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Post by gassyjohn on Jan 23, 2021 12:36:47 GMT
Hi, I have a Wurltzer 1800, 1955. When a record starts to play, it blows the 2amp fuse in the amplifier box. I have disconnected the speakers and it still blows the fuse, everything else on the box seems to works okay. I have been away and the box has not been used for about 6 months, not sure if that had something to do with it like a surge.
I have removed the amp-box (which is mind blowing inside) there is no sign of and shorting or burning. My question is, would the fault be in the amp-box or could it be with the corba stylus.
I know I will have to have an expert look at it but and interested to know how and why this fault might have happened.
Help anyone!
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Post by Ron Rich on Jan 23, 2021 13:14:53 GMT
Which, "2 amp fuse" ? Ron Rich
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Post by gassyjohn on Jan 23, 2021 13:23:52 GMT
Its the top 2amp fuse which is sited above the wording Amplifier.
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Post by Ron Rich on Jan 23, 2021 14:34:37 GMT
Sorry-- that ain't no help-- is there a description on the paper under the fuse ? Ron Rich
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Post by gassyjohn on Jan 23, 2021 19:59:05 GMT
Yes there is a description, it said 2amp AMPLIFIER fuse. It's not on paper it printed on the box itself.
The other 2amp fuse which is okay is just below the amplifier fuse. The lettering on the box under this fuse is either 10 or LO, DC volts.
The colour of the wires on the 2amp ampilfier fuse is a single brown at the bottom and two joined together white wires and one of these wires goes to the off/on switch on the box the other goes elsewhere.
I hope this helps. I might be able to get a picture over.
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Post by Ron Rich on Jan 24, 2021 2:29:13 GMT
Sorry-- I can't recall that one-- gonna need to read the schematic--see what it fuses-- Ron Rich
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Post by gassyjohn on Jan 26, 2021 10:04:49 GMT
Hi Ron, unable to send picture
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Post by juker2108 on Jan 31, 2021 18:11:47 GMT
I have a manual for the Wurlitzer 1800 and it has a model 528 amp. The diagram shows severak fuses on the side: 2amp, 15amp and 8amp. I suspect that's the 2amp fuse you're referring to. I took a picture of the phonograph circuit and it shows a 2amp fuse on the output of the 28volt AC/DC rectifier that feeds letter selection switches, the goes to the cancel solenoid and onward. I can send you a copy if the photo if wanted.
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Post by Ron Rich on Jan 31, 2021 23:48:40 GMT
Hi John,
If you don't have the schematic, see our FAQ's section and purchase the Service Manual. If it were me working on it, I would suspect the basket/lift arm motor is "dirty". "Clean it", and replace the fuse-- see what happens-- Was that fuse the correct type/size ? Ron Rich
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Post by gassyjohn on Feb 1, 2021 9:46:01 GMT
Hi Ron, thanks for your reply I will look at the liftarm motor and test. The fuse is the correct size.
I have just purchased a service manual and I located the 2amp fuse which is blowing. It is connected to the "AMP. Power Transfomer" the "TURNTABLE MOTOR" and "OVERRIDE RELAY".
It said when the "override relay" closes its contacts it supplys 110volts AC to amplifier,power trandformer and turntable motor. Do you think the transformer is at fault?
Like I said before, everything seems to work, you press the buttons, record selector turns, the arm picks-up the record and starts to play but on sound and when I checked the fuse it has popped.
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Post by gassyjohn on Feb 1, 2021 11:09:20 GMT
Hi Ron, just an update.
I have now located the 2amp, fuse is blowing as soon as the turntable operates.
The turntable continues turning afterward till the record is selected, then it plays the record till the end, then rejects and then it stops.
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Post by Ron Rich on Feb 1, 2021 13:25:32 GMT
John,
Just guessing-- pull the 5U4 tube and see if it still "blows"-- If so, it's either a bad tube, or bad hi voltage circuitry, inside the amp. Ron Rich
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Post by gassyjohn on Feb 3, 2021 13:58:09 GMT
Hi Ron, I removed the 5U4 tube and the fuse did not blow then I noticed I had not connected the AUX AMP cable, when I connected the AUX cable and tested again the fuse popped.
1, The 2amp fuse blows when the 5U4 tube is fitted and the AUX Amp cable is connected.
2, The 2amp fuse doesn't blow when the 5U4 tube is removed and the AUX AMP cable is not connected.
3, The 2amp fuse blows when the 5U4 tube is removed but with the AUX AMP cable connected.
So the 2amp fuse blows with the 5U4 tube fitted with or without the AUX AMP cable connected. The fuse doesn't blow when the tube and cable are removed. The fuse blows when the 5U4 tube is removed but with the AUX AMP cable connected. I hope this makes sence to you becasue I'm starting to confuse myself.
Now I'm not sure if it is the transformer or not with this AUX AMP cable coming into play. What does the AUX AMP cable do?
Thanks, John
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Post by jukenorman on Feb 3, 2021 15:02:45 GMT
Trace the cable from the aux amp socket and see where it goes. Normally for a stand alone jukebox running with its internal loudspeakers, there would be nothing connected there.
Norman.
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Post by Ron Rich on Feb 3, 2021 18:37:28 GMT
Hi John,
If the fuse bows when the tube is fitted, but does NOT blow with it removed, and the jukebox operates normally (except no sound), you have an internal amplifier problem-- do not insert any more fuses into it-- get it repaired !
The AUX cables probably go from nowhere to east, nowhere-- as Norman said--trace them-- Ron Rich
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