IBM PCjr

Error
Description
Forms Do
Not Advance
Overprinting
Forms
Jamming or
Tearing
Diagnostic Action
8. Check for damaged platen. Replace print
mechanism assembly if platen is damaged.
See Section 4, "Removal/Replacement and
Adjustments."
9. Set printer Power switch to OFF. Advance
forms by turning forms advance knob.
Check intermediate gear for worn or broken
teeth and replace gears if damaged. Check
left and right tractors for broken feedpins
and replace if broken. See Section 4,
"Removal/Replacement and Adjustments."
10. Check for 45 ohms resistance on forms feed
motor coils between pin CN6-14 and pins
CN6-25, 26, 27 and 28 on driver circuit
card. See Section 5, "Locations."
Does the resistance = 45 ohms?
YES: Check for +24 Vdc at CN3-18. See
Section 5, "Locations."
Is there +24 Vdc?
YES: Replace both control cards.
See Section 4, "Removal/
Replacement and
Adjustments."
NO: See page 3-1400-5, "Power
Supply Check."
NO: Replace print mechanism assembly.
See Section 4, "Removal/
Replacement and Adjustments."
Graphics Printer 3-1400-15