P-9: Ng (Bk Developing Unit Failure 1; P-10: Unused - Minolta CF910 Service Manual

(9) P-9: NG (Bk Developing Unit Failure 1)

Step
1 Is the value for "Dev. Bk" of "Bk Toner
Sup. Status" near 30,000? Or, is the η
value low with an image that is rough to
the touch?
2 Is the AIDC Sensor dirty or the adjustment
value out of the specified range?
3 Does the malfunction code appear after
the developer has been changed?
(Is the Life Counter reset after unit-to-unit
variations of the Bk Developing Unit have
been corrected following change of the
developer?)
Do the η and Bk Constant values change
4
little (i.e., are they stable?) as checked
with "Bk Toner Sup. Status" each time a
copy is made?
5 Is toner in the Toner Hopper caked?
6 Open "Developer Filling" from "Developer
Change Mode" and run a black toner sup-
ply sequence. Does the Toner Replenish-
ing Motor turn at this time?
<Note>
Note that the Toner Replenishing Motor
does not turn if the "Bk Constant" values
of "Bk Toner Sup. Status" change on the
high side of the standard.

(10) P-10: Unused

Check Item
T-101
Result
YES Change the developer.
YES Clean the AIDC Sensor, then
adjust it.
YES If ten or more copies have been
made, change the developer
again and clear the Life
Counter before making a cor-
rection of unit-to-unit variations
of the Bk Developing Unit.
NO Turn OFF and ON the Power
Switch, make ten copies, turn
OFF and ON the Power Switch
again, and perform "Gradation
Adjust." Repeat these steps
about ten times.
YES A. Agitate toner in the Toner
Hopper with a screwdriver.
B. Tell the user to shake the
bottle well when adding
toner.
NO A. Check the Metering Roller
and gears for rotation and, if
any unusual symptoms are
noted, disassemble and
clean, or change, the Toner
Hopper.
B. Clean the contact between
the Toner Hopper and
copier drawer connector.
C. Check the wiring between
PWB-I and M9.
D. Check the motor drive for
possible overload and, if it
is free of overload, change
M9.
E. If these have been checked
okay, change PWB-I.
Action