Part 2 ~ Complete Monitor Board Alignment; Vertical And Horizontal Sync; Focus And Brightness - Control Data Corporation CDC CC63X Hardware Maintenance Manual

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Part 2 - Complete Monitor Board Alignment
This part contains the proper sequence and setup steps to adjust
all monitor board controls. These adjustments should be checked
if the bezel adapter assembly or monitor board is replaced.
Use figure 6B-16 to locate all controls referenced by the
following paragraphs.
NOTE
Allow a warm-up period of 15 to 30
minutes before performing these
adjustments.
Vertical and Horizontal Sync:
Set the V FREQ and H HOLD controls as follows.
1. Turn BRIGHTNESS (front panel) . control maximum clockwise.
\ '-.
2. Turn V FREQ control clockwise until the display starts to
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roll. Note position of control. "'-.. _
3. Turn V FREQ control counterclockwise until the display
starts to roll. Note position of control.
4. Place V FREQ control half way between position noted in
step 3 and 4.
5. Adjust potentiometer G2 on CRT monitor board for a
brightly visible raster.
6. Adjust H HOLD until the alignment pattern is horizontal
centered on the visible raster.
7. Push master reset and F8 key and verify that alignment
pattern is both. vertically and horizontally stable.
Focus and Brightness:
1. Execute the steps to display alignment ,pattern.
2. Turn BRIGHTNESS and CONTRAST (front panel) control knobs
fully clockwise.
6B-30
62940034 E