Muratec MFX-2500 Field Engineering Manual page 253

(3) Low Image Density
Section Step
Does the image get better when a
1 copy is made with new paper
loaded?
2 Is toner empty?
Is the image transfer current
3
Printer terminal intact?
engine
Is the developing bias terminal
4
intact?
Does the image density remain
5 low even after the I/C has been
replaced with a new one?
Does the image density become
6 higher when adjust the "Image
Density" by Unique Switch F:3?
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?
(4) Foggy Background
Section Step
Is sunlight or any other
—— 1 extraneous light entering the
copier?
Is the PC Drum dirty with foreign
1
matter?
Is the PC Drum charge voltage
2
terminal in good condition?
Is the grid voltage terminal in
3
good condition?
Is the developing bias terminal in
4
good condition?
Printer
Is the Charge Neutralizing Sheet
engine 5 voltage terminal in good
condition?
6 Is Eraser Lamp dirty?
Does foggy background persist
7 even after the I/C has been
replaced with a new one?
Does foggy background persist
8 when adjust the "Image Density"
by Unique Switch F:3?
1 Are the mirrors and lens dirty?
Is the Exposure Lamp dirty or
2
deteriorated?
Do the connections between the
Scanner
3 Exposure Lamp and INVERTER
remain intact?
Do the connections from
4 INVERTER to PCB Scanner
remain intact?
Check Item
Check Item
4-39
Result Action
Change the paper. Instruct the
YES
user on the storage of paper.
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.
NO This completes the procedure.
YES This completes the procedure.
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
Protect the copier from
YES
extraneous light.
YES Clean the PC Drum.
Check and change as
NO
necessary.
Check and change as
NO
necessary.
Check and change as
NO
necessary.
Check and change as
NO
necessary.
YES Clean.
NO This completes the procedure.
NO This completes the procedure.
YES Clean or change.
YES Clean or change.
NO Reconnect.
NO Reconnect.