Power On Self Test (Post) - Fuji Xerox Phaser 5500 Service Manual

Power On Self Test (POST)

POST diagnostics provide a quick means of isolating a defective subsystem
associated with the Image Processor Board and SDRAM. There are two kinds of
POST faults: soft and hard. A soft fault is any fault that allows the operating system to
initialize. Soft faults do not stop printer operation and are reported on the Startup Page
after the system is running. A hard fault prevents the operating system from
initializing stopping further printer operation. Hard faults are indicated with blinking
LEDs and the failed test appearing on the display.
The following tests execute when the printer is powered on after the Boot Loader
runs, and before the operating system is loaded and initialized. Bypass POST by
pressing the OK button at power on until the splash screen appears.
POST Test Descriptions
Fault
Test Code
SDRAM 1
I/O ASIC 3
Memory 4
EEPROM 10
Ethernet 11
CPU 12
Interrupts
USB 13
RTC (3 tests) 14
RAM DIMM 15
Presence
Install more 16
RAM
Too much 17
RAM
IDE Disk 20
Engine 22
Command
3-4
Fault
Type Description
Hard This test fails if the Boot Loader finds faulty or no RAM.
Hard This test determines if the I/O chip is functioning properly.
Hard This test checks 64-bit reads and writes to RAM memory.
Hard This test checks addressing of the NVRAM.
Hard This test checks the Ethernet core.
Hard This test checks that each CPU interrupt source is
functioning.
Hard This test checks that the USB core is functioning properly.
Soft These tests check the functionally of the Real Time Clock for
a number of conditions.
Soft This test examines bad or incompatible RAM DIMMs.
Soft Checks that there is at least 64 MB of memory installed and
ignores more than 512 MB.
Soft Checks that there is no more than 512 MB of memory
installed.
Soft Checks the disk controller core, and runs a DIAGNOSE
command on the hard drive.
Hard Checks communication between the Image Processor Board
and the Engine Logic Board.
Phaser 5500 Printer Service Manual