4-6
Xerox Internal Use Only
Phaser 6500/WorkCentre 6505 Service Manual
General Troubleshooting
Power On Self Test (POST)
POST tests run when the printer is powered On. Errors are reported to the display.
1. Checks and initializes CRU Register.
2. Initializes ASIC.
3. Checks RAM.
4. Initializes the Control Panel driver.
5. Checks the ROM checksum.
6. Checks memory.
7. Initializes EEPROM driver.
8. Initializes IOT controller.
9. Starts the operating system.
POST Test Description
Test
Error
Description
CodeROM
116-317
This test calculates the ROM checksum and
compares it to the value stored in CodeROM.
FontROM
This test calculates the FontROM checksum
and compares it to the value stored in
FontROM.
116-310
Checksum error is in the built-in FontROM.
116-317
Checksum error is in the main program ROM.
EEPROM
This test verifies the EEPROM.
116-323
Error in EEPROM0 during initialization.
116-326
Error in EEPROM1 during initialization.
DRAM
This test checks the DRAM.
116-315
Error if included RAM is different.
116-316
Error if extended RAM is different.
116-320
Error if extended RAM is not supported.
MAC+PHY Test
116-352
This test performs PHY internal loopback.
ASIC
116-343
Runs register test.
PANEL
This test checks Control Panel function.
IOT
024-371
This test Runs communication tests between
the print engine and controller.