IBM 5150 Hardware Maintenance Manual page 152

Error
Description
Diagnostic Action
No Printing l. Does print head carriage move back and
r
forth normally when attempting to print?
YES: Go to page 1400-20, "Row(s) of
Print Dots Missing."
NO: Go to step 2.
2. Check for a loose or broken carriage belt.
Replace if broken. Adjust if loose. (See
Section 3, "Removal/Replacement.")
3. Remove ribbon cartridge. Tum knob on
cartridge to check for jamming. Replace if
jammed. (See Section 3, "Remova1/
Replacement. ")
4. Check print head for broken wires. Replace
~
print head if wires are damaged. (See
Section 3, "Remova1/Rep1acement.")
5. Position Printer Power switch to OFF.
Move print head assembly. Check for
smooth mechanical operation.
Smooth operation?
YES: Go to step 6.
NO: Check for worn or broken gears
in
Carriage Drive assembly.
Gears worn or broken?
YES: Replace Carriage Drive
assembly. (See Section 3,
"Removal/Replacement.")
r-
NO: Replace Print Mechanism
assembly. (See Section 3,
•
"Removal/Replacement.")
1400-11