Kyocera TASKalfa 2551ci, Service Manual, Page: 503 / 756

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13. Registration sensor (RS)....................... Controls the secondary paper feed start timing.
14. Duplex sensor (DUS) ............................ Detects a paper jam in the duplex section.
15. Eject sensor (ES) .................................. Detects a paper misfeed in the fuser or eject section.
16. Job paper full sensor (JPFS) ................ Detects the paper full in the job separator tray.
17. Paper full sensor (PFS)......................... Detects the paper full in the inner tray.
18. Waste toner sensor (WTS).................... Detects when the waste toner box is full.
19. Paper sensor 1 (PS1) ........................... Detects the presence of paper in the cassette 1.
20. Paper sensor 2 (PS2) ........................... Detects the presence of paper in the cassette 1.
21. Paper sensor 3 (PS3) ........................... Detects the presence of paper in the cassette 2.
22. Paper sensor 4 (PS4) ........................... Detects the presence of paper in the cassette 2.
23. Lift sensor 1 (LS1)................................. Detects activation of upper limit of the bottom plate in the cassette
1.
24. Lift sensor 2 (LS2)................................. Detects activation of upper limit of the bottom plate in the cassette
2.
25. Paper size width switch 1 (PWSW1)..... Detects the width of paper in the cassette 1.
26. Paper size width switch 2 (PWSW2)..... Detects the width of paper in the cassette 2.
27. Paper size length switch 1 (PLSW1) .... Detects the length of paper in the cassette 1.
28. Paper size length switch 2 (PLSW2) .... Detects the length of paper in the cassette 2.
29. ID shutter sensor (IDSS)....................... Detects the position of the iD shutter.
30. ID sensor 1 (IDS1) ................................ Measurement of density of toner at calibration.
31. ID sensor 2 (IDS2) ................................ Measurement of density of toner at calibration.
32. Main power switch (MSW) .................... Turns ON/OFF the AC power source.
33. Bridge detection switch (BRDSW) ........ Detects the presence of the bridge.
34. Job eject papersensor (JEPS) .............. Detects the presence of paper in the job separator.
35. Temperature sensor (TEMS)................. Detects temperature and absolute humidity in machine.
36. Toner sensor Y (TS-Y) .......................... Detects the amount of toner remainder in the developing unit Y.
37. Toner sensor C (TS-C).......................... Detects the amount of toner remainder in the developing unit C.
38. Toner sensor M (TS-M) ......................... Detects the amount of toner remainder in the developing unit M.
39. Toner sensor K (TS-K) .......................... Detects the amount of toner remainder in the developing unit K.
40. Fuser thermistor 1 (FTH1) .................... Detects the heat roller temperature.(edge)
41. Fuser thermistor 2 (FTH2) .................... Detects the heat roller temperature.(center)
42. Fuser thermistor 3 (FTH3) .................... Detects the press roller temperature.
43. TC belt sensor 1 (TCBS1)..................... Detects the position of the primary transfer belt.
44. TC belt sensor 2 (TCBS2)..................... Detects the position of the primary transfer belt.
45. Fuser pre sensor (FUPS)...................... Detects the JAM on this side of fuser.
46. Fuser roller rotation detection sensor
(FRS) .................................................... Detects the rotation of the fuser roller.
47. Paper feeder detection switch
(PFDSW)............................................... Detects the presence of the paper feeder.
48. Front cover switch 2 (FCSW2).............. Detects the opening and closing of the front cover.