AR-M351U, AR-M451U (serv.man19). Trouble Codes - Sharp Copying Equipment Service Manual (repair manual). Page 11

AR-M351U/M451U, AR-M355U/M455U  TROUBLE CODES  11 - 11

U2

11

Content

Counter check sum error (ICU)

Detail

Counter data area check sum error

Cause

EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit 
trouble

Check and 
remedy

Check that EEPROM is properly 
inserted. 
Save the counter/adjustment values 
with the  DIAG simulation.
Use DIAG (SIM16) to cancel U2 
trouble.
Replace the ICU PWB.

12

Content

Adjustment value check sum error 
(ICU)

Detail

Adjustment data area check sum error

Cause

EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit 
trouble

Check and 
remedy

Check that EEPROM is properly 
inserted. 
Save the counter/adjustment values 
with the  simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.

22

Content

SRAM memory check sum error (ICU)

Detail

MFPC section SRAM memory check 
sum error

Cause

SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble

Check and 
remedy

Initialize the communication 
management table registered in the 
SRAM and the FAX soft switch.
Since the registered data are deleted, 
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.

23

Content

SRAM memory individual data check 
sum error (ICU)

Detail

Check sum error for every data in the 
SRAM memory of the MFPC section
(Communication management table, 
sender registration data, etc.)

Cause

SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble

Check and 
remedy

Automatically initialize the data related 
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted, 
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.

MAIN SUB

Details

U2

50

Content

HD section individual data check sum 
error (ICU)

Detail

Check sum error for every individual 
data in HD of the MFPC section (One-
touch, Group, Program, etc.)

Cause

HDD write/read error
Control circuit runaway due to noises
ICU PWB HD access circuit trouble

Check and 
remedy

Automatically initialize the data related 
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted, 
register the data again.
Use SIM 16 to cancel the U2 trouble.
Replace the HD PWB.
Replace the ICU PWB.

80

Content

EEPROM read/write error (Scanner)

Details

Scanner EEPROM write error

Cause

EEPROM abnormality
Scanner PWB EEPROM access circuit 
abnormality

Check & 
Remedy

Check that EEPROM is set properly.
Record counter/adjustment values with 
the simulation to protect the data from 
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.

81

Content

Memory check sum error (Scanner)

Details

Scanner memory check sum error

Cause

EEPROM trouble
EEPROM which is not initialized is 
installed.
Control circuit freeze by noises
Scanner PWB EEPROM access circuit 
trouble

Check & 
Remedy

Check that EEPROM is set properly.
Record counter/adjustment values with 
the simulation to protect the data from 
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.

90

Content

EEPROM read/write error (PCU)

Detail

PCU EEPROM write error

Cause

EEPROM trouble
PCU PWB EEPROM access circuit 
trouble

Check and 
remedy

Check that EEPROM is properly 
inserted. 
Record counter/adjustment values with 
the simulation to protect the data from 
being deleted.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.

91

Content

Memory check sum error (PCU)

Detail

PCU memory check sum error

Cause

EEPROM trouble
EEPROM which is not initialized is 
installed.
EEPROM is not initialized.
PCU PWB EEPROM access circuit 
trouble
Hang of control circuit due to noises

Check and 
remedy

Check that EEPROM is properly 
inserted. 
Save the counter/adjustment values 
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.

MAIN SUB

Details