Peripherals; Check Keyboard; Check For Diagnostic Errors - NCR PC4i Service Manual

Peripherals

Remove all peripherals that may be attached to the
NCR Personal Computer, and their interface PC boards.
If necessary, reset the configuration switches on the
Main Processor Board to match the downgraded system
configuration.
The pertinent switch configurations are shown in
Chapter 8 "Strapping Information".
If the Level 0 Diagnostics now run correctly then
replace the PC boards and reconnect the peripherals
one at a time. Rerun the Level 0 Diagnostics after
replacing each PC board, and after reconnecting each
peripheral to determine which part of the system is
causing the trouble.

CHECK KEYBOARD

1. Check that the keyboard cable is properly plugged
into the 5-pin connector on the back of the MPB.
If it is, use either of the diskette-based sets of
diagnostic routines to check the keyboard.
If the keyboard is not properly plugged in, go to
Step 2.
2. Turn OFF the power as detailed in "After First
Attempt".
3. Plug the k e yb o a r d
keyboard connector on the MPB.
4. Turn ON the computer again.
CHECK FOR DIAGNOSTICS ERRORS
1. Check the display screen to see whether the power-
on d i a g n o s t i c s
indicated the presence of any memory error.
a. If no memory error message is displayed, but there
is an interrupt failure message, go to
BASIC TROUBLESHOOTING
cable conn ect or into the
r o u t i n e s have dete cted and
step 2.
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