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Old 26th November 2009, 02:00 PM
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PaulG PaulG is offline
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Default Enlarger timer issues

Here’s a request for a sanity check

I use an Omega Superchromega DII dichroic enlarger, with the wonderfully-named Chromegatrol combined power supply and timer. The timer part has become increasingly erratic. Not only is it inaccurate, it’s unpredictably innacurate, so I can’t simply work out a correction factor for exposure times. The logical solution seems to be to add a spare Paterson digital timer that I have into the circuit to give me some semblance of accurate exposure time. I plan to do this by putting the timer between the mains socket and the power supply, leaving the power supply on ‘focus’ mode so that when the Paterson timer decides to let power through, the enlarger lamp will come straight on..

This seems a sensible approach, but I’m a little worried about only having the cooling fan in the enlarger head running when the timer is on. The fan normally runs continuously when the psu is switched on and independently of whether the lamp is on or not. Is there an exposure time beyond which I shouldn’t go to avoid overheating problems?

Any thoughts/words of widom gratefully received.
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