Check to see that nothing is blocking your cartridge assembly from moving laterally. Unplug the A/C cord from your B640 and manually move the cartridge to the center of the rail. Close the front door which houses the cartridge assembly. Plug the A/C cord back into your unit. The unit should reinitialize and after doing so rest the cartridge to the far right end of the rail. This may not fix your problem, but it will confirm whether there is a cartridge transport problem. This is just the beginning in troubleshooting your problem.
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The "Check Printer" error can usually be cleared by unpluging the fax from the wall outlet, waiting a few minutes, and then plugging it back in. If the fax is connected to a UPS, or multioutlet strip, it is highly recommened to plug it directly into the AC wall outlet.
If the message stays in the display, try opening and closing all the access doors to the fax. If that still doesn't return the machine to operating properly, then you will probably need to take it to your service provider.
Fax display screen always reads, "Auto receive". When attempting to
fax, the busy light flashes. Busy light stops flashing for 30 seconds,
then starts flashing again. Above is the default settings for the fax.
NGB0 indicates signal error or line condition error. U need to check the phone line. U can hook any single line phone to the phone line, check for tones without background noise.
I know you said it wasn't unplugged but check the phone line is plugged into the line socket. I don't know how many times I had people who people unknown to them (children, cleaners) have knocked out the line cord and plugged it back in the wrong socket.
Hit the on-hook or hook button and check for dial tone. This will check if the line is still working.
Also the fax will have a mode button. If it has been bumped while moving it could be on manual mode (the machine will not automatically pick up)
The printers memory may be full depending on the type of documents they are printing. The first and most simple step is to unplug the power cord from the back of the unit for 30 seconds, put your finger on the stop key while plugging the unit back up and continue holding the stop key until the time and date are back on the display of the Brother unit.
If that does not work unplug the USB cable from the PC. Unplug the power cord from the unit again. Put your finger on the menu key first and then plug the unit back up. You want to hold the menu key unit the until the LCD says maintanence and all the lights are flashing. Let the menu key go and press the number 82 and will give you an error code. If the error code is 00 then there are no errors. If there is an error code record it and contact brother or check a service manual if you have one. Most laser products all have the same error codes with Brother.
To reset the unit press stop and then 91, this will reset the unit and all faxes or print jobs will be lost. This should clear the issue.
The error keeps flashing and the machine will not work. The error reads, "check cover/cart". We put the cartridge in and out about 10 times and the same error message keeps flashing. the fax machine is still not working. Help!
first clear all files from the memory cards (if there is)
enter "001" and press "set" to delete all files
enter "1" (page 143 )
take the battry out (page 196)
unplug the device for a day and assemble it
hope it works