• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake
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Bosch Microwave sparking at door - HMT5050/02

BoschHaver

Premium Member
Joined
Mar 2, 2022
Messages
2
Location
USA
Model Number
HMT5050/02
Brand
Bosch
Age
6-10 years
Hi - I have a Bosch HMT5050/02 that started sparking/arcing at interface between the door and the face of the microwave (pics below). I don't know what caused this originally, but it seems that now the enamel has been burned off at this location, which is suspect is likely to make the arcing problem worse. Is there any way to fix this? Can I paint a bit of nail polish or other enamel paint (or maybe an epoxy?) on these surfaces to help prevent arcing? Or is this microwave shot? Thanks!
 

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Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
5,646
Location
Ontario, Canada
Maybe something got jammed in there once and chipped the surfaces causing the arcing? If you clean up the spots and touch up the surfaces I think it should be ok. Just make sure the door isn't cooked and hitting at that spot.

LINK > Microwave Cavity Touchup, White

LINK > Black Touchup

I'm not certain how close the black colour will be. There are a number of different shades of black used by manufacturers.

JFYI

Dan O.

* Edited link to black touchup.
 
Last edited:

BoschHaver

Premium Member
Joined
Mar 2, 2022
Messages
2
Location
USA
Thanks Dan! I think the little "weld" marks are causing contact between the door and the frame - can I file/sand down the lttle ridges so they're smooth and then paint over?
 

Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
5,646
Location
Ontario, Canada
BoschHaver said:
I think the little "weld" marks are causing contact between the door and the frame

Actually, I think you have that backward. Microwaves will spark between 2 conductive surfaces. Either the surfaces were chipped before and the microwaves arced between them resulting in the burn marks and subsequent damage or there was something between those parts, facilitating the contact and causing the arcing. Hence my suggestion to check the door alignment which might have originally caused the chips, which eventually resulted in arcing.

BoschHaver said:
can I file/sand down the little ridges so they're smooth and then paint over?

Yes. That should be all that is necessary to correct damage to the finishes.


Dan O.
 

Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
5,646
Location
Ontario, Canada
Sorry. I just realized the link to the black colored touch-up was wrong. I've updated the original link to point to the correct destination. Sorry.


Dan O.
 
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