Uneven Density Vertically - Kyocera ECOSYS P2235dn Service Manual

(1-8) Uneven density vertically

Image sample
Trouble location
1 LSU
2 Transfer roller
3 Drum unit
4 Developer unit
1. Uneven LSU laser beam emission.
2. Transfer belt contact failure with the drum.
3. Drum condensation.
4. Uneven toner layer on the developer roller
Check
Laser is not output evenly from
LSU. (Internal mirror drop-off)
Check the attaching condition of
the transfer roller. (Uneven pres-
sure to the drum)
1. Check if toner spreads
evenly on the drum.
2. Check if it is used at high
humidity.
3. Check if the drum surface is
worn down.
1. Check if the toner layer thick-
ness on the developer roller
is even.
2. Check if the DS pulleys the
sides of the developer rollers
are dirty or damaged. (Fail-
ure of the developer roller to
contact the drum surface)
Factor
Reattach the LSU. Or, replace.
(see page 4-26)
If the transfer roller is at incorrect position, cor-
rect it and reattach them. Or, replace the PF
PWB.
(see page 4-87)
1. Execute the drum refreshing. ([System
Menu] > [Adjustment/Maintenance])
2. Use in the environment without condensa-
tion.
3. Replace the drum unit.
(see page 4-11)
1. Refresh toner by consuming toner with
continuous test pages.
2. Clean the developer roller and DS pulley.
Replace the developer unit if broken. (see
page 4-10)
7-42
2RV/2RW/2RX/2RY/3RA-1
Measures