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Post by fallsnative on Aug 10, 2022 1:15:43 GMT
I have a 1964 Rockola Princess, model #424. There is no sound when the record plays. One day everything was fine and the next no sound. I have owned this Juke for 25 years with no problems ever.
I downloaded the manual and have started the troubleshooting. I also contacted the gent who sold me the machine and he suggested I purchase a new needle before conducting any serious parts replacement. I did that, no change in status.
I put a meter on all tubes everything is working. There are no loose cables or connections. There is no signs of anything having burnt out. There is no "hum" when the record plays, just an incredibly faint sound of the music. I have disconnected the external speakers, no change. I change from "mono" to "stereo" and back, no change.
The manual suggests I get a 1.5 V battery and solder leads to each end to troubleshoot. Any more modern type of tool that anyone can suggest I use to troubleshoot?
Any advice is greatly appreciated.
Chris
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Post by jukenorman on Aug 10, 2022 16:51:49 GMT
Hi Chris,
Maybe the first thing to check might be the power supply voltages since both channels are affected? Also if you require further assistance, you should post the model number of the amplifier. The original 424 amplifier was a transistor amp. so it would appear that your one might have been replaced at some point - in which case what you are reading in your 424 manual would not apply. I also don't understand what you mean by "I put a meter on all tubes everything is working"?
Norman.
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Post by fallsnative on Aug 14, 2022 20:24:24 GMT
Hi Norman, thank you for the response and information. The amp in there says 40218-2-A. I assume its the original. The black component mounted on it seems newer to me, however I am unfamiliar with exactly what it is and what its function is. While having been an owner of this juke for some time I am not electrical savvy. When I said I put a meter on the amps and fuses, I checked what fuses I could by removing them and checking them with a meter. I honestly dont know where to go forward at this point. Chris ![]() |
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Post by jukeboxmarty on Aug 14, 2022 21:24:41 GMT
The 40218-2-A amp is original to the machine and is in fact Solid State... No tubes.
It would be good to know as Norman asked what you checked and where. Besides checking the fuses, did you check any DC voltages in the amp? If so, what voltages were indicated?
Is that faint sound of music coming through the speakers?
-Marty
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Post by jukenorman on Aug 15, 2022 9:12:51 GMT
Hi Chris,
Is the guy you bought the jukebox from nearby, could you maybe get him to check over the machine? You may have to send the amplifier out for repair but it would be worth getting a second opinion first, I think. Is the black component you mention the output transformer (top left hand corner)?
Norman.
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Post by fallsnative on Aug 18, 2022 20:34:12 GMT
The 40218-2-A amp is original to the machine and is in fact Solid State... No tubes. It would be good to know as Norman asked what you checked and where. Besides checking the fuses, did you check any DC voltages in the amp? If so, what voltages were indicated? Is that faint sound of music coming through the speakers? -Marty Marty, thank you for the information. I did not check the DC Voltages, I will do that next. The faint sound is not coming from the speakers, at least I dont think so. It is so light you can only hear it if I stick my head into the Juke down near the turntable and hear it. Chris |
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Post by fallsnative on Aug 18, 2022 20:37:51 GMT
Hi Chris, Is the guy you bought the jukebox from nearby, could you maybe get him to check over the machine? You may have to send the amplifier out for repair but it would be worth getting a second opinion first, I think. Is the black component you mention the output transformer (top left hand corner)? Norman Norman, the guy I bought it from is nearby, unfortunately hes dealing with serious health issues and isnt in his shop much lately. When I explained to him what was happening he believed it was the Amplifier too. The black component must be the output transformer in the top left corner. It just stands out as it seems more "modern" than some of the other components to me. I tried posting a picture but couldnt get that to work. I'm going to continue to troubleshoot and see if I can get this thing out to the guy who has the shop. I appreciate all the help Norman, Chris |
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Post by jukenorman on Aug 19, 2022 8:12:07 GMT
Actually Chris, I don't believe that is an output transformer (clue, stereo - there would be two!). I don't think I have a decent diagram of that amp. but looking at the Vern Tisdale scanned copy, it looks like it is a power transformer. The output transformers are on the audio distribution unit.
Norman.
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