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2-80 Service Manual
Cover closed switch/cable service check
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 “High-capacity feeder input tray service check” on page 2-95. If the
base printer continues to not operate correctly, remove any other 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 “Handling ESD-sensitive parts” on page 4-1.
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 Action
1 Toner cartridge Make sure the toner cartridge is correctly installed and that the right
and left cartridge tracks are not loose or broken. Make sure the cover
closed switch activation tab on the toner cartridge is not broken and
that the tab correctly activates the cover closed switch spring.
2
Cover closed switch/cable
assembly
Check the cover closed switch for proper mechanical operation. If
incorrect, repair as necessary. Disconnect the cover closed switch
cable from J8 at the system board and measure the voltage at J8-3. It
measures approximately +5 V dc. If the voltage is incorrect, replace
the system board. If the voltage is correct, check the voltage at J8-1.
If the voltage measures greater than +1.0 V dc, replace the system
board. If the voltage is correct, check the continuity between J8-1 and
J8-3 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 system
board.
Cover closed switch table
J8 Switch status
Pin number Cover open Cover closed
Pin 1-3 Open Closed
Pin 1-2 Closed Open
FRU Action
1 Line voltage Check the AC line voltage. If the line voltage is incorrect, inform the
customer.
2
AC line cord 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.