IBM PCjr Hardware Maintenance And Service page 240

Error
Description
Diagnostic Action
No Printing 1. Does print head carriage move back and
forth normally when attempting to print?
YES: Go to page 3-1400-19, "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 4, "Removal/Replacement and
Adjustments."
3. Remove ribbon cartridge. Turn knob on
cartridge to check for jamming. Replace if
jammed. See Section 4, "Removal/
Replacement and Adjustments."
4. Check print head for broken wires. Replace
print head if wires are damaged. See
Section 4, "Removal/ Replacement and
Adjustments."
5. Set printer Power switch to OFF. Move
print head assembly and check for smooth
mechanical operation.
Is there smooth operation?
YES: Go to step 6.
NO: Check for worn or broken gears in
Carriage Drive assembly.
Are any gears worn or broken?
YES: Replace carriage drive
assembly. See Section 4,
"Removal/Replacement and
Adjustments."
NO: Replace print mechanism
assembly. See Section 4,
"Removal/Replacement and
Adjustments."
3-1400-10 Graphics Printer