-
what would be the best process for troubleshooting and fixing it?
Continuity check from the cartridge to the phono plugs that go into your amp would be the first step. The leads from the turntable chassis to the headshell in particular are quite delicate and can get broken in transit, or just from years of flexing to accommodate tracking the tone arm.
If the wiring checks out, the problem is in the cartridge. I'm assuming here that the phono stage of your amp worked with some other turntable.
I bought a second hand record player, however I'm not getting sound out of the left speaker channel. It's not the amp or the speaker - what would be the best process for troubleshooting and fixing it?