For all kind of brands cd or dvd players There is in every cd or dvd tray in the front bottom or under the tray so crazy you can not think an microswitch necessary that will be by mechanic close of the tray detect if the tray is closed and give a timed signal (close or open) to focus laser for reading of table of contents if the belt is bad it can take to long by a slipping tray drivebelt for the detection , or the microswitch or brass plate contacts are have a little corrosion on it or even it can be broken by a missing timing.
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For all kind of brands cd or dvd players There is in every cd or dvd tray in the front bottom or under the tray so crazy you can not think an microswitch necessary that will be by mechanic close of the tray detect if the tray is closed and give a timed signal (close or open) to focus laser for reading of table of contents if the belt is bad it can take to long by a slipping tray drivebelt for the detection , or the microswitch or brass plate contacts are have a little corrosion on it or even it can be broken by a missing timing.