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  1. #31
    Maine-iac's Avatar
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    Beseler lamp delay

    Quote Originally Posted by Phoebe
    I have just set up a used Beseler 23CII which has the Dual Dichro S colorhead. The problem is that the light does not always pop on as soon as it is switched on sometimes causing a delay of over 1 second. I have tested this both with the enlarger plugged directly into a wall socket and run through two different timers. Again, when the timer is started it may activate the light immediately or be delayed.
    The previous owner claims he didn't have this problem and I tend to believe him. I had the enlarger in storage for 2 years before finally setting it up. Any suggestions as to where I can begin troubleshooting?

    Regards,
    Phoebe
    I bought (many years ago) a brand new Beseler Universal colorhead for my 4X5 enlarger. From the beginning, I had (and still have) intermittent occurrences of the delay you talk about. Actually, the solution is very simple. I discovered through trial and error that it happened more frequently if the interval between times that I turned the lamp on was longer. For example, if I focused my image with the lamp on, and then allowed more than one or two minutes to elapse before putting the paper in the easel and making the exposure, the delay was more likely to occur. However, if I went straight from focusing/composing to loading the paper and exposing, with no more than 30 sec. to a minute in between exposures, it almost never occurs. Try experimenting a bit to see if this helps your problem as well.

    The other thing I noticed over the years was that even in cases where I got the delay, I couldn't tell any visible difference in the print. So I also wonder whether the light stays on after the timer counts down for the same length of time as the starting delay.

  2. #32

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    Beseler Lamp Delay

    Hello, have been following this thread with great interest. I would like to have a copy of the schematics if someone could email them to me, that would be great. I have been noticing the exact symptoms described here with my head. This is the first time I have ever posted anything so I am not sure what the next step is(so fill me in). I would also like to comment on how nice it is to see this medium used to help someone without all the bickering that goes on in some of the other threads and sites. Thanx Mark

  3. #33

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    Phoebe has the schematics right now. I think she did mention copies will be available after her tech finishes using them.

    I was looking at the system and recomended shunting the new style LED optoisolator into the circuit but you wouldn't have any idea what I am talking about unless you can see where it belongs since the electronics are designed in such a way that each part of the voltage stabiliser is a seperate circuit, it's not a simple on/off switch to control the bulb, thus the need for an opto isolator otherwise you'll have problems with color temperatures.

    I'm sure the final solution will eventually be posted.

  4. #34

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    Hi,

    Just an update to the list re my problem with the Beseler dichro lamp delay. I finally have a working unit. Once I gave my electronics guy the schematics he had no problems installing the new vatrol (LED version). Many thanks to Paul Ron for the schematics and Stephen at Beseler for his recommendations. Again, if anyone requires a copy I will be happy to mail them one.

    Phoebe

  5. #35

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    Phoebe, can you have your electronics guy pencil in the new vactrol on the diagrams? I'd like to know how he hooked it in as well?

    Do you have a way to make copies of the prints? I may be able to get copies made... let me ask around.

    Thanks
    Paul, NYC

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