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INTRODUCTION
I-E96-107-2N
6 - 1
SECTION 6 - TROUBLESHOOTING
INTRODUCTION
This section explains troubleshooting and testing IIOIS12 and
IIOIC12 components. It includes reference tables, component
tests and firmware tests. Replace components by following the
step-by-step procedures in
.
Be sure to follow all warnings, cautions and notes. Put boards
containing MOS devices into antistatic bags when stored or
shipped back to the factory. Do not repair printed circuit
boards in the field. All repairs and adjustments should be per-
formed by qualified personnel.
TROUBLESHOOTING
The console arrives ready for operation. After completing the
instructions given in
, prepare the unit for service.
The troubleshooting guide in Table
will help identify some
of the more common problems and suggest solutions.
Table 6-1. Troubleshooting Guide
Symptom
Possible Problem or Solution
No power indicator on circuit
No AC power at IIOIS12.
Check AC wiring on input.
Check AC on power entry panel.
Check breaker light on power entry panel.
Check power on indicator.
Breaker off but indicator on
Check breaker contacts.
Check breaker wiring.
Check AC input wiring.
Check power switch on system unit.
No disk I/O
Check cable from hard disk to controller card (OIS12 only).
Check that 3.5 inch disk drive latch is open and no disk is in the drive.
Improper/ incomplete start-up
See diagnostic message at start-up for possible problems.
Start-up OK but no NIU
response (OIS12 only)
Check NIU cables. Diagnostics disabled, (port A at 19.2 Kbyte).
Check PC set up options to disable COM 2 port.
Try using NIU diagnostic port to test IIMCL01/IIMLM01/IIMCP0_ modules.
Check configuration of NIU enabled.
Check for duplicate node settings on the loop.
Start-up OK but no keyboard
response
Check serial card and jumpers.
Check all cables.
Check caps lock position.
Check console configuration; printers and mylar keyboard enabled.
Check keyboard assignment.
Start-up OK but no CRT picture Check CRT AC power.
Check CRT fuse.
Check cables.
Check graphics card.