Hi,
I have a 1994 Haas VF4 wired 208 3 phase that has a 102 servos off and 160 low voltage alarm. I've researched this board and come up with a few things, but have a couple questions. On the servo distribution PCB, what should the voltage be into it? I pretty new to working on these, so you'll probably have to bear with some silly questions. I'm assuming that the input is on the upper right side of the board, with the wires labeled 91u, 92v and 93w? I've checked my voltage into the machine and it's what it's always been, a solid 121.5 volts. Voltage into the transformer is the same. I check voltage at (what I assume is) the input of the distribution PCB and it measure this -
91u - 84.3
92v - 64.1
93w - 79.5
I went to the power supply board to check voltages there. I checked the 3 wires coming out of the bottom right and the 3 wires on the lower right. This is the voltages I get there -
PSUP 74 - 84.3
PSUP 75 - 64.2
PSUP 76 - 79.5

91u - 84.3
92v - 64.1
93w - 79.5

Any ideas?
thanks in advance for your help.
shawn