Burl B2 Bomber Power Supply Repair

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Adam_C

Member
Joined
Jun 23, 2019
Messages
5
Hi everyone,

Been tasked with fixing the B2 Bomber at the studio and this is what I've been able to work out:

The MOV in the power supply board has blown (which explained the electrical burning smell when it blew up lol) and the fuse has also melted. I used a multimeter to test the pins from the main board to chassis ground and to see if any of the voltage regulators had an issue or the main board had a short in it but everything read fine on that end (confirmed by the guy I've been contacating at Burl).

Our accountant at the studio is unsure about ordering the new power supply since with US shipping and taxes the whole thing will cost around £100 so I was wondering if I could get some advice on sourcing the parts/if there's anything else that might be wrong?

The MOV looks like it's labelled (?)V07K and a 300. There are some other things written on it but can't quite make it out so I've attached a picture. I'm struggling a little to find this part as it turns out Burl don't actually produce the power supply themselves and therefore don't have a schematic or parts list. The fuse says t2al250v so that's an easier find.

This is my first time properly applying any electronics knowldege I have to a real situation so apologies if this is very basic!

Thanks :)

 

Khron

Well-known member
Joined
Apr 8, 2010
Messages
1,974
Location
Finland
https://datasheetspdf.com/pdf/791451/ITG/V07K300-5/1

MOVs do "wear out" in time, since by virtue of their way of absorbing voltage spikes, they "break down" bit by bit. But the labeling is pretty standard and borderline intuitive, and they're not all that "esoteric" as far as components go.

Keeping the voltage rating the same (300VAC in this case), going up in physical size (as space allows) won't hurt at all.
 

Adam_C

Member
Joined
Jun 23, 2019
Messages
5
Khron said:
https://datasheetspdf.com/pdf/791451/ITG/V07K300-5/1

MOVs do "wear out" in time, since by virtue of their way of absorbing voltage spikes, they "break down" bit by bit. But the labeling is pretty standard and borderline intuitive, and they're not all that "esoteric" as far as components go.

Keeping the voltage rating the same (300VAC in this case), going up in physical size (as space allows) won't hurt at all.

Thanks very much for your response! Understood, I think this is the guy: https://uk.rs-online.com/web/p/metal-oxide-varistors/7606964/
Will get it ordered, thanks again!
 

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