hello I have the same problem with a canon irac5235, perform dirt cleaning between the touch panel and the control panel cover, check panel pcb connector and main controller. Press the switch test button on the back of the machine off and on. the printer was turned on again and the control panel worked well, the next day the control panel presented the same problem. when I press the switch test button on the back again, the printer control panel works fine. Is it necessary to change PCB assembly is FM4-9880-000 or update the firmware ?. I don't have the firmware to be able to perform the update
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