Sharp TQ-GX30E Service Manual page 49

2. Check the distance from the fluorescent lamp by using an illuminance meter.
In the proper position for black defect correction, illuminance is between 8,000 and 10,000 lux.
3. Hold the handset in the proper position.
4. Click the "Black defect correction" button.
The following message is displayed.
5. Click the "Yes" button. Communication starts.
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