Recent content by Bart53

All the "trim pots" on the lite scene cards were set at zero. I have been in touch with Shaun at Johnson Systems and he thinks that the power supply could be causing the ghosting problem that we're seeing. I'm going to have the power supply ordered and will replace it. Thanks for you r help...

Thanks for the reply Microstar. I did check the input DC control voltage to the firing card with the controller at zero. It was about 1/2 a volt. While not a lot, it certainly seems to be causing the issue that I am seeing. When I unplug the DC control voltage connector the lamps go dark...

Hello All, I've got a church with the above dimmer system. I've had to replace the firing cards in three of the circuits. I'm using the FC-445 firing cards from Johnson Systems. I've also replaced the SCR's. What I have is some lamps glowing dimly after the lights fade to off. I've checked...

Thanks for your help.

I replaced the rs-422 chip but that did not solve the problem of no dmx output. Any other ideas?

Must be a married man, huh? :-)

I'll let you know how it goes. Have to order the part first. None in my area at the local electronics store.

Thanks for taking an interest in helping me out. I'll see if I can get a hold of one and replace it, and then see what happens when I test it out. Certainly cheaper than buying a whole new control console...

I do not see an SN75176 chip on the CPU board. Would a UA9638CP Dual High Speed Differential Line Driver be a substitute? It appears to be on the output pins that the XLR plug connects to via wiring.

Thanks to all for the replies!

I have a client with one of these that will only transmit analog. This will control the house lights. The DMX portion of the console is not functioning. The stepdown xformer that supplies the CPU board is putting out just over 9 volts on each side. The rectifier is putting out 25vdc. No...

He did say that they were dimmable LED's.

Hello All, I got a call from a client installing LED lamps in the above dimmer system. They cannot control the lights now with the LED lamps installed. Is there a way to change the dimming curve in the program for the dimmers to allow proper dimming of the newly installed LED lamps?Thanks...

Thanks again for relating your experiences with these LED lamps. I can see that the learning curve on these are going to be high because of their differences from manufacturer to manufacturer. If I am able to reach a resolution I will definitely post it here so that it can passed along...

Thanks for the info John. I've reached out to the manufacturer to get their take on it. I'll probably get a reply something like "each LED lamp will react differently in the circuit, try one until it works" or some such remark. We'll see how they address this. If there was a way to...