IBM RT PC 10 Hardware Maintenance And Service page 145

Invalid Display Data PIC 9850
Step 1
1. Do the "Top Cover Removal" on page 4-12.
2. Remove the adapters from slots 1 thru 5, except the display adapter, and
record the type and slot position of each.
3. Plug the external power cable into the outlet.
4. Insert the Diagnostics 1 (DIAG-l) diskette in the diskette drive.
5. Set the power switch on the system unit to On.
6. Turn the Brightness control clockwise.
7. Wait four minutes, then answer the following question.
DIAGNOSTIC OPERATING INSTRUCTIONS DIAG-l
This diskette contains diagnostics and utilities for your system. You
should use these procedures whenever you are having problems with your system
whi ch have not been corrected by any software appl i cati on procedures avail ab1e.
In general, the procedures will run automatically. However, sometimes you will
be required to select options, tell the system when to continue, do simple
tasks, and exchange di skettes.
ARE THE "DIAGNOSTIC OPERATING INSTRUCTIONS" DISPLAYED
CORRECTLY?
YES Go to "Step 3" on page 3-102.
NO Continue on the next page.
3-100 Service Manual