IBM 5150 Hardware Maintenance Manual page 146

Failure Symptom
Power Supply
Print Head
r
No Printing
Print head carriage not moving
Forms
Forms not advancing; overprinting
Forms jamming or tearing
Ribbon
Ribbon jammed
Print Quality
Printing too light; poor print quality
Smudged printing
Uneven printing (characters or lines)
Row(s) of print dots missing
."..-..
Random print dots missing
Extra print dots
Printing continues beyond end-of-forms
Doublespacing - abnormal characters
False end-ot-forms alarm
Uneven horizontal spacing
Control Panel
,,-....
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