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Error code: 0x81
Pressure decreasing error.
Pressure mechanism sequence error occurred during pressure operation.
Check the tube path routed between the pressure pump, pressure sensor, IC holder, and ink cartridges for air leak.
Check the pressure sensor/sensor vicinity.
Check pressure pump assembly operation.
Check pressure pump assembly sensor.
Check/replace the following components.
Pressure pump assembly.
Cartridge Sub Unit Holder.
Printer control board.