AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 24

AR-C170M  TROUBLESHOOTING  11 - 24

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Phenomenon Detail

Though the PCU program is 
operating (the power is 
supplied), the main power 
switch OFF is detected.

Section

—

Case 1

Cause

Main power switch trouble

Check & 
Remedy

Replace the main power 
switch.

Case 2

Cause

Power supply unit trouble

Check & 
Remedy

Replace the power supply 
unit.

Case 3

Cause

Harness trouble

Check & 
Remedy

Check connection of the 
harness and the connector.

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The copy inhibit signal from 
RIC (host) is received.

Section

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Case 1

Cause

Depends on a judgment by 
the host.

Check & 
Remedy

Make notification to the 
host. Use SIM 27-1 to 
ignore.

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Communication 
establishment error, 
framing/parity/protocol error.
ROM version phase shift.

Section

—

Case 1

Cause

Disconnection of the 
operation panel 
communication connector 
of the ICU/MFP PWB, 
harness trouble between 
the ICU PWB and the MFP 
PWB.

Check & 
Remedy

Check the connector and 
the harness between the 
ICU PWB and the MFP 
PWB.

Case 2

Cause

ICU/MFP PWB trouble

Check & 
Remedy

Check grounding of the 
machine.
Replace the ICU PWB or 
the MFP PWB.

Case 3

Cause

When the OPE-ROM 
without security functions is 
installed for the ICU-ROM 
with security kit functions.

Check & 
Remedy

Check the ROM version, 
and replace it if necessary.

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FAX backup SRAM battery 
voltage fall

Section

FAX

Case 1

Cause

Battery life

Check & 
Remedy

Check to insure that the 
battery voltage is about 
2.5V or above.

Case 2

Cause

Battery circuit abnormality.

Check & 
Remedy

Check the battery circuit.

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Abnormal value is read from 
the RTC on the ICU PWB.

Section

—

Case 1

Cause

RTC circuit abnormality

Check & 
Remedy

Set the time again with the 
key operation, and check 
that time advances 
properly.
Check the RTC circuit.

Case 2

Cause

Battery voltage fall. Battery 
circuit abnormality.

Check & 
Remedy

Check to insure that the 
battery voltage is about 
2.5V or above. Check the 
battery circuit.

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EEPROM version error
EEPROM write error

Section

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Case 1

Cause

EEPROM trouble. 
EEPROM is not initialized.

Check & 
Remedy

1. Check that the EEPROM 

is properly set.

2. Use SIM 16 to cancel the 

error.

Case 2

Cause

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.