Hp-41C card reader - dead
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07-07-2022, 01:47 PM
(This post was last modified: 07-07-2022 01:49 PM by AndiGer.)
Post: #122
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RE: Hp-41C card reader - dead
Hi Marco,
I can feel with you because I now also have a card reader that always reports malfunction :-(. The card is running very quiet and smooth thru the reader (tried many). And also another calculator. After I got the cover off and could take out the board I soldered some wires to GND RA and RB to measure with the oscilloscope. Signals IMHO look very good. @all: Anybody another idea what to check? Measure lines to the calculator? If yes - what exactly can I measure there? Thank you Andi |
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