Sharp MX-6500N / MX-7500N (serv.man11) Service Manual ▷ View online
MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 19
12. Heater
*: Option
Signal name
Name
Function/Operation
WH_CS3 *
Paper dehumidifying heater
(Paper feed tray 4)
(Paper feed tray 4)
Dehumidifies the paper feed tray section to prevent paper from absorbing humidity which causes
degraded image quality and paper jams.
degraded image quality and paper jams.
WH_LSU
LSU heat-retention heater
Dehumidifies the LSU section to prevent it from dew condensation.
WH_S1
Scanner heat-retention heater
Dehumidifies the scanner section to prevent it from dew condensation.
WH_TND *
Paper dehumidifying heater
(Paper feed tray 1, 2)
(Paper feed tray 1, 2)
Dehumidifies the paper feed tray section to prevent paper from absorbing humidity which causes
degraded image quality and paper jams.
degraded image quality and paper jams.
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MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 20
13. Fans
Signal name
Name
Function/Operation
ADUFM_F
ADU cooling fan (F)
Cools the ADU paper transport section.
ADUFM_R
ADU cooling fan (R)
Cools the ADU paper transport section.
CLFM
Scanner cooling fan
Cools the scanner section.
FPRFM_F
Fusing cooling fan (F)
Cools the fusing section and the paper exit section.
FPRFM_R
Fusing cooling fan (R)
Cools the fusing section and the paper exit section.
FUFM
Fusing cooling fan
Cools the fusing section.
HDDFM
HDD cooling fan
Cools the HDD.
LSUFM
LSU cooling fan
Cools the LSU.
MFPFM
MFP cooling fan
Cools the surrounding of the MFP PWB.
OZFM1
Ozone fan motor 1
Discharges ozone generated in the process section.
OZFM2
Ozone fan motor 2
Discharges ozone generated in the process section.
OZFM3
Ozone fan motor 3
Discharges ozone generated in the process section.
POFM_EX
Paper exit cooling fan
Cools the fusing section and the paper exit section.
POFM_F
Paper exit cooling fan (F)
Cools the fusing section and the paper exit section.
POFM_R
Paper exit cooling fan (R)
Cools the fusing section and the paper exit section.
PSFM1
Power cooling fan 1
Cools the power unit.
PSFM2
Power cooling fan 2
Cools the power unit.
SPSFAN
Sub DC power cooling fan
Cools the sub DC power.
TBFM
Toner bottle cooling fan motor
Toner cooling fan motor
VFM_R
Machine ventilation fan
Ventilates air in the machine. (EFM2)
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MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 21
14. Filter
No.
Name
Function/Operation
1
Toner filter
Prevents toner from splashing from the DV unit.
2
Ozone filter
Absorbs ozone generated in the image process section.
3
Toner filter
Absorbs floating toner in the image process section.
4
Deodorant filter
Absorbs odor generated in the fusing section.
MX-7500N EXTERNAL VIEW AND INTERNAL STRUCTURE 4 – 22
15. PWB/Memory device
No.
Name
Function/Operation
1
TP-IF PWB PWB
Controls the touch panel.
2
LVDS PWB
Converts the display data signal to the LCD display signal.
3
Document size detection PWB (Light receiving)
Outputs the document size detection signal.
4
CCD PWB
Scans document images and performs A/D conversion of the scanning signal.
5
Scanner lamp drive PWB
Drives the scanner lamp.
6
Document size detection PWB (Light emitting)
Drives the LED for the document size detection.
7
HL control PWB
Drives the heater lamp.
8
SCN Mother PWB
Process image data, controls the overall scanner, and controls the operation section. Interfaces
the MFP PWB and the operation PWB, the PCU PWB, the LSU PWB, and the FAX unit.
the MFP PWB and the operation PWB, the PCU PWB, the LSU PWB, and the FAX unit.
9
TC1 PWB (High voltage TC1 PWB)
Generates the primary transfer voltage.
10
MC PWB (High voltage MC PWB)
Generates the main charger voltage and the DV bias voltage.
11
Paper feed tray detection PWB (Paper feed tray 1)
Opens/closes the paper feed tray and detects paper.
12
SUB AC POWER PWB
Controls the power of the heater lamp drive circuit. AC cord 2 power monitor signal (FW signal
output). (Only in the 2-power plug system models)
output). (Only in the 2-power plug system models)
13
SUB DC POWER PWB
Generates the power for the SPF and options.
14
Dehumidifier heater PWB
Controls the dehumidifier heater.
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