Panasonic NE1258R Technical Bulletin

Technical Bulletin
Panasonic Home and Health Company
Home Appliance Group / Food service
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
repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
Subject: Pro 1 Error Codes
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
parts and then check continuity with the AC plug removed. To do otherwise may result in false reading or may
damage your meter.
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
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
F33 Open temperature sensor (exhaust)
F34 Short temperature sensor (exhaust) (Rare)
F44
F01 Exhaust temperature exceeds 120° C
F05
No Display* (Dead) No voltage supply to the LV transf omer
F81*
F82*
F86
F87
* Please see back of this page on how to troubleshoot F81/F82 error code or dead unit
CONDITION
Memory f ailure
Excessive current comsumption
(upper H.V circuit)
Excessive current comsumption
( H.V. circuit)
lower
Shorted contacts of RY-3
Shorted contacts of RY-4
Panasonic
Product: Commercial Mircowave Oven
Model:
NE1258R NE1257R NE1757R
NE2157R
.
POSSIBLE CAUSE (In orde r of probability)
1. Loose ground screw on the digital programmer circuit
2. Loose connector CN4
3. Open temperature sensor (Should read 25k to 85k)
4. Digital programmer circuit f ailure
1. Digital programmer circuit f ailure
2. Temperature sensor f ailure
1. Shorted membrane sw itch
1. Burning food in the oven due to overcooking
1. Digital programmer circuit f ailure
1. Right f use open
2. Damaged short sw itch
3. Shorted H.V capacitor, transformer, diode or magnetron (upper)
4. Shorted L.V transformer (Relay board)
5. Digital programmer circuit f ailure
1. Open primary latch sw itch
2. Relay failure RY-3 (Relay Board)
3. Digital programmer circuit f ailure
1. Left f use open
2. Open primary latch sw itch
3. Damaged short sw itch
4. Shorted H.V capacitor, transformer, diode or magnetron (low er)
5. Relay failure RY-4 (Relay Board)
6. Digital programmer circuit f ailure
1. Relay failure RY-3 (Relay Board)
2. Digital programmer circuit f ailure
1. Relay failure RY-4 (Relay Board)
2. Digital programmer circuit f ailure
Number: E10-2010-08
Date: September, 2010