HP LaserJet Pro CP1025 Service Manual - Page 100

Problem, Sample, Cause, Solution, Replace the ITB.

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Problem Print is light or faded in a particular color. Sample Image is too dark. Page is blank. The page is all black or a solid color. Cause Solution A poor contact exists in the developing bias contacts of the developing cartridge. ● If dirty, clean the contacts of the product and developing cartridge (reapply black conductive grease). ● Check the contacts for damage. Replace any deformed or damaged parts. ● Verify that black conductive grease is applied to the contact. If the contacts are not greased, apply grease to the contacts. ● Replace the developing cartridge. ● If the problem persists, replace the product. The density ITB_TOP sensor is Replace the ITB. defective. The high-voltage power-supply is defective (no developing bias output). Replace the ECU. Poor contact exists in the primary charging bias of the imaging-drum-cartridge. ● Clean the contacts of both the imaging-drum-cartridge and the product ● If the error persists, replace the imaging-drum-cartridge. ● If the error persists, replace the product. 84 Chapter 2 Solve problems ENWW

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Problem
Sample
Cause
Solution
Print is light or faded in a
particular color.
A poor contact exists in the
developing bias contacts of
the developing cartridge.
●
If dirty, clean the contacts of
the product and developing
cartridge (reapply black
conductive grease).
●
Check the contacts for
damage. Replace any
deformed or damaged parts.
●
Verify that black conductive
grease is applied to the
contact. If the contacts are not
greased, apply grease to the
contacts.
●
Replace the developing
cartridge.
●
If the problem persists, replace
the product.
Image is too dark.
The density ITB_TOP sensor is
defective.
Replace the ITB.
Page is blank.
The high-voltage power-supply
is defective (no developing
bias output).
Replace the ECU.
The page is all black or a solid
color.
Poor contact exists in the
primary charging bias of the
imaging-drum-cartridge.
●
Clean the contacts of both the
imaging-drum-cartridge and the
product
●
If the error persists, replace the
imaging-drum-cartridge.
●
If the error persists, replace the
product.
84
Chapter 2
Solve problems
ENWW