IBM 5150 Hardware Maintenance Manual page 156

Error
Description
Diagnostic Action
Forms Do
1. Check position of forms feeding into
.,,-...,
Not Advance
printer. Forms path must be parallel to
printer sides. Reposition forms for parallel
Overprin ting feeding.
Forms
2.
Check forms path for any obstructions (for
Jamming or
example, jagged edges on forms box, tom
Tearing
paper in Print Mechanism). Remove any
obstructions.
3. Inspect left and right forms tractors.
-
Poor positioning
-
Loose covers
-
Loose lock levers
-
Worn springs
-
Broken feed pins
Replace left or right forms tractors if
~
damaged. (See Section 3, "Removal/
Replacement. ")
4. Inspect print head for broken wires. Replace
if wires damaged. (See Section 3,
"Removal/Replacement.")
5. Check print head gap adjustment. Adjust
if out of tolerance. (See Section 3,
"Removal/Replacement.")
6.
Check for bent or pitted ribbon shield.
Replace shield if damaged. (See Section 3,
"Removal/Replacemen
1.")
.
~
7. Check for damaged platen. Replace Print
Mechanism assembly if platen is damaged.
•
(See Section 3, "Removal/Replacement.")
1400-15