Remove the two screws B .
(2) Half raise the motor and remove the capstan belt from the

motor pulley.

ATTENTION:

Be careful to keep the capstan belt from grease. When reas­sembling, refer to Fig.6 and 7 for attaching the capstan belt.

Head amplifier & mecha control board

of the head amplifier & mech-

on the reel pulse

on the

Main motor assembly

Capstan belt

Fig.5

Main motor assembly

CN31

Flexible wire

A

AA

Fig.4

CN32

4pin wire

B

Main motor assembly

Motor pulley

Capstan belt

Fig.6

Main motor assembly

Fly wheel

1-18 (No.MB049)

Capstan belt

Motor pulley

Fig.7

3.2.4 Removing the flywheel

(See Fig.8, 9)

• Prior to performing the following procedure, remove the he ad

amplifier & mechanism control board and the main motor as­sembly.
(1) From the front side of the cassette mechanism, remove the

slit washers attaching the capstan shaft L and R. Pull out
the flywheels backward.

Fly wheel R Fly wheel L

Fig.8

Fly wheel R

Capstan shaft R Capstan shaft L

Slit washer

Fig.9

3.2.5 Removing the reel pulse board and solenoid

(See Fig.10)

• Prior to performing the following procedure, remove the head amplifier & mechanism control board.

(1) Remove the screw C.
(2) Release the tab a, b, c, d and e retaining the reel pulse board.
(3) Release the tab f and g attaching the solenoid on the reel pulse board.
(4) The reel pulse board and the solenoid come off.

Fly wheel L

bc

a

Solenoid

g

f

d

Reel pulse board

C

e

Fig.10

(No.MB049)1-19

3.2.6 Reattaching the Play/ Record & Clear head

r

r

(See Fig.11~13)

(1) Reattaching the head mount assembly.

a) Change front of the direction cover of the head

mount assembly to the left (Turn the head forward).

b) Fit the bosses O', P', Q', U' and V' on the head mount

assembly to the holes P and V, the slots O, U and Q
of the mechanism sub assembly (See Fig.11 to 13).

CAUTION:

To remove the head mount assembly, turn the direction
cover to the left to disengage the gear. If the gear can not
be disengaged easily, push up the boss Q' slightly and
raise the rear side of the head mounts slightly to return

the direction lever to the reversing side.
(2) Tighten the azimuth screw for reversing.
(3) Reattach the spring from the back of the Play/ Record &

Clear head.

(4) Connect the flexible wire to connector CN31

amplifier & mechanism control board.

on the head

U' Q'

Head mount assembly

Head mount assembly

O'

Fig.11

P'

P'

V'

V'

Direction cove

Spring

Flexible wire

V

O

P

Q

Head

Direction cove

U

Fig.12

Azimuth screw for reversing

Head mount

1-20 (No.MB049)

CN31

Fig.13

Head amplifier &

mechanism control board

SECTION 4

ADJUSTMENT

4.1 Measurement Instruments Required for Adjustment

(1) Low frequency oscillator

This oscillator should have a capacity to output 0dBs to

600Ω at an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600Ω
(3) Electronic voltmeter
(4) Distortion meter
(5) Frequency counter
(6) Wow & flutter meter
(7) Test tape

VT703L : Head azimuth

VT712 : Tape speed and running unevenness (3kHz)

VT724 : Reference level (1kHz)
(8) Blank tape

TYPE l : AC-225

TYPE ll : AC-514
(9) Torque gauge : For play and back tension

FWD(TW2111A), REV(TW2121a) and FF/REW(TW2231A)

(10) Test disc: CTS-1000

4.2 Measurement conditons

Power supply voltage : AC230V (50Hz)----B/E/EE/EN

: AC110/127V/230V(50/60Hz)
: UB/UF/US/UX/U

Reference output Speaker : 0.775V/4Ω

Headphone : 0.077V/32Ω

Reference frequency and
input level

Input for confirming recording
and playback characteristics

Measurement output terminal at Speaker J3002
Load resistance 4Ω

4.2.1 Radio Input signal

AM frequency 400Hz
AM modulation 30%
FM frequency 400Hz
FM frequency deviation 22.5kHz

MIX MIC:-54dBs

(UB/UF/US/UX/U)

1kHz, AUX : -8dBs
AUX : -28dBs

4.2.2 Tuner section

B/E/EN version

FM Band cover : 87.5~108MHz
MW Band cover : 522~1,629kHz
LW Band cover : 144~288kHz

EE version

FM Band cover : 65~74MHz, 87.5~108MHz
MW Band cover : 522~1,629kHz
LW Band cover : 144~288kHz

UB/UF/US/UX/U version

FM Band cover : 87.5~108MHz
MW Band cover : 531~1,602kHz, 530~1,710kHz
SW Band cover : SW1 2.3~6.995MHz

: SW2 7~21.85MHz

Voltage applied to tuner +B : DC5.7V

VT : DC 12V
Reference measurement output 26.1mV(0.28V)/3Ω
Input positions AM : Standard loop antenna

FM : TP1 (hot) and TP2 (GND)

4.2.3 Standard measurement position of volume

Function switch to Tape
Beat cut switch to Cut
Super Bass/Active hyper Bass to OFF
Bass Treble to Center
Adjustment of main volume to reference output VOL : 28V

Precautions for measurement

(1) Apply 30pF and 33kΩ to the IF sweeper output side and

0.082µ F and 100kΩ in series to the sweeper input side.

(2) The IF sweeper output level should be made as low as

possible within the adjustable range.

(3) Since the IF sweeper is a fixe d device, there is no need

to adjust this sweeper.

(4) Since a ceramic oscillator is used, ther e is no need to

perform any MIX adjustment.

(5) Since a fixed coil is used, there i s no need to adjust the

FM tracking.

(6) The input and output earth systems are separated. In

case of simultaneously measuring the voltage in both of
the input and output systems with an electronic voltmeter
for two channels, therefore, the earth should be connect­ed particularly carefully.

(7) In the case of BTL connection amp., the minus terminal

of speaker is not for earthing. Therefore, be sure not to
connect any other earth terminal to this terminal. This
system is of an BTL system.

(8) For connecting a dummy resisto r when measuring the

output, use the wire with a greater code size.

(9) Whenever any mixed tape is used, use the band pass fil-

ter (DV-12).

(No.MB049)1-21

4.3 Cassette mechanism adjustment

Head azinuth
adjustment screw
(Forward side)

Mecha control board

MOTOR SPEED

VR37

BIAS ADJ

VR31

Head azinuth
adjustment screw
(Reverse side)

RECRAGRECL

SW8V

VR37

C308

R313

R315

R314

C310

C313

B155

R327

C221

Q302

C319

C314

C317

C121

B112

L303

C316

L301

VR31

Head azinuth
adjustment screw
(Forward side)

Head azinuth
adjustment screw
(Reverse side)

CN31

R/P head, Erase head

B102

B101

NC

9

C201

B109B108

C209

CN33

R342

C213
R210
R209

C207

B159

16

R341

C208

R207

B200

1

B110

CN31

1

R205

R208

B160

R340

R105
C105

R343

C305

C206

R345

R201
1IC31

MB

PBRAGPBL

MS

MG

1

CN34

B198

R353

Q305

R310

R335

C106

Q103

R305

C307

R303

R122

C103

B163

Q321

Q101

R221

10

B156

C303

R115

B157

R108

R101

C113
R110
R109

R102

C110

C104

R301

R121

1

C108

C107

9

B151

R112

R111

C102

R107

B152

C302

R103
1

C301

C111

B164

C306

R304

C109

B158

8

B106

C101

6

B166

R116

R212
R211
C211

R216

9

IC32

TAP

C304

B113

C202

C210

Q331

RRE

C375

C205

R215

C203

B161

R339
C334

R106

R206

5VMGSOL

R204

R203

B153

R104

R222

C204

B168

PHO

R202

C333

R375

Q201

C332

PLA

Q203

C331

FRE

Q372

R331

B167

R371

10

CN32

B162

R372
R373

C371

Q375

R376

C374

R338

C376

B

E

D375

Q376

B

Q371

E

R337

R336

9

IC33

8

70u

16

1

1-22 (No.MB049)

4.3.1 Mechanism section

Item Condition Measurement method Ref. value

Head azimuth Test tape

:VT703L (8kHz)
Output terminal
:Speaker out

Tape speed Test tap

:VT712 (3kHz)
Output terminal
:Speaker out or Headphone out

Item Condition Measurement method Ref. value

Tape speed
diviation at FWD/
REV

Wow & Flutter Test tape

Test tape
: VT712 (3kHz)
Output terminal
:Speaker out or Headphone out

: VT712 (3kHz)
Output terminal
:Speaker out or Headphone out

(1) Playback the test tape VT703L (8kHz).
(2) Adjust to maximu m output level by azi-

muth adjustment screw for forward side
and reverse side.

(3) This adjustment is adjust by adjustment

screw of forward side and adjustment
screw of reverse side.

Playback the test tape VT712 (3kHz) at end of
forward side,adjust to 2,940~3,90Hz indication
of frequency counter by VR37.

Playback the test tape VT712 (3kHz) at end of
forward and reverse, tape speed deviation
should be less than 6.0Hz.

Playback the test tape VT712 (3kHz) at start of
forward and reverse, Wow & Flutter are should
be less than 0.25%(WRMS).

Adjustment

position

Maximum output Only adjust

at changed
head

2,940 ~ 3,090Hz VR37

Adjustment

position

Leass than

6.0Hz

Less than 0.25%

(WRMS)

VR31

(No.MB049)1-23

4.3.2 Electrical adjustment

Item Condition Measurement method Ref. value

Recording BIAS
adjustment

R/P playback
frequency
response

4.3.3 Electrical response confirmation

Item Condition Measurement method Ref. value

Recording bias
current

Erase current (ref­erence value)

• Forward or Reverse

• Test tape
: AC-514 TYPE ll
: AC-225 TYPE l

• Output termina
Recording head

• Reference frequency
: 1kHz / 10kHz
(Reference: -20dB)

• Test tape
: AC-514 TYPE ll

• Input terminal
: OSC IN

• Forward or Reverse

• Test tape
: TYPE ll (AC-514)

• Measurement terminal
: BIAS test point on printed
circuit board

• Forward or Reverse

• Rec condition
Test tape
: AC-514 TYPE ll
: AC-225 TYPE l

• Measurement terminal
Both side of Erase head

(1) Set the test tape(AC-514 TYPE ll and

AC-225 TYPE l), then make REC/
PAUSE condition.

(2) Connect 100Ω to recording head by se-

ries, then connect to VTVM for measure­ment the current.

(3) After setting, start the recording by re-

lease the PAUSE, in this time bias cur­rent adjust to next fig. by VR31
and VR32

4.0 µA (TYPE ll) and 4.20 µA (TYPE l).

(1) Set the test tape (AC-514 TYPE ), then

make REC/PAUSE condition.

(2) Release the PAUSE, then start recording

the 1kHz and 10kHz of reference fre­quency from oscillator.

(3) Playback the recorded position, 1kHz

and 10kHz output deviation should -1dB
2dB to readjust by VR31

VR32 for Rch.

(1) Change BIAS1 and 2, confirm the fre-

quency should be change.

(2) Set the test tape (AC-514 TYPE ll), then

make REC/PAUSE condition.

(3) Confirm the frequency should 100Hz ±

6kHz at BIAS test point on printed circuit
board.

(1) Set the test tape (AC-514 TYPE ll and

AC-225 TYPE l), then make REC/
PAUSE condition.

(2) Release the PAUSE to REC condition,

connect 1W to ERASE head by series,
then confirm the erase current at both
side of erase head.

for Rch.

for Lch

for Lch and

AC-225
: 4.20µA
AC-514
: 4.0µA

Output deviation
1kHz/10kHz
: -1dB ± 2dB

100 kHz ± 6 kHz

TYPE ll
: 120 mA
TYPE l
: 75 mA

Adjustment

position

VR31

VR31

Adjustment

position

1-24 (No.MB049)

TROUBLESHOOTING

5.1 Flow of functional operation untill TOC read (CD)

Power ON

Power Key

SECTION 5

Slider turns REST
SW ON.

Automatic tuning
of TE offset

Check Point

Check that the voltage at the pin 5

of CN801 is 0V?

VREF

Tracking error waveform at TOC reading

pin 20 of
IC601(TE)

Approx

1.7V

Tracking
servo

Disc start
to rotate

off

Automatic measurement
of TE amplitude and
automatic tuning of
TE balance

Approx.1sec

Tracking
servo ON

Disc to be
braked to stop

TOC reading
finishes

500mv/div
2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of
Focus offset

Automatic measurement of
Focus S-curve amplitude

Disc is rotated

Focus servo ON
(Tracking servo ON)

Automatic measurement of
Tracking error amplitude

Automatic tuning of
Tracking error balance

Check that the voltage at the

pin2 of IC601 is 4.4V?

Confirm that the Focus error
S-cuve, ie at the pin23 of
IC601 is approx.2Vp-p

Confirm that the siganl from
pin 5,6 of IC801 is a 2V
accelerated pulse with approx.
700ms.

Confirm the waveform of
the Tracking error signal
at the pin20 of IC601
(See fig-1)

Automatic tuning of
Focus error balance

Automatic tuning of
Focus error gain

Automatic tuning of
Tracking error gain

TOC reading

Play a disc

Confirm the eye-pattern
at the lead of TP1

(No.MB049)1-25

5.2 Maintenance of laser pickup (CD)

(1) Cleaning the pick up lens

Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.

(2) Life of the laser diode

When the life of the laser diode has expired, the following
symptoms will appear.

• The level of RF output (EFM output : ampli tude of eye
pattern) will below.

5.3 Replacement of laser pickup (CD)

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

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

Is the level of

RFOUT under

1.1V 0.15Vp-p?

NO

Replace it.

YES

O.K

(3) Semi-fixed resistor on the APC PC board

The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power. Since this adjustment should be performed to
match the characteristics of the whole optical block, do not
touch the semi-fixed resistor.
If the laser power is lower than the specified value, the la­ser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is
functioning normally, the laser pickup may be damaged
due to excessive current.

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

Play a disc.

Check the eye-pattern at TP1.

Finish.

1-26 (No.MB049)

(No.MB049)1-27

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB049)

Printed in Japan

WPC