HP 9000 Series 310 Service Information Manual page 126

General Description of Failure Codes
Table 5-4 shows the general meaning of error codes. These codes are explained further in other
tables. LED patterns are represented by a black dot for on and a white dot for off. Letter
designators indicate the LED in that position is on or off, depending on the binary code used to
represent the device or failure type.
Table 5-4. General LED Code Failure Indications
LED Pattern
Failure Indications, via Upper Two Bits General Description of Failure
State Indication Only:
Required Device Missing or
DTACK Failure:
Failing Device:
Special Codes (Special Case Highest
Priority Codes):
State or Device Codes, Via Lower 6 Bits
Miscellaneous (Highest Priority):
Internal Peripheral Failure (Medium
Priority):
I/O Card Failure (Lowest Priority):
State and Failure Codes
00
SS SSSS
Where SS SSSS Indicates State of Power-up
O.
DD DDDD
Where DD DDDD Indicates Device
.0
DD DDDD
Where DD DDDD Indicates Device
••••••••
LEDs Never Accessed (or Unused Code)
0 • • • • • • •
LEDs Failed to DTACK
0 0 0 0 0 . 0 .
Timer on processor board has failed or is missing.
xx
00
FFFF
Where FFFF indicates Failure (Xs are don't-care
bits)
XX
O.
PPPP
Where PPPP is Peripheral Number
XX • S SSSS
Where S SSSS is Select Code
Table 5-5a is a list of all LED failure codes used in the HP 98561 Boot ROM. Codes are listed
here in numerical order for easy reference, and then again in order of occurrence and priority.
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Troubleshooting