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# Shop Fox Mini Lathe Circuit Board

#### tj107us

Apr 23, 2011
48
Hey guys, I have a Shop Fox lathe that has failed. To give you an idea of how it went down... I was using it pretty hard (probably past it's duty cycle) anyway I had it at full speed and then it slowed way down (like i had a large load on it) and then I turned it off. I took the circuit board cover off and turned it back on to see if i can smell anything getting hot!! I then shut it off cause it didnt want to burn it up and as soon as I turn it off, I saw a blue flash close to the transformer. So i'm thinking the transformer blew. How to you test a transformer to see if it is any good. It a FT2813-110-16DP transformer with 2 legs for input and 3 legs for out put. I ohmed out the input legs and it ohmed to 606 ohms, but dont know how many ohms it needs to be.

thanks for any help,
tj

#### john monks

Mar 9, 2012
693
I hope you know how to do this safely.
What I would do is place a 100 watt light bulb or an electric heater in series with the line cord and turn on the lathe. Then I would start probing around with a voltmeter.
I don't know the specifications of the transformer but if the light bulb does not light up and the output of the transformer is somewhere between 5 to 100 volts I would assume it is OK.

If I didn't know what I was doing I would get another lathe.

Last edited:

#### CocaCola

Apr 7, 2012
3,635
If I didn't know what I was doing I would get another lathe.

I don't know anyone that would toss an entire lathe out because of a failure like this, it's almost certainly cost effective to swap the failed part, as most all of them are very modular in design and made in the same factory in China so parts are plentiful...

What model is the lathe, most don't have transformers and if they do only a small one on the control board...

#### tj107us

Apr 23, 2011
48
Ok i ordered the transformer last night, i will let you know what happens when i receive it.

#### tj107us

Apr 23, 2011
48
well i got the transformer and installed it, and nothing still wont work!! So now im testing the caps. None are leaking or bloated but heard that they still can be bad. Is this statement true?

Aug 13, 2011
1,114
Yes, but it's likely a drive component failed.

#### tj107us

Apr 23, 2011
48
Yes, but it's likely a drive component failed.

So what would i need to check out now? Would the IC's be part of the drive component(s)?

Aug 13, 2011
1,114
I don't know; I've never seen your circuit board.

#### tj107us

Apr 23, 2011
48
can you test a bridge rectifier while still in the board?

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,505
Yes, but depending on the circuit you may get completely confusing readings.

A well lit (not flash) and focussed image of both sides of the board, allowing us to read component values and board markings would be very useful at this point.

I realise you've been asked this before, so I'll just add my voice to the choir.

#### tj107us

Apr 23, 2011
48
Hey i finally got it to upload the pics, sorry guys for taking so long to upload them. The rectifier is the black thing besides the transformer.

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#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,505
An image of the other side would be useful, but I would recommend removing the bridge rectifier to test it.

You could measure pairs of pins for an indication of diode action, but the results may be difficult to interpret, and surrounding circuitry may mask some problems anyway.

Take it out and if you have a diode test function try it both ways around from each ~ (call them ~1 and ~2) to both the + and - pin. That will be 8 measurements.

Give us a list looking like this perhaps:

~pin +/-pin red_on_~ black_on_~
~1 + 0.670 OL
~1 - OL 0.675
~2 + 0.001 0.001
~2 - OL 0.672

In this case the problem would be a shorted diode between ~2 and +, but that's not a prediction

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