Service Manuals, User Guides, Schematic Diagrams or docs for : LG VCR L224-225-227-228-229-244-247-248-249-295-297-298-299 EC490W_CIRCUIT
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CIRCUIT DIAGRAMS
1. Power Circuit Diagram
Power is dead.
No power. D109, C120 are defective.
BD101, R101 are defective.
D102 is defective. No 12VA and 12V.
No 5.3VA and 5.1V.
D106 is defective.
Switching dead.
IC101 is defective.
Power dead.
F101 is defective.
Power dead.
IC102, IC103 are defective.
NOTE :
NOTE) Warning 1. Shaded( ) parts are critical for safety. Replace only
NOTES) Symbol denotes AC ground. NOTE) Parts that are shaded are critical with specified part number.
NOTES) Symbol denotes DC chassis ground. NOTE) With respect to risk of fire or
NOTE) electricial shock. 2. Voltages are DC-measured with a digital voltmeter
during TUNER mode.
3-30 3-31
2. Tuner, NICAM, A2 Circuit Diagram
EE MODE(VIDEO)
TU MODE (AUDIO)
3-32 3-33
3. A/V Circuit Diagram
IC301 Pin70 is defective.
PB COLOR Signal disappear.
D301 or IC301 Pin 80
REC is defective.
9 3 6
1 2 2
2
IC301 Pin 84 is defective.
Audio Tracking is failed.
14 10
7
IC301 Pin 69, 68 are defective.
PB and Recording is failed.
(IC301 doesn't operate.)
4
5
8 13
11 12
X301 is defective.
PB COLOR Signal disappear.
Q302, Q303, Q304
are defective.
No mono Audio Signal
in PB MODE. FL301, Q301, Q306 are defective.
Normal Audio signal is not recorded.
PB Y+C REC Y+C REC AUDIO
PB Y REC Y PB AUDIO(MONO)
PB C REC C WAVEFORM
PB SECAM COLOR REC SECAM COLOR
3-34 3-35
4. System Circuit Diagram
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