Toner Entrance Detection; Toner Sensor Detection Principle; Toner Count Principle - Oki MB461 Maintenance Manual

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2.3 Toner entrance detection

2.3.1 Toner sensor detection principle

Toner low is detected by the toner sensor (reflect sensor) installed in the printer. The light
shield plate is installed in the ID, and its rotation is synchronized with mixing of toner. If the
light shield plate or toner sensor is dirty with toner or something, or the ID unit and the toner
sensor are facing each other at an improper position due to improper setting of the ID unit or
any reasons, toner low cannot be detected correctly, and a toner sensor error occurs.
Toner sensor
44871001TH Rev.6
Light board

2.3.2 Toner count principle

After the image data is transformed into binary data which can be printed by the printer, the
data is counted as print dot number by LSI. The amount of the used toner is calculated from
this count value, and the residual amount is displayed on the menu.
Toner LOW detection (residual amount display on LCD) by the toner sensor is to detect a certain
amount of the reduction of the toner left in ID.
2. DESCRIPTION OF OPERATION
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