Canon LBP1760P Service Manual page 188

CHAPTER 4
M-4. "5F-56 ERROR" (Duplexing unit exhaust fan (FM701) malfunction)
<Possible causes>
1. Poor contact in the connectors of the FM701 drive signal line
Action: Reconnect the intermediate connectors J718 and J719, then the duplexing unit dri-
ver PCB connector J707.
2. Defective fan motor
Action: Replace the exhaust fan.
3. Defective duplexing unit driver PCB
Action: Replace the duplexing unit driver PCB.
M-5. "5F-59 ERROR" (Cooling fan (FM101) malfunction)
<Possible causes>
1. Poor contact in the connector of the FM101 drive signal line
Action: Reconnect the engine controller PCB connector J54.
2. Defective fan motor
Action: Disconnect the engine controller PCB connector J54. Turn the power ON, then
measure the voltage between engine controller PCB connector J54-1 (/FON) and
J54-3 (GND). If the voltage changes from 0V to about 24V, replace the cooling fan.
3. Defective engine controller PCB
Action: Replace the engine controller PCB.
M-6. "5F-60 ERROR" (Duplex Option error)
<Possible causes>
1. Defective duplexing unit connector
Action: Remove the duplexing unit from the printer and check the connector. Replace the
connector if any failure is found.
2. Defective printer connector
Action: Check the connector. Replace the connector if any failure is found.
3. Defective duplexing unit driver PCB
Action: Replace the duplexing unit driver PCB.
4. Defective engine controller PCB
Action: Replace the engine controller PCB
M-7. "5F-61 ERROR" (Envelope Option error)
<Possible causes>
1. Defective envelope feeder connector
Action: Remove the envelope feeder from the printer and check the connector. Replace the
connector if any failure is found.
2. Defective printer connector
Action: Check the connector. Replace the connector if any failure is found.
4 - 26