| Revision A |
MP Cassette Set Sensor (PC6)
This sensor detects the installation of the MP cassette. This sensor uses a photointerrupter. When the signal is input to the CPU in the control circuit, the CPU detects that the MP Cassette has been installed.
If the MP cassette is not installed in the MP Tray:
The projection of the paper cassette comes off the sensor which is mounted on the printer. In this case, the light emitted from the LED of the photointerrupter reaches the phototransistor of the photointerrupter and the phototransistor turns ON. Accordingly, the output of the phototransistor, i.e., the output of the sensor is
“L”.
When the MP cassette is installed in the MP Tray:
The projection of the paper cassette engages with the sensor. In this case, the light emitted from the LED is blocked by the projecting and it does not reach the phototransistor. As a result, the phototransistor turns OFF and its output is “H”.
MP Cassette Set Sensor (PC6)
MP Cassette
Light passes: | Light is blocked: | |
Output = L | ||
Output = H | ||
[Cassette is not installed.] | [Cassette is installed.] | |
Note: PC6 is mounted on the Printer. |
|
Figure 2-5. MP Cassette Set Sensor Mechanism
MP Cassette Paper Empty Sensor (PC4)
This sensor detects the paper empty status of the MP cassette. The sensor uses a photointerrupter. When paper runs out in the MP cassette, paper empty occurs.
When paper is present in the paper cassette, the lower part of the sensor arm is pressed by the paper and the projection of the upper part of the sensor arm comes off the photointerrupter. Thus, the light from the LED of the photointerrupter passes in the photointerrupter and the photointerrupter turns ON. As a result, the output of the photointerrupter is “L”.
When paper runs out in the paper cassette, the lower part of the sensor arm lowers with its weight so that the projection of the sensor arm engages with the photointerrupter. As a result, the output of the photointerrupter is “H”.
MP Cassette Paper Empty Sensor (PC4)
Paper
Light passes: | Light is blocked: |
Output = L | Output = H |
[Paper is present.] | [Paper is Out] |
Figure 2-6. MP Cassette Empty Sensor Mechanism
Operating Principles | Printer Mechanism Operating Principles | 57 |
