MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 31

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MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 31
 
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 (MFP)
 
U2-80
EEPROM read/write error 
(SCU detection)
 
U2-81
Adjustment value check sum error 
(SCU detection)
 
U2-90
EEPROM read/write error 
(PCU 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 contents 
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 
automatically.
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
Write error to EEPROM
Section
SCU
Case 1
Cause
EEPROM trouble/Not installed.
Check and 
remedy
Check that EEPROM is properly set.
Case 2
Cause
SCU PWB EEPROM access circuit trouble
Check and 
remedy
Replace the SCU PWB. 
Use SIM16 to cancel the trouble.
Trouble content
EEPROM (SCU) check sum error
Section
SCU
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, installation of EEPROM which is 
not initialized.
Check and 
remedy
To avoid deletion of the counter data/adjustment 
values, use the simulation to save the counter/
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.
Trouble content
EEPROM version error, write error to EEPROM
Section
PCU
Case 1
Cause
EEPROM trouble,  installation of EEPROM which 
is not initialized.
Installation of 64KBit EEPROM
Check and 
remedy
Check that EEPROM is properly set.
Check to insure that 256KBit EEPROM is installed.
Case 2
Cause
PCU PWB EEPROM access circuit trouble
Check and 
remedy
To avoid deletion of the counter data/adjustment 
values, 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 PCU PWB. Use 
SIM16 to cancel the trouble.
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