HP 300 Service Information Manual

General Description of Failure CodesTable 5-4 shows the general meaning of error codes. These codes are explained further in othertables. LED patterns are represented by a black dot for on and a white dot for off. Letterdesignators indicate the LED in that position is on or off, depending on the binary code used torepresent the device or failure type.Table 5-4. General LED Code Failure IndicationsLED PatternFailure Indications, via Upper Two Bits General Description of FailureState Indication Only:Required Device Missing orDTACK Failure:Failing Device:Special Codes (Special Case HighestPriority Codes):State or Device Codes, Via Lower 6 BitsMiscellaneous (Highest Priority):Internal Peripheral Failure (MediumPriority):I/O Card Failure (Lowest Priority):State and Failure Codes00 SS SSSSWhere SS SSSS Indicates State of Power-upO. DD DDDDWhere DD DDDD Indicates Device.0 DD DDDDWhere DD DDDD Indicates Device••••••••LEDs Never Accessed (or Unused Code)0 •••••••LEDs Failed to DTACK00000.0.Timer on processor board has failed or is missing.xx 00 FFFFWhere FFFF indicates Failure (Xs are don't-carebits)XX O. PPPPWhere PPPP is Peripheral NumberXX • S SSSSWhere S SSSS is Select CodeTable 5-5a is a list of all LED failure codes used in the HP 98561 Boot ROM. Codes are listedhere in numerical order for easy reference, and then again in order of occurrence and priority.116 TroubleshootingArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com