MX-M350N, MX-M350U, MX-M450N, MX-M450U (serv.man8). Trouble Codes - Sharp Copying Equipment Service Manual (repair manual). Page 8

MX-M350/M450 N/U  TROUBLE CODES  11 - 8

F2

39

Content

Process thermistor trouble

Detail

Output value abnormality of the 
temperature sensor of temperature/
humidity sensor 

Cause

Temperature/humidity sensor 
abnormality
Temperature/humidity sensor harness 
connection failure
PCU PWB trouble

Check and 
remedy

Check connection of the harness and 
the connector of the temperature/
humidity sensor.
Replace the temperature/humidity 
sensor.
Check PCU PWB.

58

Content

Process humidity sensor breakdown

Detail

Process humidity sensor open or short

Cause

Temperature/humidity sensor harness 
connection failure
Temperature/humidity sensor 
abnormality
PCU PWB trouble

Check and 
remedy

Check connection of the harness and 
the connector of the temperature/
humidity sensor. 
Replace the temperature/humidity 
sensor.
Check PCU PWB.

F3

12

Content

Machine no. 1 tray lift-up trouble

Detail

LUD does not turn ON in the specified 
time.

Cause

LUD trouble
No. 1 tray lift-up trouble
Check connection of harness between 
the PCVU PWB, lift-up unit, and paper 
feed unit.

Check and 
remedy

Check LUD, and their harness and 
connectors.
Check the lift-up unit. 

F3

22

Content

Machine tray 2 lift-up trouble

Detail

MCLUD does not turn ON in the 
specified time.

Cause

MCLUD trouble
No. 2 tray lift-up motor trouble
Harness disconnection f the PCU 
PWB, the lift-up unit, and the paper 
feed unit.

Check and 
remedy

Check MCLUD, and their harness and 
connectors. 
Check the lift-up unit. 

F6

00

Content

Communication trouble (ICU detection) 
between ICU and FAX

Details

Communication establishment error/
Fleming/Parity/Protocol error

Cause

Slave unit PWB connector 
disconnection
Harness abnormality between slave 
unit PWB and ICU PWB.
Slave unit PWB mother board 
connector pin breakage
Slave unit ROM abnormality/No ROM/
Reverse insertion of ROM/ROM pin 
breakable

Check & 
Remedy

Check connector harness between 
slave unit PWB and ICU PWB.
Check grounding of machine.
Check slave unit PWB ROM.

MAIN SUB

Details

F6

01

Content

FAX expansion flash memory 
abnormality (ICU detection)

Details

Flash memory cannot be deleted.

Cause

Flash memory cannot be deleted.

Check & 
Remedy

Check the FAX image storage Flash 
memory.

Use SIM 66-10 to clear the flash 
memory.

04

Content

FAX modem operation abnormality

Details

FAX PWB modem chip operation 
abnormality

Cause

Modem chip operation abnormality in 
FAX PWB

Check & 
Remedy

Replace FAX PWB.

20

Content

FAX write protect cancel

Detail

The write protect JP is released.

Cause

The write protect JP is set to “write 
allow.”
FAX interface PWB trouble
FAX PWB trouble

Check and 
remedy

Check the write protect JP.
Replace the FAX PWB. Replace the 
FAX interface PWB.

21

Content

Combination abnormality of the TEL/
LIU PWB and the FAX soft switch

Detail

Combination abnormality of the TEL/
LIU PWB and the FAX PWB 
information (soft switch)
Or the TEL/LIU PWB is not a new one 
for new MDMC PWB.

Cause

The destination of the installed TEL/LIU 
PWB differs.
The FAX PWB information (soft switch) 
differs.
TEL/LIU PWB trouble

Check and 
remedy

Check the destination of the TEL/LIU 
PWB.
Check the FAX PWB information (soft 
switch).
Replace the TEL/LIU PWB.

97

Content

FAX-BOX skating trouble
The FAX-BOX PWB is not one for the 
AR-FX12. (FAX detection)

Detail

The FAX-BOX MODEM controller is not 
one for the AR-FX12. 

Cause

The FAX-BOX Modem controller PWB 
information (hard detection) is not for 
the AR-FX12. (The Modem controller 
PWB for the AR-FX5 or the AR-FX6 is 
used.)

Check and 
remedy

Check the FAX-BOX modem controller 
PWB.
Replace it with a modem controller 
PWB for the AR-FX12.

MAIN SUB

Details