Sharp Mx 2300n Service Manual

MX-2300/2700 N/G  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 14
N. Fuses/Thermostats
34 SCAN IN PWB Rectifies the waveform of scanner image data. 
DOCC PWB Recognizes the document control pattern. Option
35 BOOT ROM PWB Stores the program to boot the printer controller.
36 PROGRAM ROM PWB Stores the program.
37 SCN Flash ROM PWB Stores the scanner control program.
38 HVR PWB Divides the primary transfer electrode for each color to improve the transfer capability.
No. Signal name Name Specifications...

MX-2300/2700 N/G  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 15
O. Adjustment volumes
P. G a t e
Signal name Function/ Operation Section Note
VR201 +12V output adjustment DC power PWB
VR203 +24V output adjustment DC power PWB
VR204 +5VN output adjustment DC power PWB
VR205 +3.3V output adjustment DC power PWB
VR402 +5VO, +5VL output adjustment DC power PWB
No. Name Function/ Operation Note
1 ADU reverse gate Switches the paper route: discharged to the inner tray or 
discharged to the right tray.
2 ADU...

MX-2300/2700 N/G  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 16
Q. Rollers
No. Name Function/ Operation Note
1 Paper feed roller (Manual paper feed tray) Feeds paper to the paper transport section. 
2 Separation roller (Manual paper feed tray) Separate paper to prevent against double feed. 
3 Paper pickup roller (Manual paper feed tray) Feeds paper to the paper feed roller. 
4 Paper feed roller (No. 1 paper feed tray) Feeds paper to the paper transport section. 
5 Paper pickup roller (No. 1 paper feed...

MX-2300/2700 N/G  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 17
21 Transport roller 7 (Drive) Transports paper from the paper feed tray 1, 2, 3, and 4 to the 
transport roller 8. 
22 Transport roller 8 (Idle) Applies a pressure to paper and the transport roller to give paper the 
transport power of the transport roller.
23 Transport roller 8 (Drive) Transports paper to the resist roller. 
24 Transport roller 9 (Idle) Applies a pressure to paper and the transport roller to give paper the 
transport power...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 1 MX2700N
Service Manual [6] ADJUSTMENTS
1. General
Each adjustment item in the adjustment item list is associated with
a specific Job number. Perform the adjustment procedures in the
sequence of Job numbers from the smallest to the greatest.
However, there is no need to perform all the adjustment items. Per-
form only the necessary adjustments according to the need.Unnecessary adjustments can be omitted. Even in this case, how-
ever, the sequence from the smallest to...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 2
3. Details of adjustment
 
1Developing doctor gap adjustment
This adjustment must be executed in the following cases:
* When the developing unit is disassembled. 
* When the print image density is low.
* When there is a blur on the print image. 
* When there is unevenness in the print image density.
* There is abnormally much toner dispersion.
1) Remove the developing unit from the main unit, and remove
the developing unit upper cover and the developing doctor...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 3
4) Push the developing doctor in the arrow direction, and tighten
the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)
5) Check that the doctor gaps at two positions in 40mm – 70mm
from the both sides of the developing doctor are in the range of
0.40 ± 0.05mm.
* When inserting a thickness gauge, be careful not to scratch the
developing doctor and the developing roller.
 
2Developing roller main pole...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 4 1) With the front cabinet open, enter SIM25-2.
2) Close the front cabinet.
3) Select a developing unit to be adjusted.
4) When [EXECUTE] key it pressed, it is highlighted. The devel-
oping roller rotates, and the toner sensor detects toner density,
and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 5 Remark: By setting the default value, the specified voltage is 
normally outputted.
The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.
GBK:XXX GBC:XXX GBM:XXX GBY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust...

MX-2300/2700 N/G  ADJUSTMENTS  6 – 6 1) Enter SIM8-1 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: By setting the default value, the specified voltage is 
normally outputted.
The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.
DVK:XXX DVC:XXX DVM:XXX DVY:XXX
When the adjustment value...