G. Electrical section
(1) Block diagram
ICU PWB
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| ASIC |
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| I/F |
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| MCU (PCU) PWB |
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CCD PWB |
| Image process ASIC |
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CCD |
| CCD control |
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| DRAM | LSU unit | |
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| Image |
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| Data select |
| Laser |
Amplifier | A/D |
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process |
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| High voltage |
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| Paper in sensor | PWB |
| SRAM | SRAM | DRAM | DRAM | DRAM |
| Paper exit |
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| 32kX8 | 32kX8 | 16Mbit | 16Mbit | 16Mbit |
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Scanner motor | Motor driver |
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| CPU | Driver | Pickup solenoid | |
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| H8S |
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FAN motor |
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| Motor driver | Main motor |
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Home position sensor |
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Operation panel PWB |
| ROM |
| RAM | EEPROM |
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Key switch |
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Display lamp |
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Paper size sensor
Laser beam
sensor
Polygon motor
Toner sensor
Scanner |
| Invertor |
lamp |
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Power PWB unit
Temperature
fuse
Power SW
Heat roller
Thermistor
Heater lamp
Temperature
fuse
Developer cartridge
Doctor
Developing
roller
Earth sheet
Main charger roller
Drum
OPC cartridge
Control
electrode
Transfer roller
a. Major sections operations and functions
MCU (PCU) PWB
The CPU controls the engine, and the ASIC performs image process. Image data (analog signals) from the scanner (reading) section are converted into digital signals by the A/D convertor and image process (area separation, filter process, gamma correction, resolution conver- sion, zooming) is performed by the ASIC and the line memory (SRAM). The processed data are outputted to the scanner (writing) section.
During printing, the dot image data from the ICU PWB are received and outputted to the scanner (writing) section straightly. The CPU controls the machine operations according to the key operation sig- nals from the operation PWB. The loads (motor, lamp. solenoid, high voltage power PWB, etc.) are controlled according to the sensors and detectors signals. At the same time, the machine status data are outputted to the operation section and the ICU PWB.
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