Re: 405DL Heat Motor Xistors

Leung, Steve (SLeung@SIKORSKY.COM)
Thu, 17 Jun 1999 14:15:58 -0400

I would not trust the peugeot manual that says it's a PNP transistor. I
would verify that with an ohmeter. Furthermore, I would not trust the pinout
of the replacement transistor being the same as the original unit(s).
Again, I would verify that by testing. Drilling and soldering should not
damage a power transistor. They can actually take quite a bit of heat.
What will destroy them is overcurrent (improper wiring). I have a lot of
electronics experience and could fix the board for you or anyone else.
--Steve

-----Original
From: Frank DeWitt [mailto:frank@lbpinc.com]
Sent: Thursday, June 17, 1999 1:23 PM
To: Peugeot List
Subject: Re: 405DL Heat Motor Xistors

I just finished the repair (replacement) of the heater fan control in my 405

I replaced the transistors with the radio shack units. (One transistor
checked bad (Shorted))

I went from always on to never on. I DO NOT think this is because the
Radio Shack transistors wont work. I think I blew it.

The job requires removing the fan unit (Easiest job on a Peugeot) Remove
the fan motor and cage from the unit (Not hard) and removing the ckt bd
from the plastic case (Not hard) but then it get's interesting.

The transistors are riveted in so they need to be drilled out. A good
solder sucker is required to unsolder the transistors. Between the
drilling and the high heat to unsolder the transistors I probably blew or
broke something.

I say all this to say that I think there is a real nice cottage industry
here for some one who is already a serious electronics hobbyist. With the
right tools and a home made test fixture it shouldn't take too much to
repair these boards. An alternative would be to design a new board and
just use the existing heat sink assembly. circuits abound for model train
and RC car speed controls.

It cost me $125 for a used fan unit so I certainly would have paid $75 for
a new control board.

If any one is interested I will send them my blown board as seed to get
started. Then you could sell them on an exchange bases.
Frank DeWitt | mailto:frank@lbpinc.com
Mechanical Design | Phone: 716 624 3052
LBP INC. | Fax 716 624 1038
2365 Cox Rd. |
Bloomfield NY 14469 |Web http://www.lbpinc.com

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