View Single Post
  #5   Report Post  
Posted to sci.electronics.repair
Jon Elson[_3_] Jon Elson[_3_] is offline
external usenet poster
 
Posts: 1,148
Default Panasonic Inverter Microwave NN-SD-997S ...........

The_Fatman wrote:

On Fri, 06 Jan 2012 09:29:44 +0000, Arfa Daily wrote:


Maybe the "blue flash" from the internal light, was the bulb failing,


Thx for the reply, i opened up the chassis and there is a fuse on a small
circuit board at the upper rear right hand side of unit next to AC input.
This fuse didn't appear to be blown. (measured 0.5 ohm) I don't see any
obvious shorts or anything anywhere else around innards.....i've tried to
inspect the input leads to what appear to be 'door latch micro switches'
but they seem ok to me.

Well, most likely the tungsten arc in the bulb popped the solid state relay
that runs the light, fan, etc. These are probably set up to stay on after
the cooking is done, or maybe just to keep running when the duty-cycle
control of the magnetron is switched on and off. You can trace the power
to the fan motor and see if there is an obvious electromechanical or solid
state relay for this. It will be a LOT less expensive to get this through
Digi-Key or Mouser than $70.

Jon