Controlling The Intensity Of The Scanning Lamp; Outline - Canon NP6251 Service Manual

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CHAPTER 4 IMAGE FORMATION SYSTEM

B. Controlling the Intensity of the Scanning Lamp

Figure 4-105 shows the circuit used to control the intensity of the scanning lamp, and

the circuit has the following functions:

Turning on and off the scanning lamp.

Controlling the intensity of the scanning lamp.

• Keeps the intensity to a specific level in spite of changes in the power supply

• Controls the intensity to suit changes in the sensitivity of the drum.

• Controls the intensity to suit the setting of the Copy Density key.

• Controls the intensity (AE control) to suit the density of the original.

Checking the activation of the scanning lamp.

DC controller PCB

Figure 4-105

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

Lamp activation

Differential

amplification/

phase control

power voltage

Lamp regulator PCB

Power switch

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