Image Formation System; High-Voltage Transformer Circuit - Canon GP200 Service Manual

3. OPERATIONS AND TIMING
V. IMAGE FORMATION SYSTEM
A. High-Voltage Transformer Circuit
The high-voltage circuit associated with the formation of images is built as part of the composite power
supply PCB and is used for the following:
• Controlling the primary charging
• Controlling transfer charging
• Controlling the current for the separation static eliminator to a specific level
• Controlling the developing bias DC component
• Turning ON and OFF the developing bias AD component
• Applying a transfer guide bias
• Turning ON and OFF the fixing bias
In addition to the high-voltage transformer circuit, the composite power supply PCB is equipped with
lamp regulator and power supply circuit functions. The discussions here are limited to the high-voltage
transformer circuit. (For general descriptions of the composite power supply PCB as a whole, see "Power
Supply.")
Primary charging roller
Lower fixing
roller
3–58
COPYRIGHT © 1996 CANON INC.
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Developing assembly
Drum
Transfer guide
Transfer roller
Static
eliminator
Figure 3-501
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
Composite power supply PCB
J205-3
J205-3
HVT circuit
J206-1
T502
J206-4
J220