Post Diagnostics Test Descriptions; Table 2-1 Post Diagnostics Test Descriptions - Xerox 7700DX - Phaser Color Laser Printer Service Manual

POST Diagnostics Test Descriptions

Table 2-1 POST Diagnostics Test Descriptions

Test
SDRAM
Front Panel
I/O ASIC
Memory
EEPROM
Ethernet
CPU Interrupts
USB
Real Time Clock
RAM DIMM
Presence
RAM Limits
IDE Disk
Note If the fault code indicates 12, you must check the front
panel to see if the test name is "CPU Interrupts" or
"IDE Disk" before beginning troubleshooting.
2-34 Phaser 7700 Color Laser Printer Service Manual
Fault Code Description
1 (Hard) 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.
2 (Hard) Performed during the POST firmware initialization
phase.
If the front panel is unplugged a hard fault is indicated by
the heath LED.
3 (Hard) This test determines if the I/O chip is functioning
properly.
4 (Hard) This test checks 64-bit reads and writes to
memory.
10 (Hard) Addressing of the EEPROM part is tested.
11 (Hard) Checks the ethernet core.
12 (Hard) This test checks that each interrupt source to the
CPU is functioning.
13 (Hard) Checks that the USB core is functioning properly.
7
(Soft) The real time clock is tested.
8 (Soft) This test examines bad or incompatible RAM
DIMMs.
9
(Soft) Checks that there is at least 128 Mbytes installed
and ignores more than 512 Mbytes.
12 (Soft) Checks the disk controller core, and runs a
DIAGNOSE command on the hard drive.