Reply to "Smoke unit doesn't chuff"

Vernon BarryOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

I just found an email I sent to a friend on these Lionchief "legacy" smoke unit repairs.

After examining your failed board with a magnifier, I saw the blown transistor that controls the fan. You can only see it with a magnifier, but there is a hole burned right in the middle of the chip blown out from the inside. It's marked "Y1" and double checked (since the marking was partially damaged when it burned) on the "B" unit good board.

Anyway, Y1 happens to be the same 8050 transistor Lionel and MTH uses in a ton of accessories- just surface mount size VS TO92 through hole size.

SS8050 TRANSISTOR (NPN) FEATURES Complimentary to SS8550 ...https://jb8a8f8.com/support/index.php?attachments/q200-q001-q501-q401...y1...

So next time- we know what the failure is. I think this happens on these Lionchief plus boards if the fan motor binds in the slightest, it draws more current and blown the transistor.

I have one in the kit I got from amazon.

https://www.amazon.com/gp/product/B07FMXH3XH

10/7/199:00 PM

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