|Re: Desktop calcs - residual noise levels?|
Message #9 Posted by Tony Duell on 23 Oct 2008, 6:53 a.m.,
in response to message #1 by Mark Edmonds
The 9805 may well not have a fan, since it's built like a 46/81. But I think all other 98xx machines have cooling fans. Certainly the following do (I have all of them) : 9810, 9820, 9830, 9815, 9825, 9831, 9845B, 9826, 9836, 9816, 9817
The 9100 doesn't have a fan. Apart from the magnetic card reader,
The fan shouldn't be _that_ noisy. I have found it helps -- a lot -- to take the fan out of the machine (I can talk you through this for most models), take it apart (again, I can help you), clean and relubricate the bearings. I do this as a matter of course.
Yes, you can still hear the fan, but I don't find it annoying. I would also not disconnect the fan, I suspect it's there mostly to cool the logic (rather than, say, a card reader), and I'd rather put up with the noise than have to replace chips.
Somebody else mentioned a noisy HP9815 printer. There's a little bit of foam in this unit (same mechanism as a 9825) which tends to decay with age. It's not hard to replace it.
The printer unit in the 46/81 is actually an Epson mechanism I believe. I have a 'lubrication chart' for that, actually in the manual for a Fluke data logger. It's basically a drop of machine oil on all the sintered bush bearings. I do that to every 46/81 that crosses my bench.