What Do I Do Now?

tubeguy

Joined Nov 3, 2012
1,157
Great find patricktoday! Looking at the partial schematic It looks like the burned part near the large diodes is what you need. It's probably an NTC in-rush current limiter. There's a site with a calculator for those - don't have it handy. Check back.

TVS2 on the schematic...
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
The large black capacitor. To know the connection to the transistor would mean eventually we can figure out about it's technology (PNP or NPN).

PNPs normally are connected to +/Vcc, and the load is between the transistor and ground.
NPNs connect the load to ground, while it is connected to Vcc.

From the rectifier I do not think there is more than 3A permanent current.

Can you order components from Farnell? They have many power transistors. Or do you use eBay? They are often more expensive on eBay.

Don't try to desolder the power transistor, so-called via's are easily destroyed by this. Simply cut it off, it is no problem to solder on top of the wire remains.

The pin on the left side would be the base (the others have thicker traces).

It is also possible they use a SCR or Thyristor here, don't know about the schematic.

More likely, I guess it is a PWM regulator. Can you read anything on the IC on the right side?
The transistor is connected to the negative.
If Farnell accept paypal and deliver to Ireland then I can use them. In noral circumstances I would use ebay

Okay, good to know as I would have actually tried to desolder it.

IC says PIC16F684

Thanks
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
The "transistor" shorted or not wouldn't likely be connected across the motor.
It appears from the pictures the diode may be connected across M+ M-
but it's hard to tell for sure.
You said the diode test's good - what are the two meter readings?
0.416 and 0.417
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
Here's the same board, I think, and a partial schematic, hand drawn:
http://mio.discoremoto.alice.it/dzaru

It's missing the two key components, of course ;)

The website is odd you may have to reload a few times. Here's the linking page:
http://elettronica.plcforum.it/index.php?/topic/5695-misurare-igbt/

HTH
Fantastic find. Thanks a million for that. How did you manage to find it? When I googled the PCB part number I only got a page about a Raleigh treadmill which didn't answer any questions
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
Here's in-rush limiter info:
http://www.ametherm.com/inrush-current/#Inrush-Calculator

Looking at the partial schematic, it's curious that you get 0 ohms across the motor terminals. Is your meter able to read low ohms accurately ?
I had been testing in volts while it was connected to mains.
On 200K ohms mode without being connected to mains the motor terminals read 120 and keep on climbing slowly.
Thanks
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
Here's in-rush limiter info:
http://www.ametherm.com/inrush-current/#Inrush-Calculator

Looking at the partial schematic, it's curious that you get 0 ohms across the motor terminals. Is your meter able to read low ohms accurately ?
The TSV was completely smashed when I opened the board for the first time. It was not possible to read part numbers off it. The scumbags who made this board either wiped off the part numbers or colored over them with a marked.

What do you think would be a suitable replacement TSV part.

And do you still think I need to remove the transistor or should I see how I get on with a new TSV first

My motor is different to the one in the diagram.
Mine is: 1.5 HP
4000 RPM
CW Rotation
180 Volts
7.5 AMPS

I removed the transistor and I am not getting any readings for it using the multimeter

Thanks
 
Last edited:

takao21203

Joined Apr 28, 2012
3,702
The transistor is connected to the negative.
If Farnell accept paypal and deliver to Ireland then I can use them. In noral circumstances I would use ebay

Okay, good to know as I would have actually tried to desolder it.

IC says PIC16F684

Thanks
The device might be an IGBT, see the forum (Italian language). I have not tried to translate it. You could look up the type # supplied and see if it looks the same.

Yes, http://ie.farnell.com

They do deliver to Ireland within 2 days + no shipping charge. From the UK. Very satisfied with them, absolutely professional seller.
 

Thread Starter

tcawley29

Joined Jan 23, 2013
47
The device might be an IGBT, see the forum (Italian language). I have not tried to translate it. You could look up the type # supplied and see if it looks the same.

Yes, http://ie.farnell.com

They do deliver to Ireland within 2 days + no shipping charge. From the UK. Very satisfied with them, absolutely professional seller.
The PIC is responsible for turning on the relay, which it does so thats not the problem.

Great. Do you know which TSV I should buy and which transistor I should buy. I am 100% certain that they are dead.

Thanks
 
Last edited:

sean wex

Joined Mar 11, 2013
5
hi i have a t1700 also, cannot get parts either, was looking at my board and the component is gone i will put up pic tomoro i have writing on my component , lookin forward to seeing if this can be sorted
 

sean wex

Joined Mar 11, 2013
5
camera dodgy but reading on my ntc inrush limiter says TL10 and underneath says UEI005 any ideas what bottom line means? would SL range be the same?
 
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