Power On Self Test (Post) - Xerox Phaser 6128MFP Service Manual

Power On Self Test (POST)

Phaser 6128MFP Service Manual
POST Diagnostics provide a quick mean of isolating a defective subsystem
associated with the Image Processor Board and SDRAM. POST returns control to
the boot loader and the operating system is loaded.
The following tests are performed when the printer is powered On.
1. Checks and initializes CRU Register.
2. Initializes ASIC.
3. Checks RAM.
4. Initializes the Control Panel driver.
5. Processes the ROM Sum Check.
6. Initializes Memory Manager.
7. Initializes EEPROM driver.
8. Initializes IOT Controller.
9. Starts the Operating System process.
POST Test Description
Test Error
CodeROM 116-317
FontROM
116-310
116-317
EEPROM
116-323
116-326
DRAM
116-315
116-316
116-320
MAC+PHY Test 116-352
ASIC 116-343
PANEL
IOT 024-371
General Troubleshooting
Description
This test calculates the ROM checksum chip
by chip and compares it with the value stored
in CodeROM.
This test calculates the FontROM checksum
chip by chip and compares it with the value
stored in FontROM.
Checksum error is in the built-in FontROM.
Checksum error is in the main program ROM.
This test verifies the EEPROM.
Error in EEPROM0 during initialization.
Error in EEPROM1 during initialization.
This test checks the DRAM.
Error if included RAM is different.
Error if extended RAM is different.
Error if extended RAM is not supported.
This test performs PHY internal loopback.
Performs register test.
This test checks Control Panel function.
This test performs communication tests
between the print engine and controller.
4-3