Sharp 20LK32, Service Manual

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1
20LK32
20LK62
COLOR TELEVISION
Chassis No. MSA
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.
S81Z420LK32//
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ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
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IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
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LOCATION OF USER'S CONTROL ..................................................................................................... 4
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INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5
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CHASSIS LAYOUT ............................................................................................................................. 13
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BLOCK DIAGRAM .............................................................................................................................. 15
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SCHEMATIC DIAGRAMS ................................................................................................................... 20
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PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 28
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REPLACEMENT PARTS LIST ............................................................................................................ 32
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PACKING OF THE SET ...................................................................................................................... 39
Page
CONTENTS
SERVICE MANUAL
MODELS
POWER INPUT ........................................ 110-220 V AC 50/60 Hz
POWER RATING
20LK32 ................................................................................ 72 W
20LK62 ................................................................................ 79 W
PICTURE SIZE .......................................... 1,194 cm 2 (185sq inch)
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................................... QPF Electrostatic
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
20LK32 ................................... 1.5 + 1.5 W (at 10% distortion)
20LK62 ................................... 3.0 + 3.0 W (at 10% distortion)
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ........................................................... 9
×
5 cm oval (2pcs.)
VOICE COIL IMPEDANCE
20LK32 ....................................................... 32 ohm at 400 Hz
20LK62 ......................................................... 4 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
Specifications are subject to change without
prior notice.
SHARP CORPORATION
20LK32
20LK62
20LK32 20LK62