4-6 Phaser 7500 Printer Service Manual
General Troubleshooting
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=10,
indicating a failure in the EEPROM test. Along with the blinking LEDs, the failed
test also displays as:
Power On Self Test Error
10:EEPROM
CALL SERVICE SUPPORT
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
Pattern
Control Panel
Message
Action
5+5 10: EEPROM 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.
5+5+1+1 12: CPU
INTERRUPTS
Replace Image Processor Board.
5+5+5+1 16: Min RAM Add additional memory.
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