AR-C170 (serv.man28). Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 18

AR-C170M  TROUBLESHOOTING  11 - 18

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon Detail

The difference between the 
correction value after 
execution of half-tone 
process control and the 
previous correction value 
exceeds the specified max. 
value of each color.
<The error is recorded in 
the trouble history, but F2 
trouble is not indicated on 
the display and the previous 
correction value is 
remained.>

Section

—

Common

Check

Use SIM 44-2 to adjust the 
process control sensor 
gain.

Case 1

Cause

When "Error" occurs in the 
gain adjustment of SIM 44-
2:
1. Disconnection of the 

harness between the 
PCU PWB and the 
image density sensor.

2. Image density sensor 

dirt/trouble.

Check & 
Remedy

1. Check connection of the 

harness between the 
PCU PWB and the 
image density sensor.

2. Clean/replace the image 

density sensor.

Case 2

Cause

When SIM 44-2 gain 
adjustment is completed: 
Insufficient cleaning of the 
transfer belt, calibration 
plate solenoid operation 
trouble

Check & 
Remedy

Check the drum surface 
and the belt surface.

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon Detail

LUD1 does not turn on 
within the specified time.

Section

—

Case 1

Cause

LUD1 sensor trouble, 
disconnection of harness 
among the PCU PWB, the 
lift-up unit, and the paper 
feed unit.

Check & 
Remedy

Check LUD1, its harness, 
and the connector. 

Case 2

Cause

Cassette 1 lift-up motor 
trouble

Check & 
Remedy

Check the lift-up unit.

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon Detail

Communication 
establishment error, 
framing, parity, protocol 
error

Section

FAX

Case 1

Cause

Slave unit PWB connector 
connection trouble. Slave 
unit PWB-ICU PWB 
harness trouble

Check & 
Remedy

Check connection between 
the slave unit PWB and the 
ICU PWB, and check the 
harness.

Case 2

Cause

Broken pin of the mother 
board connector of the 
slave unit PWB

Check & 
Remedy

Check the connector of the 
slave unit PWB.

Case 3

Cause

Slave unit ROM trouble/ No 
ROM/ Improper insertion of 
ROM/ ROM pin breakage

Check & 
Remedy

Check grounding of the 
main unit. Check the ROM 
of the slave unit PWB.

Main 
code

Sub 

code

Title

Display

Lamp/Message

Phenomenon Detail

An expansion flash memory 
with SRAM backup data in it 
is installed.

Section

FAX

Case 1

Cause

SRAM backup data are 
detected in the expansion 
flash memory. The 
simulation function (SIM 66-
19) is provided to save 
SRAM backup data into an 
expansion flash memory. 
This trouble occurs when an 
expansion flash memory to 
which SRAM backup data 
are saved with the above 
function is installed.

Check & 
Remedy

Use SIM 66-20 to restore 
the backup data to the 
SRAM, and use SIM 66-10 
to clear the expansion flash 
memory. If the data are 
unne3cessary, simply clear 
the expansion memory with 
SIM 66-10.