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MX-6500N MX-7500N (serv.man27)
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53
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Service Manual
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Device
Copying Equipment / Section 13 Operational Descriptions
File
mx-6500n-mx-7500n-sm27.pdf
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MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 21
(4)
PS lower unit
Signal name
Name
Function/Operation
LCCM
LCC transport motor
Drives the LCC transport section and the PS lower section.
 No.
Name
Function/Operation
 1
Transport roller 13 (Drive)
Transports paper to the transport roller 17.
LCCM
1
DRIVER PWB 
XHP-6
B6B-P
ASK-1
P
AP-06V
-S
CN-8
1
3
5
6
4
2
+24V
+24V
LCCM_/A
LCCM_/B
LCCM_B
LCCM_A
+24V
+
24
V
B6B-XH-A
LCCM_A
LCCM_/A
LCCM_B
LCCM_/B
5
6
4
3
2
1
CN-8
502790-6491
POM_XA
POM_A
POM_B
POM_CNT
POM_XB
ADUM1_XA
ADUM1_XB
ADUM1_A
ADUM1_B
ADUM2_A
ADUM2_B
ADUM1_CNT
ADUM2_XA
ADUM2_XB
ADUM2_CNT
PFM_CLK
PFM_CNT
PFM_EN
WEBM2_A
WEBM2_B
WEBM1_A
WEBM1_B
PRM_XB
RRM_CLK
RRM_EN
RRM_CNT1
RRM_CNT2
502790-6491
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LCCM_A
LCCM_B
LCCM_XA
LCCM_XB
LCCM_CNT
FUMCM_A
FUMCM_B
FUMCM_XA
FUMCM_XB
PRM_A
PRM_B
PRM_XA
GND
TNHM_A
TNHM_B
TNHM_/A
TNHM_/B
TNHM_Y_EN
TNHM_M_EN
TNHM_C_EN
TNHM_K_EN
TNM_K_A
TNM_K_B
TNM_K_/A
TNM_K_/B
TNM_C_A
TNM_C_B
TNM_C_/A
TNM_C_/B
TNM_M_A
TNM_M_B
TNM_M_/A
TNM_M_/B
TNM_Y_A
TNM_Y_B
TNM_Y_/A
TNM_Y_/B
CN-10
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
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10
9
8
7
2
3
4
5
6
1
60
59
58
57
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55
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53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
61
62
63
64
POM_XA
POM_A
POM_B
POM_CNT
POM_XB
ADUM1_XA
ADUM1_XB
ADUM1_A
ADUM1_B
ADUM2_A
ADUM2_B
ADUM1_CNT
ADUM2_XA
ADUM2_XB
ADUM2_CNT
PFM_CLK
PFM_CNT
PFM_EN
WEBM2_A
WEBM2_B
WEBM1_A
WEBM1_B
PRM_XB
RRM_CLK
RRM_EN
RRM_CNT1
RRM_CNT2
LCCM_A
LCCM_B
LCCM_XA
LCCM_XB
LCCM_CNT
GND
FUMCM_A
FU
MCM_B
FUMCM_XA
FUMCM_XB
PRM_A
PRM_B
PRM_XA
TNHM_A
TNHM_B
TNHM_/A
TNHM_/B
TNHM_Y_EN
TNHM_M_EN
TNHM_C_EN
TNHM_K_EN
TNM_K_A
TNM_K_B
TNM_K_/A
TNM_K_/B
TNM_C_A
TNM_C_B
TNM_C_/A
TNM_C_/B
TNM_M_A
TNM_M_B
TNM_M_/A
TNM_M_/B
TNM_Y_A
TNM_Y_B
TNM_Y_/A
TNM_Y_/B
PCU PWB
MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 22
(5)
PS unit
Signal name
Name
Function/Operation
PFM
Transport motor
Drives the registration roller. 
PPD1
Registration pre-pre-detection
Detects the paper in front of transport roller 17.
PPD2
Registration pre-detection
Detects the paper in front of registration roller.
RRM
Registration motor
Drives the registration roller and controls ON/OFF timing.
 No.
Name
Function/Operation
 1
Transport roller 17 (Drive)
Transports paper from transport roller 13 to registration roller.
 2
Registration roller (Drive)
Transports paper to the transfer section. Controls the tr0ansport timing of paper, and adjusts the relative 
relations between images and paper.
 3
Registration roller (Idle)
Apply a pressure to paper and the registration roller to provide the transport power of the transport roller to 
paper.
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MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 23
(6)
PS unit 2
B. Operational description
(1)
PS section
Transport paper from each paper feed section to the registration
roller with two or more transport rollers. The paper transport clutch
controls ON/OFF of each transport roller. The registration roller
controls the relative positions of the transported paper and transfer
images.
The registration roller controls the relative positions of the trans-
ported paper and transfer images. The registration roller is driven
by the transport motor. The relative positions of the paper and the
transfer images are determined by the ON timing of the transport
motor. 
(2)
PED cis sensor
a. Operation of Image position sensor
It detects the position of the paper transferred by the contact image
sensor (CIS) and automatically adjusts the off center.
CIS: Contact Image Sensor
It is a contact image sensor integrated with the light source, the
lens (Selfoc ) and the sensor.
Signal name
Name
Function/Operation
PED cis
PED cis sensor
Detects the position of the transferred paper. 
PDFS-R
Double feed detection sensor-R
Detects double or multi fed paper.
PDFS-T
Double feed detection sensor-T
Detects double or multi fed paper.
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03
MX-7500N  OPERATIONAL DESCRIPTIONS  13 – 24
(3)
DFS sensor
a. Outline of Operation
The double-feed sensor is incorporated in the paper transport sec-
tion of 120/105cpm machines, and it detects double feed.
Paper transport stops when double feed is detected.
Ultrasonic generator generates ultrasound during paper transport.
The level of reception of the ultrasonic sensor largely changes
(decreases) when double feed occurs. Double sheet feed is
detected in this method.
Block diagram
b.
Mechanism and operation of double-feed detection
The sensor is composed of ultrasonic generator part and ultrasonic
detector part.  Double feed is detected using 220kHz ultrasound.
Operation when sheets of paper are normally fed one by one
Some of the ultrasound is reflected by the paper, but the ultrasound
reaches the sensor more than the specified level.
The sensor analog output level at that time is 300mV or more, and
digital output level is "L."
Operation when double feed occurs
Most of ultrasound is reflected when double feed occurs, because
the stiffness of paper is high.  As a result, the ultrasound which
reaches the sensor is weak, and less than the specified level.
At that time, the sensor analog output level is 300mV or less, the
digital output level is "H."
 
Paper
(1 sheet)
(Double feed)
Ultrasound
Ultrasonic 
generator
Secondary 
radiation
Reflect
Ultrasonic 
sensor
Ultrasonic sensor
(DFS PWB)
Ultrasound
generate
Digital signal
output
PCU
PWB
 
Ultrasonic 
generator
Amplifier
Detection 
circuit
Page of 53
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