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
Summary of Contents for MSYS 5150
Page 9: ...2 6 Samsung Electronics Specification Memo ...
Page 16: ...3 26 Samsung Electronics Setup and Installing Memo ...
Page 37: ...4 2 Samsung Electronics Theory of Operation ...
Page 41: ...4 6 Samsung Electronics Memo Theory of Operation ...
Page 116: ...Samsung Electronics 7 9 Maintenance Troubleshooting No Image ...
Page 117: ...Samsung Electronics Maintenance Troubleshooting 7 10 ...
Page 118: ...Samsung Electronics 7 11 Maintenance Troubleshooting All Black ...
Page 119: ...7 12 Samsung Electronics Maintenance Troubleshooting Vertical White Line Band ...
Page 120: ...Samsung Electronics 7 13 Maintenance Troubleshooting Dark Image ...
Page 121: ...7 14 Samsung Electronics Maintenance Troubleshooting Background ...
Page 122: ...Samsung Electronics 7 15 Maintenance Troubleshooting Ghost ...
Page 123: ...7 16 Samsung Electronics Maintenance Troubleshooting Black Dot ...
Page 124: ...Samsung Electronics 7 17 Maintenance Troubleshooting Horizontal Band ...
Page 125: ...7 18 Samsung Electronics Maintenance Troubleshooting Irregular Density ...
Page 126: ...Samsung Electronics 7 19 Maintenance Troubleshooting White Spot ...
Page 127: ...7 20 Samsung Electronics Maintenance Troubleshooting Trembling at the End When OHP Printing ...
Page 128: ...Samsung Electronics 7 21 Maintenance Troubleshooting Poor Fusing Grade ...
Page 132: ...Samsung Electronics 7 25 Maintenance Troubleshooting No Power LCD NO display LED Off ...
Page 133: ...Fuser Error 7 26 Samsung Electronics Maintenance Troubleshooting ...
Page 134: ...Samsung Electronics 7 27 Maintenance Troubleshooting Paper Jam Mis feeding ...
Page 135: ...7 28 Samsung Electronics Maintenance Troubleshooting Paper Jam Jam1 ...
Page 136: ...Samsung Electronics Maintenance Troubleshooting 7 29 Engine Error ...
Page 137: ...7 30 Samsung Electronics Maintenance Troubleshooting Memo ...
Page 187: ...9 28 Samsung Electronics Electrical Parts List ...
Page 189: ...11 Connection Diagram Samsung Electronics 11 1 ...
Page 190: ...12 1 Main Circuit Diagram Samsung Electronics 12 1 12 Schematic Diagrams ...
Page 191: ...Schematic Diagrams 12 2 Samsung Electronics Main Circuit Diagram ...
Page 192: ...Main Circuit Diagram Samsung Electronics 12 3 Schematic Diagrams ...
Page 193: ...Schematic Diagrams 12 4 Samsung Electronics Main Circuit Diagram ...
Page 194: ...Main Circuit Diagram Samsung Electronics 12 5 Schematic Diagrams ...
Page 195: ...Schematic Diagrams 12 6 Samsung Electronics Main Circuit Diagram ...
Page 196: ...Main Circuit Diagram Samsung Electronics 12 7 Schematic Diagrams ...
Page 200: ...12 3 Sensors Circuit Diagram Samsung Electronics 12 11 Schematic Diagrams ...
Page 201: ...Schematic Diagrams 12 12 Samsung Electronics 12 4 Switch Circuit Diagram ...
Page 202: ...Samsung Electronics 12 13 Schematic Diagrams 12 5 Joint Circuit Diagram ...
Page 204: ...Samsung Electronics 12 15 Schematic Diagrams 12 7 PTL Circuit Diagram ...
Page 205: ...Schematic Diagrams 12 16 Samsung Electronics 12 8 SCAN Circuit Diagram ...
Page 206: ...Samsung Electronics 12 17 Schematic Diagrams 12 9 Engin Circuit Diagram ...
Page 207: ...Schematic Diagrams 12 18 Samsung Electronics Engin Circuit Diagram ...
Page 208: ...Samsung Electronics 12 19 Schematic Diagrams 12 10 LIU Circuit Diagram ...
Page 210: ... Samsung Electronics Co Ltd Mar 1999 Printed in Korea P N JC68 00097A Rev 1 00 ELECTRONICS ...