Sharp MX-PNX1A (serv.man12) Service Manual ▷ View online
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.
MX-FNX1/MX-PNX1 ELECTRICAL SECTION 10 – 10
b. Motor drive circuit
1)
1)
Punch horizontal resist motor (FPSM) drive circuit
This circuit controls the punch horizontal resist motor (FPSM) rotation/stop, the rotating direction, and the motor current, and is composed
of the CPU (IC10) on the finisher circuit, the DA converter (IC11), and the constant-current chopper type driver IC (IC2) in the above circuit.
The stepping motor drive excitement pattern signal (YI_MOT_PA, PB, EA, EB) outputted from the CPU (IC10-83, 84, 85, 86pin) is used to
control the motor rotating speed and the rotating direction.
The analog signal (YI_MOT_REF) outputted from the DA converter (IC11-6pin) is divided to a fixed voltage with R17 and R18. This divided
voltage is inputted to IC2-3, 4pin to set the motor current value. The logic of the standby signal (MOT_STY) outputted from the DA con-
verter (IC11-7pin) is H when the motor can be operated.
of the CPU (IC10) on the finisher circuit, the DA converter (IC11), and the constant-current chopper type driver IC (IC2) in the above circuit.
The stepping motor drive excitement pattern signal (YI_MOT_PA, PB, EA, EB) outputted from the CPU (IC10-83, 84, 85, 86pin) is used to
control the motor rotating speed and the rotating direction.
The analog signal (YI_MOT_REF) outputted from the DA converter (IC11-6pin) is divided to a fixed voltage with R17 and R18. This divided
voltage is inputted to IC2-3, 4pin to set the motor current value. The logic of the standby signal (MOT_STY) outputted from the DA con-
verter (IC11-7pin) is H when the motor can be operated.
2)
Punch motor (FPNM) drive circuit
This circuit controls the punch motor (FPNM) rotation/stop, and the rotating direction, and is composed of the CPU (IC10) on the finisher
circuit and the FET (Q1, 2, 3, 4). The CPU (IC10-98,99,100pin) outputs the punch motor (FPNM) drive forward rotation signal, the reverse
rotation signal, and the brake signal to control the DC motor.
circuit and the FET (Q1, 2, 3, 4). The CPU (IC10-98,99,100pin) outputs the punch motor (FPNM) drive forward rotation signal, the reverse
rotation signal, and the brake signal to control the DC motor.
Punch horizontal resist motor
(FPSM)
(FPSM)
Not installed
Punch motor (FPNM)
MX-FNX1/MX-PNX1 ELECTRICAL SECTION 10 – 11
c. Transmission type sensor circuit
1)
1)
LED circuit
This circuit is composed of the paper rear edge sensor
(FPPEND) on the inner punch circuit and the light emitting
(LED) circuit of the paper horizontal resist sensors (FPPD1 –
6) circuit.
Turning ON/OFF of LED1 – 7 are controlled by the paper rear
edge sensor (FPPEND) and the paper horizontal resist sen-
sors (FPPD1 – 6) circuit.
(FPPEND) on the inner punch circuit and the light emitting
(LED) circuit of the paper horizontal resist sensors (FPPD1 –
6) circuit.
Turning ON/OFF of LED1 – 7 are controlled by the paper rear
edge sensor (FPPEND) and the paper horizontal resist sen-
sors (FPPD1 – 6) circuit.
2)
Photo transistor (PTR) circuit
This circuit is the light receiving (PTR) circuit of the paper rear
edge sensor (FPPEND) and the paper horizontal resist sensor
(FPPD1 – 6) circuit on the inner punch circuit. When light is
received from the LED, the collector signal flows through PT1
– 7.
edge sensor (FPPEND) and the paper horizontal resist sensor
(FPPD1 – 6) circuit on the inner punch circuit. When light is
received from the LED, the collector signal flows through PT1
– 7.
MX-FNX1/MX-PNX1 ELECTRICAL SECTION 10 – 12
2. Block diagram
A. MX-FNX1
Main unit
Communi-
cation
circuit
cation
circuit
TCKS
TLLS
TPES
TULS
STHPS
RHDS1
RHDS2
EMPS
JHPS1
JHPS2
ENTS
RUDS
KKBS
JIS
F_SW
DC+24V
DC+5V
Rush current
prevention
circuit
prevention
circuit
Sensor
I/O circuit
I/O circuit
CPU
EE
PROM
Driver
circuit
circuit
Stapler
unit
unit
ST
MOT
J2
MOT
J1
MOT
TRY
MOT
T
MOT
RO
MOT
H
MOT
P_SOL
FAN
BR_SOL
S_SOL
F_SOL
SW
open/close
detection circuit
open/close
detection circuit
5V power
interruption
circuit
interruption
circuit
DC+5V
Inner finisher
Punch unit
PBA -CONT
TxD
RxD
DTR
DSR
RESET
RxD
DTR
DSR
RESET
DC+24
Drawer
connector
connector
DC+5V
DC+24
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