Post Hard Fault Messages - Xerox Phaser 7400 Service Manual

POST Hard Fault Messages

POST indicates a hard fault by displaying a message on the Control Panel and
blinking the fault code on the health and Control Panel LEDs. There are long and
short blinks. A long blink is worth 5 and a short blink is worth 1. As an example, a
blink pattern flashed as long, long, short, short, represents fault code 5+5+1+1=12,
indicating a failure in the CPU interrupt test. Along with the blinking LEDs, the failed
test also displays as:
The exception to this reporting scheme is a RAM test error. The Boot Loader executes
a RAM test prior to loading POST. If the Boot Loader encounters a RAM error, POST
does not load.
Hard Error LED Blink Patterns and Messages
LED Blink Control Panel
Pattern Message
1 RAM ERROR
1+1
5+5 10: EEPROM
5+5+1+1 12: CPU
INTERRUPTS
5+5+5+1 16: Min RAM
General Troubleshooting
POWER ON SELF TEST ERROR
12:CPU INTERRUPTS
CALL SERVICE
Action
No RAM present, or faulty RAM. Alternate 1/2 second
interval blink at Control Panel and Health LEDs if the
controller has initialized the FPGA. Otherwise, only the
Health LED blinks.
Control Panel disconnected or defective.
1. Switch Off printer power.
2. Remove and re-install the NVRAM EEPROM.
3. Switch On printer power.
4. If the error message persists, replace NVRAM, and then
the Image Processor Board.
Replace Image Processor Board (page 8-113).
Add additional RAM memory.
4-5