Card Reader Service Check; Cooling Fan Service Check; Cover Interlock Switch Service Check - Dell 3333dn Service Manual

Card reader service check

Note: The card reader cover will need to be removed, and the op panel keyboard assembly will need to be
removed to verify the cable connections. See
FRU
Card reader cable
Card FRU
Controller Board

Cooling fan service check

FRU
Cooling fan

Cover interlock switch service check

Note: Make sure a print cartridge assembly is installed and the cover closes all the way, engaging the cover
open switch lever.
FRU
Cover interlock switch
Action
Verify that the card reader USB cable is properly connected to the card reader card.
Make sure the card reader USB cable plug is properly seated at J2 (controller board).
Try a different USB cable the connects the card reader card to the controller.
reader cable removal" on page 4-7
Replace the card reader FRU. See
the problem, replace the controller board. See
Action
Make sure the fan cable plug is properly seated at J36 (engine board).
Turn the printer on. Within a few seconds, the engine board assembly should apply
+24 V dc to pin 2.
• If voltage is not present, then check or replace the engine board. See
removal" on page 2-15.
• If voltage is present, then check pin 1 for 24 V dc as well. If it is close to 24 V dc while
the fan is still idle, then replace the fan. See
Action
Disconnect the cover interlock cable from the controller board at J11.
With the printer turned off:
1. Verify continuity between cable pin 1 and pin 2 with the door closed and discontinuity
with the door open.
2. Verify continuity between cable pin 1 and pin 3 with the door open and discontinuity with
the door closed.
3. Verify discontinuity between cable pins 2 and 3 whether the door is open or closed.
• If any fail, then replace the cover interlock switch.
• If both pass continuity, then turn the printer on, and measure +5 V dc on pin 2 at J11 on
the controller board.
• Verify pin 3 at J6 is ground.
• If voltage or ground is not present, then see
page 2-36 for more information.
"Card reader cable removal" on page
"Card reader removal" on page
"Controller board removal" on page
"Fan removal" on page
"Engine board service check" on
4-7.
See."Card
4-5. If this does not fix
4-8.
"Engine board
2-24.
2-37
Diagnostics information