Quote:
Originally Posted by ortek_service
>>
>>
I did also come across the previous thread SiriusHardware mentioned, where there had also been many tests (Inc. ctrl lines?) on the IEEE interface, to establish the MC3446 buffers were faulty. So there may be something useful there, regarding testing that part of it without having to work it all out again: https://www.vintage-radio.net/forum/...163589&page=13 |
I had a look at this, and it seems there was just resistance measurements made on the IEEE Bus-side of the buffers
- but that had found UA9 (as well as UA7) was faulty.
However, whilst useful to see if internal termination resistors are faulty, that alone may not always find other faults.
So it would have found a fault with one of the UA7 / UA8 buffers, where the output was going higher than expected due to this. But it wouldn't have found faults with a receiver buffer in each of these.
Although could be done on the remaining (untested so far?) UA9 buffer, as a quick-check test for starters.