Jvc RCM 70 JWC Service Manual

Page 2

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RC-M70JW/C

Contents

Page
Specifications .............................. 2
Operating Principle of MULTI MUSIC SCANNER
Automatic program selection facility) ............ 3
Block Diagram of MMS ........................ 3
Main Parts Location .......................... 4
Removal of Parts ............................ 5
Removal of Parts of Cassette Mechanism ............ 6
Specifications of Cassette Mechanism .............. 6
Adjustment of Cassette Mechanism ................ 7
Adjustment of Cassette Recorder Amplifier .......... 7
Exploded View of Cassette Mechanism ............. 8
Parts List of Cassette Mechanism ................. 9
Tuner Alignment ............................ 10
How to Engage Dial Cord ..................... 12
Block Diagrams ............................ 12
Schematic Diagram of RC-M70JW/C (Tuner) ........ 13

Schematic Diagram of RC-M70JW/C (MMS Control) . . .14

Specifications

DIMENSIONS: 55.4 cm(W) x 30.3 cm(H) x 15.1 cm(D)

TUNER SECTION
Frequency Ranges : FM 88 - 108 MHz
MW 540 - 1600 kHz
SW1 1.6 - 4.3 MHz
SW2 4.3- 11 MHz
SW3 11 e 18.5 MHz
SW4 1825 - 26 MHz
RECORDER SECTION

Tape Speed

Track System
Recording System
Erasing System

Fast Forward Time
Rewinding Time

Wow & Flutter
AMPLIFIER SECTION
Speakers

Power 0 utput

No. 1414

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

: 4-track 2-channel stereo

: AC Bias

: AC Erasing

: Within 110 sec. (0-60 cassette)
: Within 110 secs (C-60 cassette)
: 0.065% (WRMS)

: 16 cm (6-1/2") x 2, 5 cm (2") x 2
I 7.0 W per channel, min. RMS

(100 Hz~15 kHz, 8 ohms, 10 %
THD)
Max. 30W (15W+ 15W)

Page

Schematic Diagram of RC-M70JW (Amplifier) ....... 15
Tuner, Volume and

Switch Circuit Board Assemblies .............. 16
Circuit Board Assemblies (Power Supply, Jack,

Auto-stop, MMS Switch, MMS LED, Metal LED

and Stereo LED, Motor) .................... 20
Amplifier and Muting Circuit Board Assemblies ....... 24
Wiring Connection .......................... 28
Exploded Views of Front Cabinet ................ 29
Exploded Views of Rear Cabinet ................ 32
Exploded Views of Main Chassis Assy ............. 33
Exploded Views of Tuner Chassis Ass'y and

Power Supply Assy ....................... 36
Exploded Views of Amplifier Chassis Ass'y ......... 37
Final Packing Assy ................... Back cover
Accessories ......................... Back cover

WEIGHT: Approx. 9.0 kg (with batteries)

Input Jacks : MIC x 2 (low impedance)
Line In x 2 (100 mV, 50 kfl)
Phono x 2 (3 mV, 50 kt?)

Output Jacks 2 Ext. Speaker x 2 (8 Q)

Headphones (8 - 32 9)

Line Out x 2 (250 mV,10 k0)
POWER CONSUMPTION: 40 W (JW),47 W (C)
SEMICONDUCTORS
ICs : 12 (includes microphones)
Transistors : 49 (includes motor governor)

Diodes : 64

POWER SOURCE

DC : 15 V, 10 "D, R20 cells or
equivalent

AC : 240/220/120 V, 50/60 Hz (JW)

120 V, 60 Hz (C)

Design and specifications subject to change without notice,