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F81, F82, F83,
F84
These codes indicate there is no voltage supplied to the primary winding of the high
voltage transformer. The relationship between the codes and transformers is as
follows:
F81 (PRO-1) – Upper transformer
F81 (NE1780J, NE1780R, NE2180) – Left transformer
F81 (NE2680J, NE2680R, NE3280) – Lower left transformer
F82 (PRO-1) – Lower transformer
F82 (NE2680J, NE2680R, NE3280) – Lower right transformer
F83 (NE2680J, NE2680R, NE3280) – Upper left transformer
F84 (NE1780J, NE1780R, NE2180) – Right transformer
F84 (NE2680J, NE2680R, NE3280) – Upper right transformer
NOTE: These codes are not caused by defective high voltage components
(magnetrons, capacitor, diodes, and transformers. Replacing these
components will not solve the problem.
After identifying the malfunctioning circuit, perform the troubleshooting in the
following order:
a) Check line fuses and replace if needed
b) Check door for proper alignment, wear and tear, and excessive movement
c) Check door hooks for wear and tear (it may affect the switching sequence)
d) Check latch switch assembly and make sure that all switches operate
properly. Make sure they turn on and off when the door is open and closed.
Confirm there are free of grease and debris. NOTE: Replace all switches
even though only one may appear malfunctioning.
e) Troubleshoot relays (on the low voltage board)
f) Check controller (DPU) board for voltages necessary to actuate relays
g) Check controller (DPU) board for cracks, poor connections, or conductive
residue on the component side. Clean, repair, or apply technical bulletin
(NE1018-1757)
h) Replace low voltage board (only if confirmed defective)
i) Replace controller (DPU) board (only if confirmed defective)
PRO-1
PRO-2
PRO-1
PRO-2
F86, F87, F88,
F89
These codes indicate malfunction one of the relays (shorted contacts). The
relationship between the models and relays is as follows:
F86 – RY3 (PRO-1, PRO-2)
F87 – RY4 (PRO-1)
F87 – RY5 (NE2680J, NE2680R, NE3280)
F88 – RY7 (NE2680J, NE2680R, NE3280)
F89 – RY9 (PRO-2)
a) On PRO-1apply technical bulletin (NE1018-1757) if applicable.
NOTE: Before replacing the relays, make sure that the controller (DPU) board is free
of residue or conductive substances (component side). Clean if necessary.
PRO-1
PRO-2
No light in the
cavity, no
display, when
the door is
open
a) Line voltage (circuit breaker)
b) Fuses
c) Cavity thermal cutout
d) Thermal cutouts on all magnetrons
e) Voltages on controller (DPU) board – if missing, check the low voltage
transformer
OCS
PRO-1
PRO-2