by Rob-NYC »
Sat Jun 21, 2014 4:21 am
For those dealing with this sort of problem and not "blessed" with a manual, some basics:
There is a small single conductor wire coming from the pin memory. This wire when grounded completes the circuit that pulls-in the Play Control relay in the stepper box. Disconnect it using the small plug on its cord. If mech stops scanning, something is shorting the scan contact rail to ground even when a pin is not selected.
If the mech keeps scanning with the scan wire disconnected the problem is either in the mechanism's "carry over" contacts not opening as the clamp opens, or in the selection receiver. Open the stepper box and look for the play control relay at the left of the letter stepper. It's contacts only have two large wires. With mech scanning check if that relay is pulled-in. If it is, --carefully-- (120vac here) tap the phenolic contact guide and see if it then releases. If it does, the relay armature is either gummy or has residual magnetism.
If it stays energized you'll have to trace it back through the aforementioned 'carryover" contacts in the mechanism.
I haven't had one of those E-M Seeburgs in over 26 years so there may be a point or two I left out, but the above are the basics.
Rob/NYC
"If we believe absurdities, we shall commit atrocities" -- Voltaire