Star Micronics LS-5 SERIES Technical Manual page 130

TROUBLESHOOTING
P-10. Black dots
Print sample
Step
1 (Faulty BTR assy)
Is there any foreign matter or grime on the BTR of the BTR
assy?
2 (Faulty EPX toner cartridge)
Does the problem stop occurring when the EPX toner cartridge
is replaced with a new one?
(If the problem is with the drum surface, the spots will occur at
intervals of approximately 94 mm.)
3 (Faulty heat roll)
Are there any scratches, foreign matter, grime, or other irregu-
larities on the heat roll?
(Check this if the spots are occurring at intervals of approxi-
mately 62 mm.)
4 (Faulty pressure roll)
Are there any scratches, foreign matter, grime, or other irregu-
larities on the pressure roll?
(Check this if the spots are occurring at intervals of approxi-
mately 61 mm.)
Black spots on the print
(This refers to printing in which there are round images appearing on the printed
image.)
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) Fuser assy, (4) Heat roll
(5) Pressure roll
Check
– 126 –
Symptom
Initial check
Measure (if abnormal)
Replace BTR assy.
Replace EPX toner cartridge.
Replace heat roll.
Replace pressure roll.