Circuit Adjustments; D Board Adjustments; Horizontal Oscillating Frequency Adjustment (Rv503); Video Phase Adjustment (Rv512, Rv516, Rv502) - Sony TRINITRON PVM-8042Q Service Manual

5-1. D BOARD ADJUSTMENTS

IC502
!/
CN501
RV503
3
1
RV518
RV511 RV505
RV512 RV517
5-1-1. Horizontal Oscillating Frequency
Adjustment (RV503)
Input signal: Monoscope signal
1. Connect (+) side of electrolytic capacitor of 0.1 uF/100 V
to pin 1 of CN501 (or pin 1 of IC502) and (_) side to pin
3 of CN501 (or ground).
2. Connect a frequency counter to pin 10 of IC502. Adjust
RV503 (H.FREQ) so that the frequency reading
becomes the following specification.
Specification: Frequecy = 15.734 kHz ± 50 Hz
3. If the frequency counter is not available, adjust RV503
so that a horizontal-hold becomes stable.
NG
MIC
S Chassis
SECTION 5

CIRCUIT ADJUSTMENTS

RV501 RV516
RV833
RV509 RV514 RV515 RV504
RV508 RV507 RV502
D Board Adjusting Components Location
OK NG
RV831 RV832
IC831
9
4
5-1-2. Video Phase Adjustment
(RV512, RV516, RV502)
Input signal: Monoscope signal
Switches: UNDER SCAN 8 Push (ON)
16 : 9
Controls: BRIGHT
CONTR
1. Adjust RV512 (U/H.SIZE) so that the white frame of
monoscope signal is visible on the CRT screen.
2. Adjust RV516 (H.BLKG) so that the entire deflection
area is visible on the CRT screen.
3. Turn RV502 (VIDEO PHASE) and make sure that the
video phase is moving smoothly. Adjust RV502 so that
the monoscope signal comes in the center of the signal
area.
Deflection area
Signal area
A
Effective area
RV1601
RV1602 RV1603
8 Pull (4 : 3)
8 Maximum
8 Minimum
A'
A = A'
5-1