R-90GCK (serv.man9). Precautions for using lead free solder - Sharp Home Appliance Service Manual (repair manual)

r-90gck (serv.man9) service manual
Model
R-90GCK (serv.man9)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
8.26 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Precautions for using lead free solder
File
r-90gck-sm9.pdf
Date

Read Sharp R-90GCK (serv.man9) Service Manual online

23
R-90GCK
PRECAUTIONS FOR USING LEAD-FREE SOLDER
Sn-Ag-Cu
1. Employing lead-free solder
The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB
and in the service manual. The suffix letter indicates the alloy type of the solder.
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder
may result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40˚C higher than tin/lead alloy solder, it is recommend that
a dedicated bit is used, and that the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage
to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended
period of time. Remove the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause
premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not
required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more difficult. It will be necessary to clean and replace bits more often when
using  lead-free solder. To reduce bit wear, care should be taken to clean the bit thoroughly after each use.
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Here you can read online and download Sharp R-90GCK (serv.man9) Service Manual in PDF. R-90GCK (serv.man9) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-90GCK (serv.man9) Microwave Oven. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.