Posted By
crock
on 2021-03-23
20:15:18
 |  Re: Plus/4 issues trying to solve with Diag264
Much as I would like to claim supernatural powers, I'm afraid it's nothing more than experience coupled with a decent knowledge of the hardware.
Your problem is that the cassette is not getting power for the motor. The unregulated 9v power is switched on by a transistor controlled by bit 3 of the CPU. You need to trace that power from the from the power socket, through the switch, fuse, rectifier and transistor. I'd start with the fuse.
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