remote control issue

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I need some help trying to fix my problem.
I'm using a CD player with a remote.

When I want to increase the preamp output level with another remote,
the CD's display panel stops updating data and the CD's remote don't act
any more.
However the CD keeps working fine.
Who is the culprit ?
The microcontroller MAB8461P, the light detecting unit SHARP GP1U521X ?
 

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