Rough Image (Uneven Particle Size - Minolta CF910 Service Manual

(16) Rough Image (Uneven Particle Size)

<Troubleshooting Procedure>
Cause Step
Defective 1
Developing
Unit
2
3
4
5
6
7
8
9
10
11
Check Item
Is the Developer Life Counter
around 30K?
Is the inside of the Developing
Unit plugged with foreign mat-
ter or toner?
Is the gap between the Doctor
Blade and Sleeve Roller 0.7
mm?
Are the Ds rolls dirty or
scratched?
Do the Sleeve/Magnet Roller
and Developer Supply Roller
turn properly?
Is the Developing Unit set
properly?
Open the "ATDC Sensor"
screen in the "Developer"
menu and check if 5% is dis-
played for "ATDC Sensor".
Is the ATDC Sensor window
contaminated?
Is the connector on HV4 con-
nected properly?
Does each color Toner Replen-
ishing Motor turn?
Is the Toner Replenishing
Shutter clogged with foreign
matter?
T-80
1144T025AA
Result
YES Replace the developer.
YES Remove the foreign matter.
If the problem recurs,
change the developer.
("Developer" and "Grada-
tion Adjust")
NO Referring to
DIS/REASSEMBLY,
ADJUSTMENT, readjust
the gap.
YES Clean or change the defec-
tive roll.
NO Check the wiring between
PWB-I and M19, and if it is
intact, change M19.
NO Reset the Developing Unit.
NO Readjust by referring to
DIS/REASSEMBLY and
ADJUSTMENT.
YES Clean the window.
NO Reconnect the connector.
NO A. Check the wiring
between PWB-I and
Motor.
B. Check the motor drive
for possible overload,
and if it is free of over-
load, change M15.
YES Remove the foreign matter.
Action