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Workflows => Screen => Topic started by: Ear on July 20, 2015, 01:02:21 PM

Title: Humidity Problem
Post by: Ear on July 20, 2015, 01:02:21 PM
Came in this morning to a "dew condensation" error on my Screen pt-r 8600 platesetter. She won't initialize and says I need to lower the humidity. This is SO Oregon in summer and it's dry as a bone... less than 40% humidity.

I typically leave it on 24/7 but we have been having random power outages so I turned it off for the weekend. I'm guessing the fact that its fans weren't running allowed some condensation in a diode block. I tried running on half-diode mode but it must check all of them on initialize. It says it is in diode block 6.
Title: Re: Humidity Problem
Post by: Farabomb on July 20, 2015, 01:17:38 PM
Any chance you get those big ass desiccant packs with your paper like we do? Maybe toss one of those in there and it will absorb any extra moisture.
Title: Re: Humidity Problem
Post by: Ear on July 20, 2015, 01:24:07 PM
I haven't seen those. They don't need to use moisture control in the west because it is so dry. I'm very surprised that I have this error, because it is not remotely humid here. It must be very sensitive and just have a little condensation on a lens or something. I do not want to try to climb inside and open the printhead.
Title: Re: Humidity Problem
Post by: Joe on July 20, 2015, 01:25:26 PM
Faulty sensor?
Title: Re: Humidity Problem
Post by: Ear on July 20, 2015, 01:34:13 PM
hmmmm... maybe
Title: Re: Humidity Problem
Post by: Farabomb on July 20, 2015, 01:51:02 PM
Blowtorch?

Taco bell?

Profit?
Title: Re: Humidity Problem
Post by: Ear on July 20, 2015, 02:06:00 PM
I tried a blow dryer.

Called my tech and he is checking to see if it might be a sensor.
Title: Re: Humidity Problem
Post by: Ear on July 20, 2015, 03:11:40 PM
She's back up and running. I took all the covers off (terminated the interlocks while I was at it - run without covers), put a big fan with a hair dryer behind it, aimed at the printhead. Half hour of that action and it dried out and started up. WOOT
Title: Re: Humidity Problem
Post by: andyfest on July 21, 2015, 03:13:47 PM
Quote from: Ear link=msg=270496 date=1437411741

Came in this morning to a "dew condensation" error on my Screen pt-r 8600 platesetter. She won't initialize and says I need to lower the humidity. This is SO Oregon in summer and it's dry as a bone... less than 40% humidity.

I typically leave it on 24/7 but we have been having random power outages so I turned it off for the weekend. I'm guessing the fact that its fans weren't running allowed some condensation in a diode block. I tried running on half-diode mode but it must check all of them on initialize. It says it is in diode block 6.

Check the readings on all 8 of the dew sensors. If there is one (#6 in your case?) that reads way higher than the rest its likely the sensor that is at fault. A reading of 2 to 13 is normal - 20 and over will give you the warning. We have had 3 of them replaced on our T9000 (Screen 8600) in the last couple of years. It is a real PITA as all of the laser diodes have to be removed to get at the dew sensors. The sequence to check is Offline>Next>Service>OK>8600>Enter>OK>Recording Head Test>OK>Next>Next>Temperature>OK>Next. That should get you to the Test Points (TP - normal is 24-25) and Dew Point Sensors (DE1 to DE8). When done ESC to online menu.
Title: Re: Humidity Problem
Post by: Ear on July 21, 2015, 03:24:55 PM
Thanks for the tip, Andy. I will definitely run that test.
Title: Re: Humidity Problem
Post by: jimking on July 22, 2015, 08:50:32 AM
There's always de-humidifiers one can purchase. However, if the platesetter is in a very large space..............
Title: Re: Humidity Problem
Post by: Ear on July 22, 2015, 12:12:51 PM
True. We really don't have high humidity here... I think it was just that I had it shut down for a couple days... no air flow and the AC was running in the office. A little condensation and it got all belligerent.
Title: Re: Humidity Problem
Post by: born2print on July 22, 2015, 03:50:43 PM
That's my Ear! Can even make a platesetter moist  :shocked:
Title: Re: Humidity Problem
Post by: Ear on July 23, 2015, 12:32:24 PM
Quote from: born2print date=1437594643 link=msg=270572

That's my Ear! Can even make a platesetter moist  :shocked:

... be all like "hey baby, are your diodes thermal? cuz you're makin' me hot. :naughty:"
Title: Re: Humidity Problem
Post by: born2print on July 23, 2015, 12:45:30 PM
Wanna raster my pixels? :naughty:
Title: Re: Humidity Problem
Post by: Ear on July 23, 2015, 01:04:20 PM
I use Raster Blaster... better wear goggles. :naughty: