Darkith intermittent problem?

[wibblywobbly]

I have just built and installed a Darkith unit into an RX18 equipped T34. I have one in a RX14 Bulldog and it has always been flawless

For some odd reason there is an intermittent problem with the start-up.

Sometimes I can switch it on and it boots up perfectly, other times it won't?? When it is running everything works perfectly, as it should.

I have double checked all of the solder joints, run over it with a multimeter checking continuity, and ensured that the battery is fully charged.

I don't even touch the tank. Sometimes the start button starts the tank, other times nothing??

The power is ok to the RX18, I have a power on LED hooked up to show that it is live. The problem is with the signal getting from the HL receiver board, through the Darkith board, and to the RX18 when I press the start button.

Although I can check continuity on the + and gnd, I can't check the sig circuit as that goes through the IC chip, as I have no idea where the signals exit the chip.

I suspect the IC chip may have a cold joint in it somewhere, but has anyone else had this problem??

Cheers

Rob G

[971wright]

Hi I had a board that did this then stopped never did find out the problem ,can only think that while looking for the cure a moved something and it cured it ,if the board works its not that. I kept looking aournd the reciever and ariel and crystal,could be the crystal legs need bending out a touch.Have tried another transmitter.

regards pete

[wibblywobbly]

Hi Pete

Dave did mention that he had one customer that found that his tx would not work with the DBC/DBU, but when he tried another one it was fine?

I might try another rx board and see if that solves it, or another crystal. Though if I bypass the DBC it will run perfectly every time using just the RX18 and receiver board that I have in there. I have tried nudging board compenents to see if there is a dry joint somewhere but it starts totally randomly, literally without me doing anything other than turning the tank on. It has to be the signal circuit somewhere, if all else fails I will try and source another IC chip...talk about frustrating!

Cheers

Rob G

[971wright]

Hi Check the 5v power conection as well .

regards pete