Power On Self Test (Post) - Xerox Phaser 6360 Service Manual

Power On Self Test (POST)

Phaser 6300/6350/6360 Service Manual
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
displays.
POST Test Descriptions
Fault Fault
Test Code Type
SDRAM 1 Hard
Control Hard
Panel
Extended 7
Memory
EEPROM 10 Hard
Ethernet 11 Soft
CPU 12 Hard
Interrupts
USB 13 Soft
Real-Time 14 Soft
Clock
RAM DIMM 15 Soft
Min. RAM 16 Hard
Max. RAM 17 Soft
IDE Disk 20 Soft
Engine 22 Hard
Command
Description
This test fails if the boot loader finds no or faulty RAM
(Run prior to POST.). The boot loader displays "RAM
ERROR" and blinks the Health and Control Panel LEDs.
This test checks the Control Panel connection and
firmware. A fault is indicated on the Health LED.
This test does a write compare test to each 32-bit word
in extended memory.
This test checks addressing of the EEPROM.
This test checks the ethernet core.
This test checks that each interrupt to the CPU is
functioning.
This test checks that the USB core is functioning
properly.
The real-time clock is tested.
This test checks RAM compatibility.
Checks that there is at least 128 Mbytes installed.
Control Panel displays "Install More RAM" on failure.
Checks that there is no more than 1 GB installed.
Checks for a hard drive, then checks the disk controller
core.
Checks communications between the Engine Control
and Image Processor boards.
General Troubleshooting
4-3