Nakamichi PDP-42, Руководство по обслуживанию

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7
3-3 A/D Converter Level Adjustment
3-3-1. Y level adjustment
1) Connect a color bar generator (PAL or NTSC) to
the AV4 composite video input and supply a PAL or
NTSC color bar signal (1.0 Vp-p output level,
100.0.75.0 colour bars).
2) Connect an oscilloscope to TP41 then adjust VR41
so that the level between the white peak and the
pedestal point is 0.86 Vp-p as shown
.
3-3-2. R-Y level adjustment
1) Connect a color bar generator (PAL or NTSC) to
the AV4 composite video input and supply a PAL or
NTSC color bar signal (1.0 Vp-p output level,
100.0.75.0 colour bars).
2) Connect an oscilloscope to TP81 then adjust VR81
so that the waveform level is 0.66 Vp-p as shown.
3-3-3. B-Y level adjustment
1) Connect a color bar generator (PAL or NTSC) to
the AV4 composite video input and supply a PAL or
NTSC color bar signal (1.0 Vp-p output level,
100.0.75.0 colour bars).
2) Connect an oscilloscope to TP121 then adjust
VR121 so that the waveform level is 0.66 Vp-p as
shown.
VIDEO PROCESSOR / CONTROL UNIT
VR41
TP41
VR121
TP121
VR81
TP81
DIGITAL PCB
Y LEVEL ADJ
B-Y LEVEL ADJ
R-Y LEVEL ADJ
200mV, 10
µ
S
0.86V
200mV, 10
µ
S
0.66V
200mV, 10
µ
S
0.66V
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