IBM 3277 Troubleshooting Manual page 24

Display station models 1 and 2
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See Diagram 2-4 for greater detail of the test pattern data.
Diagram 3-1. Test Pattern 1, Model 1
See Diagram 2-5 for greater detail of the test pattern data.
Diagram 3-3. Test Pattern 2
Model 1 malfunction produces similar results.
(Adjust yoke, 5.2.1.4.)
Diagram 3-5. Yoke Back Too Far on CRT Neck
See Diagram 2-4 for greater detail of the test pattern data.
Diagram 3-2. Test Pattern 1, Model 2
See Diagram 2-6 for greater detail of the test pattern data.
Diagram 3-4. Test Pattern 3
Model 1 malfunction produces similar results.
(Adjust yoke, 5.2.1.4.)
Diagram 3-6. Yoke Tilted
Symptom Index
3-7

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