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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Panasonic Mcirowave Oven Problem
Panasonic Model NN6381A
I can always enter the power and the time settings. When I press Start, one of these three things happens: 1. The oven does not start and 88:88 appears in the dispplay 2. The oven runs for a few seconds, and then stops and 88:88 appears in the display 3. The oven runs properly What might cause this? Behavior #2 above makes me doubt that the keypad is the problem. To reply directly to me, replace all 'z' with 'a' in email address. |
#2
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"George" wrote in message ... Panasonic Model NN6381A I can always enter the power and the time settings. When I press Start, one of these three things happens: 1. The oven does not start and 88:88 appears in the dispplay 2. The oven runs for a few seconds, and then stops and 88:88 appears in the display 3. The oven runs properly What might cause this? Behavior #2 above makes me doubt that the keypad is the problem. To reply directly to me, replace all 'z' with 'a' in email address. Given that the 88.88 display comes up as a result of power failure, could you have an intermittent supply ?? (Power cord, plugtop, connection strip etc. etc. ) -- Regards ........... Rheilly Phoull |
#3
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Panasonic Model NN6381A
I can always enter the power and the time settings. When I press Start, one of these three things happens: 1. The oven does not start and 88:88 appears in the dispplay 2. The oven runs for a few seconds, and then stops and 88:88 appears in the display 3. The oven runs properly What might cause this? Behavior #2 above makes me doubt that the keypad is the problem. Try resetting the oven's SYSCON. Unplug and leave it that way for about 10-30 minutes. Plug it back in, set the clock, and then use it again. - Reinhart |
#4
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If all that does not fix the item then obtain a replacement controller
assembly. "LASERandDVDfan" wrote in message ... Panasonic Model NN6381A I can always enter the power and the time settings. When I press Start, one of these three things happens: 1. The oven does not start and 88:88 appears in the dispplay 2. The oven runs for a few seconds, and then stops and 88:88 appears in the display 3. The oven runs properly What might cause this? Behavior #2 above makes me doubt that the keypad is the problem. Try resetting the oven's SYSCON. Unplug and leave it that way for about 10-30 minutes. Plug it back in, set the clock, and then use it again. - Reinhart |
#5
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On my old Sears microwave, one day the display decided to give the 8's all
the time - found a bad electrolytic on the control board. Maybe you have one just on the verge that, depending on the humidity, maybe is close enough until the current draw goes up, then it goes over the edge. Just a wild thought. WT "George" wrote in message ... Panasonic Model NN6381A I can always enter the power and the time settings. When I press Start, one of these three things happens: 1. The oven does not start and 88:88 appears in the dispplay 2. The oven runs for a few seconds, and then stops and 88:88 appears in the display 3. The oven runs properly What might cause this? Behavior #2 above makes me doubt that the keypad is the problem. To reply directly to me, replace all 'z' with 'a' in email address. |
#6
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Wayne,
I had the same thought. If the DC voltage drops below reset threshold, then the unit will reset. Starting up the microwave likely creates a current draw and the power supply isn't retaining its voltage. You might be able to see this with an Oscilloscope across the low voltage DC power. Check for AC ripple and watch as you cycle the oven. Good luck! Bob "Wayne Tiffany" wrote in message ... On my old Sears microwave, one day the display decided to give the 8's all the time - found a bad electrolytic on the control board. Maybe you have one just on the verge that, depending on the humidity, maybe is close enough until the current draw goes up, then it goes over the edge. Just a wild thought. WT |
#7
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On Fri, 29 Oct 2004 07:38:40 -0500, "Bob Shuman"
wrote: Wayne, I had the same thought. If the DC voltage drops below reset threshold, then the unit will reset. Starting up the microwave likely creates a current draw and the power supply isn't retaining its voltage. You might be able to see this with an Oscilloscope across the low voltage DC power. Check for AC ripple and watch as you cycle the oven. Good luck! Bob Yes, this seems very reasonble. If I set the time-of-day clock, it will forget the time after the 8888 appears. I will take a look at the low voltage DC. Any suggestions as to how I open up the box to get at that? |
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