Author
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Topic: Xetrol Dimmer Delayed "UP"
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Steve Kraus
Film God
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Posts: 4094
From: Chicago, IL, USA
Registered: May 2000
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posted 03-07-2017 08:16 AM
I have a couple of venerable Xetron Xetrol dimmers. They are in the adjacent electric closet and remoted to the booth. The remote buttons are similar to those on the units with indicator lamps.
One of them takes its own sweet time responding to the UP button. Wait a while and then it comes up. I'm trying to find the cause.
The issue is variable. Sometimes the ramp up begins right away; sometimes the long delay. Pressing the dim button and back to bright, more than once, while this is going on doesn't seem to do much.
It's not a button issue nor, I think, a relay issue as the indicator lamps respond immediately. Just in case I replaced the UP relay on that unit. I have also swapped control circuit boards. That doesn't leave too much: Principally the triac "Power Cube," the power supply, and the big inductor.
The dimming ramp down works normally. This unit has the external "Emergency Full Up" apparatus attached, if that makes any difference. That works normally. (Who'da thunk external gear was needed for that rather basic feature?)
Thinking maybe it's a dirty contact on the ramping speed pot I worked that back and forth a bunch of times but so far as I can tell that control is working normally: After the delay the dimmer ramps up in accordance with that pot's setting, faster or slower.
There are a few little odds and ends on the motherboard: A couple of resistors and a couple of small caps. I wonder if this might be where the issue is.
Years ago I had to replace a Power Cube but I was totally dumbfounded when, on a different occasion, the unit failed and no amount of swapping of parts would get it going until I investigated those mother board resistors and found one open.
Maybe someone has been down this road before as these were once common.
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