Post by wdln on Sept 7, 2019 21:58:32 GMT
Posting this as a solution for someone to find. For once I’m not begging for an answer myself!
I have a TI-1 I acquired a few months ago. After cleaning it and fixing some basic issues, the problem it was having is that only a few letters would play a selection. All the numbers, but only N, Q, S, and U selections would play. Others appeared to register the selection and start the scan, but in actuality did not push the pin out so the magazine scan would find and play the selection. So it would do a full cycle of the scan and give up, as there were no pins to trip it.
After a lot of dorking around with the contacts on the selection mechanism and a lot of staring at the schematics, I sort of accidentally discovered that briefly (and somewhat energetically) exercising all the selection buttons while in service mode would bring back all the missing selections. A few more tests verified that when it had that problem, that was always the fix. All the buttons are wired in series when un-pressed... apparently there’s a bad contact in there somewhere that breaks the loop and causes a bunch of the letters to not work when they ARE pressed. So I still have to find the culprit, but in the meantime, another TI-1 has a brighter future.
So if you’re having this problem, try the button trick.
I have a TI-1 I acquired a few months ago. After cleaning it and fixing some basic issues, the problem it was having is that only a few letters would play a selection. All the numbers, but only N, Q, S, and U selections would play. Others appeared to register the selection and start the scan, but in actuality did not push the pin out so the magazine scan would find and play the selection. So it would do a full cycle of the scan and give up, as there were no pins to trip it.
After a lot of dorking around with the contacts on the selection mechanism and a lot of staring at the schematics, I sort of accidentally discovered that briefly (and somewhat energetically) exercising all the selection buttons while in service mode would bring back all the missing selections. A few more tests verified that when it had that problem, that was always the fix. All the buttons are wired in series when un-pressed... apparently there’s a bad contact in there somewhere that breaks the loop and causes a bunch of the letters to not work when they ARE pressed. So I still have to find the culprit, but in the meantime, another TI-1 has a brighter future.
So if you’re having this problem, try the button trick.
