Brother LX-300 Service Manual page 120

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Cartridge Type Detector Circuit
This circuit detects the type of film cartridge.
The Cartridge type detector switch CSIZE3 is mounted at the film cartridge inlet.
When an A3 film cartridge is inserted, the A3 film cartridge presses the Cartridge
type detector switch CSIZE3 and turns it ON (P14 becomes LOW).
The Cartridge type detector switch CSIZE4 is mounted at the film cartridge inlet.
When an A4 film cartridge is inserted, the A4 film cartridge presses the Cartridge
type detector switch CSIZE4 and turns it ON (P20 becomes LOW).
The Cartridge type detector switches remain OFF when an A6 film cartridge is
inserted and when no film cartridge is inserted.
Fig. 5.4-6
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Film Type Detector circuit (ENC sensor PCB)
This circuit detects the type of film.
This circuit comprises a reflective photosensor that is mounted on the film detector
PCB, located on the side of the film cartridge holder. The reflective photosensor
reads the silver-black target pattern along the side of the film to determine the film
type.
Cartridge Type Detector Circuit Film Type Detector Circuit
Fig. 5.4-7 Film Type Detector Circuit
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