Texas TI-59: A tale in pictures
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03-27-2021, 11:52 AM
Post: #24
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RE: Texas TI-59: A tale in pictures
Thanks to everyone !
I had seen that video, the original post is a very good reference for restoring the TI-59 The author, Jose, did a also a wonderful one for the SR-52 and thanks to that guide we have restored few SR-52 We usually do HP-65s and HP67s In that case, we measure the resistance of the head coils and then we connect the card reader to the main logic board Also those heads have 5 cables, a ground (black) and a 4 colored cables, which are the ends of the coils and these are connected to the amplifier into what is called RA, RB, WA, WB which I guess stands for read channel A, read Channel B, write channel A, write channel B with few capacitors there as well, all in all very similar to the TI architecture To see what's wrong, when the calculator does not read or write , we look at waves between one of the 4 channels and ground, not between the channels themselves (I don't know if I made myself clear) based on those waves we can understand if the amplifier has a problem or what's is going on when a card is passing thru, whether si for reading or writing i was expecting the same here, that why I was surprised nevertheless we will do some tests and publish the results thanks again to everyone ! take care ! Edoardo & Alberto |
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