Phaser 6125/6130 Color Laser Printer Service Manual 4-9
General Troubleshooting
Service Mode Diagnostic Tests
Diagnostic Tests and Utilities
Test Control Panel Display Test Description
ESS Diag Tests memory devices on the Controller.
All Test All Test
■ Start
■ Processing
■ Check OK
Tests all Controller Diag tests except
for the MAC+PHY and Control Panel
tests.
CodeROM Test CodeROM Test
■ Start
■ Processing
■ Check OK
Calculates the ROM checksum chip by
chip and compares it with the value
stored in the CodeROM itself
beforehand.
When the checksum is identical to the
stored value, this test determines the
chip is normal.
Note: Run this test when error 116-317
occurred.
FontROM Test FontROM Test
■ Start
■ Processing
■ Check OK
Calculates the Font ROM checksum
chip by chip and compares it with the
value stored in the FontROM itself
beforehand.
When the checksum is identical to the
stored value, this test determines the
chip is normal.
Note: Run this test when errors 116-
310 occurs.
EEPROM Test EEPROM Test
■ Start
■ Processing
■ Check OK
Performs write/read/verification of the
test patterns (0xff, 0xaa, 0x55, and
0x00) on one byte at every 0x400 from
the first address of EEPROM.
Note: Run this test when errors 116-
323, 116-324, and 116-327 occur.
DRAM Test DRAM Test
■ Start
■ Processing
■ Check OK
Tests Open/Short with the address line
of the DRAM, and performs write/read/
verification on the entire DRAM.
Note: Run this test when errors 116-
315, 116-316, and 116-320 occur.
MAC+PHY Test MAC+PHY Test
■ Start
■ Processing
■ Check OK
Tests PHY Internal loopback test.
Note: Run this test when error 116-352
occurs.
ASIC Test ASIC Test
■ Start
■ Check OK
Performs register test.
Note: Run this test when error 116-343
occurs.
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