Sorry, didn't see this one, I know it's been a few weeks. Power mate on a sh series machine is for the magazine. 1257 probably means you either lost batteries, or it needs zero return, or both. Some newer machines have a pmm screen to see alarms on the power mate, older ones require a handy to plug in. The red alarm lights should give you the basics in either case. I have the procedure for zero return if you still need it.