Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
6-104
6.4.12 Background
NOTES
:
a. Without the Diagnostic tool, skip the Diagnostic Tool test (DG) portion of steps 2 and 3.
b. There is no corresponding control panel message for this item.
c. This FIP may also fix BTR, fuser, or drive gears.
d. Try another Toner Cartridge first. If the front door has been opened or a new Toner Cartridge
has been installed, run at least two prints to see if background disappears
PROBLEM
There is toner contamination on all or part of the page. The contamination appears as a very
light gray dusting.
INITIAL ANALYSIS
Inspect the following components. Are they compatible with your printer version, cor-
rectly installed, not damaged, deformed, or contaminated?
Toner Cartridge LVPS Assembly
MCU PWB Harness Assembly
HVPS Earth Plate Assembly
ROS Assembly
Inspect the printer paper path. Is it clear of foreign matter, such as staples, paper clips, and
paper scraps?
1. HVPS CR (DC)
Use Diagnostic Tool Test DG92 to check if the HVPS is supplying –350VDC
to the BCR.
Is the output voltage correct?
Yes No
Go to Step 2. Go to Section 6.3.19 HVPS CR Failure .
2. HVPS DB
Use Diagnostic Tool Test DG93 to check if the HVPS is supplying –250VDC to the Magnet Roll.
Is the output voltage correct?
Yes No
Go to Step 3. Go to Section 6.3.20 HVPS DB Failure .
3. Toner CARTRIDGE
Install a new Toner Cartridge.
Is the background still on the page?
Yes No
Go to Step 4 Problem solved.