Phaser 6280 Color Laser Printer Service Manual 4-11General TroubleshootingService Diagnostics TestsService Diagnostic Tests and UtilitiesService Diagnostic Test TableTest Control Panel Display Test DescriptionESS Diag Tests memory devices on the Controller.All Test All Test■ Start■ Processing■ Check OKTests all Controller Diag tests exceptfor the MAC+PHY and Control Paneltests.CodeROM Test CodeROM Test■ Start■ Processing■ Check OKCalculates the ROM checksum chip bychip and compares it with the valuestored in the CodeROM itselfbeforehand.When the checksum is identical to thestored value, this test determines thechip is normal.Note: Run this test when error 116-317occurred.EEPROM Test EEPROM Test■ Start■ Processing■ Check OKPerforms write/read/verification of thetest patterns (0xff, 0xaa, 0x55, and0x00) on one byte at every 0x400 fromthe first address of EEPROM.Note: Run this test when errors 116-323, 116-324, and 116-327 occurred.DRAM Test DRAM Test■ Start■ Processing■ Check OKTests Open/Short with the address lineof the DRAM, and performs write/read/verification on the entire DRAM.Note: Run this test when errors 116-315, 116-316, and 116-320 occurred.MAC+PHY Test MAC+PHY Test■ Start■ Processing■ Check OKTests PHY Internal loopback test.Note: Run this test when 116-352,116-392, 116-393, and errors 116-394occurred.ASIC Test ASIC Test■ Start■ Check OKPerforms register test.Note: Run this test when error 116-343occurred.PANEL Test PANEL Test■ StartChecks input and output of the ControlPanel buttons. When buttons arepressed as shown, the test displays thecorresponding contents on the LED.Button LCDNote: To exit the Panel Test, press the Up and Down buttonssimultaneously.Up Displays Up on the LCD.Down Displays Down on the LCD.
