Star Micronics WinType 4000, Technical Manual

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TROUBLESHOOTING
P-7 Vertical black lines
Print Sample Symptom
Black lines in the print
(Black lines with a width of less than 1 mm appear on the paper in the direc-
tion in which the paper was fed into the printer.)
Initial Check
Are any parts dirty, broken, malformed, incorrectly installed or different
from those listed in the specifications?
• Principle Parts to be Checked:
(1) EP toner cartridge, (2) HVPS, (3) MCU PWB, (4) Drive assembly
(5) Heat roller, (6) Pressure roller, (7) Fuser assembly, (8) ROS window
(9) ROS assembly
Step Check Remedy (if not normal)
1 (The laser beam is obstructed.)
Is there any foreign matter or grime in the path of the
laser beam between the ROS assembly and the drum?
2 (The EP toner cartridge is defective.)
Does the problem recur if the EP toner cartridge is
replaced with a new one?
3 (The heat roller is defective.)
Are there any irregularities, such as scratches, foreign
matter or grime, on the heat roller?
Remove any foreign matter or grime
obstructing the path of the laser beam
between the ROS assembly and the drum.
Replace the EP toner cartridge.
Clean or replace the heat roller.
PRINTER