Electrical Adjustment Procedures - LG GC260W Service Manual

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment
1) PG Adjustment
• Test Equipment
a) OSCILLOSCOPE
b) PAL TEST TAPE (VHS SP)
c) JIG REMOCON (AUTO PG SETTING)
• Adjustment And Specification
MODE
PLAY
• Adjustment Procedure
a) Insert the PAL SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the "ATR" is blink after the
PAL SP Test Tape is inserted.
b) Press "Play" key on set and "0" key on Remocon.(Then check the blink "TRK OK" (Hi-Fi Model), "ALL
LIGHT"(MONO Model) on CLK/LED
-TRK is a Initial)
c) Press "Play" key on set and "0" key on Remocon again.(Then check the blink "PG NG > PG OK" on
CLK/LED(Hi-Fi Model), Then check the blink "PG waveform" on oscilloscope(MONO Model)).
• Check the PG
a) Connect the CH1 of the oscilloscope to the H/SW and CD2 to the Video out for the VCR.
b) Trigger the mixed Video Signal of CH2 to the CH1 H/SW(W714, W715), and then check the distance
(time difference), which is from the selected A(B) Head point of the H/SW(W714, W715) signal to the
starting point of the vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64.0µs).
• CONNECTION
MEASUREMENT POINT
V.Out
H/SW(W714, W715)
V.Out
H/SW(W714,W715)
ADJUSTMENT POINT
OSCILLOSCOPE
3-2
SPECIFICATION
6.5 ± 0.5H
CH1 CH2
H/SW V.out
(W714, W715)