Becker Mexico CC4325 Operating Manual page 24

A temperature protection circuit is utilised in this unit in order to protect the
laser diode against over heating.
When this protection circuit is activated, appears for 8 seconds.
The unit switches back to the last selected signal source (FM / AM / LW or CD/
MD changer).
The single CD operation can be requested again after a short cooling phase.
However, if the temperature is still too high, the unit again switches back to the
previously selected signal source.
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