Modem / Fax Card Service Check - Lexmark X543 Series Service Manual

7525-xxx
3 Check all the connections on the ADF
relay card. Are they properly
connected?
4 Check the ADF cable to ensure it is
properly connected to CN 15 on the
ADF relay card, and main controller
board at JADF1. Is the ADF cable
properly connected?
5 Check the ADF cable for continuity.
Make sure pin22 has continuity. Is
there continuity on pin 22?
6 Replace the ADF. Go to
removal" on page
the situation?

Modem / fax card service check

Step
1 Is the phone line properly connected to the
modem card and the wall jack?
2 Properly connect the phone line to the
modem card and wall jack.
Did this fix the problem?
3 Test the phone line's ability to send and
receive calls.
Did the phone line work properly?
4 Use the MFP on a properly functioning
phone jack.
Did this fix the problem?
5 Is the modem card ribbon cable properly
connected to the system board at JMOD2
and the modem card?
6 Properly connect the modem card cable to
the modem card and system board.
Did this fix the problem?
7 Check the modem card ribbon cable for
continuity. Is there continuity?
8 Check the voltages from connector JMOD2
on the controller board. Check Pin 4 and 5
for +3.3VDC. Pin 7 for +5VDC. 9, 11, 13, 15,
17, and 19 are grounds. Are the signals or
voltages present?
2-70
Service Manual
"Duplex ADF
4-63. Does this fix
Questions / actions
Go to step 4
Go to step 5.
Go to step 6.
Problem solved
Yes
Go to step 2.
Problem resolved.
Go to step 5.
Problem resolved.
Go to step 7.
Problem resolved.
Go to step 8.
Replace the modem card.
See "Modem card
removal" on page 4-46.
Properly connect all the
connections.
Properly connect the ADF cable
to its connections.
Replace the ADF cable.Go to
"ADF cable" on page 4-65
Replace the controller board. Go
to "Controller board removal"
on page 4-16.
No
Go to step 3.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Replace the modem card
cable.
Replace the system board.
See "System board
removal" on page 4-36.