Modem / Fax Card Service Check - Lexmark X543 Service Manual

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?
Questions / actions 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 fax card. See
"Fax card removal" on
page 4-102.
7525-xxx
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 controller
board. See "Controller
board removal" on
page 4-18.
2-71
Diagnostic information