General Troubleshooting 4-41
Electrical Noise
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ HVPS/Engine Logic Board
■ Print Cartridge Right Guide
Assembly
■ Fuser Assembly
■ Print Cartridge
■ ANT Harness Assembly
■ AC Power Harness Assembly
■ LVPS Harness Assembly
■ Optional 550-Sheet Paper
Feeder
■ 550-Sheet Feeder PWBA
■ Duplex Unit PWBA
■ “Print Engine Plug/Jack Locator” on page 10-3
■ “Print Engine General Wiring Diagram” on
page 10-17
■ “Print Cartridge, Transfer Roller Assembly” on
page 10-21
■ “Fuser Assembly, Power Switch” on page 10-20
■ “24 V Interlock, Rear Cover Switch, Main Motor, Sub
Fan, Exit Motor Assembly” on page 10-18
■ “550-Sheet Feeder Plug/Jack Locator” on
page 10-10
■ “550-Sheet Feeder Signal Diagram” on page 10-28
■ “Duplex Unit Plug/Jack Locator” on page 10-12
■ “Duplex Unit Signal Diagram” on page 10-30
Troubleshooting Procedure
Steps Actions and Questions Yes No
1
Check for foreign noise:
Are there any other electrical
appliances within 3 m of the printer,
such as generators, radios, and
appliances with motors?
Go to step 2. Go to step 3.
2
Either turn off the other electrical
appliances, or re-locate the printer at least
6 m from other appliances.
Does the electrical noise problem still
occur?
Go to step 3 Problem solved.
3
Check the AC ground.
Is AC power supply outlet wired and
grounded correctly?
Go to step 4. Request that the
customer fix the
AC power supply
outlet.
4
Check the AC Power Harness Assembly.
Is the cable connected to the AC Power
Harness Assembly correctly grounded?
Go to step 5. Install the ground
screw correctly.
5
Replace the Print Cartridge.
Does the electrical noise problem still
occur after replacement?
Go to step 6. Problem solved.
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