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Model
1
Top Margin:
Adjust Top Margin potentiometer so
that top trace of first character row falls within line A
marked on alignment mask.
Model
1
Character Height:
Adjust Character Height poten-
tiometer so that bottom trace of characters in last row falls
within line 0 of alignment mask. When adjusted correctly,
overall height of display image should
be
3.9 inches.
Model
1
Linearity:
After completing the yoke, centering
ring, and analog card adjustments, check that 20th and 21 st
characters on sixth and seventh rows fall within rectangle
H
at center of alignment mask. Test Pattern 2 provides
characters in these four locations. Recheck preceding
adjustments if this specification is not met.
5.2.1.7
Model
2
Analog Card Adjustments
The procedures described in the foil owing paragraphs apply
to Model 2 display stations only. (See paragraph 5.2.1.6 for
the Model 1 analog card adjustment procedures.) The
following procedures require that the Model 2 alignment
mask (PN 2565170)
be
in place at the face of the CRT and
Test Pattern 3 be displayed.
Model
2
Horizontal
Width:
The vertical deflection
grounding jumper (connected in step 2 of paragraph
5.2.1.4) should remain attached during this adjustment.
Proceed as follows:
1. Adjust Horizontal Width potentiometer so that ends of
horizontal trace on screen coincide with lines E and G
on alignment mask. When adjusted correctly, trace
should be 10.5 inches.
2. Check to make sure that horizontal trace still passes
through geometric center of CRT (line 0). Readjust
centering rings as described in paragraph 5.2.1.5 if it is
necessary to move trace back through center of CRT.
3. Remove vertical deflection grounding jumper.
Model 2 Top Margin:
1. Connect a jumper between logic board pin A lJ2M03
and ground (any 008 pin). This jumper disables vertical
skip circuit, causing i:1ter-row spacing to disappear and
display image to gather toward top of screen.
2. Adjust Top Margin potentiometer so that top trace of
first character row falls within center of line A (marked
on alignment mask).
Model 2 Character Height:
1. Leave vertical skip disabling jumper attached for this
adjustment.
2. Adjust Character
Hei~t
potentiometer so that bottom
trace of characters in last row coincides with center of
line C on alignment mask. When adjusted correctly,
overall height of display image should be 3.3 inches from
line A to line C.
5-8
3. Remove vertical skip disabling jumper. Display image
should appear nearly normal, with inter-row spacing.
Overall image may
be
too large or too small.
Model 2 Inter-Row Spacing:
Adjust Row Spacing poten-
tiometer so that bottom trace of characters in last row falls
within line F on alignment mask. When adjusted correctly,
overall height of image should be approximately 8.0 inches
from line B to line F.
Model 2 Linearity:
After completing yoke, centering ring,
and analog card adjustments, check that 40th and 41st
characters on 12th and 13th rows fall within rectangle M on
alignment mask. Test Pattern 3 provides characters in these
four locations. Recheck preceding adjustments if this
specification is not met.
5.2.2 -12V Regulator Card
This adjustment should
be
performed when the -12V
regulator card is replaced or when a voltage check shows
that -12V is not at Its nominal value. Voltage measurements
are made on TB 1. TB 1 is located on the right side frame in
Model 1 display stations and is under the left side of the
CRT in Model 2 display stations.
1. Set volt-ohmmeter selector switch to a position that will
accurately measure 12V dc.
2. Attach meter plus
(+)
lead to a dc return (-) terminal on
TB1.
3. Attach meter minus (-) lead to the -12V terminal on
TB1.
4. Adjust potentiometer on -12V regulator card. Use a
small screwdriver. Set potentiometer so voltmeter shows
12V.
5. Remove meter leads from TB 1.
5.2.3 OFF-PUSH Switch (Model 2 Only)
This adjustment should be made after replacing the prime
power box or switch actuator mechanism. Ensure that the
upper chassis is seated properly on the lower chassis, the
chassis clamps are latched, and power is removed before
proceeding. Use Diagram 5-1 to locate the components
specified in this adjustment.
1. Loosen the following components:
a.
Front control cable clamp.
b.
Rear control cable clamp.
c.
Control wire setscrew.
d.
Actuator bracket mounting screw.
2. Position control assembly flush with the rear edge of
rear control cable clamp.
3. Tighten rear control cable clamp.
4. Adjust actuator mounting bracket (front to rear) to
center actuator over power switch plungers.
5. Tighten actuator mounting bracket.
6. Tighten front control cable clamp.
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