[Jukebox-list] Wurlitzer 1900 Selection Problem

[Wesley Dean]

    Mark, it is obvious from your info, that the driver coil is not 
operating when D is selected. And it is obvious also that B & D does not 
operate when B is selected. You say that you have a basic understanding of 
the selection sequence. Does this also include your ability to read the 
schematic? This especially necessary on Wurlitzers with the many connections 
involved. I would suspect that the B & D circuits are incomplete from the 
keyboard to the respective coils. This is where a test lamp would come in 
handy. I have compiled sheets on the procedure of using such a device. It 
will be sent to you if you are interested. Wes
----- Original Message ----- 
From: <mark.biskowitz at effem.com>
To: <jukebox-list at lists.netlojix.com>
Sent: Wednesday, June 14, 2006 7:34 AM
Subject: [Jukebox-list] Wurlitzer 1900 Selection Problem


>I am hoping someone might be able to help.  I am in the process of
> restoring a Wurlitzer 1900.   This model has 104 Selections - 4 letters
> (A, B, C, D) x 26 numbers (1-26).
>
> Problem I'm Having:
>
> Whenever I make any A or C selection it works perfectly (from beginning to
> end - right pin pops up and selects right record).
>
> Whenever I make any B or D selection, I get the A-Selection (with the
> appropriate number).
>
> Examples:
>
> Select A15 = get A15
> Select C23 = get C23
> Select B8 = get A8        (A8 pin pops up not B8)
> Select D13 = get A13    (A13 pin pops ups not D13)
>
> I think I have a basic understanding of what is supposed to happen when
> selection is made:
>
> When select A button:  no circuit to operating components, rotating plate
> / rocker assembly stays put and A selection is made
>
> When B or C selected:  Circuit should energize Stop Magnet B or C and
> driver solenoid, actuate stop arm B or C, and the rotating plate / rocker
> assembly will shift (until it hits Stop Magnet) so right selection is
> made.
>
> When D selected:  it appears there is no stop magnet / arm but the driver
> solenoid only and the rotating plate / rocker will travel full distance it
> has to in order to be aligned with D Pins.  .
>
> Since C works perfectly it appears that at least its circuit is getting
> energized and its stop magnet and the drive solenoid work properly.
>
> However ,consistent with B or D not selecting properly, when I observe the
> rotating plate I see that it is not moving or shifting (like with C
> selection).
>
> Therefore, although I see what is happening I'm at a loss as to what I
> need to do to troubleshoot the B and D selections.    As mentioned, I'm
> trying to fix this up so I have never seen it work properly.
>
> Any advice or suggestions would be greatly appreciated.
>
> Thanks
>
> Mark
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