Paul,
Yes, the board is (I think) a later model Fanuc 5T board. The EPROM chips on the board contain the software (firmware, actually) of the control, so be sure to not loose those. Pry them out very carefully and save them in conductive foam or (in a pinch) a sheet of styrofoam. Be very careful to document which sockets they came out of because every EPROM is numbered and unique. If the EPROMs on the A board ever get updated or replaced with others, remember that there are three more EPROMs on the smaller "memory & edit" board that have to be the same series and revision level in order to work.
Before you power up the new A board, plug all your old EPROMs in the correct sockets, and be very careful to not bend a pin. They like to "bend under" the EPROM so you can't see that they're bent. A bent pin will cause a "Christmas tree" where all the LED lights on the MDI panel are on. This just means that the processor is locked up.
The parameters and tool offsets are saved on a single static RAM chip (6508) in the top center area of the A-board. This one chip has the small battery backup for the parameters. A new board may come in with no battery, so you'll have to supply one or use the old one. You can substitute 3 alkaline AA cells, or you can make a jumper cable from the larger 3 D-cell battery on the memory board so they both share a larger battery. The memory in the parameter RAM chip goes to "All ones" when it looses power, so you may have to power up and erase the parameters in the new RAM chip before loading in the new ones. I've forgotten what the procedure is for erasing the parameters on power-up, but it's something like "hold RESET while turning on the power", or something like that. The Mantenence manual should tell you the correct procedure. Powering up with all "1s" in the parameters can make the control's servos behave badly. I always recommend pulling out the servo fuses before powering up the control with no parameters. If it's a slant bed machine, block the X axis from drifting down and just pull out the 3 indicator fuses and the 3 cartridge fuses on the back of each servo drive. The control can then come up "ready" but nothing runs away on you.
The smaller motors (0 and 5) have only 3 15A indicator fuses. The larger 10, 20, and 30 motors have 3 larger cartridge fuses and 3 1.3A indicator fuses in parallel. You'll have to pull them all to prevent the servo from moving. Remember that if the control comes up "ready" and any axis drifts out of position more than a small amount, you'll get a servo error that shuts down the servos. Once all the parameters are loaded, you should be able to put the fuses back in the servos and power it up.  |