I have 2 HP41's (Fullnut CV's), one with some dust,and what looks like paper or cotton fibres, behind the screen cover/lens, and the other has a sticky "PRGM" key.
I would love to send these to say Randy at FixThatCalc, but as I live in South Africa, the shipping costs would be prohibitive. So I need some advice.
I can get access to an ultrasonic cleaning bath, but have a few questions:
1. Can I just use water in the bath, or should some other cleaning solution be used?
2. How long should the calculator remain in the bath for?
3. What frequency should be used?
4. Should the LCD be kept out of the bath (I assume it should)?
Second issue (screen dirt):
1. Is it very difficult or dangerous (in a destructive meaning) to remove the LCD screen and clean out the dirt and dust behind?
2. Any precautions or advice in carrying out this task?
I would appreciate any advice from forum members.
Thanks
John