1-24 Service Manual
4025-XXX
39. No Paper Sensor 2
Monitors the paper level in Feeder 2. Functions identical to No Paper Sensor 1.
40. Level 2 Sensor
Monitors whether or not Tray 2 is installed.
41. Size Sensor 2
Monitors the size of the paper that is loaded in Feeder 2.
42. Take Away Roll Sensor 2
Monitors the paper travel at the Take Away Roll 2.
43. Lift Motor 2
Raises the paper tray in Feeder 2.
44. Left Cover Interlock 2
Monitors the Left Cover Interlock Switch on Feeder 2.
Control Functions of the Machine Control Unit (MCU)
1. Input from sensors
Sensors tell the MCU what is going on within the printer and what is happening to
the sheet of paper during a print cycle.
Example:
Printer sensors send their current status to the I/O PWB, which transfers the data on
to the MCU PWB. The sensor status signals tell the MCU whether they are actuated
or not actuated (on or off, high or low). If measured with a voltmeter, some sensor
signals to the MCU would be +5VDC when on and 0VDC when off, while other
sensors may be 0VDC when on and +5VDC when off. In some cases, signal names
may indicate what reading you should get when the signal is on. For example, the
signal name PRINTHEAD MOTOR ON (L) 5VDC means when the Printhead Motor
signal is on, the reading goes low (0VDC), and when the Printhead Motor signal is
off, the reading goes high (5VDC).
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