AL-1611 (serv.man12). Trouble code list - Sharp Copying Equipment Service Manual (repair manual). Page 6

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AL-1611/AL-1622
TROUBLE CODE LIST
10 – 6
U9
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 dis-
connection 
Operation control PWB MCU PWB har-
ness 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 dis-
connection 
Operation control PWB MCU PWB har-
ness 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 dis-
connection 
Operation control PWB MCU PWB har-
ness 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 dis-
connection 
Operation control PWB MCU PWB har-
ness failure
Check and 
remedy
Check the connectors and harness of 
the operation control PWB and the MCU 
PWB. 
Check grounding of the machine.
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 dis-
connection 
Operation control PWB MCU PWB har-
ness 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
U95
Content
Operation control PWB communication 
error
Detail
Communication error between the oper-
ation 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 con-
trol 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 oper-
ation 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 con-
trol 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.
Main
code
Sub
code
Detail of trouble
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