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PA-RISC LED codes

• Overview
• 712 LED Codes
• 715/{33,50,75} LED Codes
• 715/{64,80,100} LED Codes
• 720/730/750 LED Codes
• 735/755 LED Codes
• B-Class LED Codes
• C-Class LED Codes
• K-Class LED Codes

Overview

Most PA-RISC computers have some LEDs on the system’s front-panel. If an error occurs during the power-up diagnostic tests, the PDC uses the front panel LEDs to display a code for the failing component(s).

705/710, 715/{33,50,75}, 715/{64,80,100} and 725 have 9 LEDs on the front-panel:

A = Amber, G = Green.

705/710, 715 and 725 LED panel

8	7	6	5	4	3	2	1	0
A	A	A	A	A	A	A	A	G

0 is the Power LED, it indicates that the system is powered up. 4 is the heartbeat; if the system is running, it flashes periodically to indicate that the system is still alive.

Similarily, 720/730/750 and 735/755 have 10 LEDs (Illustration):

720, 730, 735, 750 and 750 LED panel

9	8	7	6	5	4	3	2	1	0
G	A	A	A	A	A	A	A	A	G

The only difference is LED no. 9, the Service LED, indicating whether the machine was booted in Service mode. On 755 these LEDs are arrangend from top to bottom, starting with LED 0, the Power LED.

Newer machines like e.g. B-Class or C-Class only have 5 LEDs: one Power LED and four System LEDs.

↑ up

712

The 712 only has two error-messages that are displayed on the LED above the power button:

1. 3/4-second flash pattern: CPU board is defective
2. Three quick flashes, pause, three quick flashes-pattern: graphics hardware problem

↑ up

715 (Scorpio)

Taken from the Model 715 Owner’s Guide, these codes apply to 715/{33,50,75} they should be applicable to other 700.

# means LED is on or flashing, / means LED is either on or off.

715 Scorpio LED codes

8 7 6 5 4 3 2 1	Error Message	Solution
_ _ _ # / / / /	CPU/FPU error	probably replace mainboard/CPU
_ _ # _ / / / /	"	"
_ _ # # / / / /	CPU/Motherboard error	"
_ # _ _ / / / /	CPU/FPU error	"
_ # _ _ # _ _ #	FPU-test failure	If it doesn't disappear, power down the system & reboot. If unsuccessful, replace cpu-card
_ # _ _ # _ # _	"	"
_ # _ _ # _ # /	"	"
_ # _ # _ _ _ #	EISA-interface error	Remove all EISA-cards, remove EISA-backplane etc. Clean, and reinstall in the system. If error still appears one of former is broken and to be removed.
_ # _ # _ _ # _	"	"
_ # _ # _ _ # #	"	"
_ # _ # _ # _ _	"	"
_ # _ # _ # _ #	"	"
_ # _ # # # # #	PDC ROM checksum error	?
_ # # _ _ # # #	Memory pair 0, Slot B error	Pull out module in question, clean, reseat. If error still appears memory-module is broken.
_ # # _ _ # # _	Memory pair 0, Slot A error	"
_ # # _ _ # _ #	Memory pair 1, Slot B error	"
_ # # _ _ # _ _	Memory pair 1, Slot A error	"
_ # # _ _ _ # #	Memory pair 2, Slot B error	"
_ # # _ _ _ # _	Memory pair 2, Slot A error	"
_ # # _ _ _ _ #	Memory pair 3, Slot B error	"
_ # # _ _ _ _ _	Memory pair 3, Slot A error	"
_ # # # # # _ #	No memory found	Better start machine with some memore
# _ _ _ _ _ _ _	Unknown I/O device	Pull out all unneccessary devices and reboot
# _ _ _ _ _ _ #	Error while trying to boot from SCSI device	Check SCSI-bus for cabling and termination errors, check drives
_ # _ _ _ _ _ #	Error while trying to boot from LAN	Check cabling
# _ _ _ _ _ _ #	Error trying to access Console Keyboard	Check HIL-cabling polarity, try different keyboard
# _ _ _ _ # _ _	Error while trying to access Console Device on COM1	Check cable and terminal [settings]
# _ _ _ _ # _ #	Error while trying to access Console Device on COM2	Check cable and terminal [settings]
# _ _ _ _ # # _	Error while trying to access Parallel port	Bad luck
# _ _ _ _ # # #	Error on SGC Slot 1 (built-in Gfx)	Remove card, clean, reseat, maybe try another one
# _ _ _ # _ _ #	Unable to initialize EISA slot	Remove EISA card, backplane, clean both, reseat
# _ # # _ _ _ #	Error reading from Stable Storage/EEPROM	Switch off, pull cord. Re-plug, and restart
# _ # # _ _ # _	Unexepected interrupt during PDC execution	Same as above
# _ # # _ _ # #	No working console found	Attach one
# _ # # _ # _ _	HPMC handling initiated	?
# _ # # _ # _ #	HPMC due to cache error	Switch off and reboot, if problem persists the cache is probably defect. Get new CPU or motherboard
# _ # # _ # # _	HPMC due to memory error.	Switch off and reboot. Reseat/replace memory boards.
# _ # # _ # # #	HPMC due to bus error.	Switch off and reboot, if problem persists a core component is probably defect. Get new CPU or motherboard
# _ # # # _ _ _	Nested HPMC occured.	Switch off and reboot. (very bad)
# _ # # # _ _ #	Error while writing to EEPROM.	?
# _ # # # _ # _	Unable to determine valid Processor Speed.	?
# _ # # # _ # #	ROM Checksum error.	?
# _ # # # # _ #	Illegal Processor Speed/Clock Ratio sensing.	?
# _ # # # # # #	Bad Memory Hardware.	?

↑ up

715 (Mirage)

Taken from the Model 715 Owner’s Guide, these codes apply to 715/{64,80,100} they should be applicable to other 700s.

# means LED is on or flashing, / means LED is either on or off.

715 Mirage LED codes

8	7	6	5	4	3	2	1	Error Message	Solution
	#						#	CPU Error	?
		#				#	#	Fatal Error	?
		#					#	RAM Test Error	?
	#					#		Cache Error	?
	#				#			FP Coprocessor Error	?
		#			#			Fatal Coprocessor Error	?
	#			#				I/O Device Error	?
	#					#	#	ROM Checksum Error	?
		#		#	#			HPMC Error	Switch Machine off, reboot. Could indicate failure of a core component
		#				#		HPMC due to Cache Error	Switch Machine off, reboot. Indicates drastic failure in cache subsystem. If possible, replace cache/CPU module
		#			#		#	HPMC due to Bus Error	Switch Machine off, reboot.
		#			#	#	#	HPMC due to Memory Error	Switch Machine off, take the RAM out. Figure out, which module is broken.
	#	#		#			#	Console Initialization Error	Look if keyboard/serial console cable is attached properly.
		#		#		#		No working console found.	"
	#	#		#		#		No bootable device found.	Install one, check PATHs
	#	#			#	#		InitializationError	?

↑ up

720/730/750 (Snakes)

Taken from the Owner’s Guide. Illustration of the LED panel.

# means LED is on or flashing, / means LED is either on or off

720, 730 and 750 LED codes

8	7	6	5	4	3	2	1	Error Message	Solution
			#	/	/	/	/	CPU Error	Replace processor board
		#		/	/	/	/	CPU Error	Replace processor board
		#	#	/	/	/	/	CPU Error	Replace processor board
	#			/	/	/	/	CPU Error	Replace processor board
	#	#						RAM Error	Replace SIMM card in slot A1
	#	#					#	RAM Error	Replace SIMM card in slot A2
	#	#				#		RAM Error	Replace SIMM card in slot B1
	#	#				#	#	RAM Error	Replace SIMM card in slot B2
	#	#			#			RAM Error	Replace SIMM card in slot C1
	#	#			#		#	RAM Error	Replace SIMM card in slot C2
	#	#			#	#		RAM Error	Replace SIMM card in slot D1
	#	#			#	#	#	RAM Error	Replace SIMM card in slot D2
#		#	#			#		I/O Error	Replace I/O Card
#		#	#		#		#	CPU Error	Replace processor board
#		#	#		#	#		Error	Replace processor board or on SIMM
#		#	#		#	#	#	Error	Replace processor board or I/O card
#		#	#	#			/	Error	Replace processor board or I/O card

↑ up

735/755

Taken from the Service manual and supplied by Greg Fruth, thanks! Illustration of the LED panel.

# means LED is on or flashing, - means LED is off.

The codes mean different things depending on what state the machine is in. There are codes for the Selftest, the PDC (Processor Dependent Code), the ISL (Initial System Loader) and HP-UX (that’s the order in which they run).

###############################################################################
Selftest LED Codes
###############################################################################
 LED #
87654321	FRU		Error
===============================================================================

---#---#	Processor	CPU Diagnose Register
		Board
---#--#-			CPU Basic Functions

---#--##			CPU ALU & Branch

---#-#--			CPU Arithmetic Conditions

---#-#-#			CPU Bit Operations

---#-##-			CPU Arithmetic Side Effects

---#-###			CPU Control Registcrs

---##---			CPU External Interrupts

---##--#			CPU Shadow Registers

---##-##			TLB Initialization

--#----#			Cache Data Line

--#---#-			Cache Address Line

--#---##			Instruction Cache RAM

--#--#--			Data Cache RAM

--#--#-#			Cache Tag Compare

--#--##-			Cache Errors

--#--###			Cache Configuration

--#-#---			Cache Flush

--#-#--#			Cache Byte Transaction

--#-#-#-			Instruction Cache Miss

--#-#-##			Data Cache Miss

--#-##--			Cache Done

--##---#			Memory Interface EIR

--##--#-			Memory Interface HPMC

--##--##			Memory Interface

--##-#--			Memory Interface Invalid Address

--##-#-#			Memory Interface Single Bit Error

--##-##-			Memory Interface Double Bit Error

--##-###			Memory Interface Diagnose Register

-#-----#			Floating Point Registers

-#----#-			Floating Point Instructions

-#----##			Floating point Traps

-#-#---#	EISA		EISA Init
		Interface
		Controller
-#-#--#-			EISA ADDR Test

-#-#--##			ADDR Test Failure

-#-#-#--			EISA Pattern Test

-#-#-#-#			EISA Pattern Test Failure

-#-#####			RAM CHECKSUM Failure

-##-----	Memory		RAM Slot 5B (J100) Error

-##----#			RAM Slot 4B (J102) Error

-##---#-			RAM Slot 3B (J104) Error

-##---##			RAM Slot 2B (J106) Error

-##--#--			RAM Slot 1B (J108) Error

-##--#-#			RAM Slot 0B (J110) Error

-###----			RAM Slot 5A (J101) Error

-###---#			RAM Slot 4A (J103) Error

-###--#-			RAM Slot 3A (J105) Error

-###--##			RAM Slot 2A (J107) Error

-###-#--			RAM Slot 1A (J109) Error

-###-#-#			RAM Slot 0A (Jlll) Error

-###-###			RAM Configuration & Test In Progress

-#####-#			No RAM Found

-######-			Non-Destructive RAM Test

-#######			RAM Configuration & Test

#-------	Processor	Unknown I/O Device
		Board
#------#			Single-Ended SCSI Init

#-----#-			LAN Init

#-----##			HIL Init

#----#--			RS232 Port A Init

#----#-#			RS232 Port B Init

#----##-			Parallel Port Init

#---#---	SGC Slot 0	Graphics Init

#---#--#	EISA Card	EISA Slot Init

#--##---	FDDI Slider	FDDI Init
		Board
#--##--#	Processor	Fast Wide SCSI Init
		Board


###############################################################################
PDC LED Codes
###############################################################################
 LED #
87654321	Status
===============================================================================

#-#----#	Destructive Memory Init

#-#---#-	Non-Destructive Memory Init

#-#---##	Console Selection

#-#--#--	Boot Device Selection

#-#--#-#	Autoselection Failure to Find Boot Device

#-#--##-	Launching IPL

#-#--###	TOC Handler Entered

#-#-#---	Branching to OS TOC Handler

#-#-#--#	Branching to OS HPMC Handler

#-#-#-#-	EISA Subsystem Init

#-#-#-##	Setting Up Default EISA Config

#-#-##-#	At Least One Selftest Failed (Service Mode)

#-##---#	Error Reading EEPROM

#-##--#-	Unexpected Interrupt

#-##--##	No Console Located

#-##-#--	HPMC Handling Init

#-##-#-#	HPMC Due to Cache Error

#-##-##-	HPMC Due to Memory Error

#-##-###	HPMC Due to Bus Error

#-###---	Nested HPMC Detected

#-###--#	Error Writing EEPROM

#-###-#-	Unable to Determine Valid Processor Speed

#-####--	Processor Speed Sensing

#-####-#	Problem Calculating Memory Control Values

#-######	Bad Memory Hardware


###############################################################################
ISL LED Codes
###############################################################################
 LED #
87654321	Status
===============================================================================

--------	ISL Executing.

-------#	ISL is Autobooting from the Autoexec file.

------#-	ISL Cannot Find Autoexecute file.

------##	No Console Found. ISL Autobooting.

-----#-#	Directory of utilities is too large.

-----##-	Autoexec File is Inconsistent.

---#--#-	Error Reading Autoexec File.

---#--##	Error Reading from Console.

---#-#--	Error Writing to Console.

---#-#-#	Not an ISL Command or Utility.

---#-##-	Utility File Header Inconsistent: Invalid System ID.

---#-###	Error Reading Utility File Header.

---##---	Utility Flle Header Inconsistent: Bad Magic Number.

---##--#	Utility Would Overlay ISL in Memory.

---##-#-	Utility Requires More Memory Than Is Configured.

---##-##	Error Reading Utility Into Memory.

---###--	Incorrect Checksum: Reading Utiliy Into Memory.

---###-#	System Console Needed.

---####-	Internal Inconsistency: Invalid Boot Device Class.

--#----#	Destination Memory Address of Utility is Invalid.

--#---#-	Internal Inconsistency pdc_cache entry

--#---##	Internal Inconsistency: IODC ENTRY_INIT

--#--#--	Internal Inconsistency: IODC ENTRY_INIT Console

--#--#-#	Internal Inconsistency: IODC ENTRY_INIT Boot Device

--#--##-	Utility File Header Inconsistent: Bad aux_id

--#--###	Bad Utility File Type


###############################################################################
HP-UX Kernel LED Codes
###############################################################################
 LED #
87654321	Status
===============================================================================

###-----	Kernel Loaded and Initialization Begun.

####---#	Kernel Has Entered main().

####--#-	Kernel Is About to Configure I/O System.

####-#--	Kernel Is About to Mount Root File System.

####-##-	Kernel Is About to Set Up Page-Out Daemon.

#####---	Kernel is About to Start the "INIT" Process.

--------	Shutdown In Process.

-----#--	TOC Dump.

---#----	HPMC Dump.

--#----#	Operating System Executing with Load
		Indicator X.

Once the machine is into HP-UX, the top 4 amber LEDs (1-4) assume the meanings given by the hieroglyphics next to the LEDs themselves (i.e. net transmit, net receive, SCSI, heartbeep). The bottom 4 LEDs (5-8) give the system load factor (as reported by "uptime", "w", etc.)

↑ up

B-Class

Taken from the Owner’s Guide.

# means LED is on or flashing,
_ means LED is off.

B-Class LED codes

LED value	RS-232 range	Description
_ _ _ #	7401	No memory found FAULT.
_ _ # #	7000-7F00	Memory Error FAULT. (sys console indicates which board)
_ # _ _	1030-4099	Processor board FAULT.
_ # _ #	5000-500F, 8000-8FFF, CD00-CDFF	I/O System FAULT
_ # # _	8500, 8501, 8C00-8CFF	Backplane FAULT (incl. PCI).
_ # # # # _ _ _	Any	INITIALIZATION and TESTING. (alternating 1000, 0111,…)
# _ _ #	Any not in this table	Unknown FAULT.
# _ # _	CBF0-CBFF, 1001	HPMC FAULT (very bad).
# # _ #	A088-A0FF	No console/IPL error FAULT.
# # # #		If remains for longer than 1s after power-on: processor board FAULT.

↑ up

C-Class

Taken from the Service Manual.

# means LED is on or flashing,
_ means LED is off.

C-Class LED codes

LED value	RS-232 range	Description
_ _ _ #	7500	No memory found FAULT.
_ _ # _	7501, 7502	Not enough memory found FAULT.
_ _ # #	7000-7D0A	Processor Board/Memory Error FAULT. (sys console indicates which board)
_ # _ _	1030-4071	Processor board FAULT.
_ # _ #	5000-500F, 8000-8FFF, CD00-CDFF	I/O System FAULT
_ # # _	CD1E, CDEF, CDD0	Backplane FAULT (incl. PCI).
_ # # # # _ _ _	Any	INITIALIZATION and TESTING. (alternating 1000, 0111,…)
# _ _ #	Any not in this table	Unknown FAULT.
# _ # _	CBF0-CBFF, 1001	HPMC FAULT (very bad).
# # _ #	A000-A0C0	No console/IPL error FAULT.
# # # #		If remains for longer than 1s after power-on: processor board FAULT.

↑ up

K-Class

Mathias Zubek sent in an extensive list of the K-Class Front Panel Display Codes.

↑ up

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OpenPA is an independent resource for information on PA-RISC based computers with in-depth technical descriptions and background information. Paul Weissmann is the main author and holds the Copyright © 1999-2008. His other interests include the current state of IPv6 implementations at The IPv6 Resource. Openpa.net ISSN 1866-2757.

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