Sharp MX 3501N - Color Laser - Copier, Service Manual

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MX3500N SELF DIAG AND TROUBLE CODE 8 – 26
U2-23 MFPC section SRAM memory
individual data check sum error
U2-24 SRAM memory user authentication
counter check sum error
U2-25 Flash memory user authentication
counter check sum error
U2-30 Serial number data discrepancy
(MFP
PCU)
U2-50 HDD section individual data check
sum error
U2-80 EEPROM read/write error
(SCU detection)
U2-81 Adjustment value check sum error
(SCU detection)
Trouble content MFPcnt PWB SRAM memory individual data
check sum error (Communication management
table, sender registration data, etc.)
Section MFP
Case 1 Cause SRAM trouble
Check and
remedy 1) Turn OFF/ON the power to initialize the data
related to the check sum error automatically.
2) Since the registered contents have been
deleted, register them again.
Case 2 Cause Control circuit hang-up due to electrical noises
Check and
remedy Use SIM16 to cancel U2 trouble.
Case 3 Cause MFPcnt PWB SRAM access circuit trouble
Check and
remedy Replace the MFPcnt PWB.
Trouble content Check sum error of the user counter on SRAM
Section MFP
Case 1 Cause 1) SRAM trouble
2) Control circuit hang-up due to electrical
noises
3) MFPcnt PWB SRAM access circuit trouble
Check and
remedy Use SIM16 to cancel U2 trouble.
Trouble content Check sum error of the user authentication
counter on FLASH
Section MFP
Case 1 Cause Flash trouble. Control circuit hang-up due to
electrical noises
MFPcnt PWB FLASH access circuit trouble.
Check and
remedy Use SIM16 to recalculate the check sum of the
user counter and save the normal sum value.
Trouble content The serial number stored in the PCU differs from
that stored in the MFP.
Section MFP
Case 1 Cause EEPROM is not changed when the PCU/MFPcnt
PWB is replaced.
Check and
remedy 1) Check that EEPROM is properly set.
2) Check that EEPROM on the previous PWB is
inserted to the newly installed PWB.
Trouble content MFPcnt HDD individual data check sum error
(One-touch, group, program, etc.)
Section MFP
Case 1 Cause Write/read error to/from HDD
Check and
remedy 1) Turn OFF/ON the power to initialize the data
related to the check sum error contents.
2) Since the registered contents have been
deleted, register them again.
3) If the trouble is not canceled, replace the
HDD.
Case 2 Cause Control circuit hang-up due to electrical noises
Check and
remedy Use SIM16 to cancel U2 trouble.
Case 3 Cause MFPcnt PWB HDD access circuit trouble
Check and
remedy Replace the MFPcnt PWB.
Trouble content 1) EEPROM version error
2) Write error to EEPROM
Section Scanner
Case 1 Cause EEPROM trouble, installation of EEPROM which
is not initialized
Check and
remedy Check that EEPROM is properly set.
Case 2 Cause SCU PWB EEPROM access circuit trouble
Check and
remedy To avoid deletion of the counter data/adjustment
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
Trouble content EEPROM (SCU) check sum error
Section Scanner
Case 1 Cause Control circuit hang-up due to electrical noises
Check and
remedy Use SIM16 to cancel U2 trouble.
Case 2 Cause EEPROM trouble
Check and
remedy To avoid deletion of the counter data/adjustment
data, use the simulation to save the counter/
adjustment values. (If there is a printer option,
execute SIM22-1 to save the counter data and the
adjustment values.) Replace the SCU PWB. Use
SIM16 to cancel the trouble.
Case 3 Cause SCU PWB EEPROM access circuit trouble
Check and
remedy Check that EEPROM is properly set.