[Jukebox-list] Missing part of Wurlitzer 3700 Service Manual

[Gregor Anich]

Hello!

Thanks for all the help and tips so far!

I will not use WD-40 anymore.

Today I collected some more information about the box.

The BO/AC case says "Model No. 555" and the CONTROL BOX case says "Model 3700 
BO/AC"
The "diode board" in the control box has 141107 on the back but looks like 
part no. 138870 in the manual.
The triac board has 140765 on the back but looks like part no. 140764 in the 
manual.

I have traced the problem with the selection accumulator latch solenoid back 
to the rectifier D31-D34 on that "diode board" in the control box. It seems 
like it was broken and someone replaced it with an integrated rectifier, but 
he mixed up + and - so +28VDC and -28VDC were swapped.....

I fixed it and now the box behaves a bit different ;-)

First of all, when I activate the free-play switch the selection accumulator 
doesn't start rotating immediately anymore, it starts when a letter and a 
number were pressed.
Then the correct latch pin is released by the solenoid in the selection 
accumulator, it stops rotating and the keyboard switches are released.
Nothing else happens.

The override and lock solenoids work, when putting the scan-load-run switch 
into the scan position and then switching the service switch the magazine 
starts rotating.

When the scan-load-run switch is in the run position the magazine lock 
solenoid should get current from signal 71 which is connected with a 10 Ohms 
resistor and 0.47 uF (?) capacitor in series to signal 64.
Signal 64 comes out of the triac board from TR1.
There's a override relay which is activated/swiched as soon as the jukebox 
gets power and which connects the gate of TR1 to GND when it is active (I 
checked that with the DMM)

I measured the voltages on the triac board for TR1. There are 24VAC at input 
T1 and 0VAC at the output T2.

My guess is that it is broken. It was replaced by someone with another part 
already which has "SSC TXAL 2210B 7822S" written on it - I did not look it up 
yet (too late) - the other, original triacs have Q2010L4 written on them.

Going to bed now, good night!

 - greg


On Wednesday 31 January 2007 18:02:21 Ron Rich wrote:
> OK--The "pricing" unit is also often refered to as an "accumulator"--Which
> leads to the question, which pricing unit, if any, is in that phono. Wurly
> calls this either a "playrac" or "BOAC"--If a BOAC, which one)?? Ron Rich
>
> Gregor Anich <blight at blight.eu.org> wrote:  Hmm...
>
> In the manual they call it the "selection accumulator" - it is the thing
> below the record magazine with 200 latch pins which should be activated by
> the keyboard switches. There are 2 magnets inside which start rotating when
> "enough credits are in the box" (using the free-play switch) and when one
> if them is at the appropriate position it should get current from the
> keyboard switches and release the latch pin from the accumulator.
>
> We put the gripper arm all the way down, and when we put the "load - scan -
> run" switch into the scan position and then switch the "service switch"
> (the one which says "technicians only" right to and in front of the record
> magazine) then the record magazine starts rotating. I don't know if this
> bypasses the override switch or not (would have to check ;)) but when i put
> my DMM onto the keyboard switches there is no voltage there which they
> could switch.
>
> About the broken "C" switch - of course it will cause any switches after
> "C" not to work properly, but atm we are trying to get "A1" working.
>
> -greg