[pure-silver] Re: wiring diagram for Devere 108S?
- From: Martin Jangowski <martin@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 16 Nov 2007 15:11:26 +0100 (CET)
On Fri, 16 Nov 2007, Shannon Stoney wrote:
I talked to the people at Odyssey sales and the guy there had actually built
these enlargers at one time. He said that he could send me a wiring diagram!
He also told me that the missing fuse had nothing to do with the light not
working; it goes with the motor that moves the baseboard up and down, and
that has never worked.
If your lamps work with household voltage (230V in Europe, 110V (?) in
the states) chances are that there is something wrong with the wiring.
More "modern" enlargers often use things like stabilized power supplies
and low(er) voltage halogen bulbs. My Durst G139 with its CLS1000 head has
one of these stabilized supplies. I recently opened it to view the innards
and just hope that there will never be a failure with it... it gets 230V
from the enlarger timer and the net, feeds the 120V/1000W halogen bulb
with stabilized voltage, keeps the bulb on a low voltage (about 15V) when
not currently exposing (to minimize thermic stress to the filament by
keeping it glowing dark red), creates voltage-ramps for soft starting and
stopping the bulb (it takes about 1s after engaging the timer until the
bulb voltage is up, the light output ist stabilized and the filament has a
constant temperature), it opens and closes the shutter, keeps the bulb a
few seconds fully on after exposure, but closes the shutter, lowers the
voltage to the standby voltage after some more seconds and drives the bulb
cooler according to usage.
To repair this thing without a service manual takes more than I'd be
capable of. The complete thing is full of old school things like OpAmps,
transistors, rectifiers, caps and coils. It is surprisingly light (no big
1kW transformator) and no unobtainable programmed logic, but it would take
a lot of reverse engineering to rob its secrets. This is why I don't like
the latest microprocessor controlled closed loop enlagers. These are by
now dirt cheap, but no one will be able to repair them in a few years. I
can hope to build a power supply that will deliver 24V for the fan and the
shutter and 120V/8A for the bulb, but to recreate the whole soft-start
shebang would be a lot of work.
Grüße aus Hohenlohe,
Martin Jangowski
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