Vintage Synth Repair

Hi, there are loads of point to check the
voltages..the psu in the bottom left of the schems..

Have a look round the edges of the schematic
drawing..it shows the voltages and the various symbols
that identify the voltages all over the schematic...3
+14 is a black triangle, -5 is a white triangle, +14
is a half black, half white triangle..the +5 is a dot
with a line through it, +9 is an arrow..etc.

Pin 40 on the CPU should be -5, pin 26 is +5 etc
etc...

Phil.


--- inocencio66 <paulo.simoes5@...> wrote:

> --- In vintagesynthrepair@yahoogroups.com, Philip
> <eggwheatis@...> 
> wrote:
> 
> > The service manual isn't too great I agree, but I
> can
> > see +9 fed in externally then the internal psu
> > generates +5, -5, +15, +14, with all the points
> marked
> > on the schematic.
> 
> > 
> > Phil.
> 
> One more thing: Where exactly are the cheking points
> for the +5 and -
> 5? (Assuming +15 and -14 are for the synth section
> only)I can only 
> see a +5v mention next to vr1. 
> 
> I may be misinterpreting some symbols in the
> shematic and wouldn\ufffdt 
> want to read/adjust voltages with the voltmeter
> connected to the 
> wrong side of a resistor or something... All I could
> measure well so 
> far were +4.8v at cpu chip\ufffds pin 40.
> 
> Thank you.
> 
> 
> 



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