Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards

Many many thanks!!

The results form having 110v light in circuit and testing with voltmeter. 1 & 2 on 12v scale needle moved both ways(+ & -) on scale, moved very small amount.
1 & on 12v scale needle moved both ways(+ & -) on scale, moved very small amount.
3 & 2 on 12v scale needle moved both ways(+ & -) on scale, moved the largest amount. The light was on, but dim.

thanks for all your help!!

Why are you using a 12V scale? Aren't these 80V servo drivers?

Something isn't making sense here.

Thank you Andy!

The needle moved such a small amount on the 60v that it was hard to decide how much it moved. Even on 12v scale it was very small amount. This measurement is at the transformer not the PCB or capacitor.

thanks!

new2linux wrote: This measurement is at the transformer not the PCB or capacitor.

Why?

Also, you would need to use the AC setting at that point. (And DC on the other side of the rectifier)

You are trying to find out what the output of your DC power supply (not the transformer).
For example, you should connect your light between the terminals the brown and white wires that connected to the old servo amp, Then with your meter measure the voltage between those same terminals (with the light on however dim it may be).

Andy thanks for hanging in there with me!! You are a true gentleman all the way thru!!
This is how it should of been done, looking at the end of PCB (only did one side "x") referencing earlier pic of diagram:
40v = W & BR; 40V = BL & BR; 75V = W & BR (W=WHITE; BR=BROWN; BL=BLUE; the original color leads)
A 110v light bulb was jumper-ed to the leads in question, voltmeter applied to get reading.

Many,many thanks!

Edit:am I correct that the white goes to pin 5; brown and black (on pin 3 or pin 4) don't mater as much as long as the drive (rotation) matches the encoder and both amplifiers are the same.