07-06-2022, 05:05 AM
Hi Ernest,
Pulling D1 fixes the problem on all 3 'dead' RAM boards and has brought 2 more machines to life. The question is, what is happening to the left of D1? VBB is powering the SRAM while the main power is off, later inverter loops are to introduce a startup delay but my crap maths head can't work out the twin voltages and voltage divider even though I've watched Big Clive and Dave Jones explain it countless times. I should have Ohm's law embedded in my skull by now.
I should also say that none of the boards have batteries because they'd all gone bad. I'm thankful they were all off-board.
Cheers
Witchy
Pulling D1 fixes the problem on all 3 'dead' RAM boards and has brought 2 more machines to life. The question is, what is happening to the left of D1? VBB is powering the SRAM while the main power is off, later inverter loops are to introduce a startup delay but my crap maths head can't work out the twin voltages and voltage divider even though I've watched Big Clive and Dave Jones explain it countless times. I should have Ohm's law embedded in my skull by now.
I should also say that none of the boards have batteries because they'd all gone bad. I'm thankful they were all off-board.
Cheers
Witchy
--
Binary Dinosaurs, where RIFA capacitors come to die
www.binarydinosaurs.co.uk
facebook.com/binarydinosaurs
@binarydinosaurs
Binary Dinosaurs, where RIFA capacitors come to die
www.binarydinosaurs.co.uk
facebook.com/binarydinosaurs
@binarydinosaurs