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Chapter 2 Operation of Diagnostic
Epson AcuLaser C2900N
Revision B
Confidential
4. Diag Types and Test Contents
4.1 ESS Diag
This section describes how to perform each test of the ESS Diag in detail.
4.1.1 Executing ESS diagnosis
1) Turn off the power.
2) Turn on the power while holding down "S" and "T" keys.
3) Release the fingers from these keys when the "CE Mode" and "Password" is displayed.
4) Press "T" key twice and press "OK" key.
5) The "CE Mode" and "ESS Diag" are displayed. (Entered the Diag. mode.)
6) Press "OK" key.
7) Press "S" or "T" key to select the test item.
8) Press "OK" key twice to execute the test.
To exit the test or to return to one step higher menu, press the "STOP" key.
4.1.2 All Test
Executes the ESS Diag except the following.
MAC+PHY Test/Panel Test/USB Host Test/RTC Test
***:Displays the test name that became error.
(FlashROM/EEPROM/DRAM/ASIC/IOT)
4.1.3 FlashROM Test
Calculates the ROM checksum and compares it with the value stored in the ROM.
Executes this test when the 116-317 error occurred.
Test result: NG (Go to FIP.) OK (Turn off/on the main power.)
This test calculates the checksum of the each ROM, and compares it with the valid checksum value
stored in the corresponding chip beforehand. When the checksum is identical to the stored value, this
test judges the chip is normal.
XXX: Displays the header name that became error.
(GLOBE/DACS/PCLFONT/HOSTBASE/CBRIDGE/BMFAPFONT)
Normal Error
CHECK OK *** ERROR
Normal Error
CHECK OK
FlashROM ERROR
XXXXXX
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