Jvc RC 838 Service Manual

Page 2

RC-838L/LB

C o ntents

Page
Specifications .............................. 2
Technical Information ...................... 3,4
Main Parts Location .......................... 5
Disassembly & Replacement .................. 6,7
Tuner Alignment ........................ 8,9,10
Amplifier Alignment ........................ 11
Specifications of Cassette Mechanism ............. 12
How to Fit Dial Cord ........................ 13
Block Diagram ............................ 14
Wiring Connection IRC-838L) .................. 15
Schematic Diagram of RC-838L/LB (Tuner) ......... 16
Schematic Diagram of RC-838L/LB (Amplifier) ...... 17
Tuner Circuit Board Assy ................... 18,19
Amplifier Circuit Board Ass'y .............. 20,21,22
Control Circuit Board Assy .................. 22,23
Switch Circuit Board Assy .................... 24
Phone Circuit Board Assy ..................... 25
Auto Stop Circuit Board Ass'y .................. 26
LED Circuit Board Ass'y ...................... 27
Connector Circuit Board Assy .................. 28
S pecrflcatlons
DIMENSIONS: 50.89miW) x 31.60mIH)x15.9cm(D)

20 x12»1/2 x 6-1/4"

TUNER SECTION

Page
Power Supply Circuit Board Ass'y (RC<838L) ........ 29
Exploded View of Power Supply Assy (RC-838M ..... 29
Exploded View of Cassette Mechanism ............ 30
List of Cassette Mechanism .................. 31,32
Exploded View of Tuner Ass'y .................. 32
Exploded View of Amp. Assy .................. 33
Exploded View of Mech. Ass'y .................. 34
Exploded View of Meter Holder Assy ............. 35
Exploded View of Chassis Ass'y .......... 36,37,38,39
Exploded View of Front Cabinet (RC-838L) ...... 40,41
Exploded View of Rear Cabinet (RC-838L) ......... 42
Final Packing Assy (RC-838L) ................. 42
Accessories (RC-838M ....................... 42
Wiring Connection (RC-838LB) ................. 43
Power Supply Circuit Board Ass'y (RC-838LB) ....... 44
Exploded View of Power Supply Ass'y (RC-838LB). . . .45
Exploded View of Front Cabinet (RC-838LB) ..... 46,47
Exploded View of Rear Cabinet (RC-838LB) ........ 48
Final Packing Ass'y (RC-838LB) ................ 49
Accessories (RC-838LB) ...................... 49

WEIGHT:

Approx. 8.1kg (with batteries)

17.8 lbs.

AMPLIFIER SECTION

Frequency Ranges

RECORDER SECTION
Tape Speed

Track System
Recording System
Erasing System

Fast Forward Time
Rewinding Time

Wow & Flutter

FM 88~108MHZ
LW 150~350kHz
MW 540~1600kHz
SW1 2t3~6MHz
SW2 5.95~6.2MH2
SW3 6~18MHZ

4.8cm/s (1-7/8 ips)

4»traok 2-channel stereo

AC Bias

AC Erasing

Within 110 sec. (C-GD cassette)
Within 110 sec. (C-60 cassette)
0.07% (WRMS)

Speakers
Power Output

16cmi6~1/2")x2, 50mi2")x2
8W(4W+4W) at 10% THD
Max. 10W (5W + 5W)

Input Jacks MIC x 2 (low impedance)
Phono x 2 (3mV, 47kg)

Output Jacks Ext. Speaker x 2 (32(2)
Headphones (89)

Input/Output Jack : DIN

POWER CONSUMPTION : 19W

SEMICONDUCTORS
ICs
Transistors

12 (includes microphones)
31 (includes motor governor)

Diodes 28

POWER SOURCE

DC 12V, 8 "U2", R20" cells or
equivalent

AC 110/220/240V, 50/60Hz

Difference between RC-838L and RC-838LB is the power supply section.

No. 1380

Page 36

RC-838L/LB

Exploded View of Chassis Ass'y (1)

.54

Fig. 55

No. 1380