5-32
Samsung Electronics
Circuit Description
5-7 H.V.P.S. (High Voltage Power Supply)
5-7-1 Output Specifications
5-7-2 Transfer High Voltage(THV)
THV output is a series circuit of positive and negative voltage generation part. Negative output is for cleaning
the OPC Drum and positive output is for drawing the Toner on the paper. High voltage is generated by DC-
DC Converter that is composed of a PWM Control Circuit, a Blocking Oscillator and 4 times voltage rectifying
circuit. the “THV-EA” goes to “low” positive and negative parts operate. And this state, THV positive output is
controlled by “THV-PWM” duty cycle, when it goes to “High”, positive part outputs 0V, and negative part only
output -1000V. When some duty cycle is applied to the PWM input of H.V. circuit, THV terminal outputs
positive voltage.
5-7-3 Main and Bias High Voltage(MHV,SUPPLY,DEV)
MHV generation part is composed of blocking oscillator and double voltage rectifying circuit. When “MHV-
EA” signal goes to “High”, the MHV outputs, and this state, when “SUPPLY-EA” or “DEV-EA” input goes to
“Low”, SUPPLY or DEV terminal corresponding it outputs the voltage that is generated by dropping MHV.
DEV output voltage is selectable 300V or 350V.
Item
Printing/Initial
DCU On
Supply Voltage
-500V
-500V
Bias Voltage
-300V
-300V
THV(Transfer High Voltage) (-)
-1KV
-1KV
THV(Transfer High Voltage) (+)
MHV(Main High Voltage)
-1.4KV
-1.4KV
Содержание MSYS 5150
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Страница 203: ...Schematic Diagrams 12 14 Samsung Electronics 12 6 OPE Circuit Diagram IF Active HIGH Logic IF Active LOW Logic ...
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Страница 210: ... Samsung Electronics Co Ltd Mar 1999 Printed in Korea P N JC68 00097A Rev 1 00 ELECTRONICS ...