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Original thread:
Post 6 made on Saturday August 17, 2019 at 15:04
Ernie Gilman
Yes, That Ernie!
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December 2001
30,104
Tape that is black to our eyes may not be opaque to IR. Fun fact.

I wrote this up several years ago while doing something... hence a phrase or two that don't really pertain:

How to find the IR sensor

While we're looking at stuff, does the manual show the IR location?

Confirm at each step that you know what you think you know:

First, is the remote sending out IR?

Point a remote from another component, like a CD or DVD something simple... at your cell phone. If your cell phone can see IR, it will show white or slightly purplish lights blinking at the end of the remote.

Now that we know your phone can see IR, do the same thing with the remote for the unit for which you're trying to find the sensor. Do lights blink on that remote?

I find the sensor with the factory remote, not an IR emitter (i.e. not part of an IR system), to be sure that none of your IR system and its possible problems can confuse things. You can't be sure your entire IR system is working until you find the IR sensor, so you can't start by finding the IR sensor with the system. You have to use the factory remote.

Take a book with a dark non-reflective cover and place it in front of the left part of the AV receiver (TV, etc.). Try the remote from three or four feet back. See what happens.

What you are trying to do is be far enough back that the book is truly casting an effective IR "shadow" on the front of the unit. If the unit responds, move the book an inch at a time until you have pinned down just where, left to right, the remote starts controlling the unit. Conversely, where it stops controlling it. Mark that left-right spot. Do the same from the other side. Then hold the book and move it up and down as you retry controlling the component. This should pin down the height of the sensor.

Remember, be a few feet back. This helps ensure that IR doesn't bounce sideways off of cabinet sides or other things that it might.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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