HP M750 series

Problem Sample Cause Solution
Print is light or faded in a
particular color.
Poor primary transfer bias
contacts on the ITB unit and
product.
Clean the contacts of the color that
produces the light print. If the
problem remains after cleaning, check
the contacts for damage. Replace any
deformed or damaged parts.
Poor primary charging bias
contacts with the print cartridge
and product.
Poor developing bias contacts
with the print cartridge and
product.
Image is too dark.
The registration density (RD)
sensor is defective.
Replace the RD sensor.
Page is blank.
The imaging high-voltage
power-supply is defective (no
developing bias output).
Replace the imaging high-voltage
power-supply .
The page is all black or a solid
color.
Poor contact exists in the
primary charging bias or
developing bias contacts
between the print cartridge and
the product.
Clean each contact of the color that
produces the all black or solid color. If
the problem remains after cleaning,
check the contacts for damage.
Replace any deformed or damaged
parts. Replace the affected print
cartridge.
White spots appear in an image
Poor conductivity caused by dirt
on the static eliminator.
Clean the static eliminator.
The primary transfer roller is
deformed or has deteriorated.
Replace the ITB.
The secondary transfer roller is
deformed or has deteriorated.
Replace the secondary-transfer-roller.
518 Chapter 3 Solve problems ENWW