Prokit's Industries SS-989 - Manual (Page 10)

9
apply fresh solder containing flux and clean the tip again. Repeat
until all the oxide is removed then coat the tip with fresh solder.
◆ If the soldering iron tip gets deformed, replace it with a new one.
V. Fuse replacement
When fuse is blown, replace it with the spare fuse. (see below picture)
1. Unplug the power cord from the power receptacle
2. Use the Phillip (+) type screwdriver to loosen the fuse holder
3. Replace the fuse with new one
4. Put the fuse holder back in place