Star Micronics LS-5 SERIES Technical Manual page 124

TROUBLESHOOTING
P-4. Vertical white bands
Print sample
Step
1 (Humidity and wrinkling of the paper)
Does the problem occur even if the paper is replaced with new
paper?
2 (Obstruction of the laser beam path)
Is there any foreign matter or grime in the path of the laser beam
between the ROS assy and the drum?
3 (Faulty BTR assy)
Is there any foreign matter or grime on the BTR of the BTR
assy?
4 (Faulty EPX toner cartridge)
Does the problem stop occurring when the EPX toner cartridge
is replaced with a new one?
White spaces in print
(This refers to printing in which bands of the image are missing in the paper
transport direction, or certain bands in the paper transport direction are too light.)
Check parts with different specifications for problems with usage, defective
installation, breakage, deformation, and adhesion of grime or foreign matter.
• Main parts to be checked:
(1) EPX toner cartridge, (2) BTR assy, (3) MCU PCB, (4) Fuser assy
(5) ROS assy
Check
– 120 –
Symptom
Initial check
Measure (if abnormal)
Replace paper.
(Request that the customer store the
paper in a location where there is low
humidity.)
Remove any foreign matter or grime
obstructing the path of the laser beam
from the ROS assy to the drum.
Replace BTR assy.
Replace EPX toner cartridge.