The following article explains how to modify the Hakko 850 Hot Air Rework Station to use a Nitrogen supply instead of the air supply provided by the self-contained pump.
NOTE: The Hakko 850 Hot Air Rework Station is discontinued
NOTE: Modification of any Hakko product is not supported and will void the product warranty. This information is provided as-is.
IMPORTANT: The Air Flow Control Knob on the front of the unit will no longer have an affect. This knob controled the speed of the self-contained pump which affected air flow. Since the pump is no longer in use, the flow of Nitrogen must be controlled at the source.
Step 1
Remove the cover of the Hakko 850 Hot Air Rework Station by removing the 4 phillips pan head screws from each side of the unit. The interior will look like the photo shown below.
Step 2
Drill a hole in the rear of the unit to pass the supply line for your nitrogen supply.
IMPORTANT: When drilling the hole, be sure not to damage the product specification label and/or fuse holder.
Step 3
Disconnect the Secondary Air Supply Line at the Air/Electrical Coupling, then attach your Nitrogen supply to the Air/Electrical Coupling.
Step 4
Since the pump will no longer be needed, disconnect the pump from the PCB at the connection shown in the image below.
Step 5
Re-install the cover of the unit.