Read Sharp MX-B381 / MX-B401 (serv.man5) Service Manual online
MX-B381/B401 EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 5
6. Sensors and detectors
Signal name
Name
Type
Function/Operation
Note
1TUD_CL
Transfer belt separation detector CL
Transmission type
Detects separation of the transfer belt.
High voltage PWB
holder unit
holder unit
1TUD_K
Transfer belt separation detector BK
Transmission type
Detects initialization of the primary transfer unit.
Frame unit
APPD1
ADU transport path detector 1
Transmission type
Detects paper pass in the upper stream of the
switchback section.
switchback section.
Right door unit
APPD2
ADU transport path detector 2
Transmission type
Detects paper pass in the middle stream of the
switchback section.
switchback section.
Right door unit
CLUD1
Tray 1 upper limit detector
Transmission type
Detects that the top surface of the paper stored in the
tray 1 is lifted to the top.
tray 1 is lifted to the top.
Paper feed unit
CPED1
Tray 1 paper empty detector
Transmission type
Detects that paper is stored in the tray 1.
Paper feed unit
CPFD1
Paper transport detector 1
Reflection type
Detects paper when passes the transport roller 1.
Paper feed unit
CSPD1
Tray 1 paper remaining quantity
detector
detector
Transmission type
Detects the paper remaining quantity in the tray 1.
Lift-up unit
HLPCD
Fusing roller pressure release detector
Transmission type
Detects separation of the upper and the lower heat
rollers.
rollers.
Fusing unit
MHPS
Scanner home position detector
Transmission type
Detects the scanner home position.
Scanner unit
MPED
Manual feed paper empty detector
Transmission type
Detects paper empty in the manual paper feed tray.
Manual paper feed unit
MPLD1
Manual feed paper length detector 1
Transmission type
Detects the length of paper in the manual paper feed
tray.
tray.
Manual paper feed unit
MPWS
Manual paper feed tray paper width
sensor
sensor
Volume resistor
Detects the width of the paper guide in the manual
paper feed tray.
paper feed tray.
Manual paper feed unit
POD1
Fusing rear detector
Transmission type
Detects paper exit from the fusing section.
Frame fusing unit
POD2
Paper exit detector
Transmission type
Detects paper which is discharged.
Paper exit lower PG unit
PPD1
Paper transport detector 2
Transmission type
Detects paper when passes the transport roller 2.
Paper feed unit
PPD2
Paper transport detector 3
Reflection type
Detects paper in front of the registration roller.
Frame unit
REGS_R
Registration sensor
Reflection type
Detects the toner patch density. Detects open/close of
the reference reflection plate, the secondary transfer
roller transfer position, and the non-transfer position.
the reference reflection plate, the secondary transfer
roller transfer position, and the non-transfer position.
Registration unit
RTH_EX1
External heat roller contact thermistor 1
Thermistor
Detects the temperature of the external heat roller.
Fusing unit
RTH_EX2
External heat roller contact thermistor 2
Thermistor
RTH_Low
Lower heat roller contact thermistor
Thermistor
Detects the temperature of the lower heat roller.
Fusing unit
RTH_Main
Upper heat roller non-contact
thermistor
thermistor
Non-contact
thermistor
thermistor
Detects the temperature of the upper heat roller.
Fusing unit
RTH_Sub
Upper heat roller contact thermistor
Thermistor
SOCD
SCOV
SPED
MHPS
TFD2
TCS_K
PPD2
APPD2
CPED1
CSPD1
CLUD1
MPED
MPLD1
MPWS
TH/HUD
CPFD1
PPD1
POD2
POD1
APPD1
HLPCD
RTH_EX1
RTH_EX2
RTH_Sub
RTH_Low
RTH_Main
1TUD_K
1TUD_CL
REGS_R
SPPD1
SPPD2
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