Well, I certainly am feeling guilty for not looking up the datasheet. In his first post he called them transistors and I made an ass-umption without bothering to look them up.

I am not good at looking at photographs and reverse engineering, only the "obvious" things. I see that line voltage is being rectified here for the control circuit, but I would be curious to know if the voltage the devices are switching is AC or DC.

If the SCRs are rectifying when they switch it might be a problem.

And if he jumpers them, well who knows if the circuit will operate properly or draw an acceptable current. I wouldn't want to guess.

Was just trying to help and made wrong assumptions. I hope he reads this before potentially destroying his lights.

 

karlb123,

Sorry I didn't post this earlier on TUES - I meant to, but forgot as I burned the midnight oil out late night.

What kind of control chip (IC) is mounted on that 2008L (803) mini PC thru board that drives the gates of those 4 switched (UTC?) PCR406J SCR's?

You really need to post another pix of the component side of the PCB only from the opposite direction.

I would have thought that the mfr would have given you that Strobed option on the PCB, but I see it's only an ON/OFF only scheme with the switch on the GRD side. Kinda weird, but I guess it saves on the micro-switch contacts arcing! I guess if you wanting just straight ON/OFF LED lights then you would just buy them that way.

Shorting out an SCR, or any similar device is NOT highly recommended at all. It only results in SMOKE & FIRE!!

Those PCR406J SCR's btw follow from left to right K-A K-A K-A K-A. Not sure what the J designation is for, but my guess is that it has something to with European standards possibly??

Hope to see another pix from the other side of that 2008L (803) mini PC thru board.

Frank