Lexmark OptraImage 443, Service Manual

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3-7
3.2.2 Tables
The tables in this section provide detailed troubleshooting information.
3.1.1.7
3.1.1.7 3.1.1.7
3.1.1.7 The Power LED does not go on
The Power LED does not go on The Power LED does not go on
The Power LED does not go on
Cause
Cause Cause
Cause Relevant Unit
Relevant Unit Relevant Unit
Relevant Unit Check Method
Check Method Check Method
Check Method
◆ ◆ ◆ ◆
Maintenance Method
Maintenance Method Maintenance Method
Maintenance Method Remark
Remark Remark
Remark
Unplugged from outlet None Visual check Insert the AC plug
into the outlet. None
AC power unplugged
at unit None Visual check Insert the AC cable
into unit. None
Power switch is OFF None Visual check Turn the power
switch on. None
Power unit AC input
connector
disconnected None Visual check Connect the
connector. None
Power switch
connector
disconnected None Visual check Connect the
connector. None
Power unit-main PCBA
connection failure None Visual check Connect the
connector. None
Power unit output
voltage failure Power unit Output voltage (+5V)
check
✸
Replace the power
unit None
PCBA Failure *main control PCBA
*LED board
Tester check (+5V,
GND)
✸
Remove the cause or
replace the PCBA. None
LED board-main PCBA
connection failure None Visual check Connect the
connector None
Table 3.3
Table 3.3 Table 3.3
Table 3.3
◆ ◆ ◆ ◆
= Check method explains how to check the failed item.
The 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 section
4.6)
✸
= Refer to section 4.6.