AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 25

AR-C170M  TROUBLESHOOTING  11 - 25

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EEPROM (ICU) check sum 
error

Section

—

Case 1

Cause

EEPROM trouble

Check & 
Remedy

1. Check that the EEPROM 

is properly set.

2. Use SIM 16 to cancel the 

error.

Case 2

Cause

Control circuit freeze by 
noises.
ICU PWB EEPROM access 
circuit trouble.

Check & 
Remedy

1. To prevent against 

deletion of the counter 
data and the adjustment 
data, record them with 
the simulation. (When a 
printer option is installed, 
use SIM 22-1 to record 
the counter data and the 
adjustment data.)

2. Replace the ICU PWB.
3. Use SIM 16 to cancel the 

error.

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FAX backup SRAM 
memory check sum error

Section

FAX

Case 1

Cause

SRAM trouble

Check & 
Remedy

Initialize the one-touch dial 
and the FAX soft switch 
registered in the SRAM. 
Cancel the trouble with SIM 
16.

Case 2

Cause

Control circuit freeze by 
noises.
Access circuit trouble.

Check & 
Remedy

Replace the FAX PWB. Use 
SIM 16 to cancel the error.

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The production No. 
recorded in the PCU differs 
from that recorded in the 
ICU.

Section

—

Case 1

Cause

EEPROM is not exchanged 
when replacing the PCU/
ICU PWB.

Check & 
Remedy

Check that the EEPROM is 
properly installed. When 
replacement, check that the 
EEPROM before 
replacement is inserted to 
the board after 
replacement.

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EEPROM version error
EEPROM write error

Section

—

Case 1

Cause

EEPROM trouble, Insertion 
of EEPROM which is not 
initialized or defective.

Check & 
Remedy

1. Check that the EEPROM 

is properly inserted.

2. Use SIM 16 to cancel the 

error.

Case 2

Cause

SCN PWB EEPROM 
access circuit trouble

Check & 
Remedy

1. To prevent against 

deletion of the counter 
data and the adjustment 
data, record them with 
the simulation. (When a 
printer option is installed, 
use SIM 22-1 to record 
the counter data and the 
adjustment data.)

2. Replace the SCN PWB.
3. Use SIM 16 to cancel the 

error.

Main 
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Sub 

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Phenomenon Detail

EEPROM (SCN) check sum 
error

Section

—

Case 1

Cause

EEPROM trouble

Check & 
Remedy

1. Check that the EEPROM 

is properly inserted.

2. Use SIM 16 to cancel the 

error.

Case 2

Cause

SCN PWB EEPROM 
access circuit trouble

Check & 
Remedy

1. To prevent against 

deletion of the counter 
data and the adjustment 
data, record them with 
the simulation. (When a 
printer option is installed, 
use SIM 22-1 to record 
the counter data and the 
adjustment data.)

2. Replace the SCN PWB.
3. Use SIM 16 to cancel the 

error.