Image Quality Issues - Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL

6.5.4 Image Quality Issues

symptom
Offset Ghost(Positive Ghost) If the interval of image is about 90
mm,the paper is unsuitable.
The paper is too dry.
Low humidity condition.
Paper feeding direction
Smear around solid black image If smear around solid black image,
transfer bias is low.
The paper is too dry.
The paper is high impedance.
Paper feeding direction
Broken line
The paper is rough.
Paper feeding direction
Faded print image (GAZURE) If the faded print image on both
side of 100% solid black image,
The paper smoothness is high.
Paper feeding direction
45487001TH Rev.1
Cause Remedy
Use supported paper.
Use paper stored in proper
temperature and humidity
conditions.
Press the ▼ button and select
[menus] > [Print Adjust], and then
select "ON" for [Quiet Mode].
Press the ▼ button and select
[menus] > [Print Adjust], and then
change to "+3" the value for [Paper
Black setting].
Use supported paper.
Press the ▼ button and select
[menus] > [Tray Configuration] >
the paper try configuration you
are using, and then select "heavy"
or more value for [Media Weight].
Use supported paper.
Front and back of paper inside
out
Press the ▼ button and select
[menus] > [Tray Configuration] >
the paper try configuration you
are using, and then select "heavy"
or more value for [Media Weight].
Use lower smoothness paper.
symptom
Some dots in white area After added new toner
When print in the high
temperature(HH,HL)
When print at the low speed
Paper feeding direction
Ghost vertical long solid line
B
Paper feeding direction
Wrinkle The paper is too moist.
The paper is too thin.
Paper feeding direction
Graininess When half tone density is high.
Paper feeding direction
Faded print at low density half tone image When half tone density is low
When print in the low
B B B B B B B B
temperature(LL)
B B B B B B B B
Paper feeding direction
6. Troubleshooting procedure
Cause Remedy
Press the ▼ button and select
[menus] > [Print Adjust], and then
change the value(+2 or +3) for [BG
Setting].
Press the ▼ button and select
[menus] > [Print Adjust], and then
change the value(+2 or +3) for
[SMR Setting].
Set envelope mode of fuser
Press the ▼ button and select
[menus] > [Tray Configuration],
and then select "Ultra heavy 1" for
[Media Weight].
Press the ▼ button and select
[menus] > [Print Adjust], and then
change the value(+2 or +3) for [BG
Setting].
Press the ▼ button and select
[menus] > [Print Adjust], and then
change the value(+1 or +2) for
[Darkness].
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