Power On Self Test (Post) - Xerox Phaser 6130 Service Manual

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Power On Self Test (POST)

Phaser 6130 Color Laser Printer 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.
10.
Printer is Ready.
POST Test Description
Test
Chain Link
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
General Troubleshooting
Description
This test calculates the ROM checksum chip by
chip and compares it with the value stored in the
CodeROM itself.
Checksum error is in the main program ROM.
This test calculates the FontROM checksum chip
by chip and compares it with the value stored in
the FontROM itself.
Checksum error is in the built-in FontROM.
Checksum error is in the main program ROM.
This test writes/reads/verifies on the diagnostic
area of the EEPROM.
Error is detected in EEPROM0 during
initialization.
Error is detected in EEPROM1 during
initialization.
This test checks OPEN/SHORT of the address
line of the DRAM. This test also writes/reads/
verifies on the entire DRAM.
Error is detected if included RAM is different.
Error is detected if extended RAM is different.
Error is detected if extended RAM is not
supported.
This test performs PHY internal loopback.
Performs register test.
4-3

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