Dell 3010cn - Color Laser Printer, Service Manual

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Chapter 2 Operation of Diag.
4.1 Details of ESS Diagnosis
This section describes what is performed in each test of the ESS diagnosis in detail.
4.1.1 Executing ESS Diagnosis
1) The power is turned off.
2) The power is turned on while holding down “ ” and “ ” keys.
3) Release the keys when “Diagnosing” is displayed.
4) The “Customer Mode” and “ESS Diagnosis” are displayed. (Entered the Diagnosis.)
5) Press “ ” key.
6) Press “ ” key to select the test item.
7) Press “ ” key twice. (Executed the test)
4.1.2 CodeROM Test
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.
4.1.3 FontROM Test
This test calculates the checksum of the each FontROM, 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.
4.1.4 EEPROM Test
When this test reads a predefined address of the EEPROM and does not find the initialization
mark, it performs read/write/verify of the increment data for the whole area of the EEPROM. If
the intialization is completed, the test performs read/write/verify of the test patterns (0xffffffff,
0xaaaaaaaa, 0x55555555, 0x0000000) for the area used by the diagnosis except the area for the
mark.
Normal Error
CHECK OK
CodeROM #* ERROR
S=xxxx V=yyyy
(xxxx:calculated value yyyy:ROM stored value #*:0,1)
Normal Error
CHECK OK
FontROM ERROR
S=xxxx V=yyyy
(xxxx:calculated value yyyy:ROM stored value)
Normal Error
CHECK OK EEPROM ID* ERROR (ID*:1,2)