Sharp AR-CF2 service manual LEAD-FREE Solder, Example

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LEAD-FREE SOLDER

The PWB’s of this model employs lead-free solder. The “LF” marks indicated on the PWB’s and the Service Manual mean “Lead-Free” solder. The alphabet following the LF mark shows the kind of lead-free solder.

Example:

 

 

 

 

 

Solder composition

 

 

 

 

 

code (Refer to the

 

Lead-Free

 

 

table at the right.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a

5mm

 

 

 

 

 

 

 

 

 

 

 

 

 

<Solder composition code of lead-free solder>

Solder composition

Solder composition code

 

 

 

 

Sn-Ag-Cu

a

 

 

 

 

Sn-Ag-Bi

b

Sn-Ag-Bi-Cu

 

 

 

 

 

Sn-Zn-Bi

z

 

 

 

 

Sn-In-Ag-Bi

i

 

 

 

 

Sn-Cu-Ni

n

 

 

 

 

Sn-Ag-Sb

s

 

 

 

 

Bi-Sn-Ag-P

p

Bi-Sn-Ag

 

 

 

 

 

 

 

(1) NOTE FOR THE USE OF LEAD-FREE SOLDER THREAD

When repairing a lead-free solder PWB, use lead-free solder thread.

Never use conventional lead solder thread, which may cause a breakdown or an accident.

Since the melting point of lead-free solder thread is about 40°C higher than that of conventional lead solder thread, the use of the exclusive-use soldering iron is recommendable.

(2) NOTE FOR SOLDERING WORK

Since the melting point of lead-free solder is about 220°C, which is about 40°C higher than that of conventional lead solder, and its soldering capacity is inferior to conventional one, it is apt to keep the soldering iron in contact with the PWB for longer time. This may cause land separation or may exceed the heat-resistive temperature of components. Use enough care to separate the soldering iron from the PWB when completion of soldering is confirmed.

Since lead-free solder includes a greater quantity of tin, the iron tip may corrode easily. Turn ON/OFF the soldering iron power frequently.

If different-kind solder remains on the soldering iron tip, it is melted together with lead-free solder. To avoid this, clean the soldering iron tip after completion of soldering work.

If the soldering iron tip is discolored black during soldering work, clean and file the tip with steel wool or a fine filer.

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Contents Sharp Corporation Specifications Product OutlineExternal components Sensors and switchesExternal Views and Internal Structures AR-CF2 External Views and Internal Structures 3Motors, solenoid, and clutch Function outline Operational DescriptionStructure Operational descriptionNormal paper feed operation of inserter online/ offline Reverse paper feeding operation of inserter Entering reverse sectionHow to set stapling mode Offline mode settingHow to set punching mode Exiting from reverse sectionStart LED Mode LED LED indication on operator panelLED LED1 LED2 LED3 LED4 Alarm detection Paper jam/error detectionError detection List of Paper jamsAR-CF2 Adjustments 5 AdjustmentsPaper width detection level setting adjustment LEDPaper Feed Separation Unit Disassembly and AssemblyAR-CF2 Disassembly and Assembly 6 Pickup Roller & Paper Feed RollerPaper Feed Unit Horizontal Pass Roller 1 and Registration RollerHorizontal Pass Roller 2 and Timing Roller Paper Guide Reverse Roller Other Parts Sensors Reverse flapper solenoid adjustmentDrive Unit BeltsMaintenance Maintenance listAR-CF2 Maintenance 7 Troubleshooting AR-CF2 Troubleshooting 8PCB Tray alarm is displayed on the system display Actual Wiring Chart Electrical SectionAR-CF2 Electrical Outline Block DiagramCircuit Description DC+5VCircuit Detail Communication CircuitSensor Input Circuits Paper Exit Sensor Hisen Paper Width Detection Potentiometer TVR Motor Drive Circuits Paper Feed Motor Drive Circuit KmotReset Circuit Eeprom Circuit Inrush Current Limiting Circuit Operator Panel Drive CircuitOperator Panel Circuit Memo Memo LEAD-FREE Solder ExampleVaroitus Trademark acknowledgements
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