Phaser 6121MFP Service Manual 4-29
General Troubleshooting
Electrical Noise
There is a variable pitch sound coming from the printer. Electrical noise can be
either noise in the electrical lines or static in electromagnetic communications.
Initial Actions
• Cycle printer power.
• If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ HVPS, PL4.1.19
■ Fuser, PL11.0.18
■ Imaging Unit, PL4.1.21
Board Locations (page 2-10)
Main Engine Component Overview
(page 2-10)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1Check external noise.
■ Are there other electrical appliances
within 3 meters of the printer?
■ Turn the electrical appliances Off or
relocate the printer at least 6 meters
away from other electrical appliances.
Does the electrical noise still persist?
Go to step 2. Complete.
2 Check the AC ground.
Is the AC power supply outlet wired and
grounded appropriately?
Go to step 3. Request the
client to fix
AC power
supply
outlet.
4 Check the High Voltage Board and the six
high voltage springs for dirt.
If dirty, remove the High Voltage Board
and clean it and the six springs.
(page 8-57).
Does the electrical noise still persist?
Go to step 5. Complete.
5 Reseat the Imaging Unit and the Fuser. Complete.
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