Velodyne ct-100 subwoofer, 6years old. Electic power is there. No blown up fuze. The woofer is working when removed and connect to a separate speaker. How to check the circuit board or transformer ? How to diagonistic and solve the problem ?
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The amp has a fuse mounted on the PC board. The fuse may be blown.
The speaker may be bad. that may have blown the fuse.
You can test the speaker with a "D" battery.
Take the amp section out of the back, disconnect the speaker leads.
Touch the speaker leads to the poles of the battery. it should make a little thump and the cone should move freely.