Service Manuals, User Guides, Schematic Diagrams or docs for : LG VCR bc-300w sr10488b
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CIRCUIT DIAGRAMS * IC101 Voltage Sheet
PB 16.1 4.0
* IC102 Voltage Sheet
PB 4.0 0.0
1. Power, Tuner, NICAM/A2 Circuit Diagram REC 16.3
5
4.6 REC 4.0
4
0.0
No 5.3VA and 5VG, 5VT.
Switching dead. IC101 IC102
D106 is defective.
IC101 is defective. 1 1
No power. D109, C120 are defective. PB 309 0.0 0.0 PB 4.9 3.9
Power dead. No 12VA.
D102 is defective. No 14VA, 12VA are 12VT. REC 309 0.0 0.0 REC 4.9 4.0
BD101, R101 are defective. Q155 is defective.
Power dead. No 5.2VT.
F101 is defective. Q152 is defective.
Power dead.
IC102, IC103 are defective.
_ TR Voltage Sheet
Emitter Collector Base
OPTION : Hi-Fi MODEL ONLY PB REC PB REC PB REC
Q151 11.9 11.8 14.8 15.0 12.5 12.4
Q152 9.4 9.3 11.8 11.6 10.0 9.9
Q153 11.8 11.7 14.8 15.0 12.4 12.3
Q154 -27.3 -27.9 -27.3 -27.8 -26.6 -27.0
Q155 5.3 5.3 5.2 5.3 0.0 0.0
Q156 -16.1 -16.5 -16.0 -16.4 -15.4 -15.7
Q157 5.3 5.3 5.2 5.2 0.0 0.0
Q158 35.6 36.0 35.3 35.7 35.0 35.4
Q159 5.3 5.3 5.2 5.2 4.5 4.5
Q160 0.0 0.0 0.0 0.0 5.0 5.0
Q161 0.0 0.0 0.1 0.0 5.0 5.0
Q162 5.3 5.3 5.2 5.2 4.5 4.5
Q164 5.3 5.3 5.3 5.3 4.6 4.6
Q165 0.0 0.0 10.0 10.0 0.0 0.0
EE MODE(VIDEO) NOTE : * IC103 Voltage Sheet
1. Shaded( ) parts are critical for safety. Replace only
EE/PB MODE (VIDEO) NOTES) Symbol denotes AC ground.
NOTE)
NOTE)
Warning
Parts that are shaded are critical
with specified part number.
PB
Emitter
REC
Collector
PB REC PB
Base
REC
NOTE) With respect to risk of fire or 2. Voltages are DC-measured with a digital voltmeter
TU MODE (AUDIO) NOTES) Symbol denotes DC chassis ground.
NOTE) electricial shock. during TUNER mode. IC103 2.5 2.5 0.0 0.0 3.9 3.9
3-30 3-31
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