Electrical Adjustment Procedures; Pg Adjustment - LG TL-AT130M Service Manual

ELECTRICAL ADJUSTMENT PROCEDURES

1. PG ADJUSTMENT

MODE
PLAYBACK IN SP
1. Connect CH-1 of the oscilloscope to W357 and W362,
and adjust it to 1Vp-p as TRIGGER.
(In case of 10:1 Probe, adjust it 50m Vp-p)
2. Connect CH-2 of the oscilloscope to V.OUT JACK and
adjust it to 0.5Vp-p.
(In case of 10:1 Probe, adjust it 50 Vp-p)
3. Adjust time of the oscilloscope to 0.1 msec.
4. Adjust the range between FLLING EDGE part of video
vertical trigger signal and video vertical trigger signal
to the specification(416±20
•
CONNECTION CHART OF MAIN PWB
Caution
Caution
When repairing the power part just after pulling out the power code, there is hazard of electical shock caused by the
charged electricity at the peripheral circuit component(primary power) such as condenser C807(150 F). So begin
repairing after doing procedure below.
1. Set the volt meter up to resistance measurement.(In case of digital volt meter, set it up to over 20M
2. Discharge electicity with putting the measuring terminal lines(+, 1 probe) of volt meter at the ends of condenser
C103.(You don't have to put the polarity of the measuring terminal lines on the same polarity of the condenser.)
SECTION3 ELECTRICAL
SPECIFICATION
PG : 416 ± 20
sec
) with changing VR501.
sec
Fig 3-1. Connection chart of PG adjustment
OBJECT MEASURED
V.OUT JACK
3-1
OBJECT ADJUSTED
VR501
WAVEFORM