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50 Error/50 Service (fuser malfunction)
All Printers
A temporary error has occurred.
– Turn the printer off for 20 minutes to clear the temporary 50
The power is low or unstable (for example, in a brownout).
– Locate and verify a stable power source.
6L, 5L
Check the resistance between pins 1 and 2 from connector J102 of
the DC controller and the thermistor.
– If there is no resistance, replace the heating element. If the
resistance is correct, replace the DC controller.
6P, 5P
The fuser is defective.
The DC controller is defective.
LJ 5, 4 Plus, 4
The fuser or power supply is defective.
– if the problem persists, replace the fuser and then replace the
power supply.
A temporary error has occurred.
– Short the C202 (LJ 4) or C205 (LJ 4 Plus) on the DC controller to
bypass the Error 50 time delay.
4V, 4L, 4P
The fuser is improperly seated.
The fuser is defective.
42 – Control panel messages


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