Circuit Description
WorkCentre Pro 412
Launch Issue
5-27
August 2001
5-5-3. LSU Circuit
1) Polygon Motor Unit (actuated by +24V)
The polygon motor inside LSU rotates by the ‘PMOTOR’ signal. When it reaches the motor constant
velocity section through the initial transient (transient response) section, it sends the ‘nLREADY’ signal
to the CPU.
The ‘clock’ pin is the pin that receives clock of the required frequency when LSU uses external CLK as
the motor rotational frequency. Currently the external clock circuit is located in the HVPS and 1686Hz =
6.9083MHz (crystal frequency)÷212(74HC4060N IC), is used as the rotational frequency of the poly-
gon motor.
2) Laser Unit (actuated by +5V)
After laser is turned on by ‘nLD_ON’ signal, it is reflected by 6 mirrors (polygon mirror) attached to the
polygon motor and performs scan in horizontal way.When the laser beam hits the corner of the polygon
mirror, it generates ‘nHSYNC’ signal (pulse) and the CPU forms the left margin of the image using this
signal (horizontal synchronous signal).
There are no user-serviceable parts inside the Laser unit.
5-5-4. Fan/Solenoid Actuation Circuit
The fan actuation circuit gets its power using NPN TR. When it receives ‘FAN’ signal from the CPU. The TR
will turn on to make the voltage supplied to the fan to 24V in order to actuate the fan.
The solenoid is actuated in the same way. When it receives control signal from the CPU, the solenoid for
paper feeding is actuated by switching circuit.
D29(1N4003) diode is applied to the both ends of the output terminal to protect Q22(KSC1008-Y) from
noise pulse induced while the solenoid is de-energized.
5-5-5. PTL Actuation Circuit
PTL actuation circuit switches its power using NPN TR.
5-5-6. Motor Actuation Circuit
Motor actuation circuit is determined while selecting the initial driver IC (provided by the vendor). This system
uses TEA3718(U57, U58), A2918(U59)’s motor driver IC. However, the sensing resistance (R273, R274,
R292, R293) and reference resistance (R284, R289, R294, R295) can vary depending on the motor actuation
current value.
It receives motor enable signal (2 phase) from CPU and generates bipolar pulse (constant-current) and
sends its output to stepping motor input.
Содержание WorkCentre Pro 412
Страница 18: ...Introduction WorkCentre Pro 412 August 2001 1 14 Launch Issue This page intentionally blank...
Страница 22: ...Precautions WorkCentre Pro 412 Launch Issue 3 2 August 2001 This page intentionally blank...
Страница 82: ...Disassembly and Reassembly WorkCentre Pro 412 Launch Issue 6 18 August 2001 This page intentionally blank...
Страница 99: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 17 August 2001 No Image...
Страница 100: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 18 August 2001...
Страница 101: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 19 August 2001 All Black...
Страница 102: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 20 August 2001 Vertical White Line Band...
Страница 103: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 21 August 2001 Dark Image...
Страница 104: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 22 August 2001 Background...
Страница 105: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 23 August 2001 Ghost...
Страница 106: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 24 August 2001 Black Dot...
Страница 107: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 25 August 2001 Horizontal Band...
Страница 108: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 26 August 2001 Irregular Density...
Страница 109: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 27 August 2001 White Spot...
Страница 111: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 29 August 2001 Poor Fusing...
Страница 114: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 32 August 2001 No Power No LCD or LEDs...
Страница 115: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 33 August 2001 Fuser Error...
Страница 116: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 34 August 2001 Paper Jam Mis feeding...
Страница 117: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 35 August 2001 Paper Jam Jam 1...
Страница 118: ...Maintenance Troubleshooting WorkCentre Pro 412 Launch Issue 7 36 August 2001 Engine Error...
Страница 122: ...Exploded View Parts List WorkCentre Pro 412 Launch Issue 8 4 August 2001 8 2 Platen Ass y Exploded View Parts List...
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Страница 131: ...Exploded View Parts List WorkCentre Pro 412 Launch Issue 8 13 August 2001 This page intentionally blank...
Страница 150: ...Exploded View Parts List WorkCentre Pro 412 Launch Issue 8 32 August 2001 This page intentionally blank...
Страница 163: ...Block Diagram WorkCentre Pro 412 Launch Issue 10 1 August 2001 10 Block Diagram...
Страница 164: ...Block Daigram WorkCentre Pro 412 Launch Issue 10 2 August 2001 This page intentionally blank...
Страница 165: ...Connection Diagram WorkCentre Pro 412 Launch Issue 11 1 August 2001 11 Connection Diagram...
Страница 166: ...Connection Diagram WorkCentre Pro 412 Launch Issue 11 2 August 2001 This page intentionally blank...
Страница 168: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 2 August 2001 12 2 Main Circuit Diagram 2 of 14...
Страница 169: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 3 August 2001 12 3 Main Circuit Diagram 3 of 14...
Страница 170: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 4 August 2001 12 4 Main Circuit Diagram 4 of 14...
Страница 171: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 5 August 2001 12 5 Main Circuit Diagram 5 of 14...
Страница 172: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 6 August 2001 12 6 Main Circuit Diagram 6 of 14...
Страница 173: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 7 August 2001 12 7 Main Circuit Diagram 7 of 14...
Страница 174: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 8 August 2001 12 8 Main Circuit Diagram 8 of 14...
Страница 175: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 9 August 2001 12 9 Main Circuit diagram 9 of 14...
Страница 176: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 10 August 2001 12 10 Main Circuit Diagram 10 of 14...
Страница 177: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 11 August 2001 12 11 Main Circuit Diagram 11 of 14...
Страница 178: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 12 August 2001 12 12 Main Circuit Diagram 12 of 14...
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Страница 181: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 15 August 2001 12 15 LIU Circuit Diagram...
Страница 182: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 16 August 2001 12 16 OPE Circuit Diagram...
Страница 183: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 17 August 2001 12 17 HVPS Circuit Diagram 1 of 2...
Страница 184: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 18 August 2001 12 18 HVPS Circuit Diagram 2 of 2...
Страница 185: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 19 August 2001 12 19 SMPS 110 Circuit Diagram...
Страница 186: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 20 August 2001 12 20 SMPS 220 Circuit Diagram...
Страница 187: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 21 August 2001 12 21 ADF Circuit Diagram...
Страница 188: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 22 August 2001 12 22 Flat Circuit Diagram...
Страница 189: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 23 August 2001 12 23 PTL Circuit Diagram...
Страница 190: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 24 August 2001 12 24 Sensor Circuit Diagram...
Страница 191: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 25 August 2001 12 25 Toner RX Circuit Diagram...
Страница 192: ...Schematic Diagrams WorkCentre Pro 412 Launch Issue 12 26 August 2001 12 26 Toner TX Circuit Diagram...