Chromatography Forum

Hello all-

I was replacing an injection port line and somehow this happened to the solenoid valve:



Because of that, there was no power to the instrument.


So I replaced it with another valve that should be functional:



Still no power. Suggestions? Does it sound like a possible problem with the main board?

Thanks in advance!

John

John, there's a fuse on a circuit board that most likely shorted out when the terminals of the solenoid broke off. I'm pretty sure that you need to take off the right hand cover (as you face the 5890) and check the fuses you find.

Ask me how I know this....

I think there may also be a high amperage fuse on the power supply board ( bottom right after back cover removed). Been a while but I think it's there.

John, there's a fuse on a circuit board that most likely shorted out when the termianls of the solenoid broke off. I'm pretty sure that you need to take off the right hand cover (as you face the 5890) and check the fuses you find.

Ask me how I know this....

Yes, that was it - both fuses had blown, replaced them and the instrument powered right up...

But now, the detector, which should operate at 325 degrees, won't get past 205 degrees. And to add to that, when I turned off the zones and everything was completely cool, the detector showed a temperature of 168.

What gives? Sensor issue now?

Thanks for the replies!

John

You may have upset the connections of the detector when dealing with the mother board. The connectors I'm talking about are at ther upper right hand side of the mother board.
There is one plug for each detector. The wires can slip in the plug as they only have little "ears" on the wire terminal ends that are intended to lock them in the plug. You can remove the plug and check this and re set the wires if needed.

You may have upset the connections of the detector when dealing with the mother board. The connectors I'm talking about are at ther upper right hand side of the mother board.
There is one plug for each detector. The wires can slip in the plug as they only have little "ears" on the wire terminal ends that are intended to lock them in the plug. You can remove the plug and check this and re set the wires if needed.

I've actually tried this already - it's so hard to tell when you plug it back it whether or not the wire ends are staying in place.

It was suggested that I re-insulate the area around the detector as well as place one of those insulated cups around the detector end in the oven - a lot of the original insulation is gone, and there has never been an insulated cup on this instrument.

John