MX-6240N, MX-7040N (serv.man24). Section 5 Adjustments and Settings - Updated November 2012 - Sharp Copying Equipment Service Manual (repair manual). Page 6

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MX-7040N  ADJUSTMENTS AND SETTINGS  5 – 6
 
ADJ 2
High voltage adjustment
 
2-A
Adjust the main charger grid 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 8-2 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.
GBK:XXX GBC:XXX  GBM:XXX  GBY:XXX
The default values specified for each model must be changed as
follows:
62cpm machine: + 0
70cpm machine: + 5
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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or after 30 sec.
10-key
Item/Display (mode)
Content
Setting 
range
Default 
value
Actual voltage
62cpm 
machine
70cpm 
machine
MIDDLE
A
MIDDLE SPEED GB_K
K charging/grid bias set value at middle speed
150 - 850
635
–635V 
 5V
–640V 
 5V
B
MIDDLE SPEED GB_C
C charging/grid bias set value at middle speed
150 - 850
635
–635V 
 5V
–640V 
 5V
C
MIDDLE SPEED GB_M
M charging/grid bias set value at middle speed
150 - 850
635
–635V 
 5V
–640V 
 5V
D
MIDDLE SPEED GB_Y
Y charging/grid bias set value at middle speed
150 - 850
635
–635V 
 5V
–640V 
 5V
LOW
A
LOW1 SPEED GB_K
K charging/grid bias set value at low speed 1
150 - 850
625
–625V 
 5V
–625V 
 5V
B
LOW1 SPEED GB_C
C charging/grid bias set value at low speed 1
150 - 850
625
–625V 
 5V
–625V 
 5V
C
LOW1 SPEED GB_M
M charging/grid bias set value at low speed 1
150 - 850
625
–625V 
 5V
–625V 
 5V
D
LOW1 SPEED GB_Y
Y charging/grid bias set value at low speed 1
150 - 850
625
–625V 
 5V
–625V 
 5V
E
LOW2 SPEED GB_K
K charging/grid bias set value at low speed 2
150 - 850
620
–620V 
 5V
–620V 
 5V
F
LOW2 SPEED GB_C
C charging/grid bias set value at low speed 2
150 - 850
620
–620V 
 5V
–620V 
 5V
G
LOW2 SPEED GB_M
M charging/grid bias set value at low speed 2
150 - 850
620
–620V 
 5V
–620V 
 5V
H
LOW2 SPEED GB_Y
Y charging/grid bias set value at low speed 2
150 - 850
602
–620V 
 5V
–620V 
 5V
Display
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