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I've never seen a message like that with the 0390H code. There is no mention of that code in either the user manual or service manual. The closest thing is the sc390 code, which means either the toner density sensor or the developer has gone bad, and typically replacing the PCU can fix that problem.
If the new PCU doesn't fix the problem, you might want to try calling Ricoh for support, since their documentation doesn't mention that code.
this is just the transition speed and line condition and you dont have to worry about it , the machine will give you an error code if the faxes dont go through alturnativly contact the reciever of the fax to check that they have recieved it
Hi Alexandra, I hate to be the messenger of bad news but Machine Error 7C mean Engine PCB Error. This error code is for servicer reference and may not appear on the service manual. If it does, it will tell you to unplug the unit and try again. If the problem persists, you have to bring it to an Authorized Brother Service center for repair.
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.