Seeburg m100b selection problems

Hi i have a seeburg m100b. Ive fitted a rebuilt stepper unit and gone through the selection buttons. If you select a record it makes all the right noises and buttons work but it wont fire a pin. If i flick a pin by hand it will play that record. Im totally stuck as everything seems alright. Any ideas would be great

Does it work from the ES ?
Ron Rich

hi it wont select from the buttons if I flick a pin by hand it plays that record. I swapped my stepper unit to my dads m100c and it makes his do the same, so its down to the stepper unit. its been rebuilt looks like new and points look good, what would I have to look at? buttons and pin banks ok something must be up with the stepper/selector unit

If it won't "flick a pin" from the ES or stepper, it almost has to be the fuse that sits in the "outboard" fuse holder on the WSR. This MAY have a tag stating it should be a 2 amp slo blo type fuse-- In many cases, this is too large--MAXIMUM, IMHO, is 1.6 amp ! This fuse clip is subject to not contacting the fuse well--squeeze it tight, assuming the fuse is good--check the size and the fuse itself with a meter. Replace the holder if not able to tighten it.
Ron Rich

that's interesting ill have a look when I get home, I did put a fuse in it and it fits tight. if the fuse is making a good contact and not blown could it be the wrong size fuse making a problem

Generally speaking-- a fuse that's too small will blow instantly--a fuse that's too large will not blow--but something else (in this case an individual coil), will. Ron Rich

Your right blown fuse. I put a new one in and it blew it the second i selected. Whats causing that? I unplugged the pinbank plug and tried again and it blew it again

Just to add. With everything unplugged it still blows the fuse when i make a selection also i put the old unit in and made a selection and it blew the fuse in that. Key pad maybe?

OK--I'm confuzzed !
1. What size/type fuse are you using ?
2. What/which "old unit" did you put in, where ??
Ron Rich

Hi sorry the wsr5-l6 unit is blowing the slo blow fuse. Ive changed it as had another wsr5-l6 unit and blows slo blow fuse also. Im guessing the selector assembly is not right? As its doing it with everything unplugged. Book says to use a 2a fuse

My Service/parts manual says a 2amp, slow blow--which as I wrote earlier, IMHO, is too large !
If blowing this fuse, the problem is in th CCU--with the power OFF, push the cancel coil plunger in with your finger--it MUST "snap" back vigorously ! If it won't do that, I strongly suggest the CCU needs to be oiled with 20 wt oil on all of the parts that move EXCEPT the coil plunger--also check that the grass core stop is still in place and the coil itself is correctly adjusted. If it does snap back, you have internal contact problems in the CCU. see the service manual for proper adjustment procedures. Ron Rich

Thank you for the reply. It seems to be in perfect order but still blows the fuse. Ive been over everything. All i can put it down to is that the chap that rebuilt it has wired something wrong? As everything looks spot on.

Forgot to say. What you say core stop. Which bit is that exactly. I have compared everything to my dads working unit and i cant see anything missing

The core stop is the piece of brass that "should be" inside the rear bracket of the subtract plunger ( same thing {larger size},is used in the detent coil on later version 100 B;s thru the SMC models). Ron Rich

Sorry to be a pain. You wouldnt have a picture of that would you? So i get the right bit. The brass bit. Ive spent hours today looking for the problem. I cant find anything. All looks like brand new all great connetctions. Its starting to drive me mad