AMI MM-1 Selection Problem in one column.

[mixographer]

Hi All. I hope someone can help me diagnose an issue I'm having with an AMI MM-1. Any selection I make in the "2" column 
exhibits an off-by-one issue. For example, If I select G2, the record in I2 plays. This happens on every record in the 2 column. 
it plays the correct side, of the next record. I'm looking at the schematics, trying to understand how this issue would occur. 

Should I be concentrating on S2 and S1, or R1 and R5? The selector switch contacts? I'm having a hard time understanding why 
the "2" column selections are the only ones that are off, and maybe that is the best clue for someone who is familiar with 
these machines. 

Thanks! 

Jimmy

[jukenorman]

"If I select G2, the record in I2 plays", you said. But there isn't an I2, did you mean H2 (the next selection) or J2 (the next record slot)? Either way, I'm having difficulty getting my head around it! There is an MM-1 thread from January but I'm not sure if it helps with your problem?

Norman.

[mixographer]

Sorry for the confusion. It's the next record slot, whatever Letter that would be. If G2 then J2, if L2 then it plays N2, Q2 plays S2.... and this only happens on the 2 column.

[jukenorman]

I cannot imagine how it can be a "write-in" problem but I think you need to check that first. Since you have deemed the "1"s to be OK, make selection U1 followed by A2, C2, E2 etc and check whether adjacent pins in the search unit are being pushed.

Norman.

[mixographer]

Thanks for the response! I will try all the 1 column and see that the write in is working. When I look at the schematic, I'm looking at the inside of the search unit. I was wondering if there is something wrong in S1 or S2, but how is it failing only on the "2s" who knows. I have a picture of the relevant part of the schematic, but I'll need to figure out how to upload or link it. 

[jukenorman]

What I meant was a simple check - U1 plays OK, so select it (just so you know its location in the search unit), then select A2. Either the next pin to U1 in the search unit to U1 is selected (and C2 gets played) or the next but one pin is selected (C2) and C2 get played.

Norman.

[mixographer]

Thanks Norman. Makes sense! I'll try that next.