Electrical Noise - Xerox 4400DT - Phaser B/W Laser Printer Service Manual

Electrical Noise

Electrical Noise Troubleshooting Procedure
Step Actions and Questions
1 1. Check if there is other electrical equipment, such as
electrical generators, radio transmitters, or devices
using electrical motors, within ten feet of the printer.
2. Shut off the other electrical equipment, or relocate the
printer at least twenty feet away from other devices.
Is the Electrical Noise problem still present?
2 1. Disconnect the AC power cord from the wall outlet.
2. Check the AC wall outlet and power cord (see
Verifying AC Power
Is the AC wall outlet correctly wired and
grounded?
3 1. Open the Front Cover.
2. Remove the Print Cartridge.
3. Inspect both spring-loaded High Voltage contacts on
the Transport Chute Assembly and the terminals on
the Print Cartridge.
Are the terminals in good condition and
contacting properly when the cartridge is
installed?
4 1. Remove the Plate Handle (RRP 1.2 on
2. Inspect the grounding screw and wire connected to
the Main Power Connector.
Is the cable grounded properly?
5 Replace the Print Cartridge (PL 8.1,
Is the Electrical Noise problem is still present?
6 1. Remove the Fuser Assembly (RRP 6.2,
2. Remove the end covers (see RRP 6.9,
3. Inspect the Heater Rod securing screws and lead
wires.
Are the securing screws tight and the lead wires
in good condition?
7 Disconnect the HVPS (P/J26) from the Engine Logic
Board. Run 20 Test Prints (the prints will be blank).
Do the Test Prints run normally?
8 Replace the Engine Logic Board (RRP 9.3 on
page 6-89).
Is the problem still present?
Phaser 4400 Laser Printer Service Manual
on page 3-2).
page
page 7-20).
page
Yes
Go to step 2.
Go to step 3.
Go to step 4.
6-7). Go to step 5.
Go to step 6.
page 6-66). Go to step 7.
6-77).
Replace the
HVPS PWB
Assembly
(RRP 9.6 on
page
Go to step 9.
No
Problem
solved.
Inform the
customer of
insufficient
voltage or
improper
wiring. A
licensed
electrician
must correct
the wiring.
Replace as
necessary:
Transport
I
Chute
Assembly
(RRP 6.1 on
page 6-65)
Print
I
Cartridge (PL
8.1,
page 7-20).
Attach the
grounding
screw
properly.
Problem
solved.
Tighten the
securing
screws or
replace the
Fuser
Assembly
(RRP 6.2 on
page 6-66).
Go to step 8.
6-92).
Problem
solved.
3-33