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There are two possible reasons why your printer display the error message.
1. Poor Line Condition - electrical interference on the line -Make sure electrical or electronic appliances do not interfere with the printer's phone line - poor line connection - If you have a phone try connecting it directly to line outlet. Listen to the dial tone, if you hear noisy and static, then you will need to call your local telephone company cause there is a problem in your phone line. If dial tone is clear and stable then try checking the telephone line cord that you use to connect your printer from the line outlet, replace if broken. - alarm system
or another device on same line, these interferes with transmission / reception of the fax machine. Try connecting the printer all alone and then try sending a fax.
2. Memory Full - There is no space to store incoming fax messages. Delete all stored fax messages.
Poor Line Connection indicates an issue with your telephone line (Page 136). If you are sharing the fax line with any splitters or computers, try connecting the MFC-490CW directly to the phone jack and send a fax. If you are still getting a Poor Line Connection error message, call the telephone company and have a repair technician check your telephone line.
Out of Memory error message means the machine's memory is full (Page 138).
Try pressing Stop/Exit and wait until all current operations finish and try again.
Try clearing the data in memory. To gain extra memory space. turn off Memory Receive (See Page 48).
Try printing the faxes that are in memory (See Page 49).
System Busy error message wasn't in the manual, but I suspect it means there's a current operation in progress and the machine needs time to finish before moving on to another job. Just wait for the current job to finish, then try again.
Make sure by making a copy that your scanner is OK, streaks or black bands won't send properly and you need a new scan assembly, Poor line condition is just that, you need a better line or cable, If you go to fax settings and turn off error correction mode it sometimes helps as well.
Depending on your location the line coulod well be poor quality for a sensitive fax. Any spurious sounds on a fax line will cause it to fault. May I suggest you try the fax on the mainline first before assuming the unit is at fault.
Length of line from point a to b can also reduce the efficiency of signal. It may sound ok to the ear, but resistance may be the factor in reducing the level of the tone that the fax requires to hear and then activate send or receive.It reports poor line condition and even poor memory because it keeps loading to send.
If it does it on the mainline as well then I would be considering a technical call for help. There may be a fault in the unit.
Plug a phone into the line and listen for static. Too many phones on the line, bad lines,etc, can cause a poor line condition. Try the unit directly into the phone line, no answer machine or anything else on the line. Maybe the memory thing is it has a lot of faxes that it hasn't been able to send.