Sharp 20F640 XFlat, Service Manual

Page: 1 / 36

SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
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.
COLOR TELEVISION
Chassis No. GA-2
Page
»
ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
»
IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
»
LOCATION OF USER'S CONTROL .....................................................................................................
4
»
INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................
5
»
SERVICE MODE ...................................................................................................................................
6
»
ADJUSTMENT METHOD ..................................................................................................................
... 7
»
CHASSIS LAYOUT .............................................................................................................................
11
»
BLOCK DIAGRAM ..............................................................................................................................
12
»
DESCRIPTION OF SCHEMATIC DIAGRAM ......................................................................................
17
»
WAVEFORMS .....................................................................................................................................
18
»
SCHEMATIC DIAGRAMS ...................................................................................................................
19
»
PRINTED WIRING BOARD ASSEMBLIES ........................................................................................
24
»
REPLACEMENT PARTS LIST ............................................................................................................
27
»
PACKING OF THE SET ......................................................................................................................
34
CONTENT
S
SPEAKER
SIZE ................................................................... 5 x 12 cm, 2pcs
VOICE COIL IMPEDANCE ............................ 16 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
(EIA, Channel Plan U.S.A.)
POWER INPUT ..................................................... AC 120 V, 60 Hz
POWER RATING .................................................................... 90W
PICTURE SIZE .......................................... 1,239 cm 2 (192sq inch)
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ................................................................................. Uni-Bi
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
(Nominal)
AUDIO POWER
OUTPUT RATING ........................................ 2.5 W(RMS) x 2pcs
Specifications are subject to change without
prior notice.
ELECTRICAL SPECIFICATIONS
MODELS
SERVICE MANUAL
20F640