Sony XTL-750W Service Manual page 13

RGB Decoder FO Adjustment
Procedure:
Hong Kong model:
1. Without INPUT1, INPUT2 inputs (no signal input mode), short
the jumper wire between TP100 and GND.
2. Connect a frequency counter to TP61.
3. Adjust VR6 so that reading on frequency counter is
4.433619 MHz ± 10 Hz.
4. Short the jumper wire between TP106 and GND.
5. Connect a frequency counter to TP61.
6. Confirm that reading on frequency counter is 3.579545 MHz ±
100 Hz.
7. After this adjustment, remove the jumper wires.
US model:
1. Without INPUT1, INPUT2 inputs (no signal input mode), short
the jumper wire between TP100 and GND.
2. Connect a frequency counter to TP61.
3. Adjust VR6 so that reading on frequency counter is
3.579545 MHz ± 100 Hz.
4. After this adjustment, remove the jumper wires.
RGB Decoder Input Level Adjustment
Procedure:
1. Input signal : PAL EBU color bar (INPUT 1 VIDEO)
2. Adjust VR4 so that the white peak 1 (100% white) of
TP111 (B OUT) is at 1.0 Vp-p.
SYNC
1 2
TP111
white
DL AMP & DAT Adjustment (Hong Kong model)
Procedure:
1. Adjust DAT so as to minimize the variation between the level
2 and the level 3 of TP111.
2. Adjust VR5 so that the blue level 4 is at 1.0 Vp-p.
3. Set the input to NTSC, and confirm that the blue level 4 is at
1.0 ± 0.1 Vp-p.
SYNC
1 2
TP111
white
4 3
blue
4 3
blue
– 13 –