Harmon Kardon HKTS200 Subwoofer quit working why?

SOURCE: How do I disassemble + clean Harmon Kardon SoundStick subwoofer?

Check for a Fuse. Mine is an older model and has a Fuse right next to the power cord. It probably has a slot for a flathead screwdriver.

SOURCE: I have Harmon Kardon AVR 25 ii receivers and I

To locate the problem...a) Cable
Test if right cable is ok, by interchanging the rt/left cables.

b) Test Bose right speaker
Connect the Bose right speaker to HK's left channel. Works? Then Bose right speaker is ok.

c) Test HK's right output by connecting the left Bose speaker to HK's right output.
Does not work?

SOURCE: need to replace ac cord on subwoofer

bring your ac cord to electronic or computer part sales so that you can buy same specifications

SOURCE: My receiver doesn't have a dedicated subwoofer

That would depend mostly on your subwoofer. There are some that slave off the front left and right speaker outputs and still pass the amp's power to the Front Speakers. That would be the only way that would ensure volume control.

Otherwise you have to feed a self-powered sub from the Tape Outs but that won't allow volume control from the H-K.

SOURCE: how do i connect my boston acoustics pv800

You need to use the LINE LEVEL connection on the pv800 (usually a rca type connector cable) and run this cable into the back of the HK 520 Subwoofer PRE-OUT connector, be sure the HK Receiver menu speaker set-up option is set to SUBWOOFER "YES"