RC Tank Warfare community hobby forum

thanx for those specs strmnd54. I'm going to try you mods and see how it goes as I have my Tiger I torn down for a refit

strmnd54 wrote:

[Everything else works fine so I dont know if its worth paying to replace the board to get the smoke working.

Don't replace your board ; chances are that you blew the power transistor driving the smoke unit ....Just bypass the transistor and send the power directly to the smoker ...The only difference is that the smoker will turn on as soon as you turn on the power switch ...It's not synchronised with the sound anyway ...
If you are handy with a soldering iron ; here's a few pics ...

Anyone happens to have a circuit diagram for the RX18 board? The power transistor is a H772 http://www.hiwtc.com/products/transisto ... 9-2584.htm" onclick="window.open(this.href);return false; (0.3$ unit, but you need some soldering skills to replace it) , but I'm not sure about the blown resistor R22.

Lol ta for info, though I said in an earlier post its all sorted. I had to bypass the transistor as it just wont budge, but smoker is still all working fine after a couple months I have been meaning to finalise the smoker as I need to get a better flow through it and a practical way of re-filling the fluid. I plan to do this and a million other things over Christmas hols
Dave

If you carefully trim off the three wires of the transistor up to the PCB surface you'll be able to remove it.

Just for info. I use fog fluid in my smoker. The same stuff as DJ's use in their smoke machines. I got 5 litres for £15 off Ebay.

Phil

That's good to know, the price isn't bad at all and 5 litres should last forever .

Btw, the Rx13 I used to update the Panther to S&S is feeding negative voltage to the smoke unit. So far it's working without any problem, but is this normal?
(the smoke unit is non-proportional, older type with the oil chamber glued and the power transistor on it's small PCB)

Gerula , I'm having problems to reply to your posting on the RCU forum ...They seem to have troubles with their site ....
Anyway , I wasn't familiar with that second generation of H.L. smoker units ...
If that transistor is powering the pump motor and the heater element ; you don't have to worry about blowing your main board ....
So enjoy your smoke .....

Thanks a lot . Now I only have to be carful not to torch the tank if the unit runs out of oil .

Since we're at it, can you tell me what are the specs for the R22 resistor on the Rx18 board? (someone said 2.2 ohm, but in the pic you posted here it looks to me like a red-violet-gold = 2.7 ohm).

I also have a toasted the H772 transistor and the damn thing isn't available here, so I'm thinking of replacing it with
a BD238 http://www.datasheetcatalog.com/datashe ... D238.shtml" onclick="window.open(this.href);return false;
or a BD440 http://www.datasheetcatalog.com/datashe ... D440.shtml" onclick="window.open(this.href);return false;

Which one do you think it would be a better match for the original H772?

R 22 is 2 Ohms ( red- red- gold ) and looks like 1/2 Watts and has nothing to do with the smoke unit ; It's part of the turret system ....

The BD440 is a closer match to the H772 than the BD238 ...
If you are really stuck ; I have some spare H772 that I could mail you ....

Thanks a lot. Don't want to abuse of your kindness unless I have no other option. Do you think the BD440 would do the job?

Also are you sure about the R22 being 2 ohm? In the pic you posted here it sure looks identical to the R18 on my board, and that's definitelly a 2.7 ohm. Can you measure it to make sure?