Developing Bias Control Circuit - Canon NP6251 Service Manual

Hide thumbs Also See for NP6251:

Table of Contents

3. Developing Bias Control Circuit

The circuit used to control the developing bias is provided with the following

a. Turning on and off the AC bias

b. Controlling the voltage level of the DC bias

AC Bias OFF control developing bias remote signal ACBTP is '0'

AC bias switch circuit goes OFF.

Drive circuit goes OFF.

AC transformer T401 output is cut off.

The above condition deprives the developing cylinder of AC bias.

The above condition stops the AC bias to the developing cylinder.

AC bias ON control developing bias remote signal ACBTP is '1'

Drive circuit goes ON.

AC bias switch circuit goes ON.

The above condition causes the high-voltage transformer to increase the high-

voltage transformer to 1500 Vp-p and supply it to the developing assembly.

DC controller

Download service manual and resetter printer at http://printer1.blogspot.com

High-voltage transformer (HVT)

AC transformer T401

Figure 4-208

CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 4 IMAGE FORMATION SYSTEM

Voltage detection

DC transformer

Table of Contents