I have SR560 on the shelf in need of repairs, looks like digital issues, so I'd like to try replacing firmware PROMs on it.
On power up bunch of LEDs show up together and zero reaction to buttons/controls. Replacing caps for power supplies didn't change anything and power rails are ok.
But need a dump from a good unit, hopefully someone has one and can copy it.
Firmware is stored in usual UV PROM in position U504. In my unit it is already socketed and easy to get to.
Hello all,
I have SR560 on the shelf in need of repairs, looks like digital issues, so I'd like to try replacing firmware PROMs on it.
On power up bunch of LEDs show up together and zero reaction to buttons/controls. Replacing caps for power supplies didn't change anything and power rails are ok.
But need a dump from a good unit, hopefully someone has one and can copy it.
Firmware is stored in usual UV PROM in position U504. In my unit it is already socketed and easy to get to.