HP Forum Archive 14

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11c Power Supply Capacitor Message #1 Posted by Lunn Sawyer on 19 Dec 2003, 10:18 a.m. I suspect that my power supply cap is bad on my HP-11c. I would like to replace it but am not sure of its value. It has 2 numbers legible on it "22" and "10". Is it correct to assume that this means "22pF 10%". Does anybody know? Thanks Lunn

Re: 11c Power Supply Capacitor Message #2 Posted by David Smith on 19 Dec 2003, 11:33 a.m., in response to message #1 by Lunn Sawyer It would be 22 microfarad (uF) at 10 volts.

Re: 11c Power Supply Capacitor Message #3 Posted by Nelson M. Sicuro (Brazil) on 19 Dec 2003, 11:34 a.m., in response to message #1 by Lunn Sawyer It is 22uF (micro-farad) x 10V (volts), the tolerance doesn't matter much, as is a "backup" capacitor (to preserve memory when changing batteries) The capacitor voltage must be higher than 5V. You can find some 22uF x 6.3V or even 47uF x 6.3V (more time to change batteries) to replace it. If you can get the tantalum ones, they are smaller and more durable. Good luck! Nelson

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