Machine error 7a on brother mfc8640d

Check there is nothing in the fuser at the back, and that the fuser will turn (CAREFUL it may be hot) Pull the drum and toner unit out, and separate the two components. Check the Developer roller on the front of the toner cartridge turns smoothly and quietly. Any noise is bad. Check the cylinder in the drum unit also turns smoothly. (turn it with the gear, don't put fingers on the cylinder itself). Put it all back together and listen for noise when the machine winds up. a loud ratchety noise usually indicates the gear train is under too much load and is often caused by a strain on the drum rotor.

"Print Unable 0A" indicates that a hardware malfunction has occurred.

- If the error message is "Print Unable ZC", refer to: "Print Unable ZC"

1. Power the machine off by holding down the power button. Wait a few seconds and then power the machine back on.
-If no error message appears on your machine's display, go to Step 2.
- If the error changed to "Self-Diagnostic" on your machine's display, contact brother for warranty service.
-If "Print Unable 0A" returns, contact brother for warranty service.

2. Leave the machine with power ON for 15 minutes.

- If "Self-Diagnostic" or "Print Unable 0A" returns, contact brother for warranty service..

WARRANTY AND SERVICE OPTIONS.

Brother Authorized Service Center locator

Error code 7A
A synchronized signal of the main motor cannot be detected.
Turn the power off and then back on again.
1 Flat cable connection failure of main motor
Check the flat cable connection of the main
motor and reconnect them.
2 Main motor failure Replace the main motor.
3 Low voltage power supply PCB failure
Replace the low voltage power supply PCB ASSY.
4 Main PCB failure Replace the main PCB ASSY.
Replace the main PCB ASSY.

Canon copier IR 2520 show error code of E000002 please help me

Brother printer error code 7a occurs when the main motor fails to synchronize properly with the reference clock.
http://www.fixya.com/support/t5660619-7a_error

Pull the paper tray, likley a small black lever to the left of the roller called the edge actuator is dislodged and hanging down. When in position the actuator should easily push up and appear flat next to the roller.

For the error code "7a" to be fixed permanently, you need to ensure that the main PCB is fine and is working in good condition.
If the error code is caused due to malfunctioning of the main motor, then you need to check the whole setup by connecting it with another motor.
In this case, make sure that there is no mechanical load present on the main board.
While fixing this error code, you will notice that the motor runs slowly initially and then picks up the speed later.
For more information and help........
http://www.fixya.com/support/t5660619-7a_error

sounds like something is broken. best to get it checked out. take to the sewing machine doctor.

your fuser is about to go...
happened to me last week

the doctor blade in the cartridge tobe replaced.