Beginning work on Seeburg LS1

I have begun work on my good friend's Seeburg LS1, and am in the process of ordering a manual.
It played fine until today, when I tried to play a record on slot C8 where it jammed. The slot was not empty. The mechanism would either fail to grab the record and would play nothing in the slot, or something would get jammed and a loud hum could be heard.

After this occured, the mechanism does not respond to song inputs at all anymore.

The machine also did some other weird things before this (while still managing to work):
-Occasionally the mechanism would scan back and forth repeatedly after some songs. This got very aggravating and sometimes never stopped.
-The mechanism's resting place is selection R8. This does not seem correct. Isn't it supposed to rest at the very far left?

The machine was modified to play without the coin system. So some of the coin acceptor and other related pieces are missing.

Thanks for any help, as it would help me avoid scratching my head for hours over this.

I have a few suggestions---
First, purchase the manual from either http://www.victoryglass.com or http://www.alwaysjukin.com so that you get the whole manual package. I would also recommend that you purchase a copy of (the late) Tony Miller's "Console Era Seeburgs"--and may I suggest my Seeburg Mechanism Guide, might tend to be helpful.
At this point, I would further suggest that you do nothing till after reading the above, so as not to do "more harm, then good".
If you don't want to wait--the C-8 issue is probably a bent record seperator--or a screw or something of that nature jammed into the slot.
The "does not respond to song inputs" needs a better description--are you able to operate the TES, Does the Mechanism scan, or is it just failing to detent ?
The scanning and resting place problems are probably both caused by a "sticky coil" in the scan control unit in the SCC.
Ron Rich

The "does not respond to song inputs" needs a better description--are you able to operate the TES, Does the Mechanism scan, or is it just failing to detent ?

By that I mean that when you press a song to be played, the relays will click and act like they normally do, but the mechanism does absolutely nothing. It just sits there.

Is the service switch in the play position ? Is the motor running-- (getting power, or "jammed") ? Ron Rich

I made sure the service switch was in "play" position. I felt the motor and it was hot, which made me wonder two things:
-It was jammed, or
-the motor capacitors were failing

Since I don't have the manual yet, what does SCC mean in the following quote:

The scanning and resting place problems are probably both caused by a "sticky coil" in the scan control unit in the SCC.

What is a good way to fix a "sticky coil"?

This type of a problem comes up every once in awhile--and I don't ever know how to handle it--
I do not want to insult you, nor discourage you, nor sound like a "smug know it all", but it appears to me, from the above posts, that you may have "bitten off more then you can chew"--It's my opinion that you need to sit down with someone that has great electro/mechanical skills and read the books listed in my first post before you do anything else. You might also be able to find an adult school, that will take on the phono as a class project. I fear that you have already caused some damage to that phono--how much, I don't know, but I would advise you to un-plug it, at least for now. You may also wish to go another route--the local phone books in your area usually have listings for "Jukebox" or "Amusement device". You might also try the nearest big city phone book and see if you can hire a pro.
Sorry, but I don't know any other way to put it-- Ron Rich

I have read up on the service manual, and I placed the entire combined magazine and select-o-matic unit on an adjacent table for easy access. I have reconnected all the necessary cables and powered on the unit, and once again tried a selection.

What I saw was that the trip relay would activate and stay energized. I'm not sure if this a jam, or something worse that requires complete disassembly.

Any ideas?

That suggests that the 3M-1 contacts, or the relay contacts are dirty/pitted/maladjusted.
Ron Rich

Good news. After poring over it for hours, I found that the problem was a stuck clutch. After degreasing said clutch, the mechanism began to play records like nothing had ever happened. Burnishing contacts 3M1 and some others with 600-grit sandpaper also seemed to improve smoothness.

What is the recommended lubricant for the clutch mechanisms?