Hi Mike - Sorry can't help you but I'm interested in case the same thing pops up with my T4. It's just possible that Trend may not even be able to help either. So many companies these days just farm components like a circuit board out with just performance and physical size specs and the design is done outside.
Good Luck

 

Failure of this board was fairly common at one point and I have hopes that someone with a little more electronic experience has figured out the board and can give us some answers. Otherwise, a replacement board is available, but there are so few components on it, it is easy to replace parts if you know what they are.

Mike

 

If you can't fix it, just hook it to an external speed control. That won't help with the soft start but the router will be functional at least.

 

It may be this one ? 5KP110A 5000W 110V Transient Voltage Suppressor Diode. ? If so ebay 110v diode | eBay

I was in repair for 50 yrs lot's of diode's for different apps. ? It is probly a ziner diode to keep voltage at 110 ?? The band on the diode went to ground ?

 

This is a very small (about as small as I've ever seen one) blue-colored component about 2x as thick as the wires coming out of it and it has a label of C702 printed on it along with a band at one end. Searching for C702 on the internet hasn't helped one bit.

It is connected to feed the gate of a T151 SCR.

Mike

 

Hi Mike - A "C" designation on a circuit board is usually indicative of a capacitor. The 702 is probably a numeric reference to a component number on a schematic somewhere. The question then becomes the capacative value and the polarity. I believe the band would indicate the positive (+) terminal. Can you make out any other numbers?
The good news is I believe it is a very common component and should be easily secured once the values are determined.

 

I messaged Harry to jump in on this one. I think he has one of these routers and is pretty good on electronics.

 

Hi Mike, I'm not familiar with your router and have only ever repaired one tool speed controller in my scroll saw, BUT, I've repaired numerous touch control light dimmers, I even started such a thread: http://www.routerforums.com/lobby/12826-how-repair-touch-lamp-etc.html
I don't ever remember seeing such a diode.The original device is a triac whereas you have fitted an SCR, which doesn't contain the internal diode that the triac does for bi-directional firing. Because of the tiny size of the diode, I'd be inclined to try a small signal diode or possibly two in series. Let's face it, there's no way that you can damage the router itself. I hope this is of some help Mike.

 

The original device is a triac whereas you have fitted an SCR, which doesn't contain the internal diode that the triac does for bi-directional firing.

I found the tech sheets for both the T151-500R and the NTE5558 and both are called 'passivated SCRs. Main difference (other than manufacturer) is the T151 is 500V and the NTE5558 is rated to 800V and is 6x more expensive.

I also found an application note that shows the T151 in a similar circuit to the T4's circuit and D2 in the 3rd illustration on the PDF page I printed and attached is the little jewel in question. The actual circuit in the T4 is more complicated, but R1, D2, R4 and BT151 seem to be exactly as drawn on the pdf page.

The 'diode' is physically destroyed while taking it out and what I thought was a band on one end isn't really there. I suspect the 702 is the end numbers of the diode but don't have a clue why there is a 'C" in front of it.

Mike

 

On the road for about a week at the moment. Will attempt to reverse-engineer the PC board when I return next week.

Data sheets???

Thanks,
Mike

 

Dear Sir,

Please be advised that Trend takes any and all warranty issues with our products seriously. I have checked our our customer service department and no one is aware of a recent problem with a circuit board. Perhaps your are using contact number/e-mail from our headquarters in Kentucky which closed in December, 2009?? Please do contact us at (877) 918-7363 or you may e-mail us at technical@trend-usa.com.

We look forward to hearing about your problem.

Thank you,

Jamie

 

Mike,

We are here to help if you are in need of assistance. My concern was that you stated that Trend does not reply. Please do contacvt us in the USA as we pride ourselves on customer service and we will do what we can to address customer service issues.

Thanks,

Jamie

 

Jamie,

Sent a PM to you.

Mike

 

I think that we all await the result with interest.

 

Update



Just a quick update. I'm back home now and yesterday sent email to Trend support requesting a schematic of the pc board. Received a 'wire diagram' of the router setup (not a schematic of the pc board). However; after an exchange of emails, my request for a schematic has been forwarded to a "Trend UK technical office" - but the really good part is a pc board is on its way as of today.

Once installed, I will feel more comfortable tearing into the bad pc board - it has a black epoxy covering some of the components making it difficult to figure out.

Mike

 

parts

NTE5558 is only couple dollars more than the control board!

Trend T4 Router Spare Parts | Miles Tool & Machinery Centre(cant post link!)

However, don't know if they ship to USA!

 

NTE5558 is only couple dollars more than the control board!

Trend T4 Router Spare Parts | Miles Tool & Machinery Centre(cant post link!)

However, don't know if they ship to USA!

Looks like may be $20-$25 plus shipping. Sent them a note to ask. Couldn't find a US site with the pc board as a part.

Still would much rather have the schematic with parts designations so as to repair quickly.

Mike

 

Reply from Miles says they don't ship to the USA.

Mike

 

Hi

Why not just remove or by pass the control device and use the item below, you could call it a ext.cord with a switch on it..

Don't make things harder than they need to be..

Router Speed Control

=======

 

Mainly because it says "Will not work with soft- or slow-start motors."

And if you have used a slow-start router, you will not want to give up that feature.

I use one on an old Makita D-handle workhorse and it's fine for that one, but I really like a slow-start feature.

Mike

 

Great to see some brands that back their product.

Being on this forum may have helped as many thousands of members and non members would be watching with interest...

 

A good outcome Mike, for Trend, it's very cheap advertising, considering how many members we have here.

 

Fixed!

New circuit board arrived in today's mail and the T4 is back to normal operation. Can't say enough about the service support from Trend!

Now, if they would only respond with the schematic I requested....

Mike

 

I'd take bets that they don't have a schematic, a faulty board gets replaced, Their landed cost probably from China would be peanuts. I base this on the fact that today I ordered from China a hard drive A/V recorder with a 1 Tb hdd, 8 A/V inputs, plus SIX colour day/night cameras, plus SIX mains plug packs, plus SIX 20metre power/A/V cables. The cost including postage via Hong Kong post?........................................$A106.00!!!!!!!

Edit: I've just remembered it also has 2 x USB ports and supports VGA. 2 cameras are dome type and 4 are weatherproof, each contain 22 LED's