Mill refusing to power up

[Michael GilliganParticipant @michaelgilligan61133]

This might be useful sometime.

MichaelG.

[John RuddParticipant @johnrudd16576]

Michael,

I contacted KB directly and got an official copy of the KB series circuit diagrams….

Was a long time ago and I think they don't supply anymore…

Also have a copy of the install/setup manual

These docs have really been useful in my repair work for these boards….

Incidently, the Sieg X3 mill uses a very similar circuit for its speed control…..

[John RuddParticipant @johnrudd16576]

Michael,

I contacted KB directly and got an official copy of the KB series circuit diagrams….

Was a long time ago and I think they don't supply anymore…

Also have a copy of the install/setup manual

These docs have really been useful in my repair work for these boards….

Incidently, the Sieg X3 mill uses a very similar circuit for its speed control…..

[Sub MandrelParticipant @submandrel]

Just worth pointing out that my understanding is that the KB boards are marketed as 'made in the USA' ,. although many importers fit them to Chinese machines.

I have had two failures of Chinese speed controllers, neither being the fault of the board itself. One was shorted out by a loose controller box screw and replaced under warranty, the other was shorted out by along thread of swarf that reached all the way into the controller box.

Neil

[Gone AwayParticipant @goneaway]

Posted by Stub Mandrel on 14/01/2014 21:18:50:

…… the other was shorted out by along thread of swarf that reached all the way into the controller box.

Good thing you weren't hanging on to the other end by the sound of it!

[John RuddParticipant @johnrudd16576]

There are orig KB boards as fitted to some machines and then there the Chinese clones…….

the clones come I two flavours…the early ones used thru hole components while the later versions use smd technology…..in both cases the circuit is exactly the same…….

[Author]

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