Service manual

SRP-150
Rev. 1.02
- 44 -
Printing quality problems
Problem Probable Cause Level Checkpoint Action
Foreign substances on the
surface of the head
A
Check the foreign
substances on the head
surface
Remove the foreign
substance using
cleaning pen
Surface of the head is
damaged
B
Check the damage to the
head surface such as dents
Replace the head
Internal IC of the head is
damaged
B
Damage to the internal IC
of the head
Replace the head
Certain parts
are printed in
white lines
vertically
When there is a vertical
scratched trace on the paper
A
Check whether there are
obstacles such as bumps in
the path the paper moves
Remove the
obstacles
Certain parts
are printed in
black lines
vertically
Damage of the internal IC of
the head
B
Damage to the internal IC
of the head
Replace the head
Irregular feeding B
Check the damage to the
gears and foreign
substances in the gear
profile.
Replace the gears
or remove the
foreign substances
Feeding motor failure B
Check whether the motor
runs smoothly without
friction.
Replace the motor
Horizontal
black lines
are
generated, or
the vertical
width of the
characters is
reduced
The roller does not rotate
smoothly
A
Check whether sufficient oil
remains in the bearings
holding the roller.
Fill the oil in the
bearings
The roller and the head are
not attached properly.
A
The cover is not completely
closed.
Open the cover
and close it again
completely
The spring pushing the head is
not strong enough
B
Check whether the screws
holding the spring are
loose.
Fasten the screws
Overall
printing
density is low
The head surface is damaged B
Check the abrasion on the
head surface.
Replace the head