I have a Series I Bridgeport that was originally run under BOSS 5. I converted it to Mach3 using a Hillbilly's BOB. I still use the original BOSS 5 power supply and driver boards.
The other day, I was finally going to run my first true milling operation and was doing a dry run to check out my G-code when the X-axis abruptly stopped. Y and Z continued to function OK. I assumed that I blew one of the output transistors so I pulled the ones for the X-axis and checked them - all OK. I checked the DC fuse (FU12) and the AC fuse (FU15). Both OK. I tried swapping the SMD boards between the X and Z axis - X still won't work. Finally, I measured the voltage at FU12 (X-axis), FU13 (Y-axis) and FU14 (Z-axis). The Y and Z-axis read 37 to 39 volts, the X was at 3 volts so I concluded the problem was in the X-axis power supply.
My next step is to check the rectifier bridge that is associated with the X-axis but I can't seem to find anything in the manual that tells me where these rectifiers are located. I can see lots of rectifiers on and below the big heat sink that the output transistors are mounted on but which are which?
My questions are: Am I on the right track? Where are the X-axis rectifiers located? Is there anything else that I should be checking?
Any help will be greatly appreciated.