More than likely your RCA's need to be replaced. There is no need to open it up, as the ground wire rarely every comes loose. It's held down by a screw & soldered to the circuit board. Unless you pulled on the ground wire.
There are only 3 issues which can cause this:
1)
Technics Tonearm - Check the 4 prongs inside the tonearm. Make sure they are all clean (shiny gold), and all protruding the same distance. There are springs behind these prongs, and often times they do come loose over time or overtightening.
2)
Technics RCA Cables - This is more than likely the culprit.
3) Cartridge/Headshell - swap out with your good unit. If it works, then your good. Just replace cartridge
With the exception of #3, the other 2 will require assistance from a qualified service technician, otherwise you could cause more damage to your turntables.
- OPTiC
Master Tech, 1200s.com
Technics Parts :
Technics Repairs
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