HP-67 Card Reader became very touchy
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09-30-2023, 08:58 AM
(This post was last modified: 09-30-2023 09:01 AM by Alevin.)
Post: #20
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RE: HP-67 Card Reader became very touchy
(09-30-2023 01:22 AM)teenix Wrote: The 97 has a 5V battery so the capacitor for it would be best rated for 16 or 25 volts. I am afraid my soldering skills and avalaible tools are not enought to do the job without messhing something else, as a "forest" of tall components grow around the cap. For me, desoldering and soldering throuhg the PCB holes seems easier. Any way, It is a great suggestion to think about. Some point out. The 47 uF 6 volts, dip format, has a ESR about 2 Ohms in catalogs. So, not so different for the ESR I measured on board (with a Chinese "ESR meter" ), 2,7 Ohms, for the suppoused failed Cap. Then may be is it not so faulty if the present cap is not 16 or 15 volts but 6 volts? I guess, I will not know up to change it. Regards Ricardo |
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