HP laserjet m712 Guide De Dépannage
The transfer roller cleaning is performed during WAIT period, INTR period, LSTR period and after
forming the image for the front side of page when duplex printing.
Figure 1-23
Transfer roller cleaning
Transfer roller
Photosensitive
drum
Reverse transfer bias
Toner collection box
Cleaning blade
Environment change control
The environment change control calibrates each high-voltage bias to obtain an appropriate image
according to the environment changes.
The DC controller determines the environment, where the product is installed, based on the surrounding
temperature and humidity data from the environment sensor. It adjusts the high-voltage biases to
accommodate environmental changes.
The DC controller determines an environment sensor abnormality and notifies the formatter when it
detects out of specified range data from the environment sensor.
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Chapter 1 Theory of operation
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