Lexmark X642e Service Manual page 183

Paper size switch not selecting paper size that is selected
FRU
1 Paper size switch
High-capacity feeder option
control board
24x.xx Paper Jam Check Tray x
FRU
1 High-capacity feeder option
control board
2 Elevator top optical sensor
cable
Elevator top optical sensor
displays; tray does not respond to loading paper; no response from the
Tray x Empty
front door switch
FRU
1 High-capacity feeder option
control board
2 Elevator top optical sensor
cable
Elevator top optical sensor
Action
Check for continuity between the common pin (J5-1) and the pin of
the paper size selected.
Pin Color Paper size
J5-1 Black Common lead
J5-2 Blue B5
J5-3 Green Executive
J5-4 Yellow A4
J5-5 Orange Letter
J5-6 Red Legal
J5-7 Brown A5
If any position does not measure continuity when selected, replace
the paper size switch assembly. If the switch assembly is operating
correctly, replace the high-capacity feeder option control board.
displays when tray x is empty; tray x does not display
Action
Check the voltages on the board at J4-1(red) and J4-3 (blue). The
voltages measure approximately +5 V dc. If incorrect, disconnect J4
from the board and measure the voltages again. If incorrect, replace
the high-capacity feeder option control board.
Check the continuity of the sensor cable. If incorrect, replace the
cable. If correct, replace the top optical sensor assembly.
Action
Check the voltage on the board at J4-2 (green). The voltage
measures approximately +5 V dc. If incorrect, disconnect the cable at
J4 and check the voltage again. If incorrect, replace the high-capacity
feeder option control board.
Check the continuity of the sensor cable. If incorrect, replace the
cable. If correct, replace the top optical sensor assembly.
7002-xxx
2-145
Diagnostic information