Microtek 120TF Scanner - no support
Recently, viewerofrecphoto posted:
On Sep 18, 10:25 am, viewerofrecphoto wrote:
On Sep 18, 10:01 am, "Neil Gould" wrote:
Recently, viewerofrecphoto posted:
On Sep 18, 8:09 am, "Neil Gould" wrote:
Sorry to hear that the easy solution wasn't the fix.
If I follow what you've described, that it works soon after you
turn the unit on, but soon stops working, it sounds as if there
is a bad capacitor in the lamp's trigger voltage circuit.
There are 2 caps on the driver board - one connects to the lamp
output and the transformer. Its labeled "1S 3KV SEC:". The "S"
might be an "8"
This is a likely culprit. The key is the "...3KV...", or 3,000 volt
rating. All of the lamps had a trigger voltage higher than a couple
hundred volts, and it is typical that a capacitor such as this one
would feed a coil that connects to the lamp (you may be mistaking
the coil for a tranformer?). I'd replace this cap and see what
happens.
The other cap is near the input, between ground and +12V and is
labeled
".47uf 50V"
I doubt that this cap would affect the problem at hand, but while
you're in there, replace it, too.
Neil
i just ordered from Mouser. will report back...
The new capacitor is in. So far, I've scanned a couple of slides and a
couple of
negatives and it seems to be working. This is using the new bulb and
the scans
look fine, with no recalibration other than what Lasersoft does
automatically.
I also replaced the noisy fan, so I'm very happy.
Thanks for your help!
I'm glad you got it up and running again! Who knows... I might need to do
the same to my 120TF some day.
Neil
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