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

[Ron Rich]

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

Gregor Anich <blight at blight.eu.org> wrote:  Now most things of the Wurlitzer seem to work. Some letters/numbers might not 
work but all the other stuff seems good :))

I ordered some 0.56mm wire to rewind the SIDE 1 SOLENOID. Should have used 
0.5mm wire cause now it has only 330 windings and 2.2Ohms resistance - but it 
works and I think it should be OK because it must not get current for more 
than a few seconds - the original 3.5Ohms magnet would melt after more than a 
few seconds too. Maybe I put a 1 ohm resistor and/or a fuse in series with 
the new solenoid...

- greg


On Thursday 08 February 2007 11:14:19 Gregor Anich wrote:
> Hello!
>
> The Wurlitzer now kind of works :-))
>
> I don't know what was wrong last time when the magazine didnt start
> rotating, but maybe the problem was that the "service switch" ("service
> technicians only") was in the wrong position... ;)
>
> Another problem was that the playback was stopped as soon as it started - I
> found out that this was because the PLAY SWITCH was not switched when the
> tonearm was put onto the turntable - the disk which switches the PLAY and
> CANCEL switches was in the wrong position.
>
> The 8A fuse in the control box always blew for odd selections, not for even
> ones. After looking a bit at the schematic I suspected the SIDE 1 SOLENOID.
> And indeed the SIDE 1 SOLENOID is shorted.
>
> I already took apart the solenoid and ordered some wire to rewind it. It's
> about 390-400 windings of 0.5mm copper wire, about 31m long with a
> resistance of about 3.5 Ohms.
>
> Does anybody happen to know if 3.5 Ohms is the correct resistance for the
> SIDE 1 SOLENOID? The solenoid is connected to 28VDC by the SIDE 1 READOUT
> SWITCH and at 3.5 Ohms that would mean 8A/224W - seems like too much
> current/power to me if it is applied for more than a few seconds.
>
> Thanks,
> greg
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