IBM PCjr Hardware Maintenance And Service page 218

1. Set the system unit's Power switch to Off.
2. Set the graphics printer's POWER switch to OFF.
3. Remove the parallel printer attachment and set it
aside. Make a note that this is parallel printer
attachment #1.
4. Attach a new parallel printer attachment. Make a
note that this is parallel printer attachment #2.
5. Repeat the graphics printer advanced test (ID "A").
DO YOU HAVE "4300" UNDER THE GRAPHICS
PRINTER SYMBOL?
The problem has been corrected. Repeat
advanced POST and the advanced tests to
ensure that the IBM VCjr is operating
correctly.
Reattach the original parallel printer
attachment.
Go to the PIC "Graphics Printer" on page
3-1400-1.
3-900-10 Parallel Printer Attachment