Muratec MFX-2500 Field Engineering Manual page 252

(1) Blank Copy
Section Step
1 Is toner empty?
Is the drive transmission
2 mechanism to the Developing
Unit in good condition?
Is the image transfer current
3
Printer terminal intact?
engine
Does the laser shutter (the one
located on the laser beam path
4
between the PH Unit and PC
Drum) open and close properly?
Does the I/C Shutter open and
5
close properly?
Is the Scanner drive transmission
1
mechanism in good condition?
Do the connections from CCD Þ
Scanner
PCB AFE Þ PCB Scanner Þ
2
PCB Main Þ PCB Connect Þ
PWB-A remain intact?
(2) Black Copy
Section Step
Is the PC Drum charge voltage
1
terminal in good condition?
Is the grid voltage terminal in
2
good condition?
Printer
Is the developing bias terminal in
engine 3
good condition?
Does a black copy persist even
4 after the I/C has been replaced
with a new one?
Does the Exposure Lamp turn ON
1 when make a copy with open the
platen cover?
Does the voltage across P14 on
pin 2 and pin 3 change from
2
DC0V to DC24V when step 1 is
Scanner
performed again?
Does the voltage across P14 on
3 pin 1 and pin 3 change to DC0V
when step 1 is performed again?
Are the mirrors and lens installed
4
properly?
5 Are the mirrors and lens dirty?
Check Item
Check Item
4-38
Result Action
Check Sub Hopper Toner
YES Empty Switch S4 and change
the Toner Bottle.
Check and change as
NO
necessary.
Check and change as
NO
necessary.
Adjust so that the shutter opens
NO
and closes properly.
Change HV1, PH Unit, or PWB-
YES
A, in that order.
Adjust so that the shutter opens
NO
and closes properly.
Check and change as
NO
necessary.
Change PCB AFE, PCB
Scanner, PCB Main, PCB
YES
Connect or PWB-A, in that
order.
NO Reconnect.
Result Action
Check and change as
NO
necessary.
Check and change as
NO
necessary.
Check and change as
NO
necessary.
YES Change HV1 or PWB-A.
YES Perform steps 4 and onward.
Check connectors and
NO harnesses and perform steps 2
and 3.
NO Change PCB Scanner.
Change Inverter or exposure
YES
lamp, in that order.
NO Change PCB Main.
NO Install them properly.
YES Clean or change.