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

Low Toner Sensor Failure Troubleshooting Procedure (cont'd.)
Step Actions and Questions
8 Check the Connector Harness Assembly.
Is the Connector Harness Assembly OK?

Inoperative Printer

No response from printer when the main power is switched on.
Inoperative Printer Troubleshooting Procedure
Step Actions and Questions
1 Ensure the power cord is properly connected to the wall
outlet and to the Power Receptacle of the printer.
Does the problem still exist?
2 Perform Verifying AC Power
here.
Did "Verifying AC Power" indicate that correct
AC voltage is being supplied to the printer?
3 Perform DC Power (LVPS)
here.
Did "DC Power (LVPS)" indicate that correct DC
voltage is being supplied to the printer?
4 Did "DC Power (LVPS)" instruct you to replace a
component?
5 On the Image Processor Board, check the voltage on
J910 between pins 1 and 2.
Is the voltage +3.3 VDC?
6 1. Switch the printer power OFF.
2. Disconnect J910 from the Image Processor Board.
3. Switch the printer power ON.
4. Check the voltage between pins 1 and 2 on the
disconnected plug.
Is the voltage +3.3 VDC?
Phaser 4400 Laser Printer Service Manual
on page 3-2, then return
on page 3-4, then return
Yes No
Replace the Replace the
Engine Logic Connector
Board (RRP Harness
9.3 on Assembly
page 6-89). (PL 8.1 Drive
and
Xerographics
on page 7-20
Yes No
Go to step 2. Problem
solved.
Go to step 3. Notify
customer
that the
power is out
of
specification.
Go to step 5. Go to step 4.
Replace Perform
component Power
as Loading
necessary. page 3-6.
Go to step 8. Go to step 6.
Go to step 7. Replace the
LVPS (RRP
9.5 on
page
DC
on
6-91).
3-9