Power Supply (Dead Machine) Service Check - Lexmark X925 Service Manual

7541-03x

Power supply (Dead machine) service check

Note: Before proceeding, make sure that this is not an issue with the display. Turn the machine on. If the
machine's fans, and motors start up, it could be an issue with the display.
Step Action and questions
1 Is the power cord connected to the printer and the wall
outlet?
2 Connect the power cord to the printer and wall outlet.
POR the printer. Did it start?
3 Try a different power cord. Did this fix the problem.
4 Verify that the voltage to the machine is within
spec.110v, ac +/- 10%, 220v, ac +/- 10%. Is the voltage
in within spec?
5 Verify that the cables connecting the power inlet, the
switch and secondary power supply are properly
connected.
6 Verify that the cables connecting CN02 on the
secondary power supply unit to CN03 on the LVPS are
connected properly.
7
Replace the switch. Did this fix the problem.
8 Are the fuses blown on either supply?
Replace the power supply with the blown fuse. Did this
9
fix the problem?
10 Check CN03 on the scanner power supply for the
following voltages and grounds:
Pins 1,and 2 should be +5V dc
Pins 2 and 4 should be + 24V dc
Pins 5,6,7, and 8 are GND
Are the voltages correct?
11 Replace the RIP board. See
page
12 Check CN03 on the low voltage power supply for the
following voltages and grounds:
Pins 4,and 8 should be +5V dc
Pins 2 and 6 should be + 24V dc
Pins 1,3,4, and 7 are GND
Are the voltages correct?
13 Replace the printhead controller board. See
"Printhead controller board removal" on page
Did this fix the problem?
2-92
Service Manual
"RIP board removal" on
4-73. Did this fix the problem
Yes
Go to step 3.
Problem solved
Problem solved
Go to step 5.
Go to step 6.
Go to step 7.
Problem solved
Go to step 9.
Problem solved
Go to step 11.
Problem solved.
Go to step 13
Problem solved.
4-37.
No
Go to step 2
Go to step 3.
Go to step 4.
Try a different
power outlet.
Properly connect
the cables.
Properly connect
the cables.
Go to step 8.
Go to step 10.
Go to step 10
Replace the
scanner power
supply. See
"Scanner power
supply removal"
on page 4-58.
Go to step 12
Replace the
LVPS. See "Low
volt power
supply removal"
on page 4-51.
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