T32 Bus error

G'day guy's,

I've got a bus error on a QT18 that i have been trying to sort out. Does anyone know of where i can find the explanation of the bus error or how to locate the address in the error. The error i have is: Bus error0) (
Error at or near $004A00B0.

Thanks in advance

sudsy55 said:

G'day guy's,

I've got a bus error on a QT18 that i have been trying to sort out. Does anyone know of where i can find the explanation of the bus error or how to locate the address in the error. The error i have is: Bus error0) (
Error at or near $004A00B0.

Thanks in advance

Click to expand...

Maintenance book never explains this problem. That is taken from Meldas M300 which is very close to T32. I think it is this inter PCB boards communication bus and CPU doesnt see one or few PCB modules as present.

Thanks noname777. I will change a few when i get a chance and go from there. The machine was ok at first but long story ended up shorting the power supply wires to the monitor and took out a couple of tracks on the main panel board. I fixed them and changed the monitor and that works fine. The small memory board maybe419 i can't remember offhand but the cable goes from the main panel to this board. I pulled it out yesterday and had a look and some of the pins on one of the chips were bridged with solder and the one i pulled out of the mutiplex wasnt. I cleaned up the solder but was the same. I might swap them out tomorrow but change the software chip first. I did try the other board a long time ago but didn't make any difference but i didn't swap the chip