KPOWERSCIENCE KP3828 Series, Maintenance Manual

Page: 219 / 230

8-47
8. Printing quality (continued)
Re
m
arks
See “Prin
ter Installation Space”
on Chapter 3.
(1
)
Number of dots per 25.4mm
{dpi}
300:5.42 * n (mm
)
Re
m
edy
Provide eno
ugh space at the rear
of the printer to enable cooling air to flow
.
Check the o
peration of the fuser
exit b
lower and the f
use
r unit
upper fan and perform replacem
ent if necessary
.
Replace th
e LED array
.
Set the developing bias to the prescribed v
alue.
Set the LED strobe du
ty to the
prescribed v
alue.
Replace th
e LED array
.
Clean LED array with s
pecia
l
cloth. Align the L
E
D array with the
pin and then fix the LED array
.
Cause
The rear face of the printer is
too clos
e to the wall.
Failure of
fuser section
cooling (stoppage of fus
er exit
blower or fuser unit upper fan)
Malfunction of the LED array The developing bias setting is
too low
.
The LED strobe duty setting
is too sm
all.
The LED array is close to the
end of its life. Toner is attached to LED array
.
Alignm
ent is not perform
ed by
using the pin during replacem
ent of the LED array
.
Phenom
enon
6.
The printing density becom
es
low
.
7.
Printing is stopped com
pletely or becom
es light
at a certain width
(1
)
8.
The print is too ligh
t in
general.
9.
The print becom
es too light.
10.
Horizontal lines becom
e
slanted. The
resolu
tio
n
is
lowered due to an out-of-focus condition.
-To be continued-