JVC RC-545L User manual

MODEL
RC-545L/LB
FM-SW-MW-LW
4-BAND RADIO
STEREO CASSETTE
RECORDER
No. 1388
February 1979

RC-545L/LB |
Contents
Page
SPECICATION 5.55. iss reich OR ie iw vee ele SSR Ree area tego el wes ulate cay hte hatder WHE dace dlanit Wt bas ibe Gates 2
Main Parts: Locationic: agen ciscs. Sone d Ae far lacs ete Be BG Shad 02 9 ale eds Wig Uden an wane Sl ar at Bi ws Wye SOS Rane owas 3
Disassembly & Replacement ........- 02. ee ee ee ees 4,5
Tier AV geareb erat a seisi 8d aes fos boogaloo oa SRL, ral aing! og las Wane 4 wh el eet, SERN Ai wie ald Arisa wie ae 6,7
Adjust Recording Bias). ic: 55 Gi ee Cee ee ee eae Ee eee 8 Se Ne oe Eee Sa ewe Se 8
Adjusting Head /AZimuth: 326... oe ele Be, ere a Reig cece title eee ele eee io Shee ies dae Le 8
How’ to Fit Dial Cordes 6 iis ib eas 6 eb eos BE Pe eee ew OW Oo aS Oa Re ae ne bee ea Se ee OA 9
Adjustment of Cassette Mechanism. .. 2.2... 0... ce ee eee 10,11
Block: Diagram 2: ix¢.s: pats worse ie es Se Set eats A Se ETS Eee OS Ete Os as ee eg ee 12
Wiring COnmection..-co5c5 she. oe She -dae Betas, Bua hee ia as Aa ee ete, SOR Sag MB aed Lgeee dd -p Oreerer ed ala was 13
Schematic Diagram of RC-545L/LB (Tuner)... 1.0... ce eee teens 14
Schematic Diagram of RC-545L/LB (Amplifier)... 2.0... ee ee eee 15
Tuner: Circuit: Board: Ass 'Voiitec.5. 6 sa cen sie hae Sone ee BASS, Se BALLS Ape eae 2 a oe RA ee eels 18,19
Exploded View of Cassette Mechanism .........0 2... eee ee eee eee eee tenes 20
List of Cassette. Mechanism ii ci ccs ice ek dae wd eee CG ek a wa i See Ae a 21
Connector:Circuit Board) Assy 25. aoa 86 ee Oe eh Se ee ee SER AE OBA EA 22
LED Circuit Boatd Ass’y. i. cea aces cele Sadho ee es MORN eR ERE ow ede ee a seed ee aoe 22
Power Supply Circuit Board Ass’y ...... 0... ee eee ee ee ee ee ee eee eee eee 22
Exploded View of Tuner Chassis Ass’y .. 2... 2. ec ee tee eee eee 23
Exploded View of Amplifier Section... ....0..0 0.0.0.0. cc ee ee ee es 24,25
Exploded View of Front Cabinet .... 0... 2.0... 00 cee ee ee ee ee ee ee 26,27
Exploded View of Rear Cabinet (RC-545L) 0... ce ee eee eee nen e eee 28
Exploded View of Rear Cabinet (RC-545LB) . 1... 0... ce ee ee eee 29
Final Packing Ass’y (RC-545L) 2.0... ee ee eee eee tenes 30
Accessories. (RE-S45 Ey iso: 0s /aa/c wale cine ali f daa de a ae ale, BARS be os ee eS ee OOH Ca aa 30
Final Packing Ass’y (RC-545LB) 2... 0... ce ee ee ee eee ee eee ee ene 31
Accessories (RC-545LB). 0... ee ee ee ee eee ee eee eens 31
Specifications
DIMENSIONS:
9-1/2"
TUNER SECTION
Frequency Ranges
RECORDER SECTION
Tape Speed
Track System
Recording System
Erasing System
S/N Ratio
Fast Forward Time
Rewinding Time
Wow & Flutter
AMPLIFIER SECTION
Speakers
No. 1388
24.1cm(H) x 42.4cm(W) x 11.4cm(D)
x 16-3/4" = x 4-1/2”
FM 88~108MHz
SW 6~18MHz
MW 540~1600kHz
LW 150~350kHz
4.8 cm/s (1-7/8 ips)
4-track 2-channel stereo
AC Bias
DC Erasing
More than 40dB at 1kHz
Within 90 sec. (C-60 cassette)
Within 90 sec. (C-60 cassette)
0.14% (WRMS)
12cm (5) x 2, 3.22
WEIGHT: Approx.
Power Output
Input Jacks
Output Jacks
Input/Output Jack
POWER CONSUMPTION :
SEMICONDUCTORS
ICs
Transistors
Diodes
POWER SOURCE
DC
AC
4.5 kg (with batteries)
9.9 Ibs.
Max. 5.4W (2.7W+2.7W)(DC)
4W (2W+2W)(DC) at 10% THD
MIC x 2 (0.8mV, low imp.)
Ext. Speaker x 2 (3.2~8Q)
Headphones x 1 (80)
DIN
12W (RC-545L)
9.5W (RC-545LB)
5 + 2 (Microphone)
10 + 2 (Motor governor)
14
9V,6 R20”, “U2” cells or
equivalent
110/220/240V, 50/60Hz

Main Parts Location
RC-545L/LB
Fig. 1 Fig. 2
Ref. No. Parts No. Parts Name Description | O’ty
1 *VXL4045-001 Knob VOLUME 1
2 *VXKM520-30012 " BALANCE 1
3 *VXKM520-30012 tf TONE 1
4 VXL4021-001 ut Tuning 1
5 VXKM520-20010 i" FINE TUNING 1
6 *VJN4022-001 Pointer 1
7 *VQB012B-303 Bar Antenn Ass’y L4,5 1
8 a Circuit Board Ass’y Tuner 1
9 . " Amplifier 1
10 * " Connector 1
11 _ Cassette Mechanism Ass‘y 1
12 EAS12P126SH Speaker 12cm(5"’), 3.2Q 2
13 *V/DM5049-004-002 Connector & Wire Ass’y CN1-S 1
14 *\V/DM5049-004-001 " CN304-S 1
15 *V/DM5049-004-004 ” CN303-S 1
16 *VDM5049-004-003 u CN302-S 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.
The circuit board assemblies and whole assembly of cassette mechanism in this model will
not be available as spare parts.
The parts marked \ are the important parts for safety assurance.
Use the specified part, when replacing the safety assurance part, never use an equivalent
one.
No. 1388

RC-545L/LB
Disassembly & Replacement
A. Rear Cabinet
1. Remove the battery cover.
2. Remove 7 screws (1)~(7): SDSB3020R.
3. Disconnect 3 connectors from the rod antenna (white)
and power supply section (red & black).
C.
1
2.
3.
Amplifier Circuit Board
Take off the volume, balance and tone control knobs.
Disconnect 3 connectors (B), (C) & (D).
Remove 5 screws (10)~(13): SPSP3006VS and (14):
SBSB3014C.
Fig. 3
B. Tuner Section
1. Set the tuning dial to the minimum frequency.
2. Take off the tuning and fine tuning knobs.
3. Disconnect the 5-pin connector (A) from the amplifier
section and a connector to the speaker terminal.
4. Remove 2 screws (8) & (9): SBSB3025C.
Note: Engage the pointer on the front cabinet with the
pointer holder on the tuner chassis, as the pointer
separates from the holder by removing the turer
section from the cabinet, when mounting the tuner
section on the cabinet.
For details refer to page 9.
Fig. 4
No. 1388
Fig. 5
D.
Amplifier
Section
(with
Cassette
Mechanism)
BRWN
. Take off the volume, balance and tone control knobs.
. Disconnect 4 connectors (A), (B), (C) & (D).
. Remove 5 screws (14)~(18): SBSB3014C.
Open the cassette case by depressing the STOP/EJECT
button to disengage the internal mechanism.
Fig. 6

RC-545L/LB
E. Cassette Mechanism G. Power Supply Section
1. Remove the amplifier section in accordance with the Remove 2 screws (21) & (22): SBSB3014C.
item D.
2. Remove 4 screws (10)~(13): SPSP3006VS.
3. Desolder wires from the motor, heads and leaf switch on
the cassette mechanism.
Fig. 9
H. Component Parts of Cassette Mechanism
The cassette mechanism of RC-545 is the essentially the
same as of RC-525 and RC-323.
Refer to the service manual of RC-525 or RC-323.
Fig. 7
F. Jack Board
1. Remove the amplifier circuit board as following the
item C.
2. Remove 2 screws (19) & (20): SBSB3010Z.
Fig. 8
No. 1388

RC-545L/LB
Tuner Alignment
Output Measuring:
AM IF & RF Alignment
Speaker terminal (Impedance = 3.2Q), output level 50mW (0.4V/3.2Q )
Input (SSG} Modulation 400Hz, Modulated to 30%
[
Step
Frequency
Input
Signal
Place
to
be
Set
the
V.
Band
Frequency
Given
to
aligned
Capacitor
to
1
MW
Loop
Antenna
T2,3
Minimum
—_
2
(1F)
Repeat
the
Step
1,
and
adjust
for
no
further
improvement.
4 360KH2 panei To6
5 LW Repeat the Steps 3 & 4.
6
L4
160kHz
Signal
8
|
|
Repeat
the
Steps
6
&
7,
and
adjust
for
no
further
improvement.
Q
520kHz
L8
Maximum
16B0KH2 eee TC7
11 Repeat the Steps 9 & 10.
a) MY | eoone yarns
13
14
Repeat
the
Steps
12
&
13,
and
adjust
for
no
further
improvement.
17 or Repeat the Steps 15 & 16.
S.OMAZ | Fod Antenne through
19 Dummy Antenn
ND
ie)
FM IF & Discriminator Alignment
Input (Sweep Generator)
Output (Oscilloscope)
: TP3 (hot)
IF
Discriminator
Repeat the Steps 18 & 19, and adjust for no further improvement.
TP4 (hot) & TP7
TP6 (hot) & TP7
Mode
Place
to
be
aligned
Wave
form
T1,4
Peak
TS
S-curve
Step
1 IF
2 Discriminator
No. 1388

RC-545L/LB
FM RF Alignment
Input
(SSG):
Use
75Q
terminal,
modulation
400Hz
modulated
to
22.5kHz
deviation,
Connect
Hot
side
to
TP1
and
Cold
side
to
TP2.
Step Frequency Input Signal Place to be Set the V.
87.5MHz Maximum
P
109MHs
TP1
&
TP2
TCA
Repeat the Steps 1 & 2.
z TP1 & TP2 L2 90MHz Signal
106MHz 106MHz Signal
Repeat the Steps 4 & 5, and adjust for no further improvement.
FM MPX Alignment Dummy Antenna
A. Regular Method
1.
Connect
a
frequency
counter
to
the
test
point
TPS.
2.
Supply
the
monaural
signal
(98MHz,
60dB)
across
the
test
points
TP1
and
TP2.
3.
Adjust
the
variable
resistor
VR1
so
that
the
frequency
becomes
19kHz
+
100Hz.
B. Simplified Method
. Tune to a FM stereo broadcast.
2.
Set
the
variable
resistor
VR1
to
a
center
position
of
the
range
where
the
stereo
indicator
keeps
lighting.
=
Ri + R2= 800
C = 10pF
R1 : Output impedance of S.S.G.
Fig. 10
Parts Arrangement for Alignment
No. 1388

RC-545L/LB
Adjusting Recording Bias
Bias Frequency Bias Current
1.
Connect
a
frequency
counter
across
TP101.
1.
Connect
a
V.T.V.M.
across
TP101
and
TP201.
2.
Set
the
BEAT
CUT
switch
to
left
position.
2.
Adjust
the
variable
resistor
VR101
(L)
and
VR201
{R)
3.
Adjust
the
oscillator
coil
L301
so
that
the
counter
so
that
the
voltage
becomes
4.5mV
(450uA/109).
indicates 68kHz.
VR201
© © 1O) @
TP101
Fig. 12
Adjusting Head Azimuth
Regular Method
1. Connect a dual channel oscilloscope to the speaker
terminals.
. Set the MODE switch to the STEREO position.
. Playback the test cassette for azimuth adjustment.
4. Adjust the head azimuth so that the output signals of
left and right channels will become maximum and in
WN
phase.
Note: If a single channel oscilloscope will be used, apply
the
left
channel
signal
to
the
X-axis
and
the
right
to
Output
the Y-axis and draw the Lissajous figure.
Simplified Method
1.
Connect
a
V.T.V.M.
across
the
speaker
terminal.
2.
Set
the
MODE
switch
to
MONO.
—m
Angle
3.
Playback
the
test
cassette
for
azimuth
adjustment.
4. Adjust the head angle for maximum output.
Note: The output voltage shows three peaks while
adjusting head angle as illustrated on the right
adjust for maximum peak.
5.
Check
that
the
output
difference
between
MONO
and
STEREO is within 3dB.
No. 1388
Fig. 13
’

RC-545L/LB
How to Fit Dial Cord
A. Fit the dial Cord
1. Dial Cord
Material : Tetoron
Diameter of cord : 0.6mm (24 mil)
Whole length of cord : 775mm (30-1/2’’)
. Turn the dial drum fully clockwise.
. Fit the cord in numerical order as shown in Fig. 14.
. Fix the pointer holder to the cord and adjust the starting
point.
a. Turn the dial drum fully counterclockwise.
b. Set the left edge of needle holder to the projected
marking on the chassis as shown in Fig. 15 and fix the
cord to the holder by lock paint.
PWN
B. Engaging the pointer with the pointer holder
. Set the pointer holder to the minimum frequency by
turning the dial drum fully counterclockwise.
2. Set the pointer assembled on the cabinet to the projection POINTER-~—>
on the cabinet as shown in Fig. 16. HOLDER
3.
Mount
the
tuner
section
on
the
cabinet
and
engage
the
|
pointer with the holder.
=
MARKING
Fig. 15
POINTER
PROJECTION
Fig. 16
Aigew No. 1388

RC-545L/LB
Adjustment
of
Cassette
Mechanism
Play Timing
1. In the playback mode, the clearance (A) between the
pinch roller arm and the stopper of head base should be
within 0.2 to 0.3 mm.
If the clearance is beyond the limits, bend the part (B)
of pinch roller arm to adjust the clearance as shown in
Fig. 17.
Pinch Roller Arm
Stopper
(Head Base)
0.2 ~0.3 mm
Fig. 17
2. Check to see that the take-up idler turns at the same
time as the pinch roller or the take-up idler turns first
and then the pinch roller turns, when the PLAY button
is pressed.
a. If the pinch roller turns very later than the take-up
idler, bend the part (C) of head base which is
contacted with the take-up idler by the part (D) to
the (E) direction as shown in Fig. 18.
b. If the take-up idler turns later than the pinch roller,
bend the part (C) to (F) direction.
Head base
Take-up Idler
Fig. 18
No. 1388
Cue & Review Mechanism
1. Timing of Cue Action
a. In the playback mode, check to see that the take-up
reel disk stops turning after the pinch roller has
stopped turning or stops at the same time and then
the mechanism becomes fast forwarding mode when
the CUE button has been pressed.
b. If the timing is out of order, adjust it as following the
item 2 of ‘Play Timing”.
2. Timing of Review Action
a. In the playback mode, check to see that the take-up
reel disk stops turning after the pinch roller has
stopped or stops at the same time and then the
mechanism becomes rewinding mode, when the
REVIEW button has been pressed.
b.
If
the
timing
is
out
of
order,
adjust
it
as
following
the
item 2 of “Play Timing”.
Pause Timing
In the playback mode, check that the PAUSE button is
locked and the mechanism temporarily becomes stop mode
when the PAUSE button has been pressed, and that the
button is released and the mechanism becomes playback
mode when the button has been pressed again.
If the mechanism becomes fast forwarding mode, when the
PAUSE button has been gradually pressed, bend the part
(G) of pinch roller arm to the arrow direction to adjust that
the take-up reel and the pinch roller stops at the same time
as shown in Fig. 19.
Pause Bar
Pinch Roller Arm
Fig. 19
40's