ATR Error (E020-XXXX) Display due to Dirt on ATR Sensor Window
Cause
The waste toner may adhere on the ATR sensor window or the sensor shutter. As a result of that, it may be faultily detected as ATR sensor fault and trigger the ATR sensor error (E020-XXXX).

The detail codes (xxxx) are as follow: XXA0, XXA2, XXA8, XXA9, XXC0, XX10, XX11, XXDA.
Filed Measure
Clean the ATR sensor window and the ATR sensor shutter with the following procedure.
1) Remove the ATR sensor from the main body.
2) Press the plunger [1] of the ATR sensor lever solenoid in the direction of the arrow.
3) Clean the ATR sensor window [2] and the ATR sensor shutter [3] with lint-free paper [4].
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Canon CLC 1110 Error Code E020 0173
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