Flash Rom Test; Eeprom Test; Dram Test - Fuji Xerox DocuPrint M355df Service Manual

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.
CHECK OK

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.
CHECK OK

6.5.4 DRAM Test

Writes/reads/verifies the test data in the BMM area within the memory area (standard + 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.
CHECK OK
Table 6-31 Flash ROM Test
Test Result Display
Normal
Table 6-32 EEPROM Test
Test Result Display
Normal
EEPROM ID* ERROR (*: ID number of the
Table 6-33 DRAM Test
Test Result Display
Normal
(*: 0 = Standard memory, 1 = Optional memory)
Error
Flash ROM ERROR xxxxxx
Error
EEPROM)
Error
DRAM slot* ERROR
6-39
Chapter 6 General
6.5 ESS Diag