HP Forum Archive 09

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Thanks -- HP-41 Card Reader Saved! Message #1 Posted by Gordon Dyer on 3 Dec 2002, 8:05 p.m. Thanks to Tony Duell, Steve and Luiz Claudio for their help in getting my card reader fixed - saved from oblivion... I had a lot of fiddly fun fixing it but couldn't have done it without their help and spare parts. It's all thanks to the contacts made in this forum. Gordon.

Re: Thanks -- HP-41 Card Reader Saved! Message #2 Posted by David Smith on 4 Dec 2002, 5:57 p.m., in response to message #1 by Gordon Dyer What was the final solution to the problem?

Re: Thanks -- HP-41 Card Reader Saved! Message #3 Posted by Tony Duell (UK) on 4 Dec 2002, 6:13 p.m., in response to message #2 by David Smith IIRC, one winding of the head was open-circuit.

Re: Thanks -- HP-41 Card Reader Saved! Message #4 Posted by Gordon Dyer on 4 Dec 2002, 7:22 p.m., in response to message #3 by Tony Duell (UK) Yes, it was an open circuit winding in the head. Hard to imagine why it should go o/c when the unit had never been opened. Is this a common problem? The unit I repaired was Ser. No. 2051S45265 The unit used for spares was Ser. no. 2058S45914 I noticed that the repaired unit had some mods with wire links to the circuit board and the spares unit had a new design of board with fewer components and no wire links, so the design was cleaned up between these dates. Also the potting compund used in the head was different in the newer spares unit, it is black.

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