IBM PCjr

Error
Description
Diagnostic Action
No Printing 6. Set the printer Power switch to ON. Move
the print head to the left-most position.
Check for an Up level (approximately +5
Vdc)
to a Down level (approximately 0
Vdc) meter deflection at CN6-20 on the
driver circuit card (see Section 5,
"Locations,") while moving the print head
to the center of the print line. Use the
ground pin on the driver circuit card for
common.
Is there an Up level to a Down level meter
deflection?
YES: Go to step 7.
NO: Is there a constant Down level?
YES: Go to page 3-1400-5, "Power
Supply Check." Replace the
left margin sensor if the power
supply checks good. See
Section 4, "Removal/
Replacement and
Adjustments."
NO: Set the printer Power switch
OFF. Check continuity from
CN6-20 (driver circuit card) to
left margin sensor terminal 1
and from CN6-15 to left
margin sensor terminal 2. See
Section 5, "Locations."
Is either line open?
YES: Replace print
mechanism assembly.
See Section 4,
"Removal/ Replacement
and Adjustments."
NO: Replace left margin
sensor. See Section 4,
"Removal/ Replacement
and Adjustments."
Graphics Printer 3-1400-11