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05-10-2017, 06:31 PM
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#1 | ||
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Regular Member
Join Date: Jun 2005
Posts: 237
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So i just put a new motorolla transister onto my speed controller to find that the fan still blows when the car is off.
only difference is now its flat out and i cant slow it down when the car is going. when you look at the inside of it, there are the two metal ribbons soldered onto the legs of the motorolla transistor and a third one, that looks like a ground / earth. should this earth to the body of the unit?? or go onto the screw that goes through the transistor, which would insulate it? also, are these controllers available new or reco anywhere? thanks |
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05-10-2017, 07:52 PM
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#2 | ||
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Cranky old bastard
Join Date: Dec 2004
Posts: 9,394
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Did you search the topic as a couple of threads are on this.
https://fordforums.com.au/showthread.php?t=11319441 https://fordforums.com.au/showthread...56#post5302456
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"But really...what can possibly go wrong" 
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05-10-2017, 09:27 PM
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#3 | |||
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FG XR6 Ute & Sedan
 Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,518
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Quote:
Yes; and the image here from the 1st thread probably answers the question. You also need to use the proper transistor mounting kit to insulate the transistor from the metal case.  Also check you have not put the new transistor in back to front; it's actually easier to put it in that way than the right way but it won't work correctly.
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regards Blue Last edited by aussiblue; 05-10-2017 at 09:42 PM. |
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13-10-2017, 07:37 PM
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#4 | ||
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Regular Member
Join Date: Jun 2005
Posts: 237
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looks like ive done it correctly, nothing shorting out.
tried another one from another car.... same bloody thing, fan going flat out when car is on or off. could it be something else?? |
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13-10-2017, 09:28 PM
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#5 | ||
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Regular Member
Join Date: Jun 2005
Posts: 237
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ill give the second one to an electronics shop to fix. that way i know its done right.
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13-10-2017, 11:41 PM
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#6 | ||
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FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,518
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No chance you have the base and emitter terminals mixed; it easy to as the solder connections are actually easier when you mistakenly cross them over.
 
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regards Blue |
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13-10-2017, 11:57 PM
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#7 | ||
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FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,518
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Also check the fan/blower motor plug hasn't shorted. Follow the 2 wire cable from the fan speed controller to the fan and unplug the connection and check integrity of the plug and socket and inspect the inside of the plug and socket.
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regards Blue |
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14-10-2017, 12:11 AM
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#8 | ||
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FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,518
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I assume you used a new mica or silicon rubber thermal washer and bolt insulation kit and heat sink/thermal grease (under the thermal washer) with the new transistor
http://www.altronics.com.au/p/h7100-...tion-kit-pk-4/  or https://www.jaycar.com.au/to-3-silic...-pk-4/p/HP1172   
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regards Blue Last edited by aussiblue; 14-10-2017 at 12:28 AM. |
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14-10-2017, 12:23 AM
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#9 | ||
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FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,518
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These are also handy to stop the crap that fall in the vent corroding the transistor case:
 or 
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regards Blue |
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14-10-2017, 09:28 AM
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#10 | ||
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Regular Member
Join Date: Jun 2005
Posts: 237
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i used the existing plastic insulator. about to get a multimeter and test to see if thats shorting. got some new ones, so ill try them. thanks for all the help
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14-10-2017, 09:29 AM
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#11 | |||
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Regular Member
Join Date: Jun 2005
Posts: 237
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Quote:
edit... oh you can mix it up on the inside though.... ill check that too |
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14-10-2017, 10:49 AM
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#12 | ||
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Regular Member
Join Date: Jun 2005
Posts: 237
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found the issue!!!
the smaller black transistor thing inside with the 3 legs, was missing a tiny little pad from under it which insulates it from the main body! so easy to miss this. its about half a cm square and as thin as paper. happy now!! |
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15-10-2017, 12:29 PM
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#13 | ||
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XR6T BA 2002
Join Date: Apr 2011
Posts: 683
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Cool thread
So are you going to run your fans at full speed ?
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XR6T 2002 BA
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calling au fan speed controller gurus
Linear Mode
