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General Failure Indications
Table 4-1. Self-Test LED General Failure Indications
Upper 2 Bits Fail Indicator LED Code and Failure Description
State Indication Only:
ooSS SSSS
Where SS SSSS Indicates State of Power-up
Required Device Missing or
o.DD DDDD
DTACK Failure:
Where DD DDDD Indicates Device
Failing Device:
.0DD DDDD
Where DD DDDD Indicates Device
Special Codes
••••••••
(Special Case Highest Priority LEDs Never Accessed (or Unused Code)
Codes):
0 • • • • • • •
LEDs Failed to DTACK
0000 000.
Timer on processor board has failed or is
missing.
Lower 2 Bits State or Device LED Code and Failure Description
Codes
Miscellaneous (Highest Priority): XXoo FFFF
Where FFFF indicates Failure (Xs are
don't-care bits)
Internal Peripheral Failure
XXo. PPPP
(Medium Priority):
Where PPPP is Peripheral Number
I/O Card Failure
XX.S SSSS
(Lowest Priority):
Where S SSSS is Select Code
Thoubleshooting
29
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Troubleshooting
