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I have a 30-1137-1 Steam Loco with PS1 from 1998 that has a smoke unit that has quit.  As near as we can tell the smoke resistors are fine and the smoke fan motor works.  It just stopped, no fanfare, no warning.  I am at odds with my BF that the smoke unit is controlled from the PS1 boards.  I have checked the smoke unit switch, making sure it was on, repacked the wick and made sure there was suffiecient smoke fluid.  No joy.  Any thoughts?

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The PS1 smoke unit just receives track power and runs.  The one in the GS-4 that I'm currently upgrading was just wired directly to the track pickups through the smoke switch, no control from the PS/1 electronics.

 

You can unplug the input power connector (NOT the fan connector) and put 12 VAC from a transformer directly on the smoke unit.  If it doesn't work at that point, I'd suspect the regulator on the smoke unit board, or perhaps one of the other components.

Charly,  There is a small Full Bridge rectifier on the board.  Small square about 3/8".  It takes AC input and makes DC.  If you trace the wires feeding the smoke unit that is the AC in.  The other 2 pins on the rectifier are + and negative DC out.  Measure the output.  I imagine it has no output.  That prevents the fan motor regulator and the heating elements from getting an input.  That can be removed and replace.  The PS-1 kit has those regulators in.  I have some and can mail you one if you isolate that as the problem.  G

Josey, I couldn't find a similar "deal" on eBay for the DF04 but auction # 120925432518 gets you a suitable part (has higher voltage rating which is fine) qty 5 for $2 with free shipping but from Asia so 2-3 week wait.  Or I recommend DigiKey.com in the US where the DF04 is 45 cents each.  Specify USPS First Class shipping which will be about $3 and DigiKey ships same day so you get it in a few days.  Given the shipping cost, you might want to pick up other parts such as the 78L05 fan regulator ICs at 30 cents each, diodes, LEDs, resistors, or whatever's on your shopping list...

Josey, OK I found a "deal" for the bridge rectifier.  gunrunnerjohn's comment made me take a look at some other PS1 board I have and one of them uses the DB104 which is equivalent to the DF04. Search eBay for auction 180874558192 and qty 4 of the DB104 is $1.29 with free shipping from Asia.  That's a good deal if you can afford the wait...

Originally Posted by GGG:

Josey,  That is the Full Wave Bridge rectifier that converts the incoming AC to DC.  G

so if this  78L05 5V regulator is IC1. or the bridge rectifier are the ones that the fan runs on?,,and if one of those goes bad that fan wont run?  with one is the comend one thats goes out the most?and how can you tell if one is bad?

Originally Posted by GGG:

Josey,  That is the Full Wave Bridge rectifier that converts the incoming AC to DC.  G

GGG sre you talking about the one thats next to the big round diod and in front of the AC+ aCG -in put plug??Or are you talking about the one that sits up with a hole tords the top and has 3 prong that goes into the board?

Originally Posted by GGG:

If either D1 or IC1 go bad no smoke fan.  D1 powers the board with DC, so measure voltage at heater element or output of D1.  If you have about track voltage out, D1 is good.  D1 also feeds IC1 to make 5V.  Measure output of the 2 pin fan connector.  If 0 and D1 is good, replace IC1.  G

Thankyou GGG!!!!  It was the IC1!!!  Now the fan works!!  Took one from a junk smoke unit board!!

Originally Posted by gunrunnerjohn:

The 78L05 runs pretty warm in those units, the fan draws about 50ma, and the little TO-92 package has to dissipate quite a bit of heat.  I have some Lionel smoke units with the same regulator and they have a little tab clamp-on heatsink hanging off the regulator.

i'd notes it get very warm/hot in the back part of that board.. is that common.?

For those hunting parts:

Not the cheapest source but they have everything you will need:

Digi-Key.com

I get stuff from them all the time, watch the shipping fees.

Parts are cheap but get enough to make the shipping worth it.

You can get the common stuff like the 78L05 & DF04 at radio shack sometimes.

Those are very common parts. but you are paying hi retail at RS.

Originally Posted by gunrunnerjohn:

Actually, I think you are confused about Digikey's shipping policies.  I routinely make small orders from them, and the shipping is typically in the $2-2.50 range for first class mail.  I get them in two days from the order placement.

where do you put the heat sink at on those boards?

Originally Posted by stan2004:

Josey, I couldn't find a similar "deal" on eBay for the DF04 but auction # 120925432518 gets you a suitable part (has higher voltage rating which is fine) qty 5 for $2 with free shipping but from Asia so 2-3 week wait.  Or I recommend DigiKey.com in the US where the DF04 is 45 cents each.  Specify USPS First Class shipping which will be about $3 and DigiKey ships same day so you get it in a few days.  Given the shipping cost, you might want to pick up other parts such as the 78L05 fan regulator ICs at 30 cents each, diodes, LEDs, resistors, or whatever's on your shopping list...

got 4 df04 and 4 78l05 from digkey..They get a A+ for sevice and fastshipping....Now I got my other smoke unit running now too!

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