HP Forum Archive 05

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HP-65 card reader motor with squeaking noises Message #1 Posted by Rafa, Spain on 26 Jan 2001, 11:56 a.m. Hello, I have aquired a HP-65. I've check the card reader and it works, but when the motor rolls it makes horrible squeaking noises. I suspect they are due to some oxidation problems, but don't know exactly. Does anyone know what they are for and how to amend these awfull noises?

Re: HP-65 card reader motor with squeaking noises Message #2 Posted by Erik Wahlin on 26 Jan 2001, 2:00 p.m., in response to message #1 by Rafa, Spain I have seen (heard) this happen when the motor is slipping inside the small gear that is attached to it. There is a small plastic insert inside this gear that acts like a clutch. It slips if there is too much torque required to drive the card. I would take the card reader apart and clean the teeth on both gears and use a small drop of "super glue" cyanocrylate on the motor shaft if the gear is too loose on it. Otherwise, remake the plastic insert. There are some consequences to gluing the gear to the shaft however. The motor no longer has a clutch to protect it if the reader gets jammed up and you need to make sure the glue does drip down into the motor. The other possible reason for noise might be that the motor has become loose or is not tightened evenly (i.e is cocked) to the calculator. There are two small screws that retain it to the calculator. Make sure these are tight and one is not tighter than the other one, which will cock the motor. Hope this helps.

Re: HP-65 card reader motor with squeaking noises Message #3 Posted by Angus (UK) on 26 Jan 2001, 7:44 p.m., in response to message #2 by Erik Wahlin It may also be where the shaft that the worm gear is on goes into the plastic. (One end of it is fitted to the motor spindle and the other end goes into the plastic) I'm not sure if it is exactly the same as a HP97, but my HP97 was making an awful noise until I put a minute amount of oil here. Fortunately it happened at the same time as I was replacing the rubber drive wheel, so at least I did not have to strip the little beast down just for that (though it really was an annoying squeak!)

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