Panasonic NE-2180C, NE-3280 manual Troubleshooting Guide

NE-3280 / NE-2180 / NE-2180C

15 TROUBLESHOOTING GUIDE

CAUTION

1.Check grounding before checking for trouble.

2.Be careful of the high voltage circuit.

3.Discharge high voltage capacitor.

4.When checking the 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 a false reading or damage to your meter.

When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be open or the connector cannot be removed.

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

6.A 208-230V AC is present at the shaded area ( ) of the power supply circuit board (Terminals of power relays and primary circuit of low voltage transformer). When troubleshooting, be cautious of possible electrical shock hazard.

First of all operate the microwave oven following the correct operating procedures described on pages 4 of this service manual in order to find the exact cause of any trouble.

NOTE:

If the unit shows faulty symptom as shown below, check the parts listed in possible cause column depending on failure indication e.g. F81, F82 in the display.

[TROUBLE] Oven does not operate at all or oven does not start cooking. NE-3280

DISPLAY	CONDITIONS	POSSIBLE CAUSE	TIMING OF FAILURE INDICATION
F33	Open temperature	1. Temperature sensor failure	It is appeared when failure occured.
	sensor (exhaust)	2. Digital programmer circuit failure
		3. Loose connector CN5
F34	Short temperature	1. Temperature sensor failure	It is appeared when failure occured.
	sensor (exhaust)	2. Digital programmer circuit failure
F44		1. Shorted membrane switch	It is appeared 2 minutes after failure
			occured.
F01	Exhaust temperature	1. Burning food in the oven due to over cook	It is appeared when exhaust temperature
(With continuous	exceeds 120°C		exceeds above 120°C.
beep sounds)
F03	Input voltage exceed	1. Increase in power source voltage	It is appeared when the unit is plugged in.
	+ 12.5%		Note that it returns normal operation mode
			by tapping the STOP pad.
F04	Input voltage is less	1. Decrease in power source voltage	It is appeared when the unit is plugged in.
	than — 12.5%		Note that it returns normal operation mode
			by tapping the STOP pad.
F05	Memory failure	1. Digital programmer circuit failure
No display	1.25A fuse blown	1. Low-Voltage transformer failure
No display	1.25A fuse is OK	1. Thermal cutout failure
		2. Low voltage transformer failure
		3. Digital programmer circuit failure
F81	No voltage supply to	1. Relay failure RY-3 (A)	It is appeared when failure occured.
	high voltage trans.	2. Loose connector CN256, CN257
	(lower/left)
		3. Digital programmer circuit failure
F82	No voltage supply to	1. Relay failure RY-5 (B)	It is appeared when failure occured.
	high voltage trans.	2. Loose connector CN258, CN259
	(lower/right)
		3. Digital programmer circuit failure
F83	No voltage supply to	1. Relay failure RY-7 (C)	It is appeared when failure occured.
	high voltage trans.	Loose connector CN260, CN261
	(upper/left)
		2. Digital programmer circuit failure
F84	No voltage supply to	1. Relay failure RY-9 (C)	It is appeared when failure occured.
	high voltage trans.	Loose connector CN262, CN263
	(upper/right)
		2. Digital programmer circuit failure
F86	Shorted contacts of RY-	1. Relay failure RY-3 (A)	It is appeared when failure occured.
	3	2. Digital programmer circuit failure
F87	Shorted contacts of RY-	1. Relay failure RY-5 (B)	It is appeared when failure occured.
	5	2. Digital programmer circuit failure
F88	Shorted contacts of RY-	1. Relay failure RY-7 (C)	It is appeared when failure occured.
	7	2. Digital programmer circuit failure

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