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  9. JVC PC-V55 B User manual

JVC PC-V55 B User manual

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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)