MX-FX11 (serv.man5). Revised December 2010 - Sharp Copying Equipment Service Manual (repair manual). Page 52

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MX-FX11  TROUBLE CODE  3 – 5
When the sub code 2 is "08" or "30" and the communication report is "OK," the report code is "00" or "16."
2. Dial tone
When shipping from the factory, the dial tone detection when sending is set to Enable (changed from OFF to ON). When installing this machine,
be sure to check and confirm that the dial tone is properly detected and the auto dial sending is enabled.
Check to confirm that the continuous buzzer sound is heard when the on-hook key is pressed. (Press the on-hook key again to cancel the
buzzer sound.)
If facsimile communication cannot be executed normally through the IP telephone line, try the general telephone line.
88
The TIFF type of the attached file in received e-mail cannot be recognized.
Data error
E-mail receive
90
In e-mail receive, an attached file cannot be stored in memory. 
Memory over.
Cannot be stored in memory.
E-mail receive
91
In e-mail receive, an attached file cannot be stored in memory.
The file size is too great to be stored in memory.
E-mail receive
92
In SMTP e-mail receive, an attached file cannot be stored in memory.
Cannot be stored in memory.
E-mail receive
Report code 2
Content of communication interruption
Send/Receive
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