Sharp VT-3448X, Service Manual

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I
S H A R P
SERVICE MANUAL
TV/VCR COMBINATION
,
MODELS
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.
FEATURE
n
Full Auto Search Tuning System
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On Screen Digital Channel/Sound Level/Tuning
Display, Control (Contrast, Brightness, Tint, P-
Tone) Symbol and Level
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Blue Back Off Timer
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Key, Wireless Remote Control Unit
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Channel Skip
n
High Speed and Double Speed Video Search System
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PAL : 3 times
@ : 3 times
5 times
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(Digital Program Search System)
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Quick Start Playback with Full Loading System
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Digital Automatic Tracking Control
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Automatic Playback Function
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(Automatic Head Cleaning System)
n
Sharp Super Picture
CONTENTS
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SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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IMPORTANT SERVICE NOTES . . . . . . . . . . . ..a............ 3
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LOCATION OF USER’S CONTROL . . . . . . . . . . . . . . . . . . . . 4
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DISASSEMBLY AND REASSEMBLY . . . . . . . . . . . . . . . . . . 6
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ADJUSTMENT OF THE TV ELECTRICAL
CIRCUITRY . . . . . . . . . . . . . . . . . .
9
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PRECAUTIONS IN REASSEMBLING . . . . . . . . . . . . . . .
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FUNCTION OF MAJOR MECHANICAL
PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ADJUSTMENT, REPLACEMENTAND
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TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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CHASSIS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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BLOCK DIAGRAM OF TV SECTION . . . . . . . . . . . . . . . . .
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DESCRIPTION OF TV SECTION
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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BLOCK DIAGRAM OF VCR SECTION . . . . . . . . . . . . .
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DESCRIPTION OF VCR SECTION
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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PRINTED WIRING BOARD ASSEMBLIES......
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ASSEMBLY OF MECHANICAL UNITS . . . . . . . . . . . . . .
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . .
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PACKING
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ADJUSTMENT OF THE VCR
OF THE SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL CIRCUITRY . . . . . . . . . . . . . . . . . . . . . . . ..a......
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord and
receptacle,
when servicing this chassis.
prevent electric shock, do not remove
cover.
No user
serviceable parts inside.
Refer servicing to qualified service personnel.
SHARP CORPORATION