ONKYO AV Center SA-205HD Sound Muddiness/Sound Dropout Troubleshooting - 2509

The Onkyo SA-205HD, a small and lightweight AV center, has relays in series for each of the three speaker (SP) circuits: "Front L/R," "Center," and "Surround L/R." Over time, contact failure in these relays can cause muffled sound, making normal listening difficult. Therefore, I have devised an "electrical countermeasure" that bypasses the relay contact points using LED indicators and toggle switches.

Before listing, I have confirmed that the following inputs and outputs are functioning correctly: "Line1-3," "Optical-1, -2," "HDMI1-1, -2," and the speaker outputs (Front L/R, Center, Surround L/R, Subwoofer), as well as the "TV" output. I have also confirmed the fan is operating.

1. Instructions for Use
* Three LEDs and switches corresponding to the three relays are located on the right side of the unit (see photo). When the product is shipped, the switch levers are in the down position, and the "electrical countermeasure" is not activated.
* When the unit is powered on, the LED corresponding to the listening mode will light up.
* To activate the "electrical countermeasure" and restore normal sound, move the switch lever below the lit LED from the down position to the up position.
* You do not need to touch the three switches during normal listening.

2. The items included are the "SA-205HD" unit (with scratches and dirt on the top cover, see photos) and the self-made document "(Outline of Measures Against Muffled Sound/Sound Dropout)." Please prepare the "Remote Control (RC-678S)" and "Instruction Manual" separately.

3. Other Information
* Returns will be handled according to the Mercari Guide "Product Return Procedure." My approach is as follows:
* "Please initiate the product return process after we have reached an agreement (the seal on the top cover of the product must not be removed, and you must contact us regarding the return via email or phone within 7 days of receiving the product)." Please note that the buyer is responsible for the return shipping costs. (The return address is listed in the "self-made document.") I will confirm that the product seal is intact and then apply for cancellation on Mercari. The product price will be refunded to the buyer according to their payment method after the transaction is canceled.