Muratec MFX-C4000 Field Engineering Manual page 202

5) Fuser Low/High Error
Description : Fuser Low/High Error is Displayed.
Check the flow chart
Enter the diagnostic mode.
And check the condition of the thermistor.
Wire connections between
FDB and other devices are
Verify resistance of AC
connector below 10ohm
IN FDB PBA, Check 24V
(in 6pin connector No1)
Lamp 1 signal (Con. No. 2)
Relay On signal (Con No.5)
Replace ENGINE PBA
Service Manual
Alignment & Troubleshooting
all correct?
O.K
O.K
O.K
O.K
In FDB PBA, Check
O.K
N.G
Check wire connections
N.G
N.G
Go to Cover Open Session
N.G
4-96
Replace FUSER unit
Replace FDB PBA