Panasonic Panafax UF-4000, Service Manual

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• 2-4. LP Engine Control Block
• High Voltage Development Clock Control
It generates control pulse signals with a High Voltage Supply.
• LSU Control
It generates control pulse signals and control a LSU Scan Motor such as observing abnormal
rotation, etc. It also controls Laser output signals for synchronizing horizontal lines.
• Fuser Control
It controls on/off of Fuser heater with a Low Voltage Power Supply.
• 2-5. PC Interface Block
• IEEE1284
It proceeds handshaking conforms to IEEE1284 requirement and transfers data, such as a
receiving data from PC (Printer Interface) or a transmit scanned data to PC (PC Scanner).
It is complied with Compatibility Mode, Nibble Mode, Byte Mode, ECP Mode.
3. System Memory
This system consists of the following memories.
• F-ROM (IC5)
→
F-ROM (2MB) for programming and data backup.
The program is downloaded from PC via IEEE1284 parallel port.
• S-DRAM (IC6)
→
Work RAM, Page Memory, Line Memory, Image Data Memory, Buffer
(8MB) for transmission and reception.
• F-ROM (IC30)
→
F-ROM (4MB) for image data memory. (UF-4000/4100 only)