MX-1800N (serv.man31). Details of each Section - K Developing Section - Sharp Copying Equipment Service Manual (repair manual). Page 2

MX-1800N  DEVELOPING SECTION  K – 2

Electrostatic latent images generated on the OPC drum by the
laser (writing) units (laser image ray) are converted into visible
images by toner.

Toner and carrier in the developing unit are agitated and trans-
ported by the mixing roller.
By mixing and transporting, toner and carrier are negatively
charged due to mechanical friction.
The developing bias voltage (AC component and negative DC
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.
If the OPC drum is not exposed, the negative potential is higher
than the developing bias voltage, and toner is not attracted.

1)

Open the front cabinet.

2)

Remove the waste toner bottle unit. 

DVM_CL

Developer motor (color)

Color developing unit drive

DVM_K

Developer motor (black)

Black developing unit drive

BS

Developer bias (Y, M, C, K)

Developer bias

TCS

Toner density sensor (Y, M, C, K)

Controls the toner density in the developing unit. 

DVTYP

DV initial detection PWB (Y, M, C, K)

Detection of a new developing unit (machine exclusive for CRU)

1

Developer roller

Latent electrostatic images on the OPC drum are changed to visible images.

2

Stirring roller

Stirring developer

3

Toner filter

Prevents dispersing of toner.

(1)

Developing 
unit

a

Developer

b

DV seal

c

DV side seal F

d

DV side seal R

e

DV initial PWB

f

Density sensor

g

Toner filter

(1)-a

(1)-c

(1)-g

(1)

(1)-b

(1)-e

(1)-f

(1)-d