Sharp 20U250 Manual de servicio
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20U200
20U250
In the interests of user-safety (Required by safety regulations in some countries) the set should be re-
stored to its original condition and only parts identical to those specified should be used.
Ë Favorite Channel
Ë Full Auto Search System
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 Blue Back Noise Mute
Ë Front AV In and Rear AV In/Out Terminals
» SPECIFICATIONS ................................................. 2
» IMPORTANT SERVICE NOTES ........................... 2
» ADJUSTMENT PRECAUTIONS ........................... 3
» UA1 HOTEL MODE APPLICATION .................... 18
» TROUBLE SHOOTING TABLE ........................... 19
» SOLID STATE DEVICE BASE DIAGRAM .......... 21
» CHASSIS LAYOUT .............................................. 22
» BLOCK DIAGRAM............................................... 24
» WAVEFORMS ..................................................... 30
» DESCRIPTION OF SCHEMATIC DIAGRAM ...... 31
Ë MAIN UNIT (20U200/250) ............................... 32
Ë MAIN UNIT (51U200/250) ............................... 34
Ë MAIN UNIT (51U500/550) ............................... 36
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
51U200/500
51U250/550
MODELS
FEATURE
CONTENTS
Page
WARNING
SHARP CORPORATION
COLOUR TELEVISION
Chassis No. UA-1
20U200, 20U250
51U200, 51U250
51U500, 51U550
Ë Rear Sub-Woofer Terminal
Ë Front Headphone Jack
Ë Colour-Comb Filter (NTSC AV In)
Ë Hotel Mode
Ë English Language OSD
Ë Low Power Consumption
Ë AV Stereo (20U200/250, 51U200/250)
Ë NICAM/IGR Stereo Sound Output (51U500/550)
Ë CRT UNIT ........................................................ 38
Ë HEADPHONE UNIT ......................................... 39
Ë NICAM UNIT .................................................... 40
» PRINTED WIRING BOARD ASSEMBLIES ......... 41
» REPLACEMENT PARTS LIST
Ë ELECTRICAL PARTS
MAIN UNIT ...................................................... 46
CRT UNIT ........................................................ 51
HEADPHONE UNIT ......................................... 51
NICAM/IGR UNIT ............................................ 51
Ë SUPPLIED ACCESSORIES ............................ 53
Ë PACKING PARTS ............................................ 53
Ë CABINET PARTS ............................................. 53
1
20U200, 20U250
51U200, 51U250
51U500, 51U550
S90i420U200//
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