Hello! New member to the site and forum, but have been reading here for quite a while.
I'm helping resurrect a couple of old Mitsubishi F1 wire EDM units (yes! 1984 is here again). Got one up and running again, working on the other. Currently the faulty unit fires up pretty nicely - wire feeding, alignment completed, pumps running and AVR (external power supply) operational (works fine on other F1 unit after a main capacitor replacement). I've loaded the boot tapes and also a proven part tape (RS232 board not working right now). Pressing Start gets everything fired off, and the unit moves the wire toward the material. All seems well until the wire is nearly in contact, at which time the unit drops out of "Working" state, drops the working voltage to zero and shuts down with the alarm light lit. A look at the AVR shows its alarm light has also been triggered. Contact light not lit, but wire right there...
Any idea what the cause could be? Bad connection, bad circuit board, other?
I'm helping resurrect a couple of old Mitsubishi F1 wire EDM units (yes! 1984 is here again). Got one up and running again, working on the other. Currently the faulty unit fires up pretty nicely - wire feeding, alignment completed, pumps running and AVR (external power supply) operational (works fine on other F1 unit after a main capacitor replacement). I've loaded the boot tapes and also a proven part tape (RS232 board not working right now). Pressing Start gets everything fired off, and the unit moves the wire toward the material. All seems well until the wire is nearly in contact, at which time the unit drops out of "Working" state, drops the working voltage to zero and shuts down with the alarm light lit. A look at the AVR shows its alarm light has also been triggered. Contact light not lit, but wire right there...
Any idea what the cause could be? Bad connection, bad circuit board, other?