Troubleshoot Your Stereo With a Digital Camera
You're mashing buttons on your remote control, but the stereo ignores you. You replace the batteries. Still no action. So which is malfunctioning: the remote control or the stereo?
Believe it or not, your digital camera can tell you the answer. Most models can see well into the infrared spectrum, which is the region where your remote control operates. To troubleshoot, point your remote control into your camera lens and then push some buttons.
Now look at the camera's LCD screen (not at the optical viewfinder). If the remote works, you'll see a flashing light where the remote's infrared emitter is. --Dave Johnson
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