Utax CLP 3521, Service Manual, Page: 84 / 187

2HL/2HM/2HN
1-4-31
1-4-5 Mechanical problems
Problem Causes/check procedures Corrective measures
(1)No primary paper
feed. Check if the surfaces of the paper feed roller,
MP paper feed roller are dirty with paper pow-
der. Clean with isopropyl alcohol.
Check if the paper feed roller, MP paper feed
roller are deformed. Check visually and replace any deformed
rollers (See page 1-5-8 and 1-5-12).
Defective paper feed clutch installation. Check visually and remedy if necessary.
(2)No secondary paper
feed. Check if the surfaces of the upper and lower
registration rollers are dirty with paper pow-
der. Clean with isopropyl alcohol.
Defective registration clutch installation. Check visually and remedy if necessary.
(3)Skewed paper feed. Width guide in a cassette installed incorrectly. Check the width guide visually and correct
or replace if necessary.
Deformed width guide in a cassette. Repair or replace if necessary.
Defective MP tray slider installation. Check the slider visually and correct or
replace if necessary.
Deformed MP tray slider. Check visually and replace any deformed
slider.
(4)Multiple sheets of
paper are fed at one
time. Check if the paper is curled. Replace the paper.
Paper is not placed correctly in the cassette. Set the paper correctly.
Check if the retard roller is worn. Replace the retard roller pulley if it is worn.
Check if the separator pad or MPF separation
pad (duplex model only) is worn. Replace the separator pad if it is worn (See
page 1-5-10).
(5)Paper jams. Check if the paper is excessively curled. Replace the paper.
Check if the contact between the front and
rear registration rollers is correct. Check visually and remedy if necessary.
Check if the heat roller or press roller is
extremely dirty or deformed. Replace the fuser unit (See page 1-5-26).
(6)Toner drops on the
paper conveying path. Check if the drum unit or developing unit is
extremely dirty. Clean the drum unit or developing unit.
(7)Abnormal noise is
heard. Check if the pulleys, rollers and gears operate
smoothly. Grease the bearings and gears.
Check if the following electromagnetic
clutches are installed correctly: Check visually and remedy if necessary.