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The reader controller PCB detects communication error between the main
controller PCB and the reader controller PCB.
Disconnect and then connect the reader communication cable
connector, Replace the reader controller PCB, Replace the main
communication error between main pcb and user interface.check blue loom (5 blue wires) from main board to user interface for bad connections.normally loose where they connect to the user interface (control panel buttons)
The error message 36 may happen to come in your Brother printer due to some physical damages. Thus, you can solve the issue by replacing these damaged parts of the printer. You need to replace the maintenance unit with a new one. It is good to upgrade the carriage PCB, head or carriage unit and carriage motor, if these are causing the issue. The main PCB of the printer may also get the issue and you need to replace the main PCB. You may also need to replace the power supply PCB if it is damaged.
According to Pioneer there are 2 possible faults associated with this error.
Option 1 - Error in mechanical operations Unrecoverable: Turn the power off. The error indication will be cleared. If the error still shows then it's Option 2.
Option 2 - Communication error between operating section and main section The error indication is cleared when the communication is finished (if it can finish).
Communication fault between the control interface (the PCB with all the switches on) and the main PCB (the motherboard in the base of the unit). It could be that the main ribbon cable that connects between the two has come loose or damaged. The control interface works on a digital PCM system, and if there is a problem with this, the motherboard throws a fit.
This error code is a communication error between the Reader Unit and the Copier (Printer Unit). Shut down and un-plug the Copier. Unplug and reset all the connectors on the rear and sides of the copier. One interface cable is responsible for communication between the reader unit and printer unit. This may solve the problem. Possible the cable is defective see if cable or cable socket is damaged.
This error also can be caused by a defective reader controller/DC Controller or Main Controller PCB.
If the simple cable check does not solve the problem a service call by a Canon dealer will required.
E90 means Communication error between user interface and main board. Verify the connector between the main board and user interface board by plugging and unplugging the connector few times on both sides... if still the same fault then main pcb board is replaced 1st tried then the user control pcb is still the same...
E90 is a communication error between the main pcb and the display pcb.Check the blue wiring loom that goes from the main pcb to the display pcb.normally it is a bad/loose connection on the display pcb end.clean pcb tracks and tighten the blue connector loom pins up and hopefully it will work.if it doesn't solve the problem then you could have a faulty display pcb or main pcb.