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J

PC-V55

sec

VC

SERVICE

MANUAL

PC-V55

B/E/G

Contents

[S]

SE]

Ale)

—

hes

Safety

Precautions

.....

ocation

of

Main

Parts

L

Removal

of

Main

Parts

Enclosure

Section

Mechanism

Section

Main

Adjustment

Wiring

Connection

......

Block

Diagram

Standard

Schematic

Diagram

i

together

with

the

Instruction

Manual.

Page

Page

ert

ee

2

[9]

Location

of

P.C.

Board

Parts

and

Parts

List

ee

a

ee

3

Amplifier

Board...

2.0.0...

Meee

ae

8

bs

sh

bates

16

Volume

Board

2...

00.0003

0054

ae

eee

NG

teat

Couns

ath

a

cena

st

SUE

eae

4

muner

Boards

2

2

vac

she

Se

a

ea

Ya

19

bat

cee

eat

fio]

Exploded

View

of

Enclosure

Assembly

.........

20

de

hes,

gl

ihaine

tac

ahah

te

a

lalacae

bis

be

Oe

Enclosure

Assembly

Parts

List...........

oe

How

to

Engage

Dial

Cord...

2

ee

12

Exploded

View

of

Speaker

Assembly

and

Parts

List

23

ce

ee

ge

Pa

ee

13

fil

Exploded

View

of

Mechanism

Assembly

........

24

WY

gabe

heat

en

eee

gaa

Oyane

ao

eae

nk

one

14

Mechanism

Assembly

Parts

List.

...........

25

ee

eS

14

falePacking

seo

bese

ora

ee

wee

28

fa}

“Accessories.

occ

sec

Sek

el

en

oe

ee

es

29

No.

17414

October

1987

PC-V55

sec

|

['1|

Safety

Precautions

1.

The

design

of

this

product

contains

special

hardware.

Do

not

use

a

line

isolation

transformer

during

this

check.

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.

Repacement

parts

must

be

identical

to

those

used

in

the

original

circuits.

Service

should

be

per-

formed

by

qualified

personnel

only.

.

Alterations

of

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

design

alterations

or

additions

will

void

the

manufacturer’s

warranty

and

will

further

relieve

the

manufacturer

of

responsibility

for

personal

injury

or

pro-

perty

damage

resulting

therefrom.

.

Many

electrical

and

mechanical

parts

in

the

product

have

special

safety-related

characteristics.

These

characteri-

stics

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

hav-

ing

such

features

are

identified

by

(AA)

on

the

schematics

and

parts

list

in

Service

manual.

The

use

of

a

substitute

replacement

which

does

not

have

the

same

safety

characteristics

as

the

recommended

replacement

part

shown

in

the

parts

list

in

Service

manual

may

create

shock,

fire,

or

other

hazards.

.

The

leads

in

the

products

are

routed

and

dressed

with

ties,

clamps,

tubings,

barriers

and/or

the

like

to

be

separated

from

live

parts,

high

temperature

part,

mov-

ing

parts

and/or

sharp

edges

for

the

prevention

of

elec-

tric

shock

and

fire

hazard.

When

service

is

required,

the

original

lead

routing

and

dress

should

be

observed,

and

they

should

be

confirm-

ed

to

be

returned

to

normal,

after

re-assembling.

.

Leakage

current

check

(Safety

for

electrical

shock

hazard)

After

re-assembling

the

product,

always

perform

an

isola-

tion

check

on

the

exposed

metal

parts

of

the

Products

(antenna

terminals,

knobs,

metal

cabinet,

screw

heads,

earphone

jack,

control

shafts,

etc.)

to

be

sure

the

pro-

duct

is

safe

to

operate

without

danger

of

electrical

shock.

2

(No.

1741)

e

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Us-

ing

a

‘‘Leakage

Current

Tester’’,

measure

the

leakage

current

from

each

exposed

metal

part

of

the

cabinet,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

to

a

known

good

earth

ground

(water

pipe,

etc.).

Any

leakage

current

must

not

ex-

ceed

0.5

mA

AC

(r.m.s.).

e

Alternate

check

method.

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Use

an

AC

voltmeter

having

1,000

ohms

per

volt

or

more

sensitivity

in

the

following

manner.

Connect

a

1500

2

10

W

resistor

paralleled

by

a

0.15

nF

AC-type

Capacitor

between

an

exposed

metal

part

and

a

known

good

earth

ground

(water

pipe,

etc.)

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.

Any

voltage

measured

must

not

exceed

0.75

V

AC

(r.m.s.).

This

corresponds

to

0.5

mA

AC

(r.m.s.).

AC

VOLTMETER

(HAVING

1000

Q/V,

OR

MORE

SENSITIVITY)

0.15

pF

AC-TYPE

oT

PLACE

THIS

PROBE

ON

EACH

EXPOSED

METAL

PART

|

|

1500

2

10

W

GOOD

EARTH

GROUND

2.

Location

of

Main

Parts

indicator

Board

Ass’y

Pointer

|

CD

IN

Jack

|

youl

Board

Ass'y

i

Tuner

Board

ASS'y

Mechanism

Ass

y

(No.

1741)

3

PC-V55

sec

|

Removal

of

Main

Parts

@Enclosure

Section

@

Front

cover

assembly

1)

Remove

the

battery

cover.

2)

Remove

the

band

switch

knob.

3)

Remove

five

screws

@)

and

@)

from

the

rear

side.

4)

Remove

a

screw

@

on

the

right

side.

(Left

side

on

figure)

5)

Open

the

cassette

door

and

remove

the

front

cover.

@

Tuner

chassis

assembly

1)

Remove

a

screw

@)

securing

the

tuner

chassis

assembly

together

with

the

mechanism

assembly.

(The

head

wire

grounding

lug

is

also

tightened

together

with

them.

So,

contact

the

jug

with

the

mechanism

chassis

after

remov-

ing

the

screw.)

2)

Disconnect

the

antenna

wire

from

the

tuner

board

assem-

bly.

3)

Disconnect

connectors

CN302

(TUNER

signal)

and

FW302

(SEA

signal)

wired

to

the

main

board.

®

Mechanism

assembly

(See

Fig.

3-2.)

1)

Remove

two

screws

©

securing

the

mechanism

assem-

bly

by

the

left

side.

2)

Disconnect

connectors

CN301

(Head

wire)

and

CN303

(Motor

wire)

which

are

wired

to

the

main

board.

3)

If

necessary,

disengage

wires

to

the

recording

switch

and

the

motor

by

cutting

the

bind.

Battery

Terminal

Board

@

Main

board

assembly

1)

Draw

out

the

battery

terminal

board.

2)

Remove

ascrew

()

securing

the

recording

switch.

3}

Remove

two

screws

@

securing

the

AC

jack

bracket.

4)

Remove

two

screws

@)

securing

the

power

transformer.

5)

Disconnect

the

3D

speaker

cord

from

the

main

board.

6)

If

necessary,

remove

the

3D

switch,

speaker

terminal

and

CD

in

jack

board.

Fig.

3-3

4

(No.

1741)

PC-V55

pec

@

3D

speaker

1)

Remove

a

screw

securing

the

3D

switch.

2)

Remove

seven

screws

49

securing

the

3D

speaker

cover

and

its

base.

3)

Take

off

the

3D

speaker

from

the

base.

@

Cassette

door

1)

Stide

the

cassette

lid

leftwards

and

take

it

off.

2)

Remove

the

door

damper.

3)

Remove

the

shaft

of

the

cassette

holder

arm.

Motor

Switch

@Mechanism

Section

Door

Rock

Direction

Switch

REVERSE

MODE

PLAY

FWD

STOP

DIRECTION

Fig.

3-4

Fig.

3-5

=

How

to

Engage

Indicator

Belt

Fig.

3-6

Disassembly

of

Mechanism

Section

@

Button

lever

assembly

1)

Remove

a

screw

@

securing

the

button

lever

assembly

by

the

top

side.

(By

removing

the

direction

switch

fitting

beforehand,

it

eases

to

do

the

above

proceduré.)

2)

Remove

four

screws

@)

and

@)

securing

the

assembly

by

both

sides

of

the

front

panel.

3)

Remove

a

screw

@)

securing

it

by

the

left

side.

Fig.

3-8

Left

side

view

Fig.

3-9

Front

side

view

(No.

1741)

5

PC-V55.

pec

@

Motor

assembly

1)

If

the

button

lever

assembly

has

not

been

removed,

remove

screws

@),

@)

and

@)

and

then

remove

a

screw

&)

on

the

rear.

2)

When

the

button

lever

assembly

has

been

removed,

remove

screws

@

and

®.

Fig.

3-10

Bottom

view

@

Head

assembly

1)

Disconnect

wiring

of

the

head.

(The

wire

clamp

can

be

taken

off

by

pressing

it

in

the

direction

of

the

arrow

mark

shown

in

the

figure.)(See

Fig.

3-12)

2)

Remove

two

screws

©

securing

the

head

assembly.

3)

Remove

two

adjusting

screws

@.

4)

Slightly

lifting

the

head

assembly

upward,

pull

it

in

the

direction

of

Y

shown

in

the

figure

to

make

the

shaft

®

free

from

engagement.

5)

Remove

the

angle

section

©

of

the

erase

head.

The

portion

®

can

be

removed

by

raising

its

right

side

up-

wards

and

setting

the

head

assembly

upright

at

the

same

‘

How

to

disengage

the

wire

clamp

time.

Ih

ort"

J

Fig.

3-12

Replacement

of

the

head

1.

Draw

the

gear

®)

out

of

the

rotary

head

assembly.

2.

Disengage

the

pawls

©)

of

at

the

both

sides

of

the

head

bearing

plate.

@

Reassembly

1.

Set

the

stud

to

the

H.

slide

plate.

2.

To

assemble

the

H.T.

over

gear

and

the

head

panel

with

the

shaft,

first

set

the

two

points

of

the

H.T.

over

gear

(shown

in

the

figure)

for

points

(@)

and

©

of

the

H.

slide

plate

respectively.

'

3.

The

head

gear

and

H.T.

over

gear

should

be

set

to

gear

Set

the

etud36

into

each

other

in

the

same

condition

as

they

were

done

OE

ae

Bete

before

disassembly

(as

shown

in

the

figures).

7

Head

Ass‘y

Head

stopper

Head

stopper

~~.

Spring

A

tooth

gears

into

hi

ar

wheel.

mee

HT

Over

Gear

H,.T,

over

gear

Fig.

3-15

Fig.

3-14

Gearing

condition

can

be

checked

by

operating

the

direction

switch.

6

(No.

1741)

@

Pinch

roller

The

pinch

roller

can

be

removed

by

disengaging

washers

©

and

©.

—

Disk

unit

assembly

1)

Remove

a

screw

oO)

fixing

the

motor

switch.

2)

Remove

a

screw

cB)

securing

the

disk

base

bracket.

3)

Setting

up

the

disk

base

unit

disengage

the

pawl

of

the

©

,and

then

remove

the

disk

unit

assembly

with

careful

attention

not

to

overstrain

the

gears.

(Removing

the

flywheel

beforehand

eases

the

work

of

this

step.)

@

Flywheel

assembly

Remove

a

washer

()

securing

the

flywheel

assembly.

{At

this

step,

be

careful

not

to

miss

a

flat

washer

set

be-

tow

the

washer

©

.}

@

T.

cam

gear

T

cam

gears

can

be

disengaged

by

removing

the

C-shape

washer

®.

(Pay

attention

to

left

and

right

gears

which

are

different

each

other.)

@

Button

base

assembly

1)

Remove

two

screws

(2

on

the

rear

panel.

2)

Remove

a

screw

\k)

securing

the

pause

button

lever,

and

remove

the

pause

button

lever’s

stud

from

the

lever.

After

the

above

procedure,

press

the

button

lever

to

re-

move

it.

(See

Fig.

3-7.)

3)

Remove

a

screw

@

securing

the

reverse

mode

button

lever

and

remove

a

stud

from

the

button

lever.

Then

press

the

lever

to

remove

it.

(See

Fig.

3-7.)

4)

Disengage

springs

at

seven

points

@,

0.6,0.

9M,

®

and

®

shown

in

the

figure.

5)

Remove

six

screws

@

securing

the

capstan

sleeve.

(See

Fig.

3-7.)

6)

Reverse

the

set

upside

down

(buttons

are

positioned

downward),

and

remove

the

chassis

and

button

base

assembly,

PC-V55

sc

Fig.

3-16

FWD

Gear

REV

Gear

Bottom

Side

Fig.

3-17

(No.

1741)

7

PC-V55

sec

|

[4]

Main

Adjustments

@

Tuner

Section

Basic

conditions:

Power’Source

of

the

Receiver

:

DC

12VorAC120V

Tuner

Section

:

7V

Load

Resistance

of

the

Receiver:

50

mW

(0.55

V)/6

©

Modulation

of

SSG

:

AM

—

400

Hz,

30%

FM

—

400

Hz

22.5

kHz

Dev

TC7

TC8

Dummy

Antenna

Loop

Antenna

I

—O"A”

TP5

i

rer

R

1

R

5

C

AM

S66

oop

Antenna

{

|

Bar

ANT.

!

t

|

|

i]

?

I

60cm

a

FM

:

Ry

+R,

=

80,

c=0

R,:

Output

impedance

of

S.S.G.

Fig.

4-2

@

Tuner

Alignment

BASIC

CONDITIONS

DC

12

V,

AC

110-120/220-240V

50

mW

(0.55

V)/6

0

400

Hz.

30%

POWER

SOURCE

OF

THE

RECEIVER

LOAD

RESISTANCE

OF

THE

RECEIVER

MODULATION

OF

SSG

1.

AM

IF

ALIGNMENT

1-1

Conditions

of

the

receiver.

(1)

Power

source:

Description

DC

7V

(When

the

power

is

supplied

directly

to

the

tuner

in

the

receiver,

the

voltage

should

be

adjusted

to

the

proper

level

which

shall

be

required

by

the

tuner.)

8

(No.

1741)

2.

FM

IF

ALIGNMENT

PC-V55

B/E/G

Description

RADIO

AM

Minimum

gain

position

Center

position

Near

the

minimum

capacity

position

where

no

signal

come

in.

Function

switch

position:

Band

select

switch:

Volume

control:

SEA

control:

Variable

capacitor:

Connection

of

Sweeper

and

the

receiver

Tuner

input:

Tuner

output:

Positive

side

to

TC3

positive

side

Positive

side

to

TP6

Negative

side

to

TP7

]

CFT

Adjust

AM

I.F.T.

(above

mentioned

aligning

position)

so

that

maximum

and

symmetrical

wave

form

can

be

obtained.

In

this

case,

the

wavehead

should

be

appeared

at

the

center

marker

(450

kHz)

on

the

scope

of

Sweeper.

Aligning

position:

Alignment

(Waveform):

2-1

Conditions

of

the

receiver

(1)

Power

source:

Same

as

mentioned

in

item

1-1

(2)

Function

switch

position:

RADIO

(3)

Band

select

switch:

FM

(4)

Volume

control:

Minimum

gain

position

(5)

SEA

control:

Center

position

(6)

Variable

capacitor:

Near

the

minimum

capacity

position

where

no

signal

come

in.

2-2

Connection

of

Sweeper

and

the

receiver

(1)

Tuner

input:

Positive

side

to

TP5

(2)

Tuner

output:

Positive

side

to

TP6

Negative

side

to

TP7

NOTE

a)

Attach

a

capacitor

(30

pF)

and

resistor

(30

kQ)

to

the

positive

side

cable

which

shall

be

led

from

Sweeper

input.

b)

Attach

a

resistor

(100

k®)

in

series

to

the

positive

side

cable

which

shall

be

led

from

Sweeper

output.

2-3.

Checking

FM

IF

waveforms

The

waveform

should

be

symmetrical.

Depending

on

the

C.

Filter

used,

the

intermediate

frequencies

are

as

shown

in

the

table

below.

C.

Filter

color

marking

Frequency

(MHz)

C.

Filter

color

marking

Frequency

(MHz)

Black

10.64

+

0.03

Orange

10.73

+

0.03

Blue

10.67

+

0.03

White

10.76

+

0.03

Red

10.70

+

0.03

3.

AM

RF

ALIGNMENT

3-1

(1)

(2)

(3)

(4)

(5)

3-2

(1)

(2)

(3)

3-3

3-4

Conditions

of

the

receiver.

Power

source:

Same

as

mentioned

in

item

1-1.

Function

switch

position:

RADIO

Volume

control:

50

mW

SEA

control:

Center

position

Variable

capacitor:

Refer

the

following

list

shown

in

item

3-4.

Conditions

of

SSG.

Modulation:

Refer

the

basic

condition

Frequency:

Refer

the

following

list

shown

in

item

3-4.

Output

level

of

the

attenuator

in

SSG:

Approx.

50

mW

Power

output

measuring

position:

Speaker

terminals

Alignment:

(No.

1741)

9

PC-V55

sec

|

Band

Select

|Sort.of

Antenna

to

be

‘ °

ie

Aligning

attached

to

SSG

Frequency

of

SSG

Variable

Capacitor

Position

Position

2

1,650

kHz

Min.

capacity

TC-7

Adjust

the

above

aligning

position

(L7

&

TC-7)

repeatedly

so

that

:

AM

PeopAniaana

the

tuner

can

be

received

above

frequency

range

(band

width).

|

GOOKHz

to

be

received

600

kHz

L2

5

1,400

kHz

to

be

received

1,400

kHz

TC-3

6

Adjust

the

above

aligning

position

(L2

&

TC-3)

repeatedly

so

that

the

tuner

can

be

obtained

the

best

sensitivity.

145

kHz

Max.

capacity

L6

8

360

kHz

Min.

capacity

TC-6

|

9

LW

ioepcAntenne

Adjust

the

above

aligning

position

(L6

&

TC-6)

repeatedly

so

that

the

tuner

can

be

received

above

frequency

range

(band

width).

10

B/E

version

160

kHz

to

be

received

160

kHz

L3

11

350

kHz

to

be

received

350

kHz

TC-2

12

Adjust

the

above

aligning

position

(L4

&

TC-4)

repeatedly

so

that

the

tuner

can

be

obtained

the

best

sensitivity.

13

145

kHz

Max.

capacity

L6

15

LW

Loop

Antenna

Adjust

the

above

aligning

position

(L6

&

TC-6)

repeatedly

so

that

the

tuner

can

be

received

above

frequency

range

(band

width).

16

G

version

160

kHz

to

be

received

160

kHz

L3

17

360

kHz

to

be

received

290

kHz

TC-2

18

Adjust

the

above

aligning

position

(L3

&

TC-2)

repeatedly

so

that

the

tuner

can

be

obtained

the

best

sensitivity.

19

5.8

MHz

Max.

capacity

L8

20

18.6

MHz

Min.

capacity

TC-8

21

SW

Dummy

Adjust

the

above

aligning

position

(L8

&

TC-8)

repeatedly

so

that

Antenna

the

tuner

can

be

received

above

frequency

range

(band

width).

22

6.0

MHz

to

be

received

6.0

MHz

23

18.0

MHz

to

be

received

18.0

MHz

24

Adjust

the

above

aligning

position

(L4

&

TC-4)

repeatedly

so

that

the

tuner

can

be

obtained

the

best

sensitivity.

Item

Description

4.

FM

RF

ALIGNMENT

4-1

Conditions

of

the

receiver.

(1)

Power

source:

Same

as

mentioned

in

item

1-1.

(2)

Function

switch

position:

RADIO

(3)

Band

select

switch:

FM

(4)

Volume

control:

50

mW

(5)

SEA

control:

Center

position

(6)

Variable

capacitor:

Refer

the

following

list

shown

in

item

4-3.

4-2

Condition

of

FM

SSG.

(1)

Modulation:

Refer

the

basic

condition

(2)

Frequency:

Refer

the

following

list

shown

in

item

4-3.

(3)

Output

level

of

the

attenuator

in

FM

SSG:

The

level

shall

be

decided

by

the

load

resistance

of

the

receiver

mentioned

in

the

basic

conditions.

L

10

(No.

1741)