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MX-6500N MX-7500N (serv.man19)
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98
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Service Manual
Brand
Device
Copying Equipment / Section 5 Adjustments and Settings
File
mx-6500n-mx-7500n-sm19.pdf
Date
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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 7
 
2-B
Adjust the developing bias voltage
This adjustment must be performed in the following cases:
* When the MC high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Enter the SIM 8-1 mode.
2)
Select an output mode to be adjusted with the mode key and the scroll key.
3)
Enter the adjustment value (specified value) of the middle speed mode and press [OK] key.
Remark: 
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the MC high voltage power PWB. Enter that value.
DVK:XXX DVC:XXX  DVM:XXX  DVY:XXX
When [EXECUTE] key is pressed, the voltage entered in the proce-
dure 3) is outputted for 30 sec and the set value is saved.
When [EXECUTE] key is pressed again, the output is stopped.
CAUTION: Note that the adjustment value may differ depending on
the MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order
to check the adjustment value.
This is a troublesome procedure. Therefore, it is advis-
able to put down the adjustment value in advance.
 
When the adjustment value (specified value) of the mid-
dle speed mode is set, the adjustment values of the
other modes are automatically set according to the mid-
dle speed mode setting in a certain relationship.
CAUTION: Since the high voltage output cannot be checked with a
digital multi meter in this model, a judgment of the out-
put must be made by checking the print image quality.
EXECUTE
EXECUTE 
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Item/Display (mode)
Content
Setting 
range
Default 
value
Actual voltage
65cpm 
machine
75cpm 
machine
MIDDLE
A
MIDDLE SPEED DVB_K
K developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
B
MIDDLE SPEED DVB_C
C developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
C
MIDDLE SPEED DVB_M
M developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
D
MIDDLE SPEED DVB_Y
Y developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
LOW
A
LOW1 SPEED DVB_K
K developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
B
LOW1 SPEED DVB_C
C developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
C
LOW1 SPEED DVB_M
M developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
D
LOW1 SPEED DVB_Y
Y developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
E
LOW2 SPEED DVB_K
K developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
F
LOW2 SPEED DVB_C
C developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
G
LOW2 SPEED DVB_M
M developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
H
LOW2 SPEED DVB_Y
Y developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 8
 
2-C
Transfer current/voltage adjustment
This adjustment must be performed in the following cases:
* When the primary transfer high voltage power PWB or Second-
ary transfer high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Enter the SIM 8-6 mode.
2)
Select a mode to be adjusted with the scroll key.
3)
Enter an adjustment value (specified value) and press [OK] key. 
By setting the default value (specified value), the specified voltage is outputted.
When [EXECUTE] key is pressed, the transfer voltage is outputted.
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EXECUTE
EXECUTE 
or after 30 sec.
10-key
Item/Display
Content
Setting 
range
Default value
65cpm 
machine
75 cpm 
machine
A
TC1 LOW 1 SPEED CL K
Primary 
transfer bias 
reference value
Color
K
Low speed 1 
51 - 255
91
91
B
TC1 LOW 2 SPEED CL K
Low speed 2
51 - 255
95
95
C
TC1 MIDDLE SPEED CL K
Middle speed 
51 - 255
99
99
D
TC1 LOW 1 SPEED CL C
C
Low speed 1 
51 - 255
91
91
E
TC1 LOW 2 SPEED CL C
Low speed 2
51 - 255
95
95
F
TC1 MIDDLE SPEED CL C
Middle speed 
51 - 255
99
99
G
TC1 LOW 1 SPEED CL M
M
Low speed 1 
51 - 255
91
91
H
TC1 LOW 2 SPEED CL M
Low speed 2
51 - 255
95
95
I
TC1 MIDDLE SPEED CL M
Middle speed 
51 - 255
99
99
J
TC1 LOW 1 SPEED CL Y
Y
Low speed 1 
51 - 255
91
91
K
TC1 LOW 2 SPEED CL Y
Low speed 2
51 - 255
95
95
L
TC1 MIDDLE SPEED CL Y
Middle speed 
51 - 255
99
99
M
TC1 LOW 1 SPEED BW K
Black and 
white
K
Low speed 1 
51 - 255
91
91
N
TC1 LOW 2 SPEED BW K
Low speed 2
51 - 255
95
95
O
TC1 MIDDLE SPEED BW K
Middle speed 
51 - 255
99
99
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 9
P
TC2 PLAIN CL SPX
Secondary 
transfer bias 
reference value
Color
Standard 
paper
Front surface
51 - 255
145
145
Q
TC2 PLAIN CL DPX
Back surface
51 - 255
145
145
R
TC2 PLAIN BW SPX
Black and 
white
Front surface
51 - 255
138
138
S
TC2 PLAIN BW DPX
Back surface
51 - 255
138
138
T
TC2 HEAVY1 CL SPX
Color
Heavy paper 1
Front surface
51 - 255
110
110
U
TC2 HEAVY1 CL DPX
Back surface
51 - 255
103
103
V
TC2 HEAVY1 BW SPX
Black and 
white
Front surface
51 - 255
110
110
W
TC2 HEAVY1 BW DPX
Back surface
51 - 255
103
103
X
TC2 HEAVY2 CL SPX
Color
Heavy paper 2
Front surface
51 - 255
96
96
Y
TC2 HEAVY2 CL DPX 
Back surface
51 - 255
87
87
Z
TC2 HEAVY2 BW SPX
Black and 
white
Front surface
51 - 255
96
96
AA
TC2 HEAVY2 BW DPX 
Back surface
51 - 255
87
87
AB
TC2 OHP CL
OHP
Color
51 - 255
110
110
AC
TC2 OHP BW
Black and 
white
51 - 255
110
110
AD
TC2 ENVELOPE CL
Envelope
Color
51 - 255
83
83
AE
TC2 ENVELOPE BW
Black and 
white
51 - 255
83
83
AF
TC2 THIN CL
Thin paper
Color
51 - 255
138
138
AG
TC2 THIN BW
Black and 
white
51 - 255
138
138
AH
TC2 GLOSSY CL
Glossy paper
Color
51 - 255
110
110
AI
TC2 GLOSSY BW
Black and 
white
51 - 255
110
110
AJ
TC2 EMBOSS CL
Embossed paper
Color
51 - 255
96
96
AK
TC2 EMBOSS BW
Black and 
white
51 - 255
80
80
AL
TC2 CLEAN LOW 1 SPEED
Bias reference 
value between 
papers
In low speed 1 print
51 - 255
76
76
AM
TC2 CLEAN LOW 2 SPEED
In low speed 2 print
51 - 255
76
76
AN
TC2 CLEAN MIDDLE SPEED
In middle speed print
51 - 255
76
76
AO
TC2 COUNTER
Counter bias 
reference value
Counter bias (positive pole)
26 - 255
109
109
AP
PTC LOW 1 SPEED CL
PTC current 
reference value
Color
Low speed 1 
51 - 255
119
119
AQ
PTC LOW 2 SPEED CL
Low speed 2
51 - 255
119
119
AR
PTC MIDDLE SPEED CL
Middle speed 
51 - 255
119
119
AS
PTC LOW 1 SPEED BW
Black and white
Low speed 1 
51 - 255
119
119
AT
PTC LOW 2 SPEED BW
Low speed 2
51 - 255
119
119
AU
PTC MIDDLE SPEED BW
Middle speed 
51 - 255
119
119
AV
PTC EMBOSS
Both
Low speed 2
51 - 255
119
119
AW
CASE VOLT LOW 1 CL
PTC case 
voltage 
reference value
Color
Low speed 1 
0 - 255
0
0
AX
CASE VOLT LOW 2 CL
Low speed 2
0 - 255
0
0
AY
CASE VOLT MIDDLE CL
Middle speed 
0 - 255
0
0
AZ
CASE VOLT LOW 1 BW
Black and white
Low speed 1 
0 - 255
0
0
BA
CASE VOLT LOW 2 BW
Low speed 2
0 - 255
0
0
BB
CASE VOLT MIDDLE BW
Middle speed 
0 - 255
0
0
BC
CASE VOLT EMBOSS
Both
Low speed 2
0 - 255
0
0
BD
TC2 DRIVEROLL LOW 1 SPEED CL
Secondary 
transfer drive 
roller bias 
reference value
Color
Low speed 1 
51 - 255
196
196
BE
TC2 DRIVEROLL LOW 2 SPEED CL
Low speed 2
51 - 255
196
196
BF
TC2 DRIVEROLL MIDDLE SPEED CL
Middle speed 
51 - 255
196
196
BG
TC2 DRIVEROLL LOW 1 SPEED BW
Black and white
Low speed 1 
51 - 255
196
196
BH
TC2 DRIVEROLL LOW 2 SPEED BW
Low speed 2
51 - 255
196
196
BI
TC2 DRIVEROLL MIDDLE SPEED BW
Middle speed 
51 - 255
196
196
BJ
TC2 CLEAN BRUSH(+) LOW 1 SPEED
Secondary 
transfer 
cleaning brush 
bias reference 
value
(+)
Low speed 1 
51 - 255
0
0
BK
TC2 CLEAN BRUSH(+) LOW 2 SPEED
Low speed 2
51 - 255
0
0
BL
TC2 CLEAN BRUSH(+) MIDDLE SPEED
Middle speed 
51 - 255
0
0
BM
TC2 CLEAN BRUSH(-) LOW 1 SPEED
(-)
Low speed 1 
51 - 255
0
0
BN
TC2 CLEAN BRUSH(-) LOW 2 SPEED
Low speed 2
51 - 255
0
0
BO
TC2 CLEAN BRUSH(-) MIDDLE SPEED
Middle speed 
51 - 255
0
0
Item/Display
Content
Setting 
range
Default value
65cpm 
machine
75 cpm 
machine
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 10
 
ADJ 3
Print/scan image automatic 
magnification ratio adjustment, 
Print/scan image automatic 
position adjustment 
(Automatic adjustment)
The following adjustment items can be executed automatically with
SIM50-28. (All paper feed trays including the option desk/LCC)
* ADJ  15
Print image position, image magnification ratio, void area, off-
center adjustment (Print engine) (Manual adjustment)
* ADJ  16
Scan image magnification ratio adjustment (Manual adjustment)
* ADJ  17
Scan image off-center adjustment (Manual adjustment)
* ADJ  18
Copy image position and image loss adjustment 
(Manual adjustment)
Menu in SIM50-28 mode
 
3-A
Print image automatic magnification ratio 
adjustment (Main scanning direction) 
(Print engine)
1)
Enter the SIM50-28 mode.
2)
Select [BK-MAG ADJ] with the key.
3)
Select the paper feed tray with paper in it with the key. 
(Any paper size will do.)
4)
Press [EXECUTE] key.
The adjustment pattern is printed out.
5)
Set the adjustment pattern on the document table.
CAUTION: Fit the adjustment pattern correctly with the document
guide.
In this case, put 5 sheets of white paper on the printed
adjustment pattern.
6)
Press [EXECUTE] key.
The following item is automatically adjustment.
* Print image main scanning direction image magnification
ratio.
7)
Press [OK] key.
The adjustment result becomes valid.
Display/Item
Content
OC ADJ
Image loss off-center sub scanning direction image 
magnification ratio adjustment (Document table mode)
BK-MAG ADJ
Main scanning direction image magnification ratio 
adjustment
SPF ADJ
Image loss off-center sub scanning direction image 
magnification ratio adjustment (DSPF mode)
SETUP/
PRINT ADJ
Print lead edge adjustment, image off-center (each paper 
feed tray, duplex mode) adjustment
RESULT
Adjustment result display
DATA
Display of data used when an adjustment is executed
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