Post Diagnostic Test Descriptions - Xerox 7750DXF - Phaser Color Laser Printer Service Manual

POST Diagnostic Test Descriptions

Test
SDRAM
Local Bus/
Front Panel
I/O ASIC
MEM
Configuration
Chip
EEPROM
Ethernet
CPU Interrupts
USB
Real Time
Clock
RAM DIMM
Presence
Min RAM Limits
Max RAM
Limits
IDE Disk
CPU Fan
Cage Fan
Error Messages and Codes
Fault Fault
Type Code
Hard 1
Hard 2
Hard 3
Hard 4
Hard 5
Hard 10
Hard 11
Hard 12
Hard 13
Soft 14
Soft 15
Soft 16
Soft 17
Soft 20
Hard 24
Hard 25
Description
This test fails if the boot loader finds no RAM present
or faulty RAM.
Boot loader posts the message "RAM error" to the
front panel and blinks the front panel LED and IP
Board health LED.
Performed during the POST firmware initialization
phase.
If the front panel is unplugged, a hard fault is indicated
by the heath LED.
This test determines if the I/O chip is functioning
properly.
This test determines if the memory access function
works at selected addresses
This test checks to see if the configuration chip is
present. If no chip is present the test fails and the front
panel message "Please Install configuration chip
displays.
This test checks addressing of the EEPROM.
This test checks the ethernet core.
This test checks that each interrupt source to the CPU
is functioning.
This test checks that the USB core is functioning
properly.
The real time clock is tested.
This test examines bad or incompatible RAM DIMMs.
Checks that there is at least 128 MB installed and
ignores more than 512 MB.
Checks to ensure no more than 1 GB of RAM is
installed.
Checks the disk controller core, and runs a
DIAGNOSE command on the hard drive.
Checks hardware to see if a failure of the CPU cooling
fan has occurred.
Checks hardware to see if a failure of the electronics
cooling fan has occurred.
3-9