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