If the readout shows movement but all three axis do not move, then it means that the control side is seeing everything as Ok but the drive side is dead. remember these machines have an open positioning loop. There are no encoders. the control puts out pulses and hopes the axis move.
BTW, look at the LSI-11 board, if it has 4 big LSI chips, it is a BOSS 4, and if it has 5 large LSI chips, it is a BOSS 5, but the rest of the boards must match. The ERS board actually has the BOSS software on a PROM toward the bottom of the board.
I would be checking the 54 VDC power, as well as all fuses related to the drives. The AC fuses are in the back cabinet, the DC fuses in the side cabinet. Do you have the maintenance manual? It has a trouble shooting section, advising where to check for what voltage.
George |