MX-6500N, MX-7500N (serv.man28). Section 14 Electrical Section - Sharp Copying Equipment Service Manual (repair manual). Page 36

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MX-7500N  ELECTRICAL SECTION  14 – 36
DVTYPSEL_M
Development 
identification detection 
M (digital)
Development 
identification detection 
M (digital)
–
–
CN17
16
PCU PWB
DVTYPSEL_Y
Development 
identification detection Y 
(digital)
Development 
identification detection Y 
(digital)
–
–
CN17
23
PCU PWB
EFM1_CNT
Machine ventilation fan 
1 (center) PWM
Machine ventilation fan 
motor (center) PWM 
control
–
–
CN15
22
PCU PWB
EFM1_LD
Machine ventilation fan 
1 (center) lock detection
Machine ventilation fan 
1 (center) lock detection
Normal 
rotation 
state
CN15
26
PCU PWB
EFM1_V
Machine ventilation fan 
1 (center) ON/OFF
Machine ventilation fan 
motor (center) ON/OFF 
control
Fan motor 
ON
CN15
20
PCU PWB
EFM2_CNT
Machine ventilation fan 
2 (right) PWM
Machine ventilation fan 
motor 2 (right) PWM 
control
–
–
CN23
36
PCU PWB
EFM2_LD
Machine ventilation fan 
2 (right) lock detection
Machine ventilation fan 
motor 2 (right) lock 
detection
Normal 
rotation 
state
–
CN23
40
PCU PWB
EFM2_V
Machine ventilation fan 
2 (right) ON/OFF
Machine ventilation fan 
motor 2 (right) ON/OFF 
control
–
Fan  motor 
ON
CN23
34
PCU PWB
FAN_24V
LSU cooling fan 
(LSUFM) signal
Drives the cooling fan of 
the LSU unit. 
Stop
Drive
CN500
17
LSU-CNT
FAN_nREADY
LSU cooling fan 
(LSUFM) lock signal
Detects lock of the 
cooling fan of the LSU 
unit. 
–
Lock 
detection
CN500
18
LSU-CNT
FPFD
Fusing paper entry 
detection
Fusing paper entry 
detection
Paper 
presence
–
CN9
22
PCU PWB
FPRFM1_V
Fusing pressure roller 
cooling fan 1 ON/OFF
Fusing pressure roller 
cooling fan motor 1 ON/
OFF control
Fan motor 
ON
CN12
14
PCU PWB
FPRFM2_LD
Fusing pressure roller 
cooling fan 2 lock 
detection
Fusing pressure roller 
cooling fan motor 2 lock 
detection
Normal 
rotation 
state
–
CN12
25
PCU PWB
FPRFM2_V
Fusing pressure roller 
cooling fan 2 ON/OFF
Fusing pressure roller 
cooling fan motor 2 ON/
OFF control
–
Fan  motor 
ON
CN12
16
PCU PWB
FRM_OCACIS
CIS unit communication
CIS unit communication
–
–
CN14
3
PCU PWB
FRS
Fusing lower pawl 
separation solenoid
Fusing lower pawl 
separation solenoid 
control
Solenoid ON
–
CN9
32
PCU PWB
FUFM_CNT
Fusing fan cooling PWM
Fusing fan cooling 
motor PWM control
–
–
CN10
22
PCU PWB
FUFM_LD
Fusing fan cooling lock 
detection
Fusing fan cooling 
motor lock detection
Normal 
rotation 
state
–
CN10
24
PCU PWB
FUFM_V
Fusing fan cooling ON/
OFF
Fusing fan cooling 
motor ON/OFF control
–
Fan  motor 
ON
CN10
18
PCU PWB
FUM_CK
Fusing motor CLK
Fusing motor CLK 
signal
–
–
CN10
30
PCU PWB
FUM_D
Fusing motor ON/OFF
Fusing motor ON/OFF 
control
Motor ON
–
CN10
32
PCU PWB
FUM_GAIN
Fusing motor gain
Fusing motor gain 
setting
–
–
CN10
26
PCU PWB
FUM_LD
Fusing motor lock 
detection
Fusing motor lock 
detection
Motor 
normal 
rotation 
state
–
CN10
28
PCU PWB
FW
Zero cross input signal 1
Zero cross input signal 1
–
–
CN4
27
PCU PWB
FW2
Zero cross input signal 2
Zero cross input signal 2
–
–
CN4
32
PCU PWB
GUnD
PDFS unit setting
PDFS unit setting
–
–
CN14
13
PCU PWB
HL_LM
Heater lamp lower main
Heater lamp lower main 
control
–
Heater lamp 
ON
CN23
33
PCU PWB
HL_POW_CNT
Heater AC relay control
Heater AC relay control
–
Relay ON
CN4
24
PCU PWB
/HL_PR
Heater lamp power relay 
ON/OFF
Heater lamp power 
relay ON/OFF control
–
Relay ON
CN23
27
PCU PWB
HL_UM
Heater lamp upper main
Heater lamp upper main 
control
–
Heater lamp 
ON
CN23
29
PCU PWB
HL_US
Heater lamp upper sub
Heater lamp upper sub 
control
–
Heater lamp 
ON
CN23
31
PCU PWB
Signal name
Name [Type]
Function/Operation
Connector level
Connector 
No.
Pin 
No.
PWB name
NOTE
L
H
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