Any one know were I can buy one of these speed control boards

It does not matter. posting pictures is to much of a chew on.

universal-steuerplatine-platine-jymc-220b-i-12v-ac-speed-controller

Edited By JasonB on 20/09/2016 19:46:37

I think I have sussed it. Any one know were I can get one of these boards. OOps double post.

Edited By Dave Harding 1 on 20/09/2016 19:47:23

That looks like the Chinese equivalent of the KB board

It's fitted to a variety of small machine tools so would help if you said what it's off as there are different power ratings.

Probably his SPG

KB clone.....

Can be repaired...

Edited By John Rudd on 20/09/2016 20:54:13

It's off my lathe the speed control is u/s. The motor just runs flat out.

Can you post up details from the label on the heatsink?

Speed control pot that has gone can give similar symptoms

The details on heat sink label are.

DC Motor Speed Control.

Model JYMC-220A-l. Input 230VAC-50/60 HZ. Output 0-180VCD. Rated 6.0. ADV.

Yanzhou Jiayi Mechano-electronics institute. High pot tested.

What's a speed control pot.

The control on your machine that varies the motor speed as you turn it cw or a/cw.

If the control has no effect and the motor is running flat out, then there are a number of possibilities that could cause this, a fault on the board itself/wiring to from the speed pot/the speed pot....

The board you describe is a typical unit produced by the Chinese based on the design by KB electronics in Florida USA....

Im still looking but I have not been able to find a supplier. So my lathe is kaput.

Are you sure that an equally rated board of different manufacture wouldn't suffice the job of powering your motor?

Michael W

Dave, It may be worth removing the PCB from the heatsink and check for dry joints. The joints to the high wattage resistors are a common problem as they get hot. Poor contacts on the push on connectors can also get hot and cause the solder joints to degrade. Also look for any sourch marks on components. Can't see any on the photos though.

Hugh

I can not find a board anything like it on any of the suppliers web sites. I had a look on ARC euro none of there components look anything like it.

I have done google searches to no avail. A company in America does them but that is no use to me.

I have jobs stacked up but no lathe to do them with. I should of bought a Myford. As they say once bitten twice shy up to now my model engineering experiences have been not good to say the least.

I am thinking a different hobby might be prudent cheaper and more rewarding.  If I can not fix it  I will be not buying another.

Edited By Dave Harding 1 on 23/09/2016 00:38:04

I am curious about the dark spot on the side of, R 23 and the track running out from under it to the transistor .

Is that dark spot a shadow or a char mark from a blown transistor and the track that runs to it looks like it has fried the protective lacquer .

If you cant find a direct replacement maybe take it to some one who knows how to repair it , some electronics / tv repair shops do odd jobs or fit a board from a different machine , as long as the replacement if of equal or higher watt rating and same voltage rating it may be possible to fit it to your machine .

If you think model engineering is expensive or not rewarding try target shooting ! Constantly paying for ammo , targets, fuel , accomodation etc etc then days or even weeks of preparation to lose a match because of a gust of wind !

Don't get me started on golf !

Dave,

If theres one thing i've learned whilst doing this, that is there is hardly anything that is totally beyond all hope of repair with a little bit of courage and perhaps improvisation at times.

For when my own mill motor gave up, i didn't just dump the mill or even buy a new motor/speed controller, but fashioned an entirely new set of fixings and used my old lathe motor and VFD, that was sitting spare and not broken, i admit, when the gears broke, i made some new ones with a vertical slide on the lathe. I didn't necessarily buy my way out of the problem. There have been quite a few authors who have championed the cause of the D.I.Y workshopper, operating out of our garages, porches or even kitchen worktop, (god forbid you machine brass and cast iron on there!)

I know i could be decried by many but there are literally page loads of speed controller circuit boards you can buy on ebay, you might have to wait for china post, but if you manage to find a speed controller thats the same as yours, a £10-15 risk is definitely worth opting for, if you can fix it, yes?

I wouldn't be quick to discredit your modern import manufacture lathe, alot of myfords have been round a long time and can be quite costly to repair, the spares are eyewatering and the refits even more so. It is precisely because they were popular and have become so religiously revered that their prices have soared to frankly barmy heights. You could argue their decision to stop making machines and start supplying spares was a conspiracy to allow the ones in circulation to skyrocket and make more money from making mere spares rather than value-capped whole machines. 

Michael W

Edited By Michael Walters on 23/09/2016 03:05:14

http://www.befr.ebay.be/itm/Universal-Steuerplatine-DC-Motor-Speed-Controller-JYMC-220A-I-6ADC-230V-/262178783404

appears pretty close...

i also noted on ebay a US repairer... Shipping to/from US is not likely to be that expensive, and probably only a couple of days each way.

-russ (from Oz)

Silly question but have you tried Simon at SPG ?