Prokit's Industries SS-989 - Manual (Page 9)

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5. Insert power plug into power socket then turn on power switch.
6. Adjust temperature with regulation temperature knob.
***ATTENTION***
High temperature shortens tip life and may cause thermal shock to
components. Always use the lowest possible temperature when
soldering. It will also provide better protection for some components
which sensitive to temperature.
***ATTENTION***
Always put soldering iron into holder after use.
***ATTENTION***
Always clean the soldering iron tip after use and coat it with fresh
solder to prevent oxidation and prolong tip life.
7. Soldering iron tip maintenance and operation
● Always clean the soldering tip before use to remove any residual
solder or flux adhering to it. Use a clean and moist cleaning sponge.
Contaminants on the tip have many detrimental effects including
reduced heat conductivity which contribute to poor soldering
performance.
● If the soldering iron is not in use, do not keep it at high temperature
for long time otherwise the tin flux will become oxidized and reduce
heat conductivity function.
● After use, always clean the soldering iron tip after use and coat it with
fresh solder to prevent oxidation and prolong tip life.
●Checking and cleaning the soldering iron tip
***ATTENTION***
◆ Never cut the oxide on soldering iron tip by cutter.
◆ Set the temperature at 250℃or 482.℉.
◆ After the temperature is stable, clean soldering iron tip with
sponge, and check its condition. If the tip is badly worn or
deformed, replace it.
◆ If the tin-plating part of soldering iron tip covered with black oxide,