IBM 6400 series Maintenance Manual page 68

Printer does not complete IML
Printer does not detect presence of power
stacker
Stacker chatters at upper or lower limit
Stacker does not stack properly
Stacker elevator does not move
Stacker elevator moves by itself
Stacker limit switch check
Stacker motor check
Stacker not operating
Characters or dots are missing, smeared, too
light, or too dark
Horizontal misalignment of characters (Dots
or characters move left or right from dot row
to dot row or line to line)
Randomly misplaced dots
Vertical misalignment of characters:
1. Dots or characters move up or down from
dot row to dot row or line to line
2. Incorrect spacing from dot row to dot row
or line to line
3. Characters randomly compressed and/or
enlarged
Downloads consistently fail
Flash SIMM won't copy
Paper feeds poorly
Printer does not print self tests
68
Symptom
Power Stacker
Print Quality
Printer Operation
Troubleshooting
Procedure
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Troubleshooting