Cover Open Switch/Cable Service Check - Lexmark T520 Service Manual

Infoprint 1120 and 1125

Cover Open Switch/Cable Service Check

FRU
1 Toner Cartridge
2 Cover Open Switch/Cable
Assembly
2-42
Service Manual
Action
Check the toner cartridge to make
sure it is correctly installed and that
the right and left cartridge tracks are
not loose or broken. Check to make
sure the cover open switch
activation tab on the toner cartridge
is not broken and that the tab
correctly activates the cover open
switch spring.
Check the cover open switch for
proper mechanical operation. If
incorrect, repair as necessary.
Disconnect the cover open switch
cable from J4 at the engine board
and measure the voltage at J4-3. It
measures approximately +5 V dc. If
the voltage is incorrect, replace the
engine board. If the voltage is
correct, check the voltage at J4-1. If
the voltage measures greater than
+1.0 V dc, replace the engine board.
If the voltage is correct, check the
continuity between J4-1 and J4-3 on
the cable. If no change in continuity
occurs as the switch is activated,
replace the cover open switch/cable
assembly. If the continuity changes
as the switch is activated, replace
the engine board.