Sharp WQ-790W Service Manual

SPECIFICATIONS ............................................................................................................................................................... 1
VOLTAGE SELECTION ....................................................................................................................................................... 2
AC POWER SUPPLY CORD AND PLUG ........................................................................................................................... 2
FITTING OF DIAL POINTER ............................................................................................................................................... 2
NAMES OF PARTS ............................................................................................................................................................. 3
DISASSEMBLY .................................................................................................................................................................... 4
ADJUSTMENT ..................................................................................................................................................................... 5
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 6
VOLTAGE ............................................................................................................................................................................ 7
TYPES OF TRANSISTOR AND LED................................................................................................................................... 7
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ................................................................................................. 8
PARTS GUIDE / EXPLODED VIEW
General
Power source: AC 110-127 V/220-240 V,
50/60 Hz
DC 15 V ["D" size (UM/SUM-
1, R20 or HP-2) battery × 10]
Power consumption: 20 W
Output power: PMPO; 120 W (60 W + 60 W)
(AC operation)
MPO (Max.); 30 W
(15 W + 15 W) (AC operation)
RMS; 15 W (7.5 W + 7.5 W)
(DC operation, 10 % T.H.D.)
Speakers: 12 cm (4-3/4") free-edge
speaker × 2
5 cm (2") surround speaker × 2
Input terminal: MIC 1/2; 1 mV/600 ohms
CD/LINE; 350 mV/47 kohms
Output terminal: Headphones; 16-50 ohms
(recommended; 32 ohms)
Dimensions: Width; 630 mm (24-13/16")
Height; 205 mm (8-1/8")
Depth; 215 mm (8-1/2")
Weight: 5.3 kg (11.7 lbs.) without bat-
teries
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SERVICE MANUAL
CONTENTS

SPECIFICATIONS

Frequency range:
Frequency response:
Signal/noise ratio:
Wow and flutter:
Motor:
Bias system:
Erase system:
SHARP CORPORATION
WQ-790W
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
Radio section
FM; 88 - 108 MHz
SW1; 2.3 - 7.3 MHz
SW2; 7.3 - 22 MHz
MW; 526.5 - 1,606.5 kHz
Tape recorder section
60 - 12,000 Hz (Normal tape)
40 dB (TAPE 1, recording/playback)
55 dB (TAPE 2, playback)
0.15 % (WRMS)
DC 15 V electric governor
AC bias
Magnet erase
Specifications for this model are subject to change without
prior notice.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
WQ-790W
No. S7852WQ790W//
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