IBM PCjr

Error
Description Diagnostic Action
No Printing 7. Check for a meter deflection from an Up
level (approximately +5 Vdc) to a Down
level (approximately 0 Vdc) on pin CN6-19
on the driver circuit card (see Section 5,
"Locations,") while applying slight left or
right pressure to the print head without
advancing the print head to the next
detented position. Use the driver circuit
card ground pin for common.
Is there an Up level to a Down level meter
deflection?
YES: Go to step 8.
NO: Is there a constant Up level?
YES: Replace print mechanism
assembly. See Section 4,
"Removal/ Replacement and
Adjustments."
NO: Check for +5 Vdc at CN5-18.
See Section 5, "Locations."
Is there +5 Vdc?
YES: Replace print
mechanism assembly.
See Section 4,
"Removal/Replacement
and Adjustments."
NO: Go to page 3-1400-5,
"Power Supply Check."
3-1400-12 Graphics Printer