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Pal Color Demodulation Adjustment (rv113, Rv2/sep101, Rv110, Rv105); Sub-sharpness Adjustment (rv205); Chroma H Pulse Adjustment (rv101, Rv102) - Sony TRINITRON PVM-8042Q Service Manual

S mic chassis color video monitor.
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5-2-10. PAL Color Demodulation Adjustment
(RV113, RV2/SEP101, RV110, RV105)
Input signal: PAL Special Color bars signal
PAL Color bars signal
Switches:
SYNC INT/EXT
LINE/RGB
1. Connect an oscilloscope to emitter of Q127.
2. Adjust RV113 (PAL HUE) so that the B-Y (0/180d)
anti-PAL signal on the R-Y demodulated signal is flat.
Q127 Emitter
3. Connect an oscilloscope to emitter of Q128.
4. Adjust RV2 on the SEP101 so that the R-Y (90/90d)
anti-PAL signal on the B-Y demodulated signal is flat.
R-Y (90/90d)
Anti-PAL signal
Q128 Emitter
5. Turn CHROMA control of the front panel maximum
clockwise, and make sure of no color is visible at the
anti-PAL signal portion on the CRT screen.
6. Input the PAL color bars signal.
7. Connect an oscilloscope to pin 30 of IC124.
8. Adjust RV110 (PAL COL) to minimize each peak level.
IC124
PIN-30
9. Connect an oscilloscope to pin 41 of IC124.
10. Adjust RV105 (PAL COL) so that the level difference
of R signal is minimum.
Specification:
Level difference of B and D = Minimum (20 mV or less)
Level difference of B and C = Minimum (60 mV or less)
A
B
IC124
PIN-41
11. After adjustment, readjust from steps 7 to 10.
MIC
S
Chassis
8 INT
8 LINE
B-Y (0/180d)
Anti-PAL signal
40 mVp-p
60 mV or less
20 mV or less
C
D

5-2-11. Sub-Sharpness Adjustment (RV205)

Input signal: Sweep signal
Bandwidth:
Burst:
Composite Sync: ON
Switches:
SYNC INT/EXT
LINE/RGB
1. Connect an oscilloscope to pin 36 of IC124.
2. Adjust RV205 (SUB SHARP) so that the 0.5 MHz and
6 MHz portions of the sweep signal is equal level (0
± 0.5 dB).
0.5 MHz
IC124 PIN-36
5-2-12. Chroma H Pulse Adjustment
(RV101, RV102)
Input signal: SECAM Color Bars signal
Switches:
SYNC INT/EXT
LINE/RGB
1. Connect an oscilloscope to pin 10 of IC106 and pin 13
of CN101.
2. Adjust RV101 (PULSE WIDTH) so that the pulse width
is shown in the following specification.
Specification: Pulse width = 6.4 ± 0.3 us
Note:
No adjustment is required for the PAL-M
model.
3. Adjust RV102 (PULSE POSI) so that the phase
difference of H sync to chroma H pulse is shown in the
following specification.
Specification: Phase difference = 0 ± 0.5 us
IC106
PIN-10
0 ±0.5 us
CN101
PIN-13
10 MHz or more (flat)
OFF
8 INT
8 LINE
6 MHz
8 INT
8 LINE
6.4 ±0.3 us
5-7

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