It Is Foggy At The Background Image - Kyocera ECOSYS P2235dn Service Manual

(1-4) It is foggy at the background image

Image sample
Trouble location
1 Developer unit
2 Drum unit
3 High voltage PWB
4 Main/Engine PWB
1. Toner is deteriorated (becomes had to charge).
2. Over-supply of toner.
3. Developer bias voltage is high.
4. Toner layer on the developer roller surface is thick (too much toner adheres).
5. The drum surface potential is low (low temperature environment)
Check
6. Check if the developer bias
connection terminal is dirty
or deformed.
1. Check if the machine is used
in an environment of low
temperature.
2. Check if the drum unit is
attached improperly.
3. Check if the ground connec-
tion terminal is dirty or con-
ductive grease is applied to
it.
4. Check if the main charge
roller is dirty.
There is the contact failure or
output failure of the developer
bias or main charge current from
the high voltage PWB.
Main/Engine PWB is defective.
Factor
Clean the developer bias connection terminal,
if it is dirty. Correct the terminal if it is deformed
so that it contacts.
If the room temperature is 16 °C/60.8 °F or
less, try to use in the environment of more than
16 °C/60.8 °F.
Reattach the drum unit.
(see page 4-11)
Clean the terminal if it is dirty.
Apply conductive grease to the receptacle side
bearing of the drum drive shaft if little grease is
applied.
Clean the main charge roller if it is dirty.
Replace the drum unit if it does not take the
dirty.
Correct the terminal if it is deformed. Or,
replace the high voltage PWB.
(see page 4-68)
Replace the main/engine PWB.
(see page 4-63)
7-38
2RV/2RW/2RX/2RY/3RA-1
Measures