Panasonic NE1257R, NE2157R, NE1258R, NE1757R User Manual 2

Number: E10-2010-08

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Technical Bulletin

Panasonic Home and Health Company

Home Appliance Group / Food service

Product: Commercial Mircowave Oven
Model:

NE2157R

NE1258R NE1257R NE1757R

Date: September, 2010

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This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does
not contain warnings or cautions to advice non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technician. Any attempt to service or

air the product or products dealt with in this service information by anyone else could result in serious injury or death.

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Subject:

1. Check for proper grounding before troubleshooting.

2. Use caution when servicing high voltage circuit.

3. Discharge high voltage capacitors prior to servicing.

4. When checking for continuity of the switches or the high voltage transformer, disconnect one lead wire from these

5. Be sure to ground any static electricity charge built up in your body before handling the D.P.C. board.

6. 120/208/230V AC is present in the shaded area on the power supply circuit board (Terminals of the power relay and

Pro 1 Error Codes

parts and then check continuity with the AC plug removed. To do otherwise may result in false reading or may
damage your meter.

primary circuit of the low voltage transformer). When troubleshooting be cautious of possible electrical shock hazard.

NOTE: If the unit is either dead or displays any of the error codes listed below, check the parts listed in
possible cause column depending on failure indication e.g. F81, F82 in the display or no display (dead).

DISPLAY CONDITION POSS IBLE CAUSE (In order of probability)

1. Loose ground screw on the digital programmer circuit

F33 Open temperature sensor (exhaust)

F34 Short temperature sensor (exhaust) (Rare)

F44 1. Shorted m embrane switch
F01 Exhaust temperature exceeds 120° C 1. Burning food in the oven due to overcooking
F05 Memory failure 1. Digital programmer circuit failure

No Display* (Dead) No voltage supply to the LV transfomer

F81*

F82*

F86 Shorted contacts of RY-3

* Please see back of this page on how to troubleshoot F81/F82 error code or dead unit

F87 Shorted contacts of RY-4

Excessive current comsumption

(upper H.V circuit)

Excessive current comsumption

(

H.V. circuit)

lower

2. Loose connector CN4

3. Open temperature sensor (Should read 25k to 85k)

4. Digital programmer circuit failure

1. Digital programmer circuit failure

2. Temperature sensor failure

1. Right fuse open

2. Damaged short sw itch

3. Shorted H.V capacitor, transformer, diode or magnetron (upper)

4. Shorted L.V transform e r (Relay board)

5. Digital programmer circuit failure

1. Open primary latch sw itch

2. Relay failure RY-3 (Relay Board)

3. Digital programmer circuit failure

1. Left fuse open

2. Open primary latch sw itch

3. Damaged short sw itch

4. Shorted H.V capacitor, transformer, diode or magnetron (lower)

5. Relay failure RY-4 (Relay Board)

6. Digital programmer circuit failure

1. Relay failure RY-3 (Relay Board)

2. Digital programmer circuit failure

1. Relay failure RY-4 (Relay Board)

2. Digital programmer circuit failure

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