Sharp MX-6500N / MX-7500N (serv.man27) Service Manual ▷ View online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 33
9. Developing section
A. Electrical and mechanical relation diagram
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 34
B. Operational descriptions
This converts the electrostatic latent images on the OPC drum gen-
erated by the laser (writing) unit into visible images with toner.
erated by the laser (writing) unit into visible images with toner.
Toner and carrier in the developing unit are stirred and transported
by the mixing roller.
by the mixing roller.
By mixing and transporting, toner and carrier are negatively
charged due to mechanical friction.
charged due to mechanical friction.
The developing bias voltage (AC component and negative DC
component) is applied to the developing roller.
component) is applied to the developing roller.
Negatively charged toner is attracted to the exposed section on the
OPC drum where the negative potential falls due to the developing
bias.
OPC drum where the negative potential falls due to the developing
bias.
If the OPC drum is not exposed, the negative potential is higher
than the developing bias voltage, and toner is not attracted.
than the developing bias voltage, and toner is not attracted.
(1)
Preliminary mixing system
The preliminary mixing section is extended for rapid mixing of sup-
ply toner with developer and stable toner density.
ply toner with developer and stable toner density.
(2)
Developer refresh system
Developer deterioration suppression technology for the purpose of
charging stability and long-life of developer.
charging stability and long-life of developer.
Waste developer is discharged from the developer exit port little by
little as shown in the figure below to maintain developer fresh.
little as shown in the figure below to maintain developer fresh.
Signal name
Name
Function/Operation
DM_KCMY
Drum motor
Drives the developer and the drum.
DVC_KCMY
Development drive clutch
Clutch for development drive
GB-KCMY
Developing bias
Bias for development
TCS_KCMY
Toner density sensor
Controls the toner density in the developing unit.
No.
Name
Function/Operation
1
Developer roller
Latent electrostatic images on the OPC drum are changed to visible images.
2
Mixing roller
Mixing of developer
3
Toner filter
Prevents dispersing of toner
Preliminary mixing section
Developer exit port
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 35
10. Transfer section
A. Electrical and mechanical relation diagram
(1)
Transfer section
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 36
(2)
Transfer section 2
Signal name
Name
Function/Operation
1TC-CMY
Primary transfer output (CMY)
Color transfer high voltage
1TC-K
Primary transfer output (K)
B/W transfer high voltage
1TUD_CL
Transfer mode detector (CL)
Color transfer roller position detection
1TUD_K
Transfer mode detector (BK)
B/W transfer roller position detection (1TUD_BK)
1TURC
Primary transfer separation clutch
Controls the primary transfer separation mode.
1TURRC
Primary transfer separation reverse clutch
Controls the primary transfer separation mode.
2CL
Secondary transfer brush roller output
Cleans the secondary transfer section.
2DR
Secondary transfer drive roller output
Reduces toner splash in separation.
2TBMD_F/R
Secondary transfer belt skew detection
sensor
sensor
Detect the skew of secondary transfer belt
2TBMD_HP
Secondary transfer belt skew correction
motor home position sensor
motor home position sensor
Detect the skew correction motor home position
2TC
Secondary belt transfer output
Secondary transfer high voltage
2TUM
Secondary transfer belt skew correction
motor
motor
Correct the skew of secondary transfer belt
BTM
Transfer belt motor
Drives the transfer belt.
PTC
PTC output
PTC high voltage
PTCCHPD
PTC cleaner home position sensor
Detects the PTC cleaner home position. (PTCHP)
PTCCM
PTC cleaning motor
Drives the PTC cleaner.
WTM
Waste toner drive motor
Transports waste toner.
No.
Name
Function/Operation
1
Primary transfer cleaner blade
Clean and remove residual toner from the primary transfer belt.
2
Primary transfer belt
Toner on the drum is transferred to form toner images on the belt.
3
Primary transfer roller
Transfers toner images on the OPC drum to the primary transfer belt.
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