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JVC RC-250L User manual

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MODEL
RC-250L/LB
FM-MW-LW
3-BAND
RADIO
CASSETTE
RECORDER
No.
1409
April
1980
RC-250L/LB
Contents
Page
Specifications:
..
5.22
oes
Secon
Pavel
en
Pe
ee
Ie
gs
lee
aal
Seer
ead
eal
bah
a
ON
el
ae
ae
DRE
ee
ee
2
Main:-Patts
Gocation:
<3
oe¢ecetecterstetien
gece
et
lenses
le
8s
ee
eee
STELE
whe
veh
wie
ee
Carte
Se
BGG
eg
a,
as
oh
el
aun
aed
Geet
a
ea
letiod
3
Disassembly.
&:
Replacement:
«s,s
<capane
acs.
or
po
dea
iec
nae
G1
S
Vie eae
g
Srl
Bae
a
woe
Se
4
Be
sie
SN,
Selene
hare
4
Juner
Alignment:
2.92240
Seed
oe
Oe
ee
ee
Se
eae
AE
ted
otha
a
eens
Wk
ane
nae
FAO
5,6
Adjustment
of
Cassette
Mechanism
........
2...
0
ce
ee
ee
ee
ee
eee
ee
6,7
Block:
Diagrams...
ccs
iets
oA
Eek
OSB
eB
ie
ee Se
a
ee
ee
Ba
dad
dk
eae
Reece
ha
Ie
eae
8
Wiring:
COnMeCCtION
se:
c.6
200
eens
eed
Socata
ae
Ba
iene
we
ne
Sk
es
beg
eee
ig
WS
gig
daa
as
hs
ow
Gd
BI
gestae
AAS
4 A
9
Schematic
Diagram
of
RC-250L/LB
«1.1...
ee
ee
ee
eee
eee
eee
ee
10
Switch
Circuit
Board
Ass’y
..
0.02.
ee
ee
ee
ee
eee
ee
eee
11
Main:Circuit:
Board!
Ass’
y*
cee
ch
bose
ee
arte
ecdnatie
eee
8
Sow
Sans
Pe
eer
ASE
anal
dete
ana
Bach
Sud
aa
a
12,
13
Exploded
View
of
Cassette
Mechanism
..
0...
0.0
ee
eee
eee
eens
14
List-of
Cassette:
Mechanism.
...i.o055
6-ihe
a
eee
ee
ea
aR
Se
eee
EEE
DAY
EM
Se
ee
ee
bem
ee
15
Exploded
View
of
Main
Circuit
Board
Ass’y
........0.
00.
cece
ee
ee
ee
ee
ee
ee
ne
eee
ne
eee
16
Exploded
View
of
Rear
Cabinet
...
20...
2...
eee
ee
eee
eee
eens
16
Exploded
View
of
Front
Cabinet
(1)
2.0.0...
eee
ee
ee
eee eee nee
eens
17
Exploded
View
of
Front
Cabinet
(2)
2.0.0...
ccc
ee
ened
teen
eee
nen
neee
18,19
Final
Packing
Ass’y
(RC-250L)
..
2...
0.
ee
ee
ee
eet
eee
eee
teen
en
yennes
20
Accessories:(RO:2500)
w36
o654
oy
aah
at
eset
bees
PA
oa
ate
Siete
base
Paden
Ste
ag
ale
ee
oe
20
Final
Packing
Ass’y
(RC-250LB)
....
2.0.0...
0c
cece
ee
eee
eee
ee
ee
eee
eee nnn
eennnees
21
Accessories
(RC-250LB)
2...
cc
ee
eee
nate
eee
nn
en
eee
eta
e
ener
enennnne
21
Specification
DIMENSIONS:
29.8
cm(W)
x
18
cm(H)
x
8.2
cm(D)
WEIGHT:
Approx.
2.2
kg/4.8
lbs
(with
batteries)
11-3/4""
(W)
x
7-1/8"
(H)
x
3-1/4”
(D)
1.9
kg/4.2
Ibs
(without
batteries)
TUNER
SECTION
AMPLIFIER
SECTION
:
Frequency
Ranges
>
FM
88
~
108
MHz
Speakers
>
9cem
(3%),
3.2
2
MW
540
~
1600
kHz
Power
Output
:
Max.
1.3
W
We
a0!
S00
Sz
POWER
SOURCE
Antennas
PEBIBOO
aneepia
DC
:6
V,4
R20-cells
or
equivalent
MW/LW;
Ferrite
core
antenna
AC
:
240/220/110
V,
50/60
Hz
RECORDER
Sel
POWER
CONSUMPTION
:
4
W
Tape
Speed
:
4.8
cm/s
(1-7/8
ips)
Track
System
:
2-track
monaural
Recording
System
:
DC
bias
Erasing
System
:
DC
erasing
Fast
Forward
Time
:
Within
110
sec
(C-60
cassette)
Rewind
Time
:
Within
110
sec
(C-60
cassette)
Wow
&
Flutter
:
0.15%
(WRMS)
No.
1499
RC-250L/LB
Main
Parts
Location
Fig.
2
Ref.
No.
fi
Parts
No.
ai
Parts
Name
ale
Description
O’ty
4
—
4
1
*VXL4100-001
Knob
TONE
1
2
*VXL4100-001
is
VOLUME
1
3
*VXL4098-00B
Knob
Ass'y
Tuning
1
4
*VJT3048-00A
Cassette
Door
Ass’y
1
ee
5
VQB012B-304
|
Bar
Antenna
Ass’y
|
L5,6
1
6
Circuit
Board
Ass’y
‘l
Cassette
Mechanism
Ass‘y
8
A\*VTP41N2-60C
Power
Transformer
for
RC-250L
1
or
VTP41N2-60CBS
ied
for
RC-250LB
1
9
/\*QSS2325-109
Slide
Switch
S5-1,-2
for
RC-250L
1
or
QSS2325-109BS
5
for
RC-250LB
1
Note:
1.
Asterisked
parts
(*)
show
“NEW
PARTS”.
Other
parts
are
all
“CURRENT
PARTS”;
therefore,
check
your
inventory
and
order
situation
before
placing
new
order
to
avoid
making
extra
stock.
2.
The
circuit
board
assemblies
and
whole
assembly
of
cassette
mechanism
in
this
model
will
not
be
available
as
spare
parts.
3.
The
parts
marked
/\
are
the
important
parts
for
safety
assurance.
Use
the
specified
part,
when
replacing
the
safety
assurance
part,
never
use
an
eguivalant
one.
No.
1409
RC-250L/LB
Disassembly
&
Replacement
Rear
Cabinet
(Refer
to
Fig.
3.)
Cassette
Mechanism
Assembly
(Refer
to
Fig.
5.)
1.
Remove
4
screws
(1)
~(4):
SBSF30402Z.
1.
Remove
4
screws
(11)~
(14):
SBSF3010C.
2.
Disconnect
the
connecting
wire
from
the
rod
antenna
2.
By
pressing
the
STOP/EJECT
button
open
the
cassette
terminal
(white).
door
to
disengage
the
mechanism.
Fig.
3
(13)
(14)
Circuit
Board
(Refer
to
Fig.
4.)
1.
Take
off
the
TONE
and
VOLUME
knobs.
2.
Remove
5
screws
(5):
VKZ4131-002
and
(6)
~
(9):
SBSF-
3010C,
3.
Loosen
the
screw
(10):
SBSF30102.
Fig.
4
No.
1409
'
RC-250L/LB
Tuner
Alignment
Output
Measuring:
Speaker
terminal
(Impedance
=
3.202),
output
level
50
mW
(0.4
V/3.2
92)
AM
IF
&
RF
Alignment
Input
(SSG):
Modulation
400
Hz,
Modulated
to
30%
r
Input
Signal
|
Step
ore
Place
to
be
aligned
Set
the
V.
Capacitor
to
an
Frequency
455 kHz
Repeat
the
Step
1,
and
adjust
for
no
further
improvement.
=
|
145
kHz
L8
Maximum
r
Loop
Antenna
360
kHz
TC5
|
Minimum
Repeat
the
Steps
3
&
4.
LW
160
kHz
|
350
kHz
Repeat
the
Steps
6
&
7,
and
adjust
for
no
further
improvement.
520kHz
|
L7
Maximum
Loop
Antenna
LL
1650
kHz
TC6
hire
Minimum
Given
to
Loop
Antenna
T2,4,7
Minimum
MW
(IF)
r
L5
160
kHz
Signal
Loop
Antenna
|
TC4
350
kHz
Signal
Fle
E
lL
11
sa
Repeat
the
Steps
9
&
10.
12
600
kHz
L6
600
kHz
Signal
t————
Loop
Antenna
13
1400
kHz
TC3
1400
kHz
Signal
14
Repeat
the
Steps
12
&
13,
and
adjust
for
no
further
improvement.
FM
IF
&
Discriminator
Alignment
1.
Connect
the
sweep
generator
to
the
test
point
TP-2
(Refer
to
Fig.
7).
2.
Connect
the
oscilloscope
to
the
test
point
TP-5
(Hot)
&
TP-7
(Earth)
(Refer
to
Fig.
7).
3.
Align
the
T6
so
that
the
wave
mode
will
be
appeared
on
either
side
of
the
flyback
tine
(Refer
to
Figs.
6-A
&
B).
4.
Align
the
T1,
3
&
5
so
that
the
maximum
sensitivity
and
symmetrical
wave
mode
will
be
obtained
setting
the
marker
10.7
MHz
on
the
peak
(Refer
to
Fig.
6-B).
5.
Align
the
TS
&
6
so
that
the
symmetrical
‘’S’’
curve
will
be
obtained
setting
the
marker
10.7
MHz
on
the
center
of
the
“S"
curve
(Refer
to
Fig.
6-C).
Fig.
6-A
Fig.
6-B
Fig.
6-C
No.
1409
RC-250L/LB
FM
RF
Alignment
Input
(SSG):
Use
75
9
terminal,
modulation
400
Hz,
modulated
to
22.5
kHz
deviation.
ae
Input
Signal
Step
Frequency
Place
to
be
aligned
Set
the
V.
Capacitor
to
Band
Frequency
Given
to
—
=
|
1
87.5
MHz
Rod
Antenna
LL
L3
_
Maximum
2
109
MHz
Terminal
TC-2
Minimum
p=
|
a
_
3
au
Repeat
the
Steps
1
&
2.
4
90
MHz
Ie
een
eine
1
[
90
MHz
Signal
5
106
MHz
Terminal
TC-1
106
MHz
Signal
6
Repeat
the
Steps
4
&
5,
and
adjust
for
no
further
improvement.
Parts
Arrangement
for
Alignment
TP
uty
be
creas
[7
a
TP2@-|1c2__
On
tea_}
=
C2
|
Tl
3
TC5
TC6
T3ypgIP5
|
1P7
$
TS
t7L]LIT6
Fig.
7
Adjustment
of
Cassette
Mechanism
Playback
Torque
1.
The
playback
torque should
be
within
45
to
70
g-cm.
2.
If
the
torque
is
less
than
45
g-cm,
set
the
two-flat
clutch
spring
plate
of
the
take-up
reel
disk
to
the
4
position.
If
the
torque
exceeds
70
g-cm,
set
the
spring
plate
to
the
2
position.
Note:
Before
adjusting
the
torque
wipe
off
the
surface
of
rubber
parts
and
rotating
parts,
if
the
torque
is
not
sufficient.
No.
1409
Fast
Forward
&
Rewind
Torque
1.
Fast
Forward
Torque
In
the
fast
forward
mode,
check
that
the
F.F.
torque
is
within
60
to
130
g-cm
by
applying
the
torque
gauge
to
the
take-up
reel.
2.
Rewind
Torque
In
the
rewind
mode,
check
that
the
rewind
torque
is
within
60
to
130
g-cm
by
applying
the
torque
gauge
to
the
supply
reel.
Thrust
of
Flywheel
The
clearance
between
the
top
of
flywheel
spindle
and
the
flywheel
bracket
should
be
within
0.1
to
0.3
mm.
If
the
clearance
is
out
of
limits,
adjust
the
adjusting
screw
for
normal
value.
Note:
After
adjustment,
fix
the
screw
with
lock
adhesive.
Adjusting
Screw
0.1
~0.3
mm
Fig.
9
Location
of
Heads
The
play/record
and
erase
heads
should
be
positioned
as
shown
below
in
the
playback
mode.
Rec/Play
Head
Erase
Head
Guide
Pin
Fig.
10
RC-250L/LB
Pressure
of
Pinch
Roller
1.
Setting
the
mechanism
vertically
in
the
playback
mode,
the
pinch
roller
should
stop
turning
at
the
pressure
of
380~450
g
when
the
pinch
rcller
arm
has
been
pulled
upwards
by
tension
gauge
as
shown
in
Fig.
11.
2.
If
the
pressure
is
out
of
limit,
change
the
pinch
roller
spring.
Note:
If
the
pressure
is
excessively
high,
it
may
cause
the
noise
from
the
pinch
roller
bearing
and
defec-
tive
in
wow
and
flutter.
If
the
pressure
is
defective-
ly
low,
it
may
cause
defective
in
auto
stop
motion
and
in
wow
and
flutter.
Tension
Gauge
Pinch
Roller
Arm
Capstan
Pinch
Roller
Fig.
11
TAPE
SPEED
1.
The
tape
speed
should
be
within
2940
Hz
(—2%)
to
3090
Hz
(+3%)
by
reference
tape.
2.
If
the
speed
is
out
of
limit,
adjust
it
by
inserting
the
small
screw-driver
into
the
adjusting
hole
of
motor.
a.
If
the
speed
is
less
than
--2%
turn
the
driver
clock-
wise.
b.
If
the
speed
is
over
+3%,
turn
the
driver
counter-
clockwise.
©)
O
Adjusting
Hole
Fig.
12
No.
1409
RC-250L/LB
Block
Diagram
Playback
&
Radio
Reception
Mode
X1
2501342
X2
281342
FM
RF
CONVERTER
X3
2SC460
FM
IF/AM
CONVERTER/
EQUALIZER
DETECTOR
X6
2SC458
EQUALIZER
POWER
AMP
Fig.
13
Recording
Mode
X1-2SC1342
X2.
28C1342
X4
=
28C460
X5
2S5C460
FM
FM
RF
FM/AM
IF
FM/AM
IF
V
CONVERTER
DESCRIMINA-
TOR
D6
pag
INS4A
DETECTOR
6
re
wo
F?
2
X3
2SC460
FM
IF/AM
CONVERTER
/
PRE
AMP
25C458
X6
PRE
AMP
1C-1
BA527
POWER
RECORDING
X7
2SC458
ALC
Fig.
14
No.
1409
RC-250L/LB
Wiring
Connection
ROD
ANT.
MECHA.
ASS'Y
R/P
HEAD
LEAF
SW.
No.
1409
RC-250L/LB
Schematic
Diagram
of
RC-250L/LB
rT”
OY Oe
———
ar
———
are
ezED>
=D
eS
Sa
se
al
ne
ce
a
A
CT
|
=e
eee
Siesta
=m
ER
=
ON
ae
=a
|
cecum
anal
ral
—_——_
ee
el
X1
25C1342(B)
FM
CONY]
x2
2S¢1342(8)
yA
0460(C)
DEANE
7e
C4600)
R20
220K
‘|
|
TP]
FM
RF.
C8),
8P
C9
,,5P
Pe
7
|
TA
1
FM
(ay)
5.0%)
eg
|
DI
HV80
i
C40
0.022u
C29
0.06
C10
1000P
L5_
DISHYB0
TC3
wt
—{—
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NOTES
1{SW.
NO|PARTS
NO.
FUNCTION
POSITION
2
VOLTAGES
ARE
MEASURED
WITH
NO
SIGNAL
USING
Biss
S2
V.TV.M
AT
FM-PLAY.
(
)VALUES
AT
MW-RECORD.
Mw
ol
«PLAYBACK
3
SYMBOL
MARKS
CIRCLED
OF
RESISTORS
ARE
’
PRINTED
CARBON
RESISTORS.
§
ao
-
RECORD
LWo
Play
Rec
TAPE
0
¥
Shaded
parts
show
safety
assurance
parts.
Fig.
16
No.
1409
A40=