Date:         Wed, 22 Jan 2003 07:49:48 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Diagnosing Idle stabilizer
Comments: To: RAlanen@AOL.COM
In-Reply-To:  <18.2b96f2c5.2b5fd495@aol.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 06:03 AM 1/22/2003, Frank Condelli wrote:
>problem was.  The transistor the electronics store gave me as a cross
>referenced replacement was a NTE 332.  All I know the motor ran with the
>burned transistor but had idle stabilisation problems and the motor would not
>run at all after changing the transistor.  I am now using a used newer model

Ok, the Motorola BD438 PNP silicon (4-watt) power transistor pinout is ECB,
looking at the printed side, left-to-right, leads pointing down.  C and B
appear to be slightly closer together.
http://onsemi.com.cn/pub/Collateral/DataSheet/bd438rev7.pdf

And the NTE332 is BCE...so it definitely needs an attitude readjustment.
http://www.nteinc.com/specs/300to399/pdf/nte331.pdf

You may or may not have wrecked the replacement -- or possibly other things
on the board.


Incidentally (or not) NTE lists the NTE185 as the proper cross for a BD438
-- and its pinout is pinout is ECB, like the Motorola.  It's also in a case
that's a much closer match, no heat sink sticking out of the top of the
case.  I didn't look at the electrical specs of any of them.
<http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/5f94e45f99cb39c785256a8400531fe4?CreateDocument>
<http://www.nteinc.com/specs/100to199/pdf/nte184.pdf


david


--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"