Where can I find K-Line 3790-4015S Big Boy Parts (Smoke Unit Parts, Screws)

Just did some more looking. Would it possibly be K3790-X033 or K3790-X033A for the smoke resistor?

@dkdkrd posted:

I thought I read somewhere that Brasseur's (Saginaw, MI) bought out the remnants of K-Line parts inventory?

KD

That was the site I linked actually

Its most likely a common 27 ohm wire wound resistor. Lionel has them. As for the cap you won't find it from Lionel or K-Line. There are hundreds that would work. Some electrolytic with at least a 15volt rating and small enough to fit. Capacitive value not all that critical. K-Line only offered a handful of engines with fan smoke. Someone would have to check theirs to determine an exact match.

Pete

Pete, revise that voltage specification upward!  The peak voltage on that cap, even with half-wave power, will exceed 15 volts.  The caps in the Lionel smoke units are rated at 35V, that's a safer number.  A 100uf 35V cap is pennies, and will be suitable for that smoke unit.

I assume the smoke unit is driven off the R2LC, not track power. I didn't see a regulator on the board but if there is one the cap would only need to be around 6.3v. 

Pete

@gunrunnerjohn posted:

Pete, revise that voltage specification upward!  The peak voltage on that cap, even with half-wave power, will exceed 15 volts.  The caps in the Lionel smoke units are rated at 35V, that's a safer number.  A 100uf 35V cap is pennies, and will be suitable for that smoke unit.

So would this work for the cap?

https://www.radioshack.com/pro...ectrolytic-capacitor

I doubt it would fit easily.

Pete

I should also mention I’m missing the screws for the smoke until in addition to the body screws that I already mentioned. Anyone know where I can find those or ones that will fit?

And as far as a capacitor goes, I don’t know a whole lot about them. Should I measure the hole spacing to find the correct size one?

@Norton posted:

I assume the smoke unit is driven off the R2LC, not track power. I didn't see a regulator on the board but if there is one the cap would only need to be around 6.3v.

Pete, the R2LC smoke output puts out half-wave track power in command mode and full-wave track power in conventional mode. Since there is a diode, it would all end up being half-wave. Half-wave 18VAC peaks at 12.7 volts, so the cap will charge up to the peaks. As I said, the Lionel smoke unit with the same arrangement has a 35V cap.  The cap comes BEFORE the regulator, so it sees the full voltage.  There is a regulator, it's missing as well. 

I've never seen any of these smoke units run the fan on unregulated power, that arrangement would put 11-12 VDC on the motor, that would make quick work of that motor!  I think we need to see better pictures.  If they are feeding this with some other source of power, I can't imagine what the diode and cap are doing there.  Here's a view of the bottom of a K-Line smoke unit, note the regulator.

@jaketrainz posted:

And as far as a capacitor goes, I don’t know a whole lot about them. Should I measure the hole spacing to find the correct size one?

Measure the space between the leads and then the diameter available between the connectors to install the cap.  Find a 35V 100uf cap that fits, there should be tons of them.

Here's a suitable cap, pretty sure the lead spacing is .1".  Kemet ESH107M035AE3AA.  Pretty sure you'll also need the regulator if it's not there.  TI LM78L05ACZ/NOPB.

John, since you have a K-Line fan smoke unit why didn't you post the picture in the first place instead of letting folks make guesses on what the poster has?

Save me from your condescending assumptions. A 3.3 volt motor will burn up with 12 volts applied, really? Save that crap for your fan club.

Pete

Pete, I found the picture on the web, I don't have one in hand or I'd have posted the picture sooner.

I'd burn up a motor for you, but I don't have any of them I want to sacrifice.  Have you ever heard one of the smoke fan motors running on higher voltage?  It's pretty loud, and I'm sure it won't last very long that way.

Not entirely sure why you're getting so worked up.

I will post a better picture of the board shortly. I will also include a top shot. Didn’t know a regulator was missing so I’m glad that was caught

Here are some (hopefully) better pictures

I’m also not seeing where a regulator would go although looking back at my original post, the wires were covering another element on the board so that may be it

You're not seeing where a regulator "might" go because there's already one on the board!  We couldn't see it with the other photo, look again at the board.  The black component with three leads is the regulator!

@gunrunnerjohn posted:

You're not seeing where a regulator "might" go because there's already one on the board!  We couldn't see it with the other photo, look again at the board.  The black component with three leads is the regulator!

I thought that might be it! Alright, so it looks like I need a resistor and a capacitor. Anyone know what size screws are used for the smoke unit?

@gunrunnerjohn posted:

They're metric screws, 3mm and 6mm long if they right into the PCB, 8 or 9 mm long if they are holding a smoke funnel.

What’s the best place to source the screws? I have an assortment of random train screws, none of which fit. A google search for 3,6,8,or 9mm screws gives me wood screws and others that are far too big. Is there something more specific I should search? Also, what size screws for the body? Then I’ll have everything I need.