What is it?

[Teflon]

I had an older model Dremel (260) rotary tool throw a brush, which
shorted out and fried the switch assembly. Repair parts are no longer
available for this model. I can replace the slide switch, but
replacing the 3/4"x1/2"x1/4' black electronic component that is part
of the switch assembly, wired-in between the slide switch and the
motor brushes, is a problem.

I don't know what it is or what it does, but I took it completely out
of the circuit, tested across the two inputs with an ohm meter, and
got a solid connection, which I don't think should be the case.

If I could find a current day replacement for this component, I think
I could revive this tool.

The mystery component has KBP04-1 printed on one side, with (+ AC
-) printed underneath it, then 7237 is printed on the other side.

I'd also like to know what it is and what function it serves.

Would it be possible to wire directly from the motor brushes to 120V
and have the motor work?

I would plug it in to a light dimmer switch to control off/on and the
speed.

 

[Brendan Gillatt]

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Teflon wrote:

I had an older model Dremel (260) rotary tool throw a brush, which
shorted out and fried the switch assembly. Repair parts are no longer
available for this model. I can replace the slide switch, but
replacing the 3/4"x1/2"x1/4' black electronic component that is part
of the switch assembly, wired-in between the slide switch and the
motor brushes, is a problem.

I don't know what it is or what it does, but I took it completely out
of the circuit, tested across the two inputs with an ohm meter, and
got a solid connection, which I don't think should be the case.

If I could find a current day replacement for this component, I think
I could revive this tool.

The mystery component has KBP04-1 printed on one side, with (+ AC
-) printed underneath it, then 7237 is printed on the other side.

I'd also like to know what it is and what function it serves.

Would it be possible to wire directly from the motor brushes to 120V
and have the motor work?

I would plug it in to a light dimmer switch to control off/on and the
speed.

I suppose it could be a thyristor. I found
http://www.cedelettronica.com/ita/catalogue/productDetail.aspx?category=2DDP&idmaster=1612
while searching 'KBP04-1'. Is that the component?


- --
Brendan Gillatt
brendan {at} brendangillatt {dot} co {dot} uk
http://www.brendangillatt.co.uk
PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
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[Tom Biasi]

"Teflon" <spambaitmeister@gmail.com> wrote in message
news:1193775888.273409.48830@q5g2000prf.googlegroups.com...

I had an older model Dremel (260) rotary tool throw a brush, which
shorted out and fried the switch assembly. Repair parts are no longer
available for this model. I can replace the slide switch, but
replacing the 3/4"x1/2"x1/4' black electronic component that is part
of the switch assembly, wired-in between the slide switch and the
motor brushes, is a problem.

I don't know what it is or what it does, but I took it completely out
of the circuit, tested across the two inputs with an ohm meter, and
got a solid connection, which I don't think should be the case.

If I could find a current day replacement for this component, I think
I could revive this tool.

The mystery component has KBP04-1 printed on one side, with (+ AC
-) printed underneath it, then 7237 is printed on the other side.

I'd also like to know what it is and what function it serves.

Would it be possible to wire directly from the motor brushes to 120V
and have the motor work?

I would plug it in to a light dimmer switch to control off/on and the
speed.

Its a very common failure in that device. You could do as you suggested and
control the speed externally.

Tom

 

[PhattyMo]

Tom Biasi wrote:

"Teflon" <spambaitmeister@gmail.com> wrote in message
news:1193775888.273409.48830@q5g2000prf.googlegroups.com...
I had an older model Dremel (260) rotary tool throw a brush, which
shorted out and fried the switch assembly. Repair parts are no longer
available for this model. I can replace the slide switch, but
replacing the 3/4"x1/2"x1/4' black electronic component that is part
of the switch assembly, wired-in between the slide switch and the
motor brushes, is a problem.

I don't know what it is or what it does, but I took it completely out
of the circuit, tested across the two inputs with an ohm meter, and
got a solid connection, which I don't think should be the case.

If I could find a current day replacement for this component, I think
I could revive this tool.

The mystery component has KBP04-1 printed on one side, with (+ AC
-) printed underneath it, then 7237 is printed on the other side.

I'd also like to know what it is and what function it serves.

Would it be possible to wire directly from the motor brushes to 120V
and have the motor work?

I would plug it in to a light dimmer switch to control off/on and the
speed.


Its a very common failure in that device. You could do as you suggested
and control the speed externally.

Tom

Marked with "+" "AC" and "-" ? sounds kinda like a rectifier to me?
KBP04 sorta sounds like a bridge rectifier PN to me..

http://www.ortodoxism.ro/datasheets/dccomponents/RS203.pdf

Looks like a common single phase bridge rectifier to me.