Help fixing a Wharfedale amplifier

[donny0m]

Bought this amp and speaker set at a garage sale, owner said speaker dont work. I've tried out the speakers and they are great. Turns out the active subwoofer does not output signal to the speakers. The sub woofer speaker itself is going though.

I opened up the back plate to see if there was a fuse out. Only found two 6.3A fuses both intact, makes sense now because the sub is firing. There isn't any apparent damage to the circuitry and cant figure out why the speaker outputs are busted.

Any ideas on how you'd go about troubleshooting this? I have a basic understanding of electronics and have tools/multi-meter/soldering iron, etc.

[g1]

Those speaker jacks are inputs, not outputs. Consult the owners manual.