Xerox N2125N - DocuPrint B/W Laser Printer, Service Manual

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02/2000
2-32 DocuPrint N2125
RAP 30 , RAP 31
Initial Issue Status Indicator Repair Analysis Procedures
RAP 30 Laser Assembly
Procedure
Enter Diagnostics and select Component Test. Scroll to ROS Motor and press Enter. You can
hear the ROS Motor spin up.
Y
N
Switch the printer power off. Remove the Left Interface Cover (
REP 1.1 ) Left Cover ( REP
1.2 ), and the Left Plate Assembly ( REP 1.11 ). Switch the printer power on. Check the volt-
age between P/J21 pin 10 on the Print Engine Controller PWB and frame ground. The
voltage is 24.0 VDC.
Y
N
Check the voltage between P/J28 pin 1 on the Print Engine Controller PWB and
frame ground. The voltage is 24.0 VDC.
Y
N
Replace the LVPS (
REP 9.5 ).
Replace the Print Engine Controller PWB ( REP 9.3 ).
Enter Diagnostics and select Component Test. Scroll to ROS Motor Operation. Check the
voltage between P/J21 pin 12 and frame ground. Press the Enter key. The voltage
drops from 5.0 VDC to 0.0 VDC.
Y
N
Replace the Print Engine Controller PWB (
REP 9.3 ).
Replace the Laser Assembly ( REP 7.4 ).
Switch the printer power off. Remove the Left Interface Cover ( REP 1.1 ) Left Cover ( REP 1.2 ),
and the Left Plate Assembly ( REP 1.11 ). Switch the printer power on. Check the voltage
between P21 pin 6 and frame ground. The voltage is +5.0VDC.
Y
N
Check the voltage between P/J28 pin 7 and frame ground. The voltage is +5.0VDC.
Y
N
Replace the LVPS (
REP 9.5 ).
Check the voltage between P/J25 pin 3 and frame ground. The voltage is +5.0VDC.
Y
N
Go to
RAP 36 .
Replace the Print Engine Controller PWB ( REP 9.3 ).
Measure the voltage between P/J21 pin 9 and frame ground. The voltage is +5.0VDC.
Y
N
Replace the Print Engine Controller PWB (
REP 9.3 ).
Replace the Laser Assembly ( REP 7.4 ).
RAP 31 Fuser Assembly
Procedure
WARNING
If the printer has been switched on, the fuser may be hot.
Switch the printer power off. Remove the Fuser Assembly ( REP 6.2 ). Measure the resistance
between pins A4 and A5 of P272 ( Figure 1 ). The resistance is between 7K and 380K ohms
(depending on the temperature of the fuser).
Y
N
Replace the Fuser Top Cover (
REP 6.9 ).
Measure the resistance between pins 3 and 4 of P272 on the Fuser Assembly ( Figure 1 ). The
resistance is less than 5 ohms.
Y
N
Remove the Fuser Heat Rod (
REP 6.9 ). Measure the resistance of the Heat Rod. The
resistance is less than 5 ohms.
Y
N
Replace the Heat Rod (
REP 6.9 ).
Replace the Fuser Top Cover ( REP 6.9 ).
Figure 1 Fuser Connector (P272)
Reinstall the Fuser Assembly. Remove the Left Interface Cover ( REP 1.1 ), Left Cover ( REP
1.2 ), and the Left Plate Assembly ( REP 1.11 ). Disconnect P/J11 from the LVPS PWB. Check
the resistance between P11 pin 1 and pin 2. There is less than 5 ohms resistance.
Y
N
Repair or replace the Fuser Harness Assembly (
REP 6.3 ).
Reconnect P/J11 and disconnect P/J27. Measure the resistance between P/J27 pins 1 and 2
(
Figure 1 ). The resistance is between 7K and 380K ohms (depending on the temperature
of the fuser).
Y
N
Repair or replace the Fuser Harness Assembly (
REP 6.3 ).
A