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10-1-3.
Note on Adjustments
The video block adjustment can be made without the camera
block except "Battery Down Adjustment" of system control
adjustment and "Switching position adjustment" of servo system
adjustment. Remove the following three connectors in case of
removing the camera block.
1, 2 PIN connector on CAMERA DC/DC convertor.
2. CN307 (4-pin) on VC-95 board
3. CN305 (12-pin) on VC-95 board
The cabinet (L) is not required for the video block adjustment.
When removing the cabinet (L), remove the following connector.
1. CN601 (8-pin) on VA-68 board.
2. CN401 (6-pin) on VA-68 board.
3. CN503 (6-pin) on SS-136 board.
The cabinet (R) is not required for the video block adjustment.
When removing the cabinet (R), remove the following connector.
1. CNSO1 (14-pin) on VK-16 board,
There is no problem even if the CT-39 board is removed when
adjusting the video circuit.
However, when adjusting the CT-39
board (digital titler/character generator circuit), use the extension
cord (20-pin).
10-1-4,
Set-up for Adjustment
Since the video signal obtained from the pattern generator is used
as the adjusting signal for the electrical adjustment, this video
output signal should meet the required specifications. Connect an
oscilloscope to the VIDEO IN/OUT terminal of the VA-68 board
and make sure that the amplitude of the video SYNC signal is
approximately 0.3V, that the amplitude of the video image is
approximately
0,7V,
that
the
burst
signal
amplitude
is
approximately 0.3V with flat characteristics, and that the signal
level ratio between the burst signal and "Red" signal is 0.30:0.66,
The video signal (color bars) used for VIR block electrical
adjustment are shown in Fig. 10-2.
White (approx. 100%)
Approx.
0.7V
Approx.
0.3V
Burst signal
Horizontal SYNC sigan!
(to be flat)
Fig. 10-2.
Color bar signal of pattern generator
— 285 —
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