Oki MC573 Advanced Manual page 287

Error Description
code
80 A machine (modem) error was detected.
82 Super G3 communication failed.
83 Super G3 communication failed.
84 The communication stopped as the communication
time has elapsed 60 minutes.
90 A wrong prefix number was specified.
*Press [Device Settings], select [Admin Setup] > [User Install] > [Super G3] > [OFF] on the
touch panel.
Solution
Contact your dealer.
Turn off the super G3 mode.(*)
Turn off the super G3 mode.(*)
For transmission, lower the image quality or divide
the documents into several parts and send again.
For reception, contact the other party and have
them lower the image quality or divide the
documents into several parts and resend.
Check the prefix number.
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7. Troubleshooting