Phaser 6130 Color Laser Printer Service Manual 4-3General TroubleshootingPower On Self Test (POST)POST Diagnostics provide a quick mean of isolating a defective subsystemassociated with the Image Processor Board and SDRAM. POST returnscontrol 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 DescriptionTest Chain Link DescriptionCodeROM 116-317 This test calculates the ROM checksum chip bychip and compares it with the value stored in theCodeROM itself.Checksum error is in the main program ROM.FontROM This test calculates the FontROM checksum chipby chip and compares it with the value stored inthe FontROM itself.116-310 Checksum error is in the built-in FontROM.116-317 Checksum error is in the main program ROM.EEPROM This test writes/reads/verifies on the diagnosticarea of the EEPROM.116-323 Error is detected in EEPROM0 duringinitialization.116-326 Error is detected in EEPROM1 duringinitialization.DRAM This test checks OPEN/SHORT of the addressline of the DRAM. This test also writes/reads/verifies on the entire DRAM.116-315 Error is detected if included RAM is different.116-316 Error is detected if extended RAM is different.116-320 Error is detected if extended RAM is notsupported.MAC+PHY Test 116-352 This test performs PHY internal loopback.ASIC 116-343 Performs register test.
