Read Sharp MX-M950 / MX-MM1100 (serv.man24) Service Manual online
MX-M1100 TRANSFER SECTION L – 2
2. Operational descriptions
A. Pre-transfer discharge operation
Light is radiated onto the OPC drum after development to reduce
negative charges on the OPC drum. In the areas where toner is
attached to, an electric attraction force between the OPC drum and
toner is weakened to improve the efficiency in transfer operations.
In the areas where toner is not attached to, an electric attraction
force between paper and the OPC drum after transfer is weakened
to improve the separation performance.
negative charges on the OPC drum. In the areas where toner is
attached to, an electric attraction force between the OPC drum and
toner is weakened to improve the efficiency in transfer operations.
In the areas where toner is not attached to, an electric attraction
force between paper and the OPC drum after transfer is weakened
to improve the separation performance.
B. Transfer operation
A positive high voltage is applied to the transfer roller to charge
paper on the transfer belt positively, transferring negatively
charged toner images onto paper.
paper on the transfer belt positively, transferring negatively
charged toner images onto paper.
(Transfer current)
The transfer current control signal (XTHV+PWM) duty is changed
to control the output current.
The transfer current ON / OFF is controlled by the signal (XTHV +
REM).
In addition, the other transfer current control signal XTHV-PWM
and the transfer current ON/OFF control signal (XTHV-REM) are
outputted simultaneously.
to control the output current.
The transfer current ON / OFF is controlled by the signal (XTHV +
REM).
In addition, the other transfer current control signal XTHV-PWM
and the transfer current ON/OFF control signal (XTHV-REM) are
outputted simultaneously.
C. Transfer belt cleaning operation
In the transfer belt cleaning operation, a negative high voltage
including the AC component is applied to the transfer roller to
attach unnecessary residual toner from the transfer belt to the OPC
drum, cleaning the transfer belt.
including the AC component is applied to the transfer roller to
attach unnecessary residual toner from the transfer belt to the OPC
drum, cleaning the transfer belt.
The transfer belt cleaning control signal (XTHV-PWM) duty is
changed to control the output voltage.
The transfer belt cleaning ON/OFF is controlled by the signal
(XTHV-REM).
On the other hand, the AC component controls the output voltage
by changing the duty of XTHVACPWM. The AC component ON/
OFF is controlled by the signal (XTHVACREM).
The transfer belt cleaning is executed mainly by the transfer blade
belt cleaning belt.
Unnecessary residual toner on the transfer belt is removed and
transported to the waste toner collection section by the waste toner
transport screw.
changed to control the output voltage.
The transfer belt cleaning ON/OFF is controlled by the signal
(XTHV-REM).
On the other hand, the AC component controls the output voltage
by changing the duty of XTHVACPWM. The AC component ON/
OFF is controlled by the signal (XTHVACREM).
The transfer belt cleaning is executed mainly by the transfer blade
belt cleaning belt.
Unnecessary residual toner on the transfer belt is removed and
transported to the waste toner collection section by the waste toner
transport screw.
In addition, the cleaning brush is provided in the transfer section,
where the transfer belt is cleaned, too.
In the transfer belt cleaning, the cleaning roller (brush type)
removes unnecessary residual toner from the transfer belt, and a
positive voltage (+200V) is applied to the removed toner to attach
them to the cleaning roller.
where the transfer belt is cleaned, too.
In the transfer belt cleaning, the cleaning roller (brush type)
removes unnecessary residual toner from the transfer belt, and a
positive voltage (+200V) is applied to the removed toner to attach
them to the cleaning roller.
Model
Operation mode
Output current
85 -sheet model
Front print
30uA
Back print
35uA
95 -sheet model
Front print / Back print
40uA
110 -sheet model
Front print / Back print
40uA
PTDL1
PTDL1
OPC drum
CTL
CGL
Aluminum
layer
layer
Cleaning
mode
mode
Transfer
mode
mode
OPC drum
CTL
CGL
Aluminum
layer
-400v/-600v
AC4.5kv
(p-p)
(p-p)
30-40
μA
Cleaning
mode
mode
Transfer
mode
mode
OPC drum
CTL
CGL
Aluminum
layer
-400v/-600v
AC4.5kv
(p-p)
(p-p)
30-40
μA
Cleaning
mode for
transfer belt
mode for
transfer belt
Cleaning
mode for
cleaning roller
mode for
cleaning roller
-500v
+200v
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