Specifications
4-39
(3) Low Image Density
Section Step Check Item Result Action
1
Does the image get better when a
copy is made with new paper
loaded?
YES
Change the paper. Instruct the
user on the storage of paper.
2 Is toner empty? YES
Check Sub Hopper Toner
Empty Switch S4 and change
the Toner Bottle.
3
Is the image transfer current
terminal intact?
NO
Check and change as
necessary.
4
Is the developing bias terminal
intact?
NO
Check and change as
necessary.
5
Does the image density remain
low even after the I/C has been
replaced with a new one?
NO This completes the procedure.
Printer
engine
6
Does the image density become
higher when adjust the “Image
Density” by Unique Switch F:3?
YES This completes the procedure.
1
Is the Scanner drive transmission
mechanism in good condition?
NO
Check and change as
necessary.
YES
Change PCB AFE, PCB
Scanner, PCB Main, PCB
Connect or PWB-A, in that
order.
Scanner
2
Do the connections from CCD
Þ
PCB AFE
Þ
PCB Scanner
Þ
PCB Main
Þ
PCB Connect
Þ
PWB-A remain intact?
NO Reconnect.
(4) Foggy Background
Section Step Check Item Result Action
—— 1
Is sunlight or any other
extraneous light entering the
copier?
YES
Protect the copier from
extraneous light.
1
Is the PC Drum dirty with foreign
matter?
YES Clean the PC Drum.
2
Is the PC Drum charge voltage
terminal in good condition?
NO
Check and change as
necessary.
3
Is the grid voltage terminal in
good condition?
NO
Check and change as
necessary.
4
Is the developing bias terminal in
good condition?
NO
Check and change as
necessary.
5
Is the Charge Neutralizing Sheet
voltage terminal in good
condition?
NO
Check and change as
necessary.
6 Is Eraser Lamp dirty? YES Clean.
7
Does foggy background persist
even after the I/C has been
replaced with a new one?
NO This completes the procedure.
Printer
engine
8
Does foggy background persist
when adjust the “Image Density”
by Unique Switch F:3?
NO This completes the procedure.
1 Are the mirrors and lens dirty? YES Clean or change.
2
Is the Exposure Lamp dirty or
deteriorated?
YES Clean or change.
3
Do the connections between the
Exposure Lamp and INVERTER
remain intact?
NO Reconnect.
Scanner
4
Do the connections from
INVERTER to PCB Scanner
remain intact?
NO Reconnect.