Sony TRINITRON PVM-1953MD Service Manual page 45

4. NTSC 358 R-Y LEVEL
1) Input an NTSC358 color bar.
2) Connect the oscilloscope probe to 1C404 Pin 41 or TP401.
3) Put the unit into service mode.
4) Using]R-Y LEVEL NTSC 358}, adjust so that the tops of the
waveform line up as in the diagram below. (Fig. 14)
10404 41 pin
60mV max.
20mV max.
Fig. 14
Adjust so that B=D above (20 mV max.) Check that the
difference between B and C is no greater than 60 mV.
5. PAL LINE CRAWLING
Note : Perform before PAL PHASE ADJUSTMENT.
1) Input a PAL color bar.
2) Connect the oscilloscope probe to TP402 (B-OUT)
3) Adjust the coil of CP302 so that the shaking of MAZENTA
wave form become minimum.
Do not touch the RV at this time.
Adjust to be within 2% at
the center of MAZENTA.
100%
TP402 B-OUT
a a Adjust this coil
6. PAL PHASE (NORMAL)
1) Input a PAL SP color bar.
2) Connect the oscilloscope probe to TP306.
3) Put the unit into service mode.
4) Adjust|PHASE PAL NOR|so that the B-Y anti-PAL signal
waveform is 0. (Fig. 15)
OUT. B-Y (0/180°)
anti-PAL signal
* Varies every H, although slightly, so adjust so that
the average is 0. ;
Fig. 15
7. PAL B-Y PHASE
1) Input a PAL SP color bar.
2) Connect the oscilloscope probe to TP30S.
3) Put the unit into service mode.
4) Adjust so that the B-Y anti-PAL signal
waveform is 0. (Fig. 16)
(R-Y OUT)
B-Y (90° /90°)
anti-PAL signal
t
lel
* Varies every H, although slightly, so adjust so that
Fig. 16 the average is 0.