P-17: Ng (S/P Communications Error; P-18: Ng (Pc Drum Charge Corona Wire Cleaning Malfunction; P-19: Ng (Abnormally Low Bk Developing Efficiency - Minolta CF910 Service Manual

(17) P-17: NG (S/P Communications Error)

Step
1 Are print jacks on PWB-K (PJ10K) and
PWB-I (PJ3I) plugged in correctly?

(18) P-18: NG (PC Drum Charge Corona Wire Cleaning Malfunction)

Step
Does the cleaning element move
smoothly when the gear is turned with PC
Drum Charge Wire Cleaning Motor M3
removed?

(19) P-19: NG (Abnormally Low Bk Developing Efficiency)

Step
1 Does "Bk Constant" show 2% or less
when "Bk Toner Sup. Status" is opened
from "State Confirm" available from the
Service mode menu?
2 Open "Developer Filling" from "Developer Change Mode" and select Black.
Note: Remove the exterior cover from the Hopper before executing the toner sup-
ply.
3 Is the Toner Hopper energized during the
toner supply?
Check Item
Check Item
Check Item
T-103
Result
NO Reconnect the print jacks.
Result
YES Check the wiring between
PWB-L and M3 and, if it is
intact, change M3 and PWB-L,
in that order.
NO Check gears and other mecha-
nisms for overload.
Result
NO Change the Developing Unit.
("Developer Change Mode,"
"Gradation Adjust")
YES Change the Developing Unit.
("Developer Change Mode,"
"Gradation Adjust")
If the malfunction code persists,
change PWB-I.
NO A. Check the wiring between
PWB-I and Toner Replen-
ishing Motor (Bk) M9.
B. Check the motor drive for
possible overload and, if it
is free of overload, change
M9.
C. If A. and B. have been
checked okay, change
PWB-I. (Change the Toner
Hopper as may be neces-
sary.)
Action
Action
Action