Quote:
Originally Posted by ScottishColin
UA7 and UA8 replaced and the test program now runs through without error - thanks all.
Cassette port 2 next.
Colin.
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Good to hear that replacing these has now sorted that.
Luckily there's really only 3 transistors & a zener-diode (all quite low-cost), in each of the cassette ports interface.
- So assuming the check SiriusHardware mentioned earlier shows that Port 2 is being controlled-correctly by the UC5 (6522), then it should be just a case of following through this switched transistor regulator circuit by measuring a few voltages with it enabled and disabled.