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MX-FNX1/MX-PNX1 ELECTRICAL SECTION 10 – 9
5)
Paper rear edge sensor (FPPEND) and paper horizontal resist sensor (FPPD1 – 6)
This circuit is a transmission-type optical sensor circuit using the LED PWB and the photo transistor PWB.
Paper is detected when the light path is interrupted by paper passing between the photo transistor PWB and the LED PWB.
The light emitting circuit of LED1 – 6 is composed of the CPU (IC10) on the inner finisher circuit, the DA converter (IC11), the multiplexer
(IC7) on the above punch PWB, the operation amplifier (IC10, 11), and the transistors (Q7, 9, 10, 11). The analog signal (DA_COM) and
the select signals (A1, B1, C1) are inputted to the multiplexer (IC7-3, 9, 10, 11pin) to select the light emitting circuit. The DA adjustment
value outputted from the multiplexer (IC7-1, 5, 12, 13, 14, 15pin) is used to adjust the current flowing through the LED via the operation
amplifier and the transistor. R30, 3, 42, 43, 44, 45 are the LED current limit resistors.
The light emitting circuit of YK_LED is composed of the CPU (IC10) on the inner finisher circuit, the DA converter (IC11), the operation
amplifier (IC11) on the above punch PWB, and the transistor (Q7). The analog signal (YK_LED_DA : DA adjustment value) adjusts the cur-
rent flowing through the LED via the operation amplifier and the transistor. R63 is the LED current limit resistor.
The light receiving circuit of B5R, 16K-R, A4R, B4R, LTR-Y, A3 is composed of the CPU (IC10) on the inner finisher circuit, the comparator
(IC9), the multiplexer (IC9) on the above punch PWB, and the operation amplifier (IC12, 13).
The select signal (A1, B1, C1) inputted to the multiplexer (IC9-9, 10, 11pin) is used to select the light receiving circuit. The sensor output is
inputted to the multiplexer (IC9-1, 5, 12, 13, 14, 15pin) through the operation amplifier, and the analog signal (AN_COM1) is inputted to the
CPU through the comparator (IC9). R46, 53, 54, 55, 56, and 57 are the load resistors of the photo transistor.
The light receiving circuit of YK_PTR_AN is composed of the CPU (IC10), the comparator (IC9), and the operation amplifier (IC11) on the
above punch PWB. The analog signal (YK_PTR_AN) is inputted from the comparator (IC9) through the operation amplifier (IC11) to the
CPU. R65 is the load resistor of the photo transistor. The logic of the signal inputted to the CPU is L when paper is provided.
The threshold voltage of the comparator on the inner finisher circuit is 5V divided with R100 and R101.
This circuit is a transmission-type optical sensor circuit using the LED PWB and the photo transistor PWB.
Paper is detected when the light path is interrupted by paper passing between the photo transistor PWB and the LED PWB.
The light emitting circuit of LED1 – 6 is composed of the CPU (IC10) on the inner finisher circuit, the DA converter (IC11), the multiplexer
(IC7) on the above punch PWB, the operation amplifier (IC10, 11), and the transistors (Q7, 9, 10, 11). The analog signal (DA_COM) and
the select signals (A1, B1, C1) are inputted to the multiplexer (IC7-3, 9, 10, 11pin) to select the light emitting circuit. The DA adjustment
value outputted from the multiplexer (IC7-1, 5, 12, 13, 14, 15pin) is used to adjust the current flowing through the LED via the operation
amplifier and the transistor. R30, 3, 42, 43, 44, 45 are the LED current limit resistors.
The light emitting circuit of YK_LED is composed of the CPU (IC10) on the inner finisher circuit, the DA converter (IC11), the operation
amplifier (IC11) on the above punch PWB, and the transistor (Q7). The analog signal (YK_LED_DA : DA adjustment value) adjusts the cur-
rent flowing through the LED via the operation amplifier and the transistor. R63 is the LED current limit resistor.
The light receiving circuit of B5R, 16K-R, A4R, B4R, LTR-Y, A3 is composed of the CPU (IC10) on the inner finisher circuit, the comparator
(IC9), the multiplexer (IC9) on the above punch PWB, and the operation amplifier (IC12, 13).
The select signal (A1, B1, C1) inputted to the multiplexer (IC9-9, 10, 11pin) is used to select the light receiving circuit. The sensor output is
inputted to the multiplexer (IC9-1, 5, 12, 13, 14, 15pin) through the operation amplifier, and the analog signal (AN_COM1) is inputted to the
CPU through the comparator (IC9). R46, 53, 54, 55, 56, and 57 are the load resistors of the photo transistor.
The light receiving circuit of YK_PTR_AN is composed of the CPU (IC10), the comparator (IC9), and the operation amplifier (IC11) on the
above punch PWB. The analog signal (YK_PTR_AN) is inputted from the comparator (IC9) through the operation amplifier (IC11) to the
CPU. R65 is the load resistor of the photo transistor. The logic of the signal inputted to the CPU is L when paper is provided.
The threshold voltage of the comparator on the inner finisher circuit is 5V divided with R100 and R101.
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