Lexmark X7500 Service Manual - Page 47

Symptom Tables, Power does not come on.

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4036-501 Symptom Tables Power does not come on. Cause Relevant unit Check method* Unplugged from outlet AC power unplugged at power supply Power switch is off None None MFD controller cage Visual check Visual check Visual check Power supply power distribution board connection failure Power supply output voltage failure None LVPS Power distribution board failure Power distribution board Visual check Tester check the LVPS (+5V, +12V, +24V, GND) Tester check (+5V, GND) MFD controller board MFD controller board None Maintenance method Insert the AC plug into the outlet. Insert the AC cable into power supply. Turn the power switch on. Connect the connector. Replace the power supply. Replace the failed power distribution board. If problem persists, replace MFD controller board. Note: *= check method explains how to check the failed item. T • he visual check can be made by physically observing the part or observing the offline test display on the front panel. • The tester check is made by checking the voltage levels of the relevant units. • See "Connector Locations" on page 5-1 for more information. Diagnostic Information 2-7

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Diagnostic Information
2-7
4036-501
Symptom Tables
Power does not come on.
Note:
*= check method explains how to check the failed item. T
•
he visual check can be made by physically observing the part or observing the
offline test display on the front panel.
•
The tester check is made by checking the voltage levels of the relevant units.
•
See
“Connector Locations” on page 5-1
for more information.
Cause
Relevant unit
Check method*
Maintenance
method
Unplugged from
outlet
None
Visual check
Insert the AC plug
into the outlet.
AC power unplugged
at power supply
None
Visual check
Insert the AC cable
into power supply.
Power switch is off
MFD controller cage
Visual check
Turn the power
switch on.
Power supply power
distribution board
connection failure
None
Visual check
Connect the
connector.
Power supply output
voltage failure
LVPS
Tester check the
LVPS (+5V, +12V,
+24V, GND)
Replace the power
supply.
Power distribution
board failure
Power distribution
board
Tester check
(+5V, GND)
Replace the failed
power distribution
board.
MFD controller board
MFD controller board
None
If problem persists,
replace MFD
controller board.