I have a replacement 24V/60W desoldering gun I would like to modify for use on my Aoyue Int958A+ soldering station. My 968A+ has a smoke absorber which has enough suction to double as a solder vacuum. Mapping the pins is relatively straightforward.
During my measurements, however, I found the desoldering gun's heat sensor resistance was significantly lower than my soldering iron's (see table below). When I briefly heated the tip of the gun with a torch lighter, I noticed the resistance steadily climb to around 6 ohms. Could this be a thermistor instead of a thermocouple? Also, is it possible to correct the resistance range by adding a ~50 ohm resistor in series with the heat sensor?
Desoldering Gun Pinouts
PIN WIRE PURPOSE 1 Black Heat Sensor 2 Blue Heat Sensor 3 Red Heating Element 4 Red Heating Element 5 White Trigger switch 6 White Trigger switch 7 CENTER Vibration sensor (unused)
Pins 1 & 2 1 to 2 Ω Pins 4 & 5 1 to 2 Ω Pin 3 & solder tip Below 2 Ω
Soldering Iron Port Pinouts
PIN WIRE PURPOSE 1 Blue Heating element 2 Green Heating element 3 Yellow Case ground 4 Red Heat Sensor 5 Black Heat Sensor 6 Unused
Pins 1 & 2 2.3 to 3.5 Ω Pins 4 & 5 43 to 58 Ω Pin 3 & solder tip Below 2 Ω