F81, F82, F83,

These codes indicate there is no voltage supplied to the primary winding of the high

PRO-1

F84

voltage transformer. The relationship between the codes and transformers is as

PRO-2

 

follows:

 

PRO-1

 

 

 

 

 

F81 (PRO-1) – Upper transformer

PRO-2

 

 

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)

 

 

 

 

F86, F87, F88,

These codes indicate malfunction one of the relays (shorted contacts). The

PRO-1

F89

relationship between the models and relays is as follows:

PRO-2

 

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.

 

 

 

 

 

No light in the

a)

Line voltage (circuit breaker)

OCS

cavity, no

b)

Fuses

PRO-1

display, when

c)

Cavity thermal cutout

PRO-2

the door is

d)

Thermal cutouts on all magnetrons

 

open

e)

Voltages on controller (DPU) board – if missing, check the low voltage

 

 

 

transformer