Sharp MX-6500N / MX-7500N (serv.man18) Service Manual ▷ View online
MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 9
6. Sensors and detectors
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MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 10
Signal name
Name
Type
Function/Operation
1TUD_CL
Transfer mode detector (CL)
Light transmission
Detects separation of the transfer belt and the transfer mode.
(Detection is made by combination of 1TUD_CL/1TUD_K signals.)
(Detection is made by combination of 1TUD_CL/1TUD_K signals.)
1TUD_K
Transfer mode detector (BK)
Light transmission
Detects separation of the transfer belt and the transfer mode.
(1TUD_BK)
(Detection is made by combination of 1TUD_CL/1TUD_K signals.)
(1TUD_BK)
(Detection is made by combination of 1TUD_CL/1TUD_K signals.)
2TBMD_F
2nd transfer belt skew detector F
Detects the edge of 2nd transfer belt F.
2TBMD_HP
2nd transfer belt skew correction motor
home position sensor.
home position sensor.
Detects paper pass in the transport roller 21.
2TBMD_R
2nd transfer belt skew detector R
Detects the edge of 2nd transfer belt R.
APPD1
ADU paper pass detector 1
Light transmission
Detects paper entry in the ADU section.
APPD2
ADU paper pass detector 2
Light transmission
Detects paper pass in the transport roller 21.
BD
Laser beam sensor
Pin diode
Detects laser beams.
C3LUD
Paper upper limit detector
(Paper feed tray 3)
(Paper feed tray 3)
Light transmission
Detects the upper limit lift position of paper in the paper feed tray.
C3PED
Paper empty detector (Paper feed tray 3)
Light transmission
Detects paper.
C3PFD
Paper pass sensor (Paper feed tray 3)
Light reflection
Detects paper pass in the paper transport section of the paper feed tray
3.
3.
C3SPD
Paper remaining quantity detector
(Paper feed tray 3)
(Paper feed tray 3)
Light transmission
Detects the paper remaining quantity.
C3SS1 - 4
Paper size detector (Paper feed tray 4)
Tact switch
Detects the paper size. Detects open/close of the paper feed tray.
C4LUD
Paper upper limit detector
(Paper feed tray 4)
(Paper feed tray 4)
Light transmission
Detects the upper limit lift position of paper in the paper feed tray.
C4PED
Paper empty detector (Paper feed tray 4)
Light transmission
Detects paper.
C4PFD
Paper pass sensor (Paper feed tray 4)
Light reflection
Detects paper pass in the paper transport section of the paper feed tray
4.
4.
C4PWD
Paper width sensor (Paper feed tray 4)
Resistance volume
Detects the paper width.
C4SPD
Paper remaining quantity detector
(Paper feed tray 4)
(Paper feed tray 4)
Light transmission
Detects the paper remaining quantity.
C4SS1 - 4
Paper feed tray size detector
(Paper feed tray 4)
(Paper feed tray 4)
Tact switch
Detects the paper size. Detects open/close of the paper feed tray.
CCHPD_C
MC cleaner HP sensor (C)
Light transmission
Detects the MC cleaner home position. (CCHP_C)
CCHPD_K
MC cleaner HP sensor (K)
Light transmission
Detects the MC cleaner home position. (CCHP_K)
CCHPD_M
MC cleaner HP sensor (M)
Light transmission
Detects the MC cleaner home position. (CCHP_M)
CCHPD_Y
MC cleaner HP sensor (Y)
Light transmission
Detects the MC cleaner home position. (CCHP_Y)
CCMD_C
MC cleaner shift sensor (C)
Light transmission
Detects the shift distance of the MC cleaner.
CCMD_K
MC cleaner shift sensor (K)
Light transmission
Detects the shift distance of the MC cleaner.
CCMD_M
MC cleaner shift sensor (M)
Light transmission
Detects the shift distance of the MC cleaner.
CCMD_Y
MC cleaner shift sensor (Y)
Light transmission
Detects the shift distance of the MC cleaner.
CIS
Image position sensor
Contact image sensor
Detects the paper edge position in the off-center direction in the PS
section.
section.
DEDC_L
DRUM encoder sensor (C_L)
Light transmission
Detects the drum rotation speed.
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MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 11
DEDC_R
DRUM encoder sensor (C_R)
Light transmission
Detects the drum rotation speed.
DEDK_L
DRUM encoder sensor (K_L)
Light transmission
Detects the drum rotation speed.
DEDK_R
DRUM encoder sensor (K_R)
Light transmission
Detects the drum rotation speed.
DEDM_L
DRUM encoder sensor (M_L)
Light transmission
Detects the drum rotation speed.
DEDM_R
DRUM encoder sensor (M_R)
Light transmission
Detects the drum rotation speed.
DEDY_L
DRUM encoder sensor (Y_L)
Light transmission
Detects the drum rotation speed.
DEDY_R
DRUM encoder sensor (Y_R)
Light transmission
Detects the drum rotation speed.
DHPD_C
Drum phase sensor (C)
Light transmission
Detects rotation and the phase of the OPC drum (C).
DHPD_K
Drum phase sensor (K)
Light transmission
Detects rotation and the phase of the OPC drum (K).
DHPD_M
Drum phase sensor (M)
Light transmission
Detects rotation and the phase of the OPC drum (M).
DHPD_Y
Drum phase sensor (Y)
Light transmission
Detects rotation and the phase of the OPC drum (Y).
DSW_ADU
ADU open/close detector
Light transmission
Detects open/close of the ADU section.
DSW_CS
Transport cover open/close detector
Light transmission
Detects open/close of the transport cover.
DSW_FU
Front door upper open/close detector
Light transmission
Detects open/close of the front door upper.
DSW_RL
Right lower door open/close detector
Light transmission
Detects open/close of the right lower door.
FPFD
Fusing front paper pass detector
Light reflection
Detects paper pass in front of the fusing section.
HLPCD
Fusing pressure detector
Light transmission
Detects the fusing pressure state.
HUD_M/TH_M
Temperature/humidity sensor
Temperature/humidity
sensor
sensor
Detects the temperature and the humidity. (For the process control)
LPPD
LCC transport detector
Light reflection
Detects paper transport from the LCC.
MHPS
Scanner home position sensor
Light transmission
Detects the scanner home position.
MPED
Paper empty detector
(Manual paper feed tray)
(Manual paper feed tray)
Light transmission
Detects paper.
MPFD
Paper feed detector (Manual paper feed)
Light transmission
Detects paper pass in the manual paper feed section.
MPLD1
Paper length detector
(Manual paper feed tray)
(Manual paper feed tray)
Light transmission
Detects the paper length.
MPWD
Paper width sensor
(Manual paper feed tray)
(Manual paper feed tray)
Resistance volume
Detects the paper width.
OCSW
Document size detection trigger sensor
Light transmission
Generates the document size detection trigger signal.
PDFS-R
Double feed sensor (receiving)
Supersonic sensor
Detects paper double feed.
PDFS-T
Double feed sensor (transmitting)
Supersonic sensor
Detects paper double feed.
POD1
Fusing paper exit detector
Light transmission
Detects paper pass in the fusing section.
POD2
Left paper exit detector
Light transmission
Detects paper exit to the left direction.
POD3
Right paper exit detector
Light transmission
Detects paper exit to the left direction.
PPD1
Registration pre-detection
Light reflection
Detects the paper timing before registration.
PPD2
Registration sensor
Light reflection
Detects the paper registration timing.
PRTPD
Paper exit tray paper detector
(Right paper exit tray)
(Right paper exit tray)
Light transmission
Detects paper in the paper exit tray.
PTCCHPD
PTC cleaner home position sensor
Light transmission
Detects the PTC cleaner home position. (PTCHP)
REGS_C/
PCS_C
PCS_C
Image registration/Density sensor (C)
Light reflection
Detects image color shift. Detects the toner patch density.
REGS_F/
PCS_F
PCS_F
Image registration/Density sensor (F)
Light reflection
Detects image color shift. Detects the toner patch density.
REGS_R/
PCS R
PCS R
Image registration/Density sensor (R)
Light reflection
Detects image color shift. Detects the toner patch density.
T1LUD
Paper upper limit detector (Paper feed
tray 1)
tray 1)
Light transmission
Detects the upper limit lift position of paper in the paper feed tray.
T1PED
Paper empty detector (Paper feed tray 1)
Light transmission
Detects paper.
T1PPD1
Paper pass sensor (Paper feed tray 1)
Light reflection
Detects paper pass in the paper transport section of the paper feed tray
1.
1.
T1PPD2
Paper pass sensor (Paper feed tray 1)
Light reflection
Detects paper pass in the paper transport section of the paper feed tray
1.
1.
T1SPD
Paper remaining quantity detector
(Paper feed tray 1)
(Paper feed tray 1)
Light transmission
Detects the paper remaining quantity.
T2LUD
Paper upper limit detector (Paper feed
tray 2)
tray 2)
Light transmission
Detects the upper limit lift position of paper in the paper feed tray.
T2PED
Paper empty detector (Paper feed tray 2)
Light transmission
Detects paper.
T2PPD1
Paper pass sensor (Paper feed tray 2)
Light reflection
Detects paper pass in the paper transport section of the paper feed tray
2.
2.
T2SPD
Paper remaining quantity detector
(Paper feed tray 2)
(Paper feed tray 2)
Light transmission
Detects the paper remaining quantity.
TCS_C
Toner density sensor (C)
Magnetic sensor
Detects toner supply from the toner cartridge. Detects the toner density
(C).
(C).
TCS_K
Toner density sensor (K)
Magnetic sensor
Detects toner supply from the toner cartridge. Detects the toner density
(K).
(K).
TCS_M
Toner density sensor (M)
Magnetic sensor
Detects toner supply from the toner cartridge. Detects the toner density
(M).
(M).
TCS_Y
Toner density sensor (Y)
Magnetic sensor
Detects toner supply from the toner cartridge. Detects the toner density
(Y).
(Y).
TFD2
Paper exit full detector (Center paper exit
tray)
tray)
Light transmission
Detects paper full in the center paper exit tray.
TFD3
Paper exit full detector (Right paper exit
tray)
tray)
Light transmission
Detects paper full in the right paper exit tray.
Signal name
Name
Type
Function/Operation
MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 12
TFSD_C
Toner remaining quantity sensor (C)
Piezoelectric sensor
Detects the remaining quantity of toner in the toner hopper.
TFSD_K
Toner remaining quantity sensor (K)
Piezoelectric sensor
Detects the remaining quantity of toner in the toner hopper.
TFSD_M
Toner remaining quantity sensor (M)
Piezoelectric sensor
Detects the remaining quantity of toner in the toner hopper.
TFSD_Y
Toner remaining quantity sensor (Y)
Piezoelectric sensor
Detects the remaining quantity of toner in the toner hopper.
TH_LM1
Fusing temperature sensor 1
(Fusing roller B)
(Fusing roller B)
Non-contact thermistor
Detects the center surface temperature of the fusing roller B.
TH_LM2
Fusing temperature sensor 2
(Fusing roller B)
(Fusing roller B)
Contact-type thermistor
Detects the edge surface temperature of the fusing roller B.
TH_PS
Transfer temperature thermistor
Thermistor
Detects the around temperature of the 1st transfer drive roller.(Used for
correction of color registration)
correction of color registration)
TH_UM
Main fusing temperature sensor
(Fusing belt)
(Fusing belt)
Non-contact thermistor
Detects the center surface temperature of the fusing belt.
TH_US1
Sub fusing temperature sensor
(Fusing belt)
(Fusing belt)
Non-contact thermistor
Detects the edge surface temperature of the fusing belt.
TH_US2
Fusing temperature sensor (Fusing belt)
Contact-type thermistor
Detects the edge surface temperature of the fusing belt.
TH1_LSU
LSU thermistor 1
Thermistor
Detects the temperature in the LSU. (Used for correction of distortion.)
TNDSET
Open/close detector
(Paper feed tray 1, 2)
(Paper feed tray 1, 2)
Light transmission
Detects open/close of the paper feed trays 1 and 2.
WEBEND2
Web end detector 2
Light transmission
Detects web end.
WTBSET
Waste toner bottle detector
Light transmission
Detects installation of the waste toner bottle.
WTFD
Waste toner full detector
Light transmission
Detects full of waste toner.
Signal name
Name
Type
Function/Operation
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