Table of Contents
Advertisement
SYMPTOM INDEX
Symptom
Note: Bad or mIssing green wire grounds on display stations or control units can cause
failures ranging from intermittent to catastrophic. Verify proper grounding by using ground
checker PN 9900453.
1. DISPLAY MALFUNCTIONS
A.
No Display:
1. No visible light or glow on CRT. (Device Check not indicated; no cursor,
characters, or indicators displayed.)
2. Glow only on CRT (Diag 3-9)
B.
Intensity and Focus:
1. One horizontal line on CRT (Diag 3-10)
. . . . . . . . . . . . . . . . .
2. Modell - Full raster on screen (Diag 3-11) OR
Model 2 - 24 rows of nine scan lines with space between each row (one row of
ten scan lines) (Diag 3-12)
. . . . . . . . . . . . . . . . . . .
3. Block displayed in every character position; cursor normal (Diag 3-14).
a. INPUT INHIBITED lighted
. . . . . . . . . . . . . . . . .
b. INPUT INHIBITED not lighted
. . . . . . . . . . . . . . .
I
4. Display too dim or too bright (No control of intensity), or dim and blurred (no
I
effect usi ng display focus control).
5. Characters out of focus (Diag 3-18)
*6. Dual-intensity problems or characters displayed that should not
7. Display erratic (e.g., display flashes, characters move, more than one cursor)
8. Screen full of lines
. . . . . . . . . . . . . .
9. Retrace unblanked
. . . . . . . . . . . . . .
10. Random data on screen. INPUT INHIBITED lighted
11. Cursor on left side in all rows . . . . . . . . .
12. One dot at character location zero cursor position
C.
Display Position and Size:
1. Horizontal size too large or too small (vertical normal) OR
Vertical size too large or too small (horizontal normal, Diag 3-8)
2. Both horizontal and vertical size too large or too small
Diagram Sheet or
Direct Action Repair
Sheet 2
Sheet 4
Sheet 4
Sheet 5
Change card J2.
Change card K2.
Sheet 5
Sheet 5
Sheet 6
Sheet 6
Sheet 6
Change cards H2, J2, K2.
Change card H 2.
Change card H2.
Change card J2.
Adjust analog card. If out
of range of adjustment,
change analog card and
card J2.
If less than 1" in either
direction, adjust analog
card. If more than 1", or
if display size erratic,
change
HV
power
supply.
3. No space between rows of characters (Model 2 only) (Diag 3-16)
. . . . . . .
Sheet 7
• Requ ires a formatted buffer.
3-2
Advertisement
Table of Contents
