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Spacemaker XL 1800 runs but no heat

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Microwave Repair

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Starting to poke through the innards, the hood tco is open circuit. This should be less than an ohm?? And

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Old 01-15-2013, 09:09 PM
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Default Spacemaker XL 1800 runs but no heat
Model Number: JVM1850SH01   Brand: GE   Age: 5 - 10 years   

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Starting to poke through the innards, the hood tco is open circuit.
This should be less than an ohm??
And could this be the cause though it is not part of the H.V. components?

Edit 10 hours later:
Seems there are 4 TCOs and maybe the hood tco is the only one that is supposed to be open at room temp and close at some higher temp?

H.V. diode reads open both ways on my meter, maybe meter is a cheap one.
I put the diode in series with meter in Vac mode and ran house ac (120) through it. the meter read 66.7

The capacitor resistance runs up to OL (infinity) in about a second. each lead is infinity to case.

magnetron leads (filament leads?) read 0.7 ohm and each are infinity to case.


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Last edited by jgreene : 01-16-2013 at 11:14 AM.
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  #2 (permalink)  
Old 01-16-2013, 01:54 PM
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looking online, I see comments about this sort of thing probably being a bad magnetron and if so then replace the diode also. But no reason is given other than the part is old so might as well since it is cheap and the cover is off.

Does a failed magnetron stress the diode or vice versa?

Ideally I would only want the nonfunctioning part replaced, but if other parts have been compromised I'd like to know that also.
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