Sony UP-D2500 Service Manual page 61

3) Head position sensor
Route : SE-420 to SE-417 to PRT-11
TP : PRT-11 board TP110(HED_POS 0),TP113(HED_POS 1)
Function _ : Distinction of thermal head position
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4) Ribbon cassette sensor
Route : Microswitch to SE-417 to PRT-11
TP : PRT-11 board TP108
Function _ : Distinction whether the ribbon cassette is inserted into the unit or not.
Level :H The ribbon cassette is not inserted.
:L_ The ribbon cassette is inserted.
UP-D2500(UC,CE) 4-11