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Post by jukeboxer on May 27, 2024 2:20:38 GMT
Hello, I'm still working on this Rockola 434 Concerto but this is a general voltage question. I've finished cleaning up the power distribution and before I put it back I'd like to make sure it's doing what it should be doing. I finally found a good schematic, and I want to make sure I'm reading it correctly and that I'm measuring voltage correctly. I am dealing with the plug I have outlined in the linked image. I am using a multimeter set to 20V, and placing the ground in one of the "black" holes and the red in one of the "red" holes, doing my best to touch the metal inside both. I'm getting bits of fluctuating numbers on my mulitimeter, so at minimum I can verify that I've got the power distribution assembly switched on.
1. Is my method the best way to measure output? I don't work with multimeters often. 2. Am I correct that I am looking for 6.3V in each of the "red" holes?
Any other helpful suggestions are welcome as I make my way through this jukebox. Or if anyone has any idea where I can get this schematic scanned. It's quite large. Thanks for your time!
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Post by jukenorman on May 28, 2024 10:09:32 GMT
No - if you are looking for 6.3V there, you need to measure at the two corner pins above the ones you have marked (where the green wires go). Set you multimeter to AC Volts.
Norman.
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Post by jukeboxer on May 29, 2024 0:35:55 GMT
No - if you are looking for 6.3V there, you need to measure at the two corner pins above the ones you have marked (where the green wires go). Set you multimeter to AC Volts. Norman. Norman,
Thanks a bunch for educating me on the finer points of how to read a schematic. Armed with your words, it seems so simple and obvious! When I measured in AC with the two GRN pins, it indeed read around 6.3V. I've got one more, I got cocky and thought I knew what I was doing so I tried a second time. Touching the two pins marked in the attached pic, I expected to get 35VAC. However, I was registering about 14.5 every time. Is there a problem or am I doing something wrong again? Thanks again for everyone's time and energy. |
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Post by jukenorman on May 29, 2024 10:25:31 GMT
Yes it would appear that something is wrong there. I don't have that diagram for a 434; I do have the 436 diagram, all Rock-Ola power supplies are broadly similar and the 436 has the same secondary windings. In the 436, that 35VAC winding is shown not connected - it is probably for some auxilliary use? So in your case it may not affect the operation of the jukebox but I do find it strange that it is reading so low.
Norman.
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Post by jukeboxer on May 29, 2024 10:45:31 GMT
Yes it would appear that something is wrong there. I don't have that diagram for a 434; I do have the 436 diagram, all Rock-Ola power supplies are broadly similar and the 436 has the same secondary windings. In the 436, that 35VAC winding is shown not connected - it is probably for some auxilliary use? So in your case it may not affect the operation of the jukebox but I do find it strange that it is reading so low. Norman. Thanks again for your help. I appreciate it! |
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Post by armandh on Jun 10, 2024 2:35:57 GMT
I also note the + and - signs on the bridge rectifier are wrong or the bridge is drawn wrong.
given this
the wrong voltage on an unused winding is not a stretch.
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