Quote:
Originally Posted by coldlegs
Allan
been watching this thread with interest as a QHY9 dark line sufferer like yourself. Have you succeeded in creating an artificial star yet to test the adjustment? If you do then an adjustable pot on the outside will certainly be on the cards for me. Not sure how I will seal it though with thermal expansion and contraction sucking moisture in. Might araldite the back end of the pot into a solid lump although araldite does get old and brittle. Silastic maybe??
Cheers
Stephen
|
Hi Stephen,
I haven't made an artificial star yet.
I want to use a real star for my testing first.
Well - you might be lucky & not have to seal anything.
I can see the same problem with your pictures.
QHY are obviously mixed up about the settings for the R27 pot
that controls black horizontal lines.
Is it 2.4 Volts or 2.2 Volts?
The picture & the text disagree.
If that's the case then maybe 100s of these cameras are mal-adjusted from the factory?
Don't quote me on that yet.
Mine was faulty from brand new & I thought it was normal.
I need to check the camera now that it's set to 2.2 Volts & see what happens.
Also - you won't believe this -
around all 3 connectors & mostly on the gold plated threaded connector
there is a huge air space -
the camera is not sealed!
If I have to wire an external pot in place - I can easily run wire-wrap
wires out through the space between that connector & the housing.
Therefore don't worry about Araldite to make a good seal - there is no seal.
The problem will be getting the pot R27 off the PCB.
It would need 2 soldering irons -
one for the 2 pins at one end & the other for the one pin at the other end.
If not - the surface mount pot R27 would possibly rip the tracks off the PCB -
if just soldered one side & you tried to lift the part off.
I was going to do that today but I didn't have 2 soldering irons.
I do have that at work - as I'm an electronics technician so
I may rework this job with an external pot if I have to.
cheers
Allan