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Old 21 February 2021, 01:39   #1
utukku
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A4000D problem solving

Hi, anyone have an idea what would cause ( on an A4000D ) whenever you open either a command prompt, or cli, it automatically prints this character continuously: '''''''''''' ( hyphen).


Also, when I hold the 2 mouse buttons down to get to the diag screen, it shows up for like 5 secs, then goes blank?

I have tried it with 2 know working mice and keyboards, but same problem.
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Old 21 February 2021, 09:16   #2
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Have you tried it without the keyboard attached? Does this still happen?

What if you type a single ' (key below esc), does it fix it?
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Old 21 February 2021, 11:01   #3
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Thanks for that idea. Have tried it without a keyboard attached, and both problems go away completely. Re-attach another known working keyboard, and the problem is back :-(. Pressing any of the keys does not fix it. in fact its like the hyphen key is being continually pressed down.

Thanks
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Old 21 February 2021, 14:23   #4
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Chips along the kbdclk and kbddat signal paths are: 74HC4066 U205, 7407 U141, CIA U350 for your scoping pleasure.
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Old 21 February 2021, 15:31   #5
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Turns out that the resistors on R36,R361 & R151 are wrong. Now going back for repair. :-(
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Old 21 February 2021, 15:47   #6
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How did you find this out? Are they visibly burned or similar?
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Old 22 February 2021, 01:52   #7
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I spoke to Chucky, and after looking at those resistors, he said they were the wrong ones and he's sorting out the repair. Unfortunately, he had a bag or 2 of mis-labled resistors supplied to him when he was building the board.





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How did you find this out? Are they visibly burned or similar?
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Old 22 February 2021, 07:56   #8
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Quote:
Originally Posted by utukku View Post
I spoke to Chucky, and after looking at those resistors, he said they were the wrong ones and he's sorting out the repair. Unfortunately, he had a bag or 2 of mis-labled resistors supplied to him when he was building the board.
Ok, this kind of problem would have been impossible to predict from afar. :-)
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Old 22 February 2021, 23:44   #9
utukku
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Probably not, but Many thanks for taking the time and trouble for trying!



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Ok, this kind of problem would have been impossible to predict from afar. :-)
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