Lexmark MX910de Service Manual page 188

Action
Step 18
a
Upgrade the firmware if it was not upgraded in a previous step.
Note: Contact your next level of support for the correct firmware
level to use.
b
Reset the printer.
c
Send the printer a print job.
Does the error remain?
Step 19
a
Replace the modem.
b
Reset the printer.
Does the error remain?
Step 20
Run a fax job.
Does the error remain?
Step 21
Is there an ISP option installed?
Step 22
a
Reinstall the first ISP option.
b
Reset the printer.
Does the error remain?
Step 23
Run a job to test the option.
Does the error remain?
Step 24
a
Upgrade the firmware if it was not upgraded in a previous step.
Note: Contact your next level of support for the correct firmware
level to use.
b
Reset the printer.
c
Send the printer a print job.
Does the error remain?
Step 25
a
Replace the faulty ISP option.
b
Reset the printer.
Does the error remain?
Yes
Go to step 19.
Go to step 31.
Go to step 31.
Go to step 22.
Go to step 24.
Go to step 24.
Go to step 25.
Go to step 31.
Diagnostic information
188
7421
No
The problem is solved.
The problem is solved.
Go to step 21.
The problem is solved.
Go to step 23.
Go to step 26.
The problem is solved.
Go to step 26.