72 TroubleshootingLCD Cannot Be Seen At AllAn Unintended Language Is Displayed on the LCD“The following ink tank cannot berecognized.”U043U140U150z The ink tank is not installed. Install the ink tank.See “Replacing an Ink Tank” on page 46.z The ink tank is not compatible with this machine. (The lamp on the ink tank isoff.)Install an appropriate ink tank.See “Replacing an Ink Tank” on page 46.z An ink tank error has occurred. (The lamp on the ink tank is off.)Replace the ink tank.See “Replacing an Ink Tank” on page 46.“****Printer error has occurred.Turn off power then back on again. Ifproblem persists, see the manual.”Turn off the machine, and unplug the power cord of the machine from the powersupply. After a while, plug the power cord of the machine back in, and then turnon the machine. If the same error occurs, contact a Canon servicerepresentative.“Scanner is not operating correctly.” Turn off the machine, and unplug the power cord of the machine from the powersupply. After a while, plug the power cord of the machine back in, and then turnon the machine. If the same error occurs, contact a Canon servicerepresentative.“The card is currently write-enabled.Set to read-only mode beforeperforming operation.”The Card Slot is set to Read/write mode.You cannot print in this mode. After writing on the memory card, set to Read-only mode again.“An unsupported USB hub isconnected.Remove the hub.”If a PictBridge compliant device is connected via a USB hub, remove the huband connect it directly to the machine.Cause ActionThe machine is not powered on or theLCD is in the screen-saver mode. z If the Power lamp is offThe machine is not powered on. Connect the power cord and press the ON/OFF button. The machine will power on and the LCD will display a message.z If the Power lamp is litThe LCD may be in the screen-saver mode. On the Operation Panel, press abutton other than the ON/OFF button.Cause ActionThe language you want to be displayedis not selected.Select the language you want to be displayed according to the followingprocedure.(1)Press the HOME button. Wait for about 5 seconds, select , and thenpress the OK button.(2)Press the ] button to select , then press the OK button.(3)Press the } button four times, then press the OK button.If the Bluetooth unit is connected to the machine, press the } button fivetimes, and then press the OK button.(4)Use the { or } button to select the language you want to be displayed, thenpress the OK button.Message Action