Sony XTL-W70 Service Manual page 14

XTL-W70
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RGB Decoder FO Adjustment
Procedure:
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.
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
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Connection Points and Adjustment Points: Tuner board
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VR4: RGB Decoder
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4 3
blue
TP42
TP102
TP61
TP106
TP100
TP111
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input Level Adjustment
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8
DL AMP & DAT Adjustment
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
TP111
white
Q Q
3 6 7 1 3 1 5
TP30
TP31
TP33
TP34
VR5: DL AMP & DAT Adjustment
co
VR6: RGB Decoder FO Adjustment
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9 4 2 8
2 4 3
blue
0 5 8 2 9 9 4 2 8
T1: TRAP Adjustment
T2: TRAP Adjustment
VR1: AGC Adjustment
T3: VCO Adjustment
: AFT Adjustment
m
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