IBM 3277 Troubleshooting Manual page 27

Display station models 1 and 2
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Model 1 malfunction produces similar results.
The density of the superimposed characters is
determined bv the number of characters in the row.
Diagram 3-19. Yoke Horizontal Return Line Open
t
Model 1 malfunction produces similar results.
Diagram 3-21. 1/2 Vertical Yoke Open
t
Model 1 malfunction produces similar results.
The pattern displayed is data dependent.
Diagram 3-23. Vertical Yoke Open
t
3-10
Model 1 malfunction produces similar results.
Diagram 3-20. Open in Yoke Horizontal Winding
t
Model 1 malfunction produces similar results.
The vertical bar appears in every row that has data.
Diagram 3-22. Horizontal Yoke Open
t
t
Connector P1 loose on analog card can cause similar symptom.
Check P1 before changing yoke. change analog card if connector
and / or yoke do not repair the problem.

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