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Chapter 2
2-20
F-2-21
2.7.2 Engine Controller
2.7.2.1 Outline
0008-0558
The engine controller circuit is used to control the sequence of operation of the machine, and it operates under the control of the CPU found in the engine
controller.
When the machine is turned on and the power supply supplies the engine controller with DC power, the CPU starts to control the operation of the printer.
When the machine is in a standby state, the CPU then drives the various loads (e.g., laser diode, motor, solenoid) according to the print command coming
from the video controller.
The following is a block diagram of the circuit:
F-2-22
*
CPU (IC902)
The CPU is a 8-bit single-chip microprocessor IC. The CPU is equipped with both ROM and RAM, and it performs the following as instructed by the
control program stored in the ROM:
1. sequential control of the printer.
2. communicates with the interface controller.
3. controls the power supply circuit.
4. controls the laser/scanner.
5. controls sensors.
6. controls loads (motor, solenoid)
7. detects the presence/absence of a cartridge
IC2
IC3
IC1
J2
SW1
J1
IC4
J3
J4
1
1
2
4
1
1
5
14
Engine controller PCB
Video
Controller
PCB
IC902
CPU
Power supply
PCB
Sensors
Main motor
Scanner motor
BD circuit
Laser driver
Pick-up
solenoid
Summary of Contents for LBP-3000
Page 1: ...H T T P W W W F I X C L U B C O M C N Mar 10 2005 Service Manual LBP3000 2900 Series LBP2900 ...
Page 2: ...H T T P W W W F I X C L U B C O M C N ...
Page 6: ...H T T P W W W F I X C L U B C O M C N ...
Page 12: ...H T T P W W W F I X C L U B C O M C N Contents ...
Page 13: ...H T T P W W W F I X C L U B C O M C N Chapter 1 PRODUCT DESCRIPTION ...
Page 14: ...H T T P W W W F I X C L U B C O M C N ...
Page 16: ...H T T P W W W F I X C L U B C O M C N ...
Page 23: ...H T T P W W W F I X C L U B C O M C N Chapter 2 TECHNICAL REFERENCE ...
Page 24: ...H T T P W W W F I X C L U B C O M C N ...
Page 44: ...H T T P W W W F I X C L U B C O M C N Chapter 2 2 18 ...
Page 51: ...H T T P W W W F I X C L U B C O M C N Chapter 3 DISASSEMBLY AND ASSEMBLY ...
Page 52: ...H T T P W W W F I X C L U B C O M C N ...
Page 87: ...H T T P W W W F I X C L U B C O M C N Chapter 3 3 33 F 3 161 ...
Page 88: ...H T T P W W W F I X C L U B C O M C N ...
Page 89: ...H T T P W W W F I X C L U B C O M C N Chapter 4 MAINTENANCE AND INSPECTION ...
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Page 98: ...H T T P W W W F I X C L U B C O M C N ...
Page 99: ...H T T P W W W F I X C L U B C O M C N Chapter 5 TROUBLESHOOTING ...
Page 100: ...H T T P W W W F I X C L U B C O M C N ...
Page 102: ...H T T P W W W F I X C L U B C O M C N ...
Page 107: ...H T T P W W W F I X C L U B C O M C N Chapter 6 APPENDIX ...
Page 108: ...H T T P W W W F I X C L U B C O M C N ...
Page 110: ...H T T P W W W F I X C L U B C O M C N ...
Page 117: ...H T T P W W W F I X C L U B C O M C N Mar 10 2005 ...