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

[Ron Rich]

Answers in text, below, at (<)---Ron Rich

Gregor Anich <blight at blight.eu.org> wrote:    Hello!

Thanks for all the help and tips so far!
<You are welcome !
I will not use WD-40 anymore.
<Great
  
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"
   
  <I think--not sure--"BO" stood for "Bonus", and "AC" for "Accumulator"
  
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 believe that the number you see on the board is the number for the board only--no parts installed
  
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.....
  < Some times people do some strange things---Can be "fun" --once you find "it" !

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.
  < All above is the correct sequence of operation
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.
   
  <does it rotate twice ? If so, the "override switch" is operating as it should.

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.
   
   <Hint--Maybe--The "signal numbers" that you refer to above (71-64) WERE wire colors designators in older phono schematics--I don't know if that is still true on that model. If true #64 should be a yellow wire, with a blue tracer. 
  
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
   
  < I think that you have found the problem--

Going to bed now, good night!
   
  < me too--good night backatcha--

- greg



 
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