Table 1-10 High-voltage power supply circuits (continued)
Circuit Description
Developing-bias generation The developing bias adheres toner to an electrostatic latent image formed on the
photosensitive drums.
Primary-transfer-bias generation The primary transfer bias transfers the toner from each photosensitive drum onto the
ITB.
Secondary-transfer-bias generation The positive secondary transfer bias transfers the toner image from the ITB onto the
paper. The negative bias transfers residual toner on the secondary transfer roller back to
the ITB. The residual toner on the ITB is deposited in the toner collection unit.
Fuser bias
The printer uses instant-on fusing. The fuser bias is DC positive for improved print quality. The fuser bias
circuit is located in the high-voltage power supply, HVPS (T).
Fuser control
The DC controller and components in the fuser perform the following functions related to fuser operation:
●
Control fuser temperature
●
Detect fuser failures
●
Prevent excessive temperature rise
●
Detect remaining life in the fuser
●
Determine if the correct fuser is installed
Fuser circuits
The fuser heater control circuit and the fuser heater safety circuit control the fuser temperature according to
commands from the DC controller. The fuser consists of the following major components:
22 Chapter 1 Theory of operation ENWW
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