LG TL-AT130M User Manual

Page 11

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3-1

SECTION3 ELECTRICAL

ELECTRICAL ADJUSTMENT PROCEDURES

1. PG ADJUSTMENT

MODE

SPECIFICATION

OBJECT MEASURED

OBJECT ADJUSTED

PLAYBACK IN SP

PG : 416 ± 20

sec

V.OUT JACK

VR501

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

sec

) with changing VR501.

WAVEFORM

CONNECTION CHART OF MAIN PWB

Fig 3-1. Connection chart of PG adjustment

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

µ

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

Ω.)

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.)

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