The lightbulb in my Panasonic NN-T990SA microwave no longer turns on! I've had the more-than-reliabe microwave for the past six years; so I suppose it was time for it to burn out...the problem is, I called Panasonic and they say it's not "consumer servicable." You'd think for such an expensive microwave they'd put in a small bulb access panel to replace it, but they're telling me to send it to a local store for repairs.
Help! I'm highly tech savvy, and I'm thinking about opening the microwave case and replacing the bulb myself (since it's waaaay out of warranty already)
#1. Does anyone have any suggestions/tips to go about opening and replacing the bulb in this microwave?
#2. What do you think the fair price is that I should pay a service center to replace a bulb in a microwave?
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Re: Lightbulb no longers turns on!
They do this to avoid liability from your exposure to the instantly lethal voltages present in and generated by your microwave oven.
For important safety and disassembly tips, search on Yahoo.com (not Google) for all this at once (copy & paste):
microwave disassembly.txt safety.txt
The oven must first be disconnected from the power line.
The outer cover is held in place by several screws on the back and sides, then you lift up and back from the rear to remove it.
You need to avoid the sharp metal edges on thge cover and inside the oven.
Note there are also catches built into the top & sides of the cover which must be re-engaged upon reassembly, or the cooling efficiency will be compromised.
Once the cover's off, if there's any chance you might come into contact with any of the high voltage connections, the high voltage capacitor should be discharged for safety's sake.
Once the bulb is located, it can be unscrewed and replaced.
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I may be wrong on this model, but most microwaves need the top/side panels removed to get to the. Light. Afer removing the screws raise the back a couple of inches then slide cover towards the rear in order to slide the top potion out of its retaining clips. They do sometimes get stuck with food etc.
Howdy. Bad news; that is not a user-repairable part according to Panasonic. They recommend a local repair shop. I was going to send you the link to the manual anyway, (in case you are a hardcore DIY person) but that model is no longer supported on Panasonic's site. Sigh.
If you have any trouble locating a decent repair specialist in your area, I'd be happy to help out with that.
Farmerbear at FixYa.com
Usually this indicates failure of the magnetron and/or the inverter. Neither is easy to test without specialised HV equipment. Often the cause is operating the oven without anything in it. If this has happened, it will generally be failure of the magnetron.
Replacement of the magnetron is relatively easy (about 15 minutes) and the inverter a little longer but if you do not have the knowledge/skills please do not do it - there are very dangerous (deadly) voltages associated with magnetrons even after they have been switched off.
Cost of magnetrons ranges upwards from USD25 to USD100 (from Panasonic spare parts) and inverters range upwards from USD125. The cost of parts is often the reason microwave ovens are not repaired.