JVC RC-770 L, RC-770LB, RC-770LD, RC-770LS SERVICE MANUAL

Page 1

No. 1531 June 1983

Page 2

Contents

Page
Specifications . 2
Safety Precautions 3
Locations of Controls 3
Locations of Main Parts . 4
How to Engage Dial Cord 4
Removal of the Main Parts 5
Adjustment of Cassette Mechanism 7
Tuner Alignment . 8
Adjustment of Cassette Recorder Amplifier 11
Block Diagram . 11
Standard Schematic Diagram of RC-770L/LB ((Tuner Circuit) 12
Standard Schematic Diagram of RC-770LD/LS (Tuner Circuit) . 13
Standard Schematic Diagram of RC-770L/LB (Amplifier Circuit) . 14
Standard Schematic Diagram of RC-770LD/LS (Amplifier Circuit) . 15
Wiring Connection . 16
Amplifier P.W. Board Parts and Parts List . 17
Amplifier P.W. Board Parts List . 17
Other P.W. Board Parts List . 18
Tuner P.W. Board Parts and Parts List . 19
Tuner P.W. Board Parts List (RC-770L/LB) . 19
Enclosure Assembly and Electrical Parts List . 20
Enclosure Assembly and Electrical Parts . 21
Mechanism Component Parts . 22
Mechanism Component Parts List . 23
Packing . 25
Packing Material Parts List . 25
AccessoriesBack C over

Specifications

Speakers : 12 cm (3.2 Ω)×2, 2 cm×2 Amplifier section
Tuner section Power output : Max. 6 W (3 W + 3 W) at 3.2 Ω
Frequency ranges : FM 88–108 MHz 2.2 W per channel at 10% THD
MW 540-1600 kHz Input jacks : Mic×2 (1 mV,−60 dBV,
LW 150-350 kHz 200~2 kΩ)
SW 6-18 MHz Output jacks : Headphone × 1
Antennas : Telescopic antenna for FM & SW Power supply : DC 9 V (6 ''R20'' batteries)
Ferrite core antenna for MW & LW Car battery (DC 9 V)
Tape recorder sect ion AC 240/220/110 V, 50/60 Hz
Track system : 4-Track 2-Channel stereo Power consumption : 10 W (RC-770LB), 9 W (RC-
Frequency respons e: 80–12,000 Hz 770L/LD)
Wow & flutter : 0.19% (WRMS) Dimensions : 520(W)×239(H)×136( D) mm
S/N ratio : 54 dB (Normal tape) (20-1/2″×9-1/2″×5-3/ 8 ″)
Rewind time : Approx. 120 sec. (C-60 cassette) Weight : Approx. 3.2 kg (7.0 lbs)
Fast forward time : Approx. 120 sec. (C-60 cassette) (without batteries)
Head : Permalloy Head for Playback/
Recording 2-Gap permalloy Head Design and specific ations subject to change wit hout notice.
for erasure
Motor : Electronic DC motor ×1
Page 3

Safety Precautions

▲ Safety mark

Safety is very important with this unit. When replacing the parts marked A , be sure to use only those designated parts. The designated resistors, diodes, transistors become hot in use. When replacing, be sure to secure them with a distance of more than 5 mm from the circuit board. In addition, they are banded together to avoid touching other wiring, recheck this point as well after repair.

The wiring of the primary side should be wound more than one and half times, then soldered.

Fig. 2

Locations of Controls

Page 4

Locations of Main Parts

How to Engage Dial Cord

  • 1. Turn the dial drum fully counterclockwise (to the lowest frequency).
  • 2. Use Kevlar cord (1000 mm long and 0.5 mm in diameter).
  • 3. Install the string in the sequence of the numbers.

  • 1. Rec Safety Lever
  • 2. Supply Reel Assembly
  • 3. Take-up Reel Assembly
  • 4. Counter belt
  • 5. DC motor
  • 6. O Rec Button
  • 7. Erase Head
  • 8. Rec/P.B. Head
  • 9. Pinch roller Arm Assembly
  • 10. Tape Counter

Fia. 4

Fig. 5

1. Handle Assembly

  • 2. Ferrite core antenna
  • 3. Band Switch
  • 4. Tuner P.W. Board Assembly
  • 5. Variable Capacitor
  • 6. Amplifier P.W. Board Assembly
  • 7. Tweeter speaker
  • 8. Power supply P.W. Board Assembly
  • 9. Woofer Speaker
  • 10. Tuning shaft
  • 11. Control P.W. Board Assembly
  • 12. Woofer speaker

Page 5

Removal of the Main Parts

Rear Cabinet and Telescopic Antenna (Fig. 8)

  • 1) Remove the Battery cover
  • 2) Remove 7 screws (1) fastening the Rear cabinet.
  • 3) To remove the Telescopic antenna only, remove a screw (2) fastening the T. antenna (need not the rear cabinet)
Tuner P.W. Board (Fig. 9)

  • Remove 5 screws 3 fastening the Tuner P.W. Board.
  • 2) Remove the parallel wire from the tuner P.W. Board.

When removing the parallel wire, it's convenient for connecting then again to do marking both on the wire side and socket side.

Amp P.W. Board (Fig. 9)

  • 1) Remove 4 screws (4) fastening the Amp P.W. Board
  • 2) Remove the parallel wire on the control P.W. Board.
  • 3) Remove 3 connectors.
  • 4) Cutting the wire band
Power supply P.W. Board (Fig. 9)

Remove 3 screws (5)

Control P.W. Board (Fig. 9)

  • 1) Remove 3 Volume knobs
  • 2) Remove 3 nuts (6) fastening the control volume
Mechanism assembly (Fig. 10)

  • 1) Remove 5 screws 7 fastening the mechanism ass'y.
  • 2) Open the cassette door.
  • 3) Remove the erase head wire bonded from clamp
Speaker (Fig. 10)

Remove 8 screws (8) and (9) fastening the speaker of Lch and Rch.

LED P.W. Board (Fig. 11)

  • 1) Release the hook to open the P.W. Board.
  • The hook should be cut and bonded in place after replacing the LED.

Page 6
Mechanism Parts

Fig. 12

  • 1) REC/PB head Remove a screw (
  • Remove a screw (6) for adjustment. 2) Erase head
  • Bemove a screw ( Remove a screw (8
  • 3) Pinch roller assembly

Remove an E-ring (9) holding its assembly. Pull it off from the shaft.

4) Supply reel disc

Pull out the reel disc stopper (10) and pull out its disc from shaft

If you broke the stopper, you can use E-ring (REE-1200) in place of stopper.

Fia. 13

5) Take-up reel disc Remove the counter belt (11). (Be careful not to stain the counter belt.) Pull out the reel disc stopper (12) and pull out its disc from shaft. 6) Motor Remove the main belt (13). (Be careful not to stain the main belt.)

  • Remove 3 screws (14) fastening the motor.
  • 7) Flywheel
    • 1. Remove the main belt (13).
    • 2. Remove a washer (15) fastening the capstan shaft
    • 3. Pull off the flywheel.
    • Note: When replacing the flywheel, be sure to emplov washers and spring
Page 7

Adjustment of Cassette Mechanism

Check the following items after cassette mechanism parts are replaced.

ltem Requirements Test equipment Test tape
1. Source voltage Rated voltage: 9.0 V DC
Motor operating voltage
range: 5.0–11 V DC
Regulated power supply
2. Tape speed 4.8 cm/sec
(3,000 Hz) – 2%
Deviation + 3%
Frequency counter (digital counter) VTT-656A
3. Wow & flutter Less than 0.35% (RMS) Wow meter VTT-656A
4. Take-up torque PLAY 35-75 g.cm FF 60-200 g.cm REW 60-200 g.cm During FF and rewind, the idlers,
reels and flywheel should not slip
against each other when the reels
are locked.
5. Current
consumption
(of motor alone)
PLAY150 mA or lessFF250 mA or lessREW250 mA or less DC ammeter C-60 (take-up torque
should be normal when
tape is used.)
6. Pinch roller
pressure
375~475 g Tension gauge
Pull the pinch roller perpendicularly
and read the gauge
when the pinch
roller just stops.
7. Head position
during PLAY
and RECORD
E
Cassette Guide
During PLAY (RECORD) the
dimensional requirements
given here must be met, and
the heads must not contact
the cassette case.
Any cassette tape
8. Auto-stop
operation and
extent move-
ment
40~70 g
Within 3.5~55mm
Tension gauge
Pull the Auto stop
lever perpendicularly
and read the gauge
when the mechanism
just Auto matically
stops.
Any cassette tape
Page 8

Tuner Alignment

BASIC CONDITIONS
POWER SOURCE OF THE RECEIVER DC 9 V, AC240/220/110 V, 50/60 Hz.
LOAD RESISTANCE OF THE RECEIVER 50 mW (0.4 V)/3.2 Ω
MODULATION OF SSG 400 Hz. 30%
Item Description
  • 1. AM IF ALIGNMENT
  • 1-1 Conditions of the receiver.
  • (1) Power source:
  • (2) Function switch position:
    • (3) Band select switch:
    • (4) Volume control:
    • (5) Tone control:
    • (6) Variable capacitor:
    • 1-2 Connection of Sweeper and the receiver
    • (1) Tuner input:
    • (2) Tuner output:
  • 1-3 Aligning position:
    • 1-4 Alignment (Waveform):
DC 9 V
(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.)
RADIO
MW
Minimum gain position
Center (Bass, Treble) position
Near the minimum capacity position where no signal come in.
Positive side to TP4
Positive side to TP5
Negative side to TP6
CFT, T3
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.
  • 2. FM IF ALIGNMENT
  • 2-1 Conditions of the receiver
    • (1) Power source:
    • (2) Function switch position:
    • (3) Band select switch:
    • (4) Volume control:
    • (5) Tone control:
    • (6) Variable capacitor:
  • 2-2 Connection of Sweeper and the receiver
    • (1) Tuner input:
    • (2) Tuner output:
Same as mentioned in item 1-1
RADIO
FM
Minimum gain position
Center (Bass, Treble) position
Near the minimum capacity position where no signal corne in.
Positive side to TP3
Positive side to TP5
Negative side to TP6
  • NOTE
  • a) Attach a capacitor (30 pF) and a resistor (3 Sweeper input.
  • b) Attach a resistor (100 kΩ) in series to the p
0 kΩ) to the positive side cable which shall be led from ositive side cable which shall be led from Sweeper output.
  • 2-3 Aligning position:
  • 2-4 Alignment (Waveform):
a) IF Waveform: T1
b) -Discriminate Waveform: T2
(''S'' curve waveform)
Adjust the discriminate coil (T2) so that ''S'' curve waveform
may be changed to IF waveform as shown in followin € f igure.
Ь) Discriminate Waveform: After above, adjust T1 so that max. sensitivity and syn-
metrical IF waveform can be obtained on the scope of
Sweeper.
Adjust the discriminate T2 again so that above symmer ical IF
Page 9
Item Description
  • 3. AM RF ALIGNMENT
  • 3-1 Conditions of the receiver.
  • (1) Power source:
  • (2) Function switch position:
  • (3) Volume control:
  • (4) Tone control:
  • (5) Variable capacitor:
  • 3-2 Conditions of SSG.
  • (1) Modulation:
  • (2) Frequency:
  • (3) Output level of the attenuator in SSG:
  • 3-3 Power output measuring position:
  • 3-4 Alignment:
Same as mentioned in item 1-1.
Radio
50 mW
Center (Bass, Treble) position
Refer the following list shown in item 3-4.
Refer the basic condition
Refer the following list shown in item 3-4.
Approx. 50 mW
Speaker terminals
Band Select
Switch Position
Sort of Antenna to be attached to SSG Frequency of SSG Variable Capacitor Position Aligning
Position
1 520 kHz Max. capacity L7
2 1 1,650 kHz Min. capacity TC-8
3 MW Loop Antenna tenna Ajust the above aligning position (L7 & TC-8) repeatedly so that the tuner can be received above frequency range (band width).
4 620 kHz to be received 620 kHz L4
5 1,400 kHz to be received 1,400 kHz TC-6
6 - Adjust the above align that the tuner can be ning position (L4 & TC-6) repea
obtained the best sensitivity.
itedly so
7 145 MHz Max. capacity L6
8 _ 360 MHz Min. capacity TC-7
9 LW Loop Antenna Adjust the above alig
that the tuner can be
width)
ning position (L6 & TC-7) repeating position (L6 & TC-7) repeating received above frequency rang itedly so
e (band
10 160 MHz to be received 160 MHz L3
11 350 MHz to be received 350 MHz TC-5
12 Adjust the above aligning position (L3 & TC-5) repeatedly so that the tuner can be obtained the best sensitivity.
13 5.8 MHz Max. capacity L8
14 1 18.6 MHz Min. capacity TC-4
15 sw Dummy
Antenna
Adjust the above align
that the tuner can be
width).
ning position (L8 & TC-4) repeat
received above frequency rang
tedly so
e (band
16 6.0 MHz to be received 6.0 MHz L5
17 18.0 MHz to be received 18.0 MHz TC-3
18 Adjust the above aligr
that the tuner can be
ning position (L5 & TC-3) repea
obtained the best sensitivity.
tedly so
Page 10
lte em Description
4. FI M RF ALIGNMENT
4-1 Conditions of the receiver.
(1) Power source: Same as mentione Same as mentioned in item 1-1.
(2) Function switch p position: Radio
(3) Band select swite sh: FM
(4) Volume control: 50 mW
(5) Tone control: Center (Bass, Treb le) position
(6) (6) Variable capacitor: Refer the following g list shown in item 4-3.
4-2 Condition of FM SSG.
(1) (1) Modulation: Refer the basic cor ndition
(2) Frequency: Refer the following j list shown in item 4-3.
(3) Output level of th e attenuator in FM
SSG: The level shall be decided by the load resistance of the receiver of the receiver
mentioned in the b asic conditions.
4-3 Alignment:
Band Select
Switch Position
Sort of Antenna to be attached to SSG Frequency of SSG Variable Capacitor Position Aligning
Position
1 87.5 MHz Max. capacity L2
2 109.0 MHz Min. capacity TC-2
3 FM Dummy
Antenna
Ajust the above aligni the tuner can be recei ng position (L2 & TC-2) repeat
ved above frequency range (ba
edly so that
ind width).
4 90 MHz to be received 90 MHz L1
5 108 MHz to be received 108 MHz TC-1
6 Adjust the above aligr that the tuner can be ning position (L1 & TC-1) repeat
obtained the best sensitivity.
itedly so
FM MPX Alignment

  • 19 kHz Alignment (Regular Method)
  • 1. Connect a frequency counter to the test point TP7 (earth = TP6).
  • Supply the monaural signal (98 MHz, 60 dB) across the test points TP1 and TP2.
Parts Arrangement for Alignment

3. Adjust the variable resistor VR1 so that the frequency becomes 19 kHz ± 100 Hz.

Dummy Antenna

R1 + R2 = 80 Ω C = 10 pF R1: Output impedance of S.S. G.

Page 11

Adjustment of Cassette Recorder Amplifier

Fig. 15
Model RC-770 L/LB/LD/LS Cassette section
Source voltage DC : 9 V, Load 0 dBS (0.775 V)/3.2Ω
AC : 240/220/110 V Input MIC. – 58 dBS TUNER – 29 dBS
Step Item Adjus tment method
1 Speed and wow/flutter When measured by wow/flutter m
equivalent, wow/flutter should be
curacy should be within +15 Hz,
neter with test
within 0.35% I
– 15 Hz at 30
tape VTT-656 (3000 Hz) or its
RMS. At this time, tape speed ac-
20 Hz.
2 Azimuth Play back test tape VTT-658, then ed. Play back test tape VTT-658, then adjust azimuth so that output at TP-1 is maximized.
3 PB level Playback test tape VTT-664, then adjust VR101 and VR201 so that outputs at TP-1 and TP-2 become -21±0.5 dBs.
4 PB frequency response
(checking)
Use test tape VTT675N or the equipment of the sequence of the should be as follows at 0 dB and 1 Use test tape VTT675N or the equivalent. The values should be as follows at 0 dB and 1000 Hz.
250Hz 10kHz 12.5kHz
3dB 4dB
5 Frequency of bias current Cut off the TUNER input and put the unit into REC mode with BEAT CUT switch at ''1'', then adjust L301 so that frequency of bias current at TP-4 becomes 67.5 kHz ± 0.1 kHz.
6 Magnitude of bias current Cut off the TUNER input, then adju
currents become 420 μA (voltages
10 Ω are 4.2 mV).
st VR301 and at TP-4 across VR302 so that Rch and Lch head
R128 10 Ω at TP-5 across R228
7 REC/PB level Apply input at – 38 dBs from TUN and PB levels at TP-1 and TP-2 are ER, then adjust
equal (within
t VR102 and VR202 so that REC ± 1 dB).
8 REC/PB frequency
response (checking)
Record the following specified sign
recording. Then, the respective dev
should be within the following rang
Normal tape :
nals at input lev
viations in outp
ges.
vel of – 20 dB and play back the
but level from 1000 Hz reference
9 Dolby effect Put the unit into PLAY mode withor
check that output difference betwee
and OFF with the following filter is
out cassette, th
een Dolby ON
9 dB ±2 dB.

Block Diagram

Tuner Signal Diagram

Recording System

Play Back System

Signal Diagram

(No. 1531) 11

Page 12

Fig. 19

Page 13

Fig. 20

Page 14

Page 15

RC-770 L/LB/LD/LS

Page 16

RC-770 L/LB/LD/LS

(No. 1531) 16

Page 17

Amplifier P.W. Board Parts and Parts List

Dolby ON/OFF

Level Adjust (P)

3 kΩ

Beat Cut

CN101

QMV5004-006

QMV5005-002

QMV5004-002

Connector

J102

QMS6312-012 Head Phone Jack

M51544L

BA1102F

PRE. Amp

Dolby Amp

S103

S104

VR101,201

QSS1201-026

QSS1301-101G

QVP8A0B-033 V. Resistor

2SC536(H)

2SC1684(R,S)

Q301

Q402

Page 18

▲ parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

Other P.W. Board Parts List

( 1
Ref. No. Parts No. Parts Name Remarks Q′ty
Q401
D101,201
2SC1317(R,S)
MA165

Si. Diode
1 2
D102,202
D401,402
L101,201

HZ6C3
VQP0001-473S
"
Zener Diode
Inductor
2
2
2
L102,202
L103,203
VQP0001-472S
VQP0001-562SV
" 2
2
L301
C101,201
C102,202
VQH1009-026
QET41HR-104
QCY41HK-122
OSC Coil
E. Capacitor
C. Capacitor
1 μF 50 V
0.0012 μF
2
2
2″
C103,203 QET41HR-475 E. Capacitor 4.7 μF ″
100 μF 10 V
2
C104,204
C105,205
C106,206
C107,207
QET41AR-107
QET41ER-226
″-106
QCY41HK-102


C. Capacitor
22 μF 25 V
10 μF ″
0.001μF 50 V
2
2
2
2
C108,208
C109
QFV41HJ-683
QET41AR-476
T.F. Capacitor
E. Capacitor
0.068μF ″
47 μF 10 V
2
1
C110
C111
C112 212
QET41ER-226
QET41AR-227
QCX41HK-682

22 μF 25 V
220 μF 10 V
0.0068μE 50 V
1
1
2
C113,213
C114,214
C115,215
QET41ER-106
QFN41HJ-472
QET41ER-475
E. Capacitor
M. Capacitor
E. Capacitor
10 μF 25 V
0.0047μF 50 V
4.7 μF 25 V
2
2
2
C116,216
C117,217
QFV41HP-333
QCC11EM-103
T.F. Capacitor
C. Capacitor
0.033μF 50 V
0.01μF 25 V
2
2
C118,218
C119,219
C120,220
QET41ER-475
QET41HR-104
QEB41HM-334
E, Capacitor 4.7 μF ″
0.1 μF 50 V
0.33 μF ″
2
2
C120,220
C121,221
C122
QCY41HK-102
QET41ER-226
C. Capacitor
E. Capacitor
0.001 μF ″
22 μF 25 V
2
1
C123,223
C124,224
C125,225
C126,226
QET41ER-106
QCC11EM-154
QET41AR-336
QET41AR-477
"
C. Capacitor
E. Capacitor
"
10 μF ″
0.15 μF ″
33 μF 10 V
470 μF ″
2
2
2
2
C127,227
C128
QET41HR-335
QET41ER-106
" 3.3 μF 50 V
10 μF 25 V
2
C129,229
C130,230
C131,231
C132,232
QET41HR-105
QFV41HJ-333
QET41HR-105
QCS11HJ-121
"
T.F. Capacitor
E. Capacitor
C. Capacitor
1 μF 50 V
0.033μF ″
1 μF ″
120 pF ″
2
2
2
2
C134,234
C135,235
C136,237
C138,238
C129,239
QET41HR-335
QCY21HK-471
QCS11HJ-151
QCY11HK-102
E. Capacitor
C. Capacitor
"
"
3.3 μF "
470 pF 50 V
150 pF "
0.001 μF "
100 pF "
2
2
2
2
2
C140,240
C141,241
C301
C302
QCC11EM-223
QCS11HJ-101
QCY41HK-272
QCC11EM-223
" 0.022μF 25 V
100 pF 50 V
0.0027μF ″
0.022μF 25 V
2
2
1
1
C304
C305
QFN41HJ-273
QCY41HK-682
M. Capacitor
C. Capacitor
0.027μF 50 V
0.0068μF ″
C306
C307,308
C401
C402
QCY41HJ-682
QCS11HJ-301
QET41CR-228
QET41AR-108
E. Capacitor 300 pF ″
2200 μF 16 V
1000 μF 10 V
1
2
1
1
C403
C404
″ -476
″ -107
"" 47 μF ″
100 μF ″
1
C406
C407
C408
// -477
// -337
// -107
"" 470 μF ″
330 μF ″
100 μF ″
1
1
1
C409
C410
C411
" -107
" -337
" -227
"
"
″″″″
330 μF″
220 μF″
1

R403
QRD161J-xxx
QRD141J-100
Carbon Resistor
Fusible Resistor
- 1/6 W
1 Ω 1/4 W
69
1
Ref. No. Parts No. Parts Name Remarks Q′ty
8-001B> P.W. Board (fo r ST. IND)
D3 LN224RP LED 1
trol Ass′y>
VMW1 064-00XB P.W. Board
VR501,601 QVN5A2A-054M V. Resistor Treble 50 kΩ 2
VR502,602 QVN5A2D-024M " Bass 20 kΩ 2
VR503,603 QVN5A2A-054M " Volume 50 kΩ 2
Q501,601 2SC1684(R,S) Transistor 2
C501,601 QET41HR-105 E. Capacitor 1 μF 50 V 2
C502,602 ″ -105 " " " 2
C503,603 QCY41HK-682 C. Capacitor 0.0068µF″ 2
C504,604 QCC11EM-333 " 0.033µF 25 V 2
C505,605 QCY41HK-222 " 0.0022 μ 50 V 2
C506,606 QET41HR-154 " Ο.15 μF ″ 2
R501,601 QRD161J-224 C. Resistor 220 kΩ 1/6 W 2
R502,602 ″ -222 " 2.2 kΩ ″ 2
R503,603 ″ -221 " 220 Ω ″ 2
R504,604 ″ -103 " 10 kΩ ″ 2
R505,605 ″ -222 " 2.2 kΩ ″ 2
R506,606 ″ -472 " 4.7 kΩ ″ 2
pply Ass'y>
VMW1064 -OOXC P.W. Board C. Divite
D701,702 TUE2 2
0703,704 0051140 222 C. Conneitor 2
C707,702 200F11HP-223 2
0705 -223
11F2
Si Diode
0700
J701 - QMC0263-002 AC. Socket
1700 DC leak LB
5702 QIVIAU921-005
3701 - USSZ3Z5-10785
// 107
| ' |
107
\/NID4003-037
Fuse Label
VYH5422-001 Barrier IB
1110422 001 Samo

DIN P. W. Board (RC-770LD/LS)

Amp. P.W. Board (RC-770LD/LS)

Fig. 25

+B Earth

DIN P. W. Board (RC-770LD/LS)

Ref. No. Parts No. Parts Name Remarks Qʻty
J801 QMC9014-006 DIN Jack Ass'y 1
Q801,901 2SC1843 (F) Transistor 4
802,902
D801,901 MA165 Si. Diode 4
802,902
R802,902 QRD144J-103S C. Resistor 10 kΩ 1/4 W 2
R803,903 ″ -181S " 180 Ω ″ 2
R804,904 ″ -332S " 3.3 kΩ ″ 2
R805,905 ″ -155S " 1.5 MΩ ″ 2
R806,906 ″ -151S " 150 Ω ″ 2
R807,907 ″ -332S " 3.3 kΩ ″ 2
R808,908 ″ -225S " 2.2 MΩ ″ 2
R809,909 ″ -472S " 4.7 kΩ ″ 2
R810,910 ″ -224S " 220 kΩ ″ 2
R451 ″ -222S " 2.2 kΩ ″ 1
C801 ~ 804 QET41HR-105 E. Capacitor 1 μF 50 V 8
901 ~ 904
C805,905 QCS11HJ-471 C. Capacitor 470 pF ″ 2
C451 QET41AR-476 E. Capacitor 47 μF 10 V 1
C452 ″ -107 " 100 μF ″ 1
CN801 QMV5004-007 Connector 1

Amp. P.W. Board Parts List (RC-770LD/LS)

Ref. No. Parts No. Parts Name Remarks Q'ty
S105 QST3101-V04 Push Switch RADO/DIN 1
C116,216 QFV41HJ-333 T.F. Capacitor 0.0 3 µ F 50 V 2
C117,217 ″ -103 " 0.01 µF ″ 2
C118,218 QET41HR-475 E. Capacitor 4.7 L F " 2
C119,219 QFV41HJ-104 T.F. Capacitor 0.1 µ F ″ 2
C120,220 ″ -333 " 0.03 3 µF ″ 2
C126,226 QETC1AM-477 " ″ F بر470 2
C139,239 QCS11HJ-101 " 100pF " 2
C304 QFV41HJ-273 " 0.02 7 µF ″ | 1
C306 QCY41HK-821 C. Capacitor 820pF ″ 1
C310 QET41CR-477 E. Capacitor 470µF 16 V 1
C406 QETC1AM-477 " ″ 10 V 1
C407 ″ -337 " " F آير330 1
C411 QET41AR-337 " " " 1
R QRD161J-xxx C. Resistor 1/6 W 66
R409 QRD121J-1R0 " 1 Ω 1/2 W 1
Page 19

Tuner P.W. Board Only Parts List (RC-770LD/LS)

Ref. No. Parts No. Parts Name Remarks Q′ty Ref. No. Parts No. Parts Name Remarks Qʻty
L1
L2
IC1
R1
R2
VQF1B12-001
V03105-029
TA7358A
QRD161J-101
″ -271
RF Coil
OSC Coil
IC
C. Resistor
(FM)

100 Ω 1/6 W
270 Ω ″
1
1
1
1
C9

C14
QCT05CH-220
QCT05CH-150
QCS11HJ-200
" -470
C. Capacitor 22 pF 50 V
(LD)
15 pF ″ (LS)
20 pF ″ (LD)
47 pF ″ (LS)
1
1
1
1
R3
R4
R16
"
R36
C1
"-393
"-334
"-561
"-102
"-220
QCS11HJ-180
"
"
C. Capacitor
39 kΩ ″
330 kΩ ″
560 Ω ″ (LD)
1 kΩ ″ (LS)
22 Ω ″
18 pF 50 V
1
1
1
1
1
C17
~
C39
C62,63
C64
~
"-100
"-8R0
QCC11EM-473
QCF11HP-103
QCT05CH-2R0
"-3R0
"" " 10 pF " (LD) 8 pF " (LS) 0.047 μF 25 V 0.01 μF 50 V 2 pF " (LD) 3 pF " (LD) 1
1
1
1
1
1
C2
C3
C4
C5
C6
"-150
"-220
QCY11HK-472
QCT05CH-100
"-200
"-180
"""""""""""""""""""""""""""""""""""""" 15 pF " 22 pF " 0.0047μF " 10 pF " 20 pF " (LD) 18 pF " (LS) 1
1
1
1
1
D1
D2
D4
MA165
1S553T
MA165
Diode
Variable
Capacitor
Diode
(LD) 1

Tuner P.W. Board Parts List (RC-770L/LB)

A parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

Ref. No. Parts No. Parts Name Remarks Q′ty Ref. No. Parts No. Parts Name Remarks Qʻty
VC-1~4
TC-1~4
QAP1224-520V V. Capacitor 4 L3,4 VQB012B-314 Ferrite Core
Antenna Ass'y
2
TC5,6,7,8 QAT2002-001 T. Capacitor 4 T1 VQT7F12-104 IFT 1
VC5 QAT5001-004 M.V. Capacitor 1 T2 ″ -104 " 1
VR1 QVZ3512-103 V. Resistor 1 ТЗ VQT7A11-203 IFT 1
L1 VQF1B12-007 RF Coil FM 1 CF1,2 VCF2L3B-301 C. Filter 2
L2 VQB1B10-001 OSC Coil " 1 CFT VQT7A21-102 CFT 1
L5 VQR7002-302 RF Coil sw 1 BPT VBP4M3B-001 Band Pass Filter 1
L6 VQL7T19-301 OSC Coil LW 1 LPF VQZ0020-001 Low Pass Filter 1
L7 VQM7U01-301 " MW 1 IC1 AN7213 IC 1
L8 VQR7002-302 " sw | 1 | IC2 AN7222N " 1
L9 V03047-21 Coil 1 IC3 AN7410N " 1
Page 20

RC-770 L/LB/LD/LS

Remarks

47 Ω 1/6 W 220 kΩ ″ 68 Ω ″

1 kΩ

47 Ω 3.3 kΩ 470 Ω

3.9 kΩ

27 κΩ 470 Ω 100 κΩ 1 κΩ

2.2 kΩ

Q'ty

Parts Name

C. Resistor

▲ parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

A parts are safety assurance parts.

Enclosure Assembly and Electrical Parts List When replacing those parts, make sure to use the specified one.

Ref. No. Parts No. Parts Name Remarks Q'ty Ref. No. Parts No.
Q1 2SC1359(C) Si. Transistor 1 R11 QRD161J-470
Q2 2SC828(Q,R) " 2 R12 ″ -22
D1 MA165 Si. Diode 2 R13 ″-68
″68
D2
S1-1~8
1S553T
QSS8401-101
Slide Switch 8 R15 -68
57 0551201-026 " 1 B17 "-47
C1 QCS11HJ-100 C. Capacitor 10 pF 50 V 1 R18 ″ -33
C2 QCF11HP-223 " 0.022µF ″ 1 R19 ″-47
C3 QCS11HJ-240 " 24 pF " 1 R21 ″-47
″-39
C5 UC105CH-150 " IS pr 1 R22 -39
C6
C7
-5R0
OCT05UJ-5B0
" 5 pF " 1 R24 -22
C8 QCF11HP-103 " 0.01 μF ″ 1 R26 ″-47
C9 QCT05CH-150 " 15 pF ″ 1 R27 "-10
C10 QCY11HK-472 " 0.0047µF " R28 -10
C11 QCF11HP-223 " 0.022 μF 50 V 1 R29 // -18
// -22
C12 " 0.01 μF
47 nF ″
R32,33 -22
C14 ″ -390 " 39 pF ″ 1 1104 10
C16 ″ -120 " 12 pF ″ 1
C17 ″ -8R0 " 8 pF ″ 1
C18 " -100 " 10 pF ″ 1
C19 -470 47 pF ″
C20 OCT05WK-120 " 12 pF " 1
C22 // PPO " 8 pF 1
C22 OCS11HJ-150 " 15 pF 50 V 1
C24 QFP42AJ-151 P.P. Capacitor 150 pF 1
C25 ″ -361 " 360 µF 1
C26 ″ -392 " 0.0039 μF 1
C27 QCS11HJ-150 C. Capacitor 15 pF 50 V 1
C28 QCF11HP-223 " 0.022μF50 V
C30 0CC11EM-223 " 0.022 µF ″ 1
C31 QCF11HP-103 " 0.01 μF ″ 1
C32 QET41AR-476 E. Capacitor 47 μF 10 V 1
C33 QEN41EM-475 " 4.7 μF 25 V 1
C34 QET41HR-105 1 μF 50 V
C35,36 0CC11FM-223 0.022 μF 1
C28 0001111121 " 120 pE 50 V 1
C39 QCC11EM-223 " 0.022 µF 25 V 1
C40,42,43 QET41ER-106 E. Capacitor 10 μF ″ 3
C45 QET41AR-476 " 47 μF 10 V 1
C46 QCF11HP-223 C. Capacitor 0.022 µF 50 V 1
C48 QET41HR-105 E. Capacitor 1 μF ″
C49 0CE11HP-223 0.022 µF 50 V
C51~53 QET41HR-474 E. Capacitor 0.47 μF ″ 1
C54 QFP42AJ-471 P.P. Capacitor 470 pF 1
C56,57 QCC11EM-153 C. Capacitor 0.015µF25 V 2
C58,59 QET41HR-475 E. Capacitor 4.7 μF 50 V 2
C60 -105
05741AD 477
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 μF "
470 μF 10 V
1
C63 QCT05CH-3R0 " 3 pF 16 V 1
CN1 E04365-004 Connector 1
R1 QRD161J-101 C. Resistor 100 Ω 1/6 W 1
R2 ″ -271 " 270 Ω ″ | 1 |
R3 ″ -393 " 39 kΩ ″
R4 -184 180 KW
R5 -471 " 470 Ω ″
100 kΩ ″
| H6
| B7
-104
″104
" //// K12
R8 ″ -470 " 47Ω ″ 1
R9 ″ -470 " " " 1
R10 ″ -101 " 100 Ω ″ 1
Ref. No. Parts No. Parts Name Remarks Q'ty
1~2
1
ZCRC770Y-CBF
VJC1289-010A
″-104
Front Cabinet Ass'y
Front Cabinet
RC-770L/LB
RC-770LD/LS
1
1
1
2
3
4
VJD3409-001
VJD3410-001
VJK3211-004
″-003
Punching Panel
Control Plate
Dial Scale
RC-770L/LB/LS
RC-770LD
2
1
1
1
5
6
7
VJD3411-001
VJD3412-001
VJK3210-002
″001
Control Plate
LED Lens
Dial Lens
RFC-770L/LB
RC-770LD/LS
Woofer
1
1
1
1
2
9 SBSF3008Z Screw for Speaker 8
10
11
12
13
14
EFB-S77D41
VYH4832-002
GBSF3020Z
VYH4034-002
VYH4032-001
Speaker
Dial Dram
Screw
Stud
Roller
Tweeter
for Dial Dram
for Roller
2
1
1
2
2
15
16
17
18
VJN4081-001
VHR2TK9-05AT
50153-3
VYH5270-001
Pointer
Dial Cord
Spring
Tuning Bushing
for Cord 1
1 set
1
1
19
20
21
22
23
SBSF3010Z
VYH4027-006
REE4000X
VXS4109-001
VXQ3038-001
Screw
Tuning Shaft
E-ring
Slide Knob
Toggle Lever
for Tuning Bushing
for T. Shaft
for Stereo-Mono
for Band
2
1
1
1
1
24
25
26
27
28
VYH5269-001
SBSF3020C
VYH5267-001
SSSP2608
VYH5274-001
Lever Holder
Screw
Arm
Screw
Connector
for Tuner ~ Cabinet 1
5
1
1
1
29
30
31
32
33
VMME62N-031
VYH4043-002
VYH5271-001
WNS2600Z
NTB2600
E.C. Mic
Special Screw
Rec Lever
Washer
Nut
2
1
1
2
1
34
35
36
37
38
VYH4348-001
VYH5268-001
SBSF3014Z
VXQ4058-001
VXQ4109-001
Mic Busing
Bridge
Screw
Lever Cap
Slide Knob
Tap→ Radio
Dolby
2
4
3
1
1
39
40
41
42
SPSP3006C
WBS3000
SBSF3010C
Screw
T. Lock Washer
Screw
Mecha ~ Amp
Mecha ~ Cabinet
Amp ~ Cabinet
1
1
6
3
43 VTP48N2-90F
VTP48C2-90FBS
T701 RC-770LB 1
44
45-1
45-2
46
QMF51A2-R80
* -R80BS
SBSF3014Z
GBSF3020C
VJC1290-104
*
Fuse
Screw
Rear Cabinet
RC-770L/LD/LS
RC-770LB
Power P.W.B.
Power Transformer
RC-770L/LB
1
1
2
1
47
48
VJA3006-00C
VYH5278-001
Telescopic Antenna
Ant Contact
49
50
51
52
53
SDSP3012R
VJH4036-00C
VYSS2R3-002
VYH4696-001
VYH5279-001
Screw
Handle Ass'y
Spacer
Spring
Battery Spring
for Antenna
for Handle
1
1
2
2
1
54
55
56
57
58
VYH5280-002
SBSF3020R
VJC2016-006
VYSH108-016
VYN5089-009
″-007
″-011
Battery Contact
Screw
Battery Cover
Spacer
Name Plate
Front ~ Rear
for Battery Cover
RC-770LB
RC-770LD/LS
RC-770LS
1
7
1
1
1
1
59
60
VJT3115-00A
VYH4941-002
Door Ass'y
Door Spring
1
Page 21

Enclosure Assembly and Electrical Parts

nel. NO. Faits NO. Faits Maine nemarks ury
61
62
63
64
65
VXL4193-001
VXL4107-101
VXL4194-001
Q03095-206
VYH5381-001
Tuning Knob
Knob
Fine Knob
Washer
Spring Connector
1
3
1
3
1
66
67
68
69
VYH5276-001
LPSP2604Z
VKZ4001-010
VYTH417-001
Rec. Spring Plate
Screw
Wire Holder
Blind
1
1
3
1
Ref. No. Parts No. Parts Name Remarks Q'ty
70
71
72
73
74
VYSA1R4-050 Spacer

Shield
Spacer
4
3
4
1
1
75
76
77
VYSH104-022
VXP4378-001
VYH5472-001

Push Knob
Bracket
RC-770LD
″ for DIN Jack
1
1
1

(No. 1531) 21

RC-770 L/LB/LD/LS

Page 22

Fig. 29 (No. 1531) 22

Page 23
Mechanical Component Parts List

A parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

Ref. No. Parts No. Parts Name Remarks Q'ty
1 180001501ZT Mecha. Chassis Ass'y 1
2 18000201T Rec. Safety Lever 1
3 18000316T Head Panel 1
4 18000305T Head Base
5 18000330521 Detector Plate Ass'y 1
6 VGH0421-010 R/P Head 1
14400315T Head Spring 2
8 V03078-046 E. Head
Binch Bollor Arm Ass'y
10 18000405T Pinch Boller Spring 1
10 100004001 1
18000530121
18000508T
Back Tension Spring 1
13 1800053027T Supply Reel Ass'y
14 18000516T Back Tension Spring 1
15 180006310ZT RF. Cluth Ass'y 1
17 180006503ZT Take-up Roller Arm Ass'v 1
18 18000635T Take-up Roller 1
19 18000609T Collar 1
21 18000610T F.F. Gear 1
22 180007312ZT Flywheel Ass'y 1
24 15100134T Pack Spring 1
25-1 18000934 Button Base (R) 1
25-2 18000935B (L) 1
26 18000902T Rec. Button Lever
21 180009041 Play Button Lever
28 18000906T Rew. Button Lever
29 180009081 F.F. Button Lever 1
30 180009091 Stop Button Lever 1
32 1800093107T Lock Plate Ass'v 1
22 170009217 1
34 18000917T 1
35 VXP3081-001 Push Button for Play 1
36 VXP3082-001 " for Pause | 1 |
37 ″ -002 " for Stop/Eject 1
38 ″ -003 " for F.F. 1
39 ″ -004 " for Rew. | 1 |
40 VXP3083-002 for Rec.
41 18000918T Flange Cup Screw 6
42 18001032721
43 18001033T Motor Bracket
58809101 Rubber Cushion 3
45 120012011
15221202T
Mat 2
47 4081203T Main Belt 1
48 12221702T Pause Lever 1
49 18201032T Pause Stopper
50 18001310T Counter Bracket
51 18001102T Eject Slide Lever 1
52 L 17000310T Collar Screw 1
53 VKC5169-001S Tape Counter
54 2111202T Counter Belt
55 LSA-1120C01T Leaf Switch
| 70 97870000T Polyslider Washer for Capstan 1
71 07760000T " ($\vec{\vec{\vec{\vec{\vec{\vec{\vec{ 1
377000001 (d2.05 x d8 x t0.5)
70 042100007 Polyolidor Washer
/2 942100001 for F F Gear × 1 2
($\phi1.2 \times 63 \times t0.25)
73 15601501T Washer B/P Head ($\phi_1 1 \times \phi_5 \times t_0 4) 1 1
Page 24

A parts are safety assurance parts.

When replacing those narts. make sure to use e the specified one.
***** ropiaonig 11000 001.001 11 June O ouro
Ref. No. Parts No. Parts Name Remarks Qʻty
74 16100604T Polyslider Washer for Supply Reel Ass'y × 1
for Take-up Reel Ass'y × 1
(\u03c61.6 × \u03c63.8 × t0.3)
2
75 18000907T Spring for FF Button 1
76 18000608⊤ for Take-up Roller Arm 1
77 18000903T " for Rec. Button 1
78 18000957T for Play Button 1
79 18000905T " for Rew. Button × 1 1
80 18000903T for Stop Button 1
81 18000957T "
"
for Pause Button
82 180009191 " for Thrust Spring 1
83 180007071
84 18000961T " for Auto Lever 1
85 180009581 for Figet Slide Lover 1
80 180011281
200726040T
Tan Screw for Peak Spring x 1 Mat x 2 3
88 17152015T Stopper for Pinch Roller Arm Ass'v 1
89 SPSD2004Z TH. Tap. Screw for Take-up Roller × 1,
Button Base × 2
3
90 SPSE20067 Tap. Screw for Leaf Switch 1
92 SPSX2007Z PM. Screw for R/P Head 1
93 98210000T Screw 2
97 98200000T Cap Screw for R/P Head 1
98 13270412AT U Washer for E. Head 1
99 93330000T Washer for E. Head | 1
(\phi 2.4 \times \phi 7 \times t0.2)
100 18001404T RC Spring
102 180003091 Tor Head Panel
103 986100001 in. rap. Sciew
106 18001127T Collar for Eject Slide Lever
107 SPSD3008Z IH. Tap. Screw
108 33373000Z BE Pulley Arm Stopper
110 97180000231 Collar Screw for Button Base 1
Page 25

RC-770 L/LB/LD/LS

Packing

Packing Material Parts List
Ref. No. Parts No. Parts Name Remarks Q'ty
1 VPD5089-J01 Carton RC-770LB 1
″ -J04 " RC-770L 1
″ -J08 " RC-770LD 1
″ -J10 " RC-770LS 1
2 VPH1269-001 Side Cushion (L) 1
3 VPH1270-001 ″ (R) 1
5 QPGA012-01505 Poly Bag for Power Cord 1
6 QPGB017-02404 " for Instruction Book 1
7 VPE3002-008 " RC-770LB 1
QPGA070-04005 " RC-770L/LD 1
8 VPH4101-006 Door Protector 1
Page 26

Accessories

Parts No. Parts Name Remarks Qʻty
VNM0906-301 Instruction Book RC-770L/LB 1
VNF0903-001 Feature Tag RC-770L/LB 1
VNF0904-001 " RC-770LD 1
BT20013C Guarantee Certificate RC-770LB 1
QMP3950-183 Power Cord RC-770L/LD 1
QMP9017-009BS " RC-770LB 1
QZL1002-003 Warning Label RC-770LB 1
31465-18 Mark RC-770LB | 1
VPZ4001-001 Serial Ticket | 1
BT20054-003A Caution Card RC-770LD | 1
BT20065 Warranty Card " 1
BT20066 " " 1
VNM0906-302 Instruction Book RC-770LD/LS 1
VGT12S2-J05 Cassette Tape RC-770LS | 1

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