Epson AcuLaser C8500, Service Manual

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EPSON AcuLaser C8500 Revision C
Chapter 4 Diagnostics 4-49
4.2.5.13 EEPROM Write
This lets you write and change data stored in the MCU PWB
EEPROM(NVM).
NOTE: NVM numbers besides those specified in this manual are
important system values. Never write to these values.
NOTE: After writing data, you must send the DIAGOFF command to
write to the EERPROM.
NOTE: Code_EP (NVM number) must be entered in 2 bytes in order
from the least significant.
NOTE: Status data is displayed in 4 bytes in order from the least
significant.
NOTE: Be fully careful because it can't recover any more if you don't
input Length.
NOTE: When data is a negative value, values decrease from [FFh]: [-1]
= [FFh], [-2] = [FEh], etc.
NOTE: When MCU PWB is exchanged, though it is being made a
principle that exchange of EEPROM (NVM : U2) is done, begin
to read the following NVM number from MCU PWB before the
exchange surely, and do [EEPROMRead], and write down value
when exchange of EEPROM isn't made. (Do Log Save.)
And write the value estimated more than the use conditions
when it isn't made that if it begins to read it, exchange of
EEPROM in either.
Table 4-16. EEPROM Write
DIAGON command: [75] DIAGOFF command: [76]
DIAG Command (EEPROM Write) : [90 06 XX X YY XX XX XX]
DIAG Command (EEPROM Write) : Unnecessary
Parameter Function Data (Hex)
1 Diagnostics Type 06 : EEPROM Write
2 Code_EP NVM number (see “2.6.15 NVM List”)
3 Code_EP NVM number (see “2.6.15 NVM List”)
4 Data [For command] data
DGST [For status] 06 : Pass , 07 : Fail
5 Data [For command] data
6 Data [For command] data
7 Data [[For command] data
Status present ( [90 06 XX XX XX] )