Well if the removing the earphone plug and the unit no longer working aren't a co-incidence? Then perhaps the earphone socket has faulted and cut off the speakers, output. You see in an earphone socket there is an additional set of contacts, that makes & breaks the line to the speaker and routes it to the earphones, often these contacts will stay open, after the plug is withdrawn. and thus stop any output from going to the speakers. Or sometimes the solder join on the PCB can break and the effect is the same.
The only way to tell is to examine the unit and check this out. As mooted before though, i do wonder if this isn't a co-incidence, and the fault is to do with something else, often these units fail in the area of the output amplifier IC's. The unit really needs to be put through the troubleshooting procedures to exactly tell. If one was to attempt a DIY, then at the least one would need to obtain a service manual, for these steps and to obtain the parts numbers to buy any spare parts.
http://www.jukeboxparts.com/new_page_4.htm
Above is a place to assist you with a service manual, should you wish to DIY? However, Wurlitzer's are a complex device, and my professional recommendation is to get a "Quote" for any prospective repairs, from a Wurlitzer repairer.
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