Table of Contents
Advertisement
20 July 2005
6.4.4 SENSOR INPUT CIRCUIT
Paper Empty Sensor
The CPU monitors the paper empty sensor (photo interrupter). The printer flashes
the red ERROR LED when the paper feed unit is empty.
By-pass Tray Sensor
Paper in the by-pass tray gets detected by the by-pass sensor (photo interrupter)
on the frame. The CPU monitors this sensor to detect if paper is in the by-pass
tray. Paper gets fed from if the CPU detects paper is present.
Paper Feeding
Paper gets detected by the photo interrupter when it passes the actuator on the
feed sensor. This CPU monitors the signal and makes the image after a certain
time. Jam0 shows (red ERROR LED) if the feed sensor is not detected within 1
second after paper gets fed.
Paper Exit Sensor
The exit sensor on the engine board, and actuator on the frame detect when paper
exits from the machine. The CPU detects the on/off time of the exit sensor and
reports normal operation or jam status. The red ERROR LED lights if Jam 2 error
occurs.
Cover Open Sensor
The cover open sensor is located on the power supply board and is operated by a
molded tab on the front cover. Power (+24V and +5V ) to the following gets cut
when the front cover is open.
• DC fan
• Solenoid
• Main motor
• Polygon motor
• HVPS and LSU
DC Fan/Solenoid Driving Circuit
The CPU uses a transistor to control the fan driving circuit. It is automatically
turned off when a machine enters energy saver mode.
Two solenoids are driven by signals from the CPU (by-pass and paper pick-up).
6-15
ASIC(SPGP)
Advertisement
Table of Contents
