Seeburg HF100R Free Play

I know this question is like asking, "how long is a piece of string", but here goes.
I have a HF100R set to "free play" and I want to change it back to coin operation.
All the coin gear is present and connected.
No free play adapter plug is in use.
Selection solenoid and selection lights activate as soon as the jukebox is powered up.
Any suggestions how this may have been jumped, so that I can return it to coins again?

Hi Keith,
Are the "rotary switches" in the CCU, up, in the play position, or are they all down, as they should be ??
Ron Rich

All down, Ron.

Hi Keith,
Great !! OK, now "l@@k for" a jumper between pins 1 and 6, on the large plug/socket going to the CCU. Unplug that connection and meter it to figure out which side it was added too--remove it, and you are done ! --I hope-- ( I STRONGLY advise that All Seeburg's, on free play, OR, coin should have an electronic latch bar solenoid saver installed --yes, I sell them).
Ron Rich

Thanks Ron,
As usual you were spot-on.
I have had that connector on and off about a dozen times and I never noticed that there was a fine piece of wire wrapped around pins 1 and 5.
Removing it did the trick.
The only problem I have now is that the left-side lamp, on the record rack covers, isn't working.
The bulb is good.
Funny thing is when I meter the cables and connectors.
The plug in the back of the jukebox, that plugs-in next to the Tormat, meters 6.5vac.
The lamp socket on the right (the one that works) also meters 6.5vac.
The lamp socket on the left (the one that doesn't work) meters 6.5vac were the cables are soldered to the socket, but nothing at the center pin, and still nothing when I short the 6.5vac wire directly to the center pin.
It doesn't make sense to me?

Update,
The light in question came on.
While it was on it was flickering a little.
Now it has gone off again - correction, the bulb is lit, but very very dimly.
At one point I thought it had something to do with the "select" lamps, as it seemed to brighten when I move the cables to those lamps, but I now think that was just coincidence.

Hi Keith,
Iffin, you have a model R that is equipped with a "Tormat", I wanna see it !
The R, like all Seeburg 100's, up thru the model JL, was equipped with a 'S(olenoid) A(ssembly) U(nit)'--aka "pin-bank".
That lamp problem is somewhat common in them--the socket is failing to conduct current. Either the center, spring loaded contact, or the stationary contact, or both, is bad. SOMETIMES, this can be "cured" by slightly "spinning" the tabs that the wires are attached to. Other times, carefully applying Deoxit-5 to the center contact spring-loaded shaft will work. Also, check that the end of the spring, where it contacts the lamp is clean. If the problem is common to both lap holders, often time the plug/socket is to blame. A replacement socket, is the only "sure cure" sometimes. Ron Rich

Thanks Ron,
I intended to say pin-bank, honest!
The problem with the lamp is certainly the center pin. I have some D5 and will try that.