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Transistor power question


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#1 TG Racing

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Posted 11 November 2016 - 12:11 PM

I have a Difalco HD30 Genisis controller.  It was hooked up wrong and got very hot at the start of a race.  I quickly pulled it off.  Everything seems to be working ok but I'm losing power.  My times dropped from 4.2 to 4.3 and 4.4 (Retro Hawk Can-Am).  I have swaped out networks to no avail.  I borrowed a friends Difalco (pre Genesis) and my times went back down.  We tested his controller and mine w/ different cars and drivers.  Everything seems to lead back to my controller.  Is it possible for the transistor to loose power and still function?  Any ideas?  Thanks in advance!


Thom Greene




#2 slotcarone

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Posted 11 November 2016 - 12:27 PM

Is the relay still working for full power?


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#3 Half Fast

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Posted 11 November 2016 - 12:59 PM

I have had a Difalco working (somewhat) with a blown transistor. If the relay works, consider replacing it. 

Difalco sells replacement transistors, the instructions for installing it are on his website, its not hard.

 

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#4 TG Racing

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Posted 11 November 2016 - 03:08 PM

I think the blast relay is working.  I can here it clicking.  I think replacing the the transistor is the next step.  Thanks!


Thom Greene

#5 Paul5097

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Posted 11 November 2016 - 03:56 PM

It is possible that the contacts in the relay are burned or pitted. You will still hear the clicking, but if they are burned it creates resistance which causes a voltage drop. I would replace the relay too.


Paul Murr

#6 Tom Thumb Hobbies

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Posted 11 November 2016 - 04:02 PM

Thom, I think the amount of power you're loosing is more than can be attributed to dirty relay points. Change the transistor and your problem should be solved. 


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#7 Ramcatlarry

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Posted 11 November 2016 - 04:50 PM

Part of the Transistor circuit is a separate resistor on the board.  When the transistor is blown, that resistor is also showing a burn mark.  It may be damaged raising the value while not totally burned out....inspect for it and replace first...meter it.


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#8 drrufo

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Posted 11 November 2016 - 07:23 PM

Get a digital volt meter and check the value of the transitor. It should read over .500 v if it is any thing like the transistors that I used


John Andersen
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#9 Mike Patterson

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Posted 11 November 2016 - 09:39 PM

Have you tried communicating with Mr. Difalco? I have found him very helpful in diagnosing problems with his controllers.


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#10 JerseyJohn

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Posted 12 November 2016 - 06:16 PM

If you go to Jims web page he has instructions for replacement. That kind of injury would most certainly require the Trans and resistor on the board  replaced. 

 

Transistor replacement for Genesis 1/24 and 1/32 controllers (silver transistor).

1) Remove the nuts that hold the circuit board to the heatsink. While holding the heatsink down put opposite pressure on the circuit board as if you were pulling them apart. Then locate the transistor pins and quickly apply heat on one then the other pin and the assembly should come apart.

2) Check that the circuit board holes are clear of solder. If they are not then apply the iron to each hole and quickly tap the circuit board against a table to clear the holes of solder. You may also use an x-acto knife to clear the holes from the backside of the circuit board.

3) Make sure the white plastic spacers are still on the mounting screws. Check that the pins on the new transistor are very straight and parallel. Now lay the heatsink over the mounting screws then drop the transistor over the heatsink and the new pins should drop into the circuit board holes with a little side to side jiggle.

4) Install the nuts over the mounting screws, lay the heatsink on it's side and tighten the nuts very firmly.

5) Solder the transistor pins by quickly applying solder to the iron as you hold it at the pin and circuit board joint. Clean the solder joints with acetone or lighter fluid and an old tooth brush. (keep acetone away from the controller handle.

6) Check the resistor that is soldered in holes "D" and "H" to see if it has any black burn marks on the body of the resistor. If it looks fine you are done. If it has a significant black mark then replace it with the 10 ohm resistor in the kit.

 


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#11 TG Racing

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Posted 21 November 2016 - 08:05 PM

I got a new transistor to install.  Does it matter which pins go in the holes?


Thom Greene

#12 Eddie Fleming

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Posted 21 November 2016 - 08:08 PM

Yes!


Eddie Fleming

#13 Rob Voska

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Posted 22 November 2016 - 08:38 AM

Pins are offset so it will only bolt in the heat sink one way.


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#14 TG Racing

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Posted 22 November 2016 - 10:08 AM

Thanks Rob!


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