Lexmark Optra 4049 Series, Service Manual

Page: 39 / 194

Diagnostic Information 2-12
4049-XXX
Banding
Banding appears as light and dark horizontal lines on a page that is
supposed to be uniformly gray. It is due to variation in the speed of
the paper as it moves from roll to roll during development or transfer.
It is undetectable when printing text and is most noticeable on fine
dot or horizontal line patterns such as the second page of Print
Test 2 or Print Test 3. Inspect the gear train and the paper feed roll-
ers for wear, damage, dirt, or binds.
Background
Areas that are supposed to stay blank are getting small amounts of
toner deposited on them. Clean the erase lamps and the printhead
window.
Verify that all the erase lamps are working by powering on or off with
the top cover open. Verify that there is +24VDC on engine board
Regularly Spaced Marks “Regularly Spaced Marks” on page
2-32
.
Skew, all edges “Skew, all edges” on page 2-33 .
Skew, top and bottom only “Skew, top and bottom only” on page
2-33
.
Light Print “Light Print” on page 2-21 .
Blurred or Fuzzy Print “Blurred or Fuzzy Print” on page
2-15
.
Residual Image “Residual Image” on page 2-32 .
Honeycomb “Honeycomb” on page 2-20 .
Background “Background” on page 2-12 .
Horizontal Void or Streak “Horizontal Void or Streak” on page
2-20
.
Vertical Void or Streak “Vertical Void or Streak” on page
2-34
.
Banding “Banding” on page 2-12 .
Symptom Go To