M126/M127/M128  6-44  SM 
6.4.5  FAX ERROR CODES 
Fax error log codes 
 
Error code  Description  Action 
000 
No error occurred during fax 
transmission 
No action needed 
200 
Error occurred when transmitting 
training. 
  Check line quality. 
  Select a lower ‘Max Speed’. 
  value under Fax Send 
settings 
  Adjust the transmit level. 
3XX 
Error occurred when receiving 
image data. 
  Check line quality. 
  Adjust ‘Receive Threshold’. 
  Select a lower ‘Max Speed’ 
value under Fax Receive 
settings. 
4XX 
Error occurred when sending image 
data. 
  Check line quality. 
  Adjust ‘Transmit Level’. 
  Select a lower ‘Max Speed’ 
value under Fax Receive 
settings. 
5XX 
Received unknown response from 
remote fax device. 
No action needed. Issue is with 
the other device. 
6XX 
Error occurred when receiving a 
frame. 
  Check line quality. 
  Adjust ‘Receive Threshold’. 
7XX 
Error occurred when sending a 
frame. 
  Check line quality. 
  Adjust ‘Transmit Level’. 
  Select a lower ‘Max Speed’ 
value under Fax Send 
settings. 
800 
Received EOT unexpectedly from 
the modem in V34 mode. 
  If error persists disable V34 
modulation scheme.