John Miles wrote:
> Yes, I don't think a broken oven controller is going to pull the frequency
> off by 890 kHz. :-)
>
> -- john, KE5FX
>   
If the oscillator is oscillating in an undesired mode, then it is likely
that the mode suppression network
(C5, C6 L2, L3 in the schematic) in the oscillator has a faulty
component or maybe a dry joint.
It probably worthwhile to check all the frequency determining components
in the oscillator at the same time.
You'll need to disassemble the oscillator to check.

Bruce

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