Harmon Kardon 4551-8792 loudness control board for model HK6100 is in good working condition. If for any reason you are not satisfied with or product or item...PLEASE CONTACT US WE WILL MAKE IT RIGHT...thanks for looking . ALL AREA 52 7/1/22 PLEASE READ WARRANTY/RETURN POLICY All of our parts are tested with a live unit 100 % guaranteed in working condition . We are unable to issue credit or refund for any parts that were not shipped from our store and parts that are damaged or tampered with or have missing components from the PC board. We use an identifying stamp on all parts that we ship. All of our boards are removed from broken panels. Please do not buy this part just to try it out its important to carefully determine the part you need before ordering.