Printronix L1024, Maintenance Manual

Page: 282 / 372

13–10 Chapter 13 – Troubleshooting Guide
The defect could be a broken or damaged tooth, or it could be toner buildup in the base of the
teeth on a gear. The pitch or interval of the error is equal to the circumference of the gear, or
the circumference of the base of the teeth.
The approximate diameter of the gear can be found by using the equation
d
+
c
p
where d is the diameter of the gear, c is the interval of the error, which is equal to the
circumference of the gear, and
p
= 3.14. This will give you a general idea of the size of the
gear at fault.
151. White or black horizontal line with an interval of 1.5 inches.
a. This is usually caused by the inner transfer gear in the developer gear assembly. The
gear breaks at its shaft and tends to slip. Remove the developer gear assembly and
replace the inner transfer gear.
152. White or black horizontal lines with a repeating interval.
a. Find the approximate diameter of the defective gear as shown above and replace the
gear or its associated assembly.
153. Occasional white streak at an inconsistent interval.
a. The drive gear for the developer gear assembly is broken at the point where it
connects to the shaft. Replace the gear with one that has reinforcing ribs.
160. Faint black horizontal lines occur at random.
161. The plastic paper guide on the transfer charger is not installed correctly. Make sure it is
locked down by sliding it to the right.
170. There is no print at the top of the page accompanied by a 1 inch black streak 1.5 inches
down the page. The streak may repeat 5 inches down from the original streak.
171. The OPC drum ground connection is faulty, and the OPC drum cleaning system cannot
remove the residual toner from the drum. The erase LEDs cannot reduce the drum
potential to 0 volts.
a. Check the OPC drum ground spring and replace it if needed.
b. Replace the OPC drum unit.
172. The cleaning brush/tension roller does not have the correct voltage.
a. Check and lengthen the spring contact if needed.
b. Replace the OPC drum as its contact for the cleaning station is defective.
c. Check and replace the H.V.P.S. if needed.
200. Vertical Image Errors.
210. Narrow white line (sharp edges).
This line is not present when the laser beam is blocked at the LSU cover glass.