Lexmark X500n Service Manual - Page 81

Modem / fax card service check

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7100-XXX Modem / fax card service check Step 1 2 3 4 Questions / actions Is the phone line properly connected to the modem card and the wall jack? Yes Go to step 2. Is the modem card cable properly connected to the system board at J-FAX-1 and the modem card? Go to step 3. Check the modem card cable for continuity. Is there continuity? Check the voltages from connector JFAX1on the RIP card. Check pins 1 and 2 for +3.3V. Pins 24, 27 and 28 are grounds. Are there signals or voltages present? Go to step 4. Replace the modem card. See "Modem card removal" on page 4-45. No Properly connect the phone line to the modem card and wall jack. Properly connect the modem card cable to the modem card and system board. Replace the modem card cable. Replace the system board. See "System board removal" on page 4-36. Diagnostic information 2-43

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Diagnostic information
2-43
7100-XXX
Modem / fax card service check
Step
Questions / actions
Yes
No
1
Is the phone line properly connected to the
modem card and the wall jack?
Go to step 2.
Properly connect the phone
line to the modem card and
wall jack.
2
Is the modem card cable properly
connected to the system board at J-FAX-1
and the modem card?
Go to step 3.
Properly connect the
modem card cable to the
modem card and system
board.
3
Check the modem card cable for continuity.
Is there continuity?
Go to step 4.
Replace the modem card
cable.
4
Check the voltages from connector J-
FAX1on the RIP card. Check pins 1 and 2
for +3.3V. Pins 24, 27 and 28 are grounds.
Are there signals or voltages present?
Replace the modem card.
See
“Modem card
removal” on page 4-45
.
Replace the system board.
See
“System board
removal” on page 4-36
.