Overview

Two methods of toner supply are used with this machine.

• Fixed supply
• PID (with Vtref correction)

SP3400-001 (Toner Supply Method Select) determines which method is used, where the settings are "0" (Fixed Supply) or "1 (Active).

During toner supply control it is very difficult to determine the ideal toner/image density based only on pixel count, because errors tend to accumulate due to changes in ambient temperature and humidity, deterioration of the sensitivity of the drum over time, and variation in development capacity (development gamma).

The "Active" setting (default) is used to control image density.

• ID sensor patterns are projected between pages at regular intervals (one pattern after every 20 pages of A4 LEF, for example).
• The ID sensor can read the reflectivity of the image (affected by how much toner is present), and then the machine uses these readings to adjust toner supply.