Fuji Xerox DocuPrint M355df, Service Manual

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Chapter 6 General
6.5 ESS Diag
6-39
6.5.2 Flash ROM Test
Calculates the checksum per Flash ROM header area and compares the result with the area-specific check-
sum stored in the ROM in advance. If the checksum values of all areas match, the status is regarded as nor-
mal.
6.5.3 EEPROM Test
Writes, reads, and verifies the test data (0xff, 0xaa, 0x55, and 0x00) on the EEPROM at every 0x400 address
from the head address.
6.5.4 DRAM Test
Writes/reads/verifies the test data in the BMM area within the memory area (st optional DIMM) of the
DRAM. The optional memory area is tested only when the optional DIMM is installed.
Writes the test data (0x55555555, 0xaaaaaaaa, and 0xffffffff) sequentially in the BMM area from the head
address to the tail address, and then reads and verifies the entire area. Restores the BMM area after complet-
ing the test.
Table 6-31 Flash ROM Test
Test Result Display
Normal Error
CHECK OK Flash ROM ERROR xxxxxx
Table 6-32 EEPROM Test
Test Result Display
Normal Error
CHECK OK
EEPROM ID* ERROR (*: ID number of the
EEPROM)
Table 6-33 DRAM Test
Test Result Display
Normal Error
CHECK OK
DRAM slot* ERROR
(*: 0 = Standard memory, 1 = Optional memory)