HP Forum Archive 15

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** HELP ** Need HP-67 Card Reader Alignment Message #1 Posted by Mike DiGirolamo on 22 Oct 2005, 4:31 p.m. Hi Gang, I've replaced a few deterioriated "gummy wheels" in the drives of HP-67's, one HP-97 and one in an external drive of an HP-41CX. In all cases of HP-67 replacement's I get a "error" message when feeding a card through after making the wheel fix. Ultimately, upon taking those units apart again and giggling things a bit, the problem has gone away. The giggle fix has always been a mystery to me. Now I'm working on an especially nice one and nothing I do seems to correct the problem. I've checked continuity sequencing for the "leaf contacts," and I don't see any wires that have come loose. Still when I feed the "Diagnostic Card" through, the "error" message presents. 1. Is there something I'm overlooking here? 2. Is there an alignment procedure for the leaf contacts/head? 3. Is there a manual or CD of alignment procedures for the 67/97 series available? Any and all suggestions are welcomed.. Help please! Mike DiGirolamo

Re: ** HELP ** Need HP-67 Card Reader Alignment Message #2 Posted by Jon on 22 Oct 2005, 4:56 p.m., in response to message #1 by Mike DiGirolamo Hi Mike: First look at the magnetic head. You should read aprox 50 ohms in the orange-blue wires and also in the red-yellow. If that is not ok you need a replacement part. Good luck Jon

Re: ** HELP ** Need HP-67 Card Reader Alignment Message #3 Posted by Mike DiGirolamo on 22 Oct 2005, 6:02 p.m., in response to message #2 by Jon Jon, Thanks for your post. Is the stated resistance with the head in-line or removed? Mike PS Where does one find a replacement head, if needed :(

Re: ** HELP ** Need HP-67 Card Reader Alignment Message #4 Posted by Mike DiGirolamo on 22 Oct 2005, 6:32 p.m., in response to message #2 by Jon Jon, I measure 50 - 58 ohms when head is disconnected. Any other thoughts? Alignment? Mike

Re: ** HELP ** Need HP-67 Card Reader Alignment Message #5 Posted by Jon on 23 Oct 2005, 5:10 a.m., in response to message #4 by Mike DiGirolamo Next step is the tantalum capacitor. You should replace the one at the top of the card readerīs circuit. 6 to 10uF will work fine. Take care with the polarity. If you send a photograph I will indicate which one must be replaced. Good luck Jon

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