Analogue-sequencer

Fred,

> >the middle pin. from that to the third pin (output), the voltage 
registers
> >as .776v.
> 
> 
> .776V sounds like 1 diode drop.  I bet you have a diode mounted 
backwards
> right near the power supply

Dave's right. Does sound like a diode drop. But you say that it 
measures 0.776V even when after you have removed the zener D1 so 
that's out of the equation. Next check the orientation of the 4 
diodes around the midi/sync socket. If this all checks out OK, then 
hopefully you have socketed all of the ICs. If so, then I would 
remove all the chips, the IDC connectors and the backup battery then 
remeasure the voltage at the regulator output. If the output still 
measures low, then suspect the regulator itself.

If it's OK at this point, and you get the required +5V, I would 
insert the IDC connectors one by one; each time powering up and 
checking the +5V. It would still be worth doing this , even if all 
your chips are soldered in, just to check the integrity of the ribbon 
connectors and associated boards.

If these all check out OK, then re-insert the chips one by one, each 
time powering off when you insert the chips, then switching back on 
and checking the regulator output. See if any of the chips drag the 
voltage down. Leave the microprocessor till last.

Let us know how you get on.

Good luck

Andy
---

Andy Wilson
http://www.techman.synth.net
andy@techman.synth.net