Star Micronics LS-5 SERIES Technical Manual page 129

P-9. Blank spots
Print sample
Step
1 (Humidity and wrinkling of the paper)
Does the problem occur even if the paper is replaced with new
paper?
2 (Humidity and wrinkling of the paper)
Does the problem occur even if the paper is replaced with new
paper?
3 (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.)
4 (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.)
5 (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.)
Missing spots
(This refers to printing in which there are spots missing in 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
– 125 –
TROUBLESHOOTING
Symptom
Initial check
Measure (if abnormal)
Replace paper.
(Request that the customer store the
paper in a location where there is low
humidity.)
Replace BTR assy.
Replace EPX toner cartridge.
Replace heat roll.
Replace pressure roll.