[Jukebox-list] Missing part of Wurlitzer 3700 Service Manual - It finally plays a record :)

[Gregor Anich]

On Friday 09 February 2007 18:49:53 Ron Rich wrote:
> If I recall correctly, it only gets a "pulse". You might check out the
> circuit that provides that "pulse" as there should be no reason for that
> solenoid to have gone bad. Unless there is a mechanical "drag" on the
> solenoid, or the "pulse" is being kept on (such as a "sticking switch?) too
> long. Ron Rich
>

Yes. The solenoid gets current as soon as the READOUT SWITCH #1 hits a latch 
pin from the selection accumulator and until that switch goes back.
The switch goes back when the latch pin is cancelled by the cancel magnet.
The latch pin is (or should be) cancelled as soon as the gripper puts the disk 
onto the turntable.

Now there's two possible things which could have happened I think:
1) The gripper arm somehow got stuck, and the latch pin was not cancelled soon 
enough to prevent the solenoid from melting. I found some pieces of a vinyl 
record around the gripper... ;)
2) One of the "side 1 switches" (which are actuated by the side 1 solenoid) is 
not 100% ok - it could cause the wrong cancel solenoid to get current thus 
the latch pin is not cancelled and the solenoid not switched off.

Does anybody know where to get those switches?
The manual lists it as part no. 128344 on Page 39C ("50. Switch (2)")

Thanks,
  greg