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HP-67 1805S02334 [RA and RB noisy, doesn't read but writes]
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HP-67 1805S02334 [RA and RB noisy, doesn't read but writes]
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HP-67 1805S02334 [RA and RB noisy, doesn't read but writes]
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11-20-2021, 08:27 PM
(This post was last modified: 11-20-2021 09:14 PM by albertofenini.)
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HP-67 1805S02334 [RA and RB noisy, doesn't read but writes]
Hi Everyone,
this is about asp HP-67 with what looks like a noisy card reader While CA and CB looks fine, both when reading and both when the calculator displays a 0.00 RA and RB show a noise immediately after power on When reading a card you can still see the the reading among the noise We have already replaced the sense amplifier with no improvements We have already swapped the CPU board with a known working one with no improvements What could it possibly be ? Any suggestion will be greatly appreciated ! Take care ! [EDIT] I have also uploaded some WA and WB captures As a matter of fact the captures show no noise and a good wave on WA and WB both when reading and when writing (switch W/PRGM in Write position) The so written card can be successfully read on a different working HP-67 Pictures here : HP-67 1805S02334 Edoardo & Alberto |
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HP-67 1805S02334 [RA and RB noisy, doesn't read but writes] - albertofenini - 11-20-2021 08:27 PM
RE: HP-67 1805S02334 [RA and RB noisy, doesn't read but writes] - teenix - 11-20-2021, 11:50 PM
RE: HP-67 1805S02334 [RA and RB noisy, doesn't read but writes] - albertofenini - 11-21-2021, 01:44 PM
RE: HP-67 1805S02334 [RA and RB noisy, doesn't read but writes] - albertofenini - 11-21-2021, 02:19 PM
RE: HP-67 1805S02334 [RA and RB noisy, doesn't read but writes] - teenix - 11-21-2021, 07:51 PM
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