Introductions

[beeingdavid]

Hi David, welcome to the forum and back into the Microbee world

Remove and re-insert the top coreboard a number of times generally helps.  Same for any removable chips.  I wouldnt raise the voltage above 12v in fact I'd lower it to 10v as the Tant caps near the voltage regulators tend to fail.  Have you checked the output voltages of the voltage regulators?

Looking forward to your Premium Plus kit construction story.  I have one and is simply the BEST Microbee ever made.

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Hi David, welcome to the forum and back into the Microbee world

Remove and re-insert the top coreboard a number of times generally helps.  Same for any removable chips.  I wouldnt raise the voltage above 12v in fact I'd lower it to 10v as the Tant caps near the voltage regulators tend to fail.  Have you checked the output voltages of the voltage regulators?

Looking forward to your Premium Plus kit construction story.  I have one and is simply the BEST Microbee ever made.

Hi Chickenman, thank you for your encouragement. I have reseated the core board a few times, but unfortunately it is still being passive aggressive. No beeps for me. I have checked that there is voltage to the board, and I am getting around five volts at one of the voltage regulators. I haven't yet reseated any of the ICs. Next I will probably replace the filter capacitor. When I was using the variable power supply, the Bee wasn't beeping till it had at least 11 volts. If something should have happened it ten suggests that there was a bit of a drain that shouldn't have been there. so I had thought 12 volts would give it a bit of a margin. The plug pack is marked 12 so I thought it was safe, but now I note that the actual voltage from the original plug pack is closer to 11. I suppose I should move this discussion to another thread "people who gaze sadly at their silent machines" or something!I haven't done any circuit fault finding for decades, so I'm hoping the diagnostic flywheels will eventually come back up to speed, though I'm more familiar with audio and radio. Is there a diagram anywhere showing expected voltages or signal shapes at different parts of the circuit? Though I'm heavily suspecting the power section.
All the more motivation to get on and build the kit!