Sharp 21GT-22, Service Manual

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1
21GT-22
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user – serviceable
parts inside. Refer servicing to qualified service personnel.
SERVICE MANUAL
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.
MODEL
21GT-22
SHARP CORPORATION
COLOUR TELEVISION
Chassis No. GA-1
Page
CONTENTS
»
SPECIFICATIONS ............................................. 2
»
IMPORTANT SERVICE NOTES ........................ 2
»
ADJUSTMENT PRECAUTIONS ........................ 3
»
MEMORY MAP ................................................ 11
»
GA1 HOTEL MODE APPLICATION ................ 15
»
TROUBLE SHOOTING TABLE ........................ 15
»
SOLID STATE DEVICE BASE DIAGRAM ....... 18
»
WAVEFORMS .................................................. 19
»
CHASSIS LAYOUT .......................................... 20
»
BLOCK DIAGRAM ........................................... 21
»
DESCRIPTION OF SCHEMATIC DIAGRAM .. 25
»
SCHEMATIC DIAGRAM
Ë
MAIN UNIT ................................................... 26
Ë
CRT UNIT ..................................................... 28
Page
Ë
HEADPHONE UNIT ..................................... 28
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MONO BILINGUAL UNIT ............................. 29
»
PRINTED WIRING BOARD ASSEMBLIES ..... 30
»
REPLACEMENT PARTS LIST
Ë
ELECTRICAL PARTS
MAIN UNIT ................................................... 36
CRT UNIT ..................................................... 39
HEADPHONE UNIT ..................................... 39
MONO BILINGUAL UNIT ............................. 39
Ë
SUPPLIED ACCESSORIES ......................... 40
Ë
PACKING PARTS ......................................... 40
Ë
CABINET PARTS ......................................... 41
»
PACKING OF THE SET ................................... 42
FEATURES
Ë
PAL B/G
Ë
NTSC(AV Thru)
Ë
Full Auto Channel Preset and Auto Channel Skip
Ë
100 CH Program Memory
Ë
CATV (Hyper Band) Ready
Ë
AVL (Sound Keeper) Function
Ë
High Contrast Picture (Black Stretch Circuit)
Ë
ON Timer/Sleep Timer/Reminder Timer
Ë
Favourite Channel
Ë
Blue Back Noise Mute
Ë
Front AV In (Front AV Priority)
Ë
Rear AV In/Out Terminals
Ë
Colour-Comb Filter (NTSC AV In)
Ë
Hotel Mode
Ë
Front Headphone Jack
Ë
English/Thai Language OSD
Ë
Mono Bilingual
SX2U121GT-22/