Sharp AR-CF2 service manual Reset Circuit Eeprom Circuit

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(4) Flapper Solenoid and Registration Clutch Drive Circuit (F_SOL and R_CL)

Flapper SOL

Registration CL

This circuit controls the flapper solenoid operation and the registration clutch engagement.

When the signal F_SOL is "H", Q2 turns on to activate the solenoid. Similarly, when the signal R_CL is "H", Q3 turns on to engage the clutch.

The flapper solenoid drive signal is the PWM signal. At the beginning of the solenoid activation, the signal is adjusted to set the solenoid at 100% duty cycle. After the plunger of the solenoid is pulled in, the sig- nal is adjusted to set the solenoid at 70% duty cycle in order to reduce the temperature rise with the plunger hold.

(5) Reset Circuit

(6) EEPROM Circuit

Not Mounted

The circuit transmits a reset signal to the CPU when the power is turned on or a power brownout is detected.

The circuit includes a watchdog timer intended to the CPU system operation diagnosis.

After the power is turned on, normally IC3-Pin8 (*RES) is "H". How- ever, when the +5V voltage falls to 4.2V or less because of the power turned off or any trouble, IC3-Pin8 turns "L" to reset the CPU.

The clock signal from the CPU is transmitted to IC3-Pin3 (CK) at a reg- ular interval to clear the watchdog timer embedded in IC3. However, if the clock signal from the CPU disappears because of a system trouble, IC3-Pin8 turns "L" to reset the CPU and stop the system operation.

This circuit consists of the data storage EEPROM and the peripheral circuits.

IC4 is a storage memory for the adjustment settings of the reverse sen- sor (reflective sensor) and the paper width detection potentiometer, and passes the data to the CPU through the four-wire serial interface.

Once data is stored, the data is retained and not cleared even if the power is turned off.

IC4-Pin1 (CS) is the chip selection terminal, and stays "H" during pass- ing data.

IC4-Pin2 (SK) is the serial clock terminal. The serial data is transmitted synchronizing with the clock signal input to the terminal

IC4-Pin3 (DI) is the serial data input terminal. IC4-Pin4 (DO) is the serial data output terminal.

AR-CF2 ELECTRICAL SECTION 9 - 7

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Contents Sharp Corporation Product Outline SpecificationsExternal Views and Internal Structures Sensors and switchesExternal components AR-CF2 External Views and Internal Structures 3Motors, solenoid, and clutch Structure Operational DescriptionFunction outline Operational descriptionNormal paper feed operation of inserter online/ offline Entering reverse section Reverse paper feeding operation of inserterHow to set punching mode Offline mode settingHow to set stapling mode Exiting from reverse sectionLED indication on operator panel Start LED Mode LEDLED LED1 LED2 LED3 LED4 Error detection Paper jam/error detectionAlarm detection List of Paper jamsPaper width detection level setting adjustment AdjustmentsAR-CF2 Adjustments 5 LEDAR-CF2 Disassembly and Assembly 6 Disassembly and AssemblyPaper Feed Separation Unit Pickup Roller & Paper Feed RollerHorizontal Pass Roller 1 and Registration Roller Paper Feed UnitHorizontal Pass Roller 2 and Timing Roller Paper Guide Reverse Roller Drive Unit Sensors Reverse flapper solenoid adjustmentOther Parts BeltsMaintenance list MaintenanceAR-CF2 Maintenance 7 AR-CF2 Troubleshooting 8 TroubleshootingPCB Tray alarm is displayed on the system display Electrical Section Actual Wiring ChartAR-CF2 Electrical Circuit Description Block DiagramOutline DC+5VCommunication Circuit Circuit DetailSensor Input Circuits Paper Exit Sensor Hisen Paper Width Detection Potentiometer TVR Paper Feed Motor Drive Circuit Kmot Motor Drive CircuitsReset Circuit Eeprom Circuit Operator Panel Drive Circuit Inrush Current Limiting CircuitOperator Panel Circuit Memo Memo Example LEAD-FREE SolderVaroitus Trademark acknowledgements
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