Dead Machine Service Check - Lexmark 632n - T B/W Laser Printer Service Manual

Dead machine service check

A dead machine is a condition where the display is blank, the LED on the operator panel is off, no
fans turn, no motors turn, and the fuser lamp does not come on.
If a high-capacity input tray is installed, remove the option and check the base printer for correct
operation. If the base printer operates correctly, go to
check" on page
attached paper handling options.
Warning: Observe all necessary ESD precautions when removing and handling the system board
or any installed option cards or assemblies. See
page
CAUTION: When you see this symbol, there is a danger from hazardous voltage in the
area of the printer where you are working. Unplug the printer before you begin, or use
caution if the printer must receive power in order to perform the task.
Remove any input and output paper handling options from the printer.
FRU
1 Line voltage
2 AC line cord
3 +5 V dc test point on the
system board
4 System board and
interconnect board
2-56. If the base printer continues to not operate correctly, remove any other
4-1.
Action
Check the AC line voltage. If the line voltage is incorrect, inform the
customer.
Unplug the line cord from the wall outlet and check the line cord for
damage, such as, a damaged plug, or cut or damaged cord. If
incorrect, replace the cord. If incorrect, check the continuity of the line
cord and replace if necessary. If the cord is correct, go to step 3.
Check for approximately +5 V dc at the +5 V test point on the system
board.
Note: Use care not to short adjacent voltage test points.
If the voltage is correct, replace the system board assembly. If the
voltage is incorrect, go to step 4.
Check the system board is firmly seated in connector J7 on the
interconnect board. If it is not seated correctly, reseat and recheck
the voltage at the +5 V dc test point on the system board.
If test point does not measure +5 V dc, go to step 5.
"High-capacity feeder input tray service
"Handling ESD-sensitive parts" on
+42V
+24V
+5V
+3.3V
HEAT
GND
Diagnostic information
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