Ricoh 002052MIU User Guide - Page 138

FLASH MEMORY, 4.3 SDRAM, 4.4 SENSOR INPUT CIRCUIT, Paper Empty Sensor, MP Sensing

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MAIN BOARD 6.4.2 FLASH MEMORY It keeps the system program and downloads the system program through the PC interface. • Capacity: 0.5 M Byte • Access Time: 70 nsec 6.4.3 SDRAM Used as a buffer, system memory area at the time the machine prints. 6.4.4 SENSOR INPUT CIRCUIT Paper Empty Sensor: The paper empty sensor (Photo Interrupter) on the engine board lets the CPU know if the tray has paper. If the paper tray is empty when it reads the D0 Bit of CPU, it sets the second LED (yellow) on the panel. MP Sensing: The MP Sensor (Photo Interrupter) uses an actuator to let the CPU know if paper is in the manual paper (MP) tray. Paper Feed and Toner Cartridge Sensor: When paper passes the actuator (feed sensor part), it detects the photo interrupter signal. Then lets the CPU know the paper feed condition. Then it sends image data. If it doesn't detect the feed sensor in 1 sec. after paper is fed, Jam 0 is shown (Red and yellow LED's will be set on). The machine checks if the cartridge is installed. The actuator operates after the cartridge is attached. The signal from the photo interrupter is detected when it passes the actuator of the sensor part. This is the developer ID sensing procedure. Paper Exit Sensor: Checks if paper had exited from the machine. The exit sensor on the engine board and actuator on the frame are used for this process. Paper detects the on/off time of exit sensor. Then either a correct operation or a jam information is sent to the CPU. B173 6-8 SM

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MAIN BOARD
B173
6-8
SM
6.4.2 FLASH MEMORY
It keeps the system program and downloads the system program through the PC
interface.
•
Capacity: 0.5 M Byte
•
Access Time: 70 nsec
6.4.3 SDRAM
Used as a buffer, system memory area at the time the machine prints.
6.4.4 SENSOR INPUT CIRCUIT
Paper Empty Sensor:
The paper empty sensor (Photo Interrupter) on the engine board lets the CPU
know if the tray has paper. If the paper tray is empty when it reads the D0 Bit of
CPU, it sets the second LED (yellow) on the panel.
MP Sensing:
The MP Sensor (Photo Interrupter) uses an actuator to let the CPU know if paper is
in the manual paper (MP) tray.
Paper Feed and Toner Cartridge Sensor:
When paper passes the actuator (feed sensor part), it detects the photo interrupter
signal. Then lets the CPU know the paper feed condition. Then it sends image
data. If it doesn’t detect the feed sensor in 1 sec. after paper is fed, Jam 0 is shown
(Red and yellow LED³s will be set on). The machine checks if the cartridge is
installed. The actuator operates after the cartridge is attached. The signal from the
photo interrupter is detected when it passes the actuator of the sensor part. This is
the developer ID sensing procedure.
Paper Exit Sensor:
Checks if paper had exited from the machine. The exit sensor on the engine board
and actuator on the frame are used for this process. Paper detects the on/off time
of exit sensor. Then either a correct operation or a jam information is sent to the
CPU.