Heater Element Problem In S993A Vacuum Desoldering Gun
A couple of years ago I bought one of those handy desolder guns. It was the very affordable S-993A model which is extremely useful when IC’s and other through hole components need to be removed from large boards. It is a much faster and easier way especially if it concerns large pin count chips which would take much longer to removed them by hand the old way with just a desolder pump in one hand and a solder iron in the other. Sadly my S-993A occasional refused to warm up until it refused heating up completely. So it was time to open up the device and examine the inside.
I removed one screw on the other side and 7 on this side.
And I left the 3 screws on which the nozzle with the heater element was attached to the black round plastic connected. Next photos show the inside of the solder gun.
After removing the 2 screws that attached the small controller board, the 2 white and the blue and red wires from the heater element are clearly visible. Luckily I already previously had ordered a spare heater element and now it was time to replace the old defect heater.
The S-993 plastic is no cheap toy because the screws fit tightly in the decent plastic housing. And also the way in which the heater element is connected to the case makes it a more professional design.
Replacing the old with the new 4 wired element is a breeze and before I know it I am ready to close the case and screw the screws back in. Also the Earth green/yellow wire for safety protection against accidental electrocution is very well connected by a screw on the small inside metal piece of the heater element. As next photo shows.
In above photo I also removed the 3 outside screws from the round heater plate that was attached to the black plastic mount because it is obvious that I am going to need that connected to the new heater element. After checking all electronic parts on the small board and its solder joints it was obvious that only the element was defect. And after this repair I will have to order another spare element because they apparently will quit working in the end.
Previous photo shows that the S-993A new heater element is heating up perfectly! Next photo shows the 2 metal wires with different thickness that are needed when the solder gun opening is stuck by old solder to clear the gun from residue.
They are included with two different nozzles for small and larger solder pins/holes.
The small white cotton like round parts are needed to protect the motor and inside from being contaminated by the incoming hot solder parts from the nozzle when it sucks the solder into the glass tube. They are very expensive and way too costly to replace often! (4 of those small pieces sadly may cost about 14 dollar/euro or more! Which is plain ridiculous considering what they just are made of!). Next photo shows the new element and the seller or manufacturer I bought the spare heater element from.
A new spare heater element was ordered on Aliexpress for 12,71 Euro which was about 30% cheaper than from the majority of sellers.
For a repair engineer almost nothing is as important as keeping his equipment in good working order. After all we never know when even more important things come our way that need the use of these tools to fix them in the near future too! And our finished work is only as good as the quality of the tools we use.
Albert van Bemmelen, Weert, The Netherlands.
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Note: You can read his previous repair article in the below link: