AR-206 (serv.man4). AR163 206-Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 49

Main 
code

Sub

code

Detail of trouble

U9

00

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.
Check the ROM of the operation
control PWB.

80

Content

Operation control PWB
communication trouble (Protocol)

Detail

Communication trouble between
MCU and the operation control
PWB (Protocol error)

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.

81

Content

Operation control PWB
communication trouble (Parity)

Detail

Communication trouble between
MCU and the operation control
PWB (Parity error)

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.

82

Content

Operation control PWB
communication trouble (Overrun)

Detail

Communication trouble between
MCU and the operation control
PWB (Overrun error)

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.

84

Content

Operation control PWB
communication trouble (Framing)

Detail

Communication trouble between
MCU and the operation control
PWB (Framing error)

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.

Main 
code

Sub

code

Detail of trouble

U9

88

Content

Operation control PWB
communication trouble (Time-out)

Detail

Communication trouble between
MCU and the operation PWB
(Time-out error)

Cause

Operation control PWB connector
disconnection
Operation control PWB MCU PWB
harness failure

Check and
remedy

Check the connectors and harness
of the operation control PWB and
the MCU PWB.
Check grounding of the machine.

U95

Content

Operation control PWB
communication error

Detail

Communication error between the
operation control PWB and the
MCU PWB (Detected by the OPE-
PWB)

Cause

Disconnection or reverse
connection of the flat cable
between the Operation control
PWB and the MCU PWB.
Operation control PWB trouble
MCU PWB trouble
Connector trouble of the operation
control PWB and the MCU PWB

Check and
remedy

Check insertion of or replace the
flat cable between the operation
control PWB and the MCU PWB.
Replace the operation control PWB.
Replace the MCU PWB.
Check connection of the connector
of the operation control PWB and
the MCU PWB.

U99

Content

Operation control PWB
communication error

Detail

Communication error between the
operation control PWB and the
MCU PWB (Detected by the OPE-
PWB)

Cause

Disconnection or reverse
connection of the flat cable
between the Operation control
PWB and the MCU PWB.
Operation control PWB trouble
MCU PWB trouble
Connector trouble of the operation
control PWB and the MCU PWB

Check and
remedy

Check insertion of or replace the
flat cable between the operation
control PWB and the MCU PWB.
Replace the operation control PWB.
Replace the MCU PWB.
Check connection of the connector
of the operation control PWB and
the MCU PWB.

AR-162 TROUBLE CODE LIST – 8