Type Hk3450

If you are getting an error message on your Harman Kardon HK3450 receiver after 15 seconds of turning it on, and all the voltages are okay, there are a few things you can test:

Check the speaker connections: Make sure that all of the speaker connections are secure and that there are no loose wires.

Try a different speaker: If you have another speaker, try connecting it to the receiver to see if the error message persists. If the error message does not occur with the other speaker, then the problem is likely with the original speaker.

Check the source components: Disconnect all of the source components from the receiver, such as your TV, Blu-ray player, and game console. Then, turn on the receiver without any source components connected. If the error message does not occur, then the problem is likely with one of the source components.

Reset the receiver: To reset the receiver, press and hold the power button for 10 seconds. Then, release the power button and wait for the receiver to turn off completely. Once the receiver is off, turn it back on and see if the error message persists.

Update the firmware: If you have not updated the receiver's firmware in a while, check to see if there is a new firmware update available. You can download the latest firmware update from the Harman Kardon website.

If you have tried all of the above and the error message persists, then you may need to take the receiver to a qualified service technician for repair.

Here are some additional tips for troubleshooting problems with your Harman Kardon HK3450 receiver:

Make sure that the receiver is properly ventilated. If the receiver is overheating, it may go into error mode.

Avoid using the receiver in humid environments.

Do not overload the receiver. If you are connecting multiple speakers to the receiver, make sure that the total impedance of the speakers is within the receiver's operating range.

If you are having problems with the remote control, try replacing the batteries.

If you are still having problems, consult the receiver's owner's manual for further troubleshooting assistance.