Author Topic: Adapting an ZD-985 Desoldering Gun for the Hakko FX-888D?  (Read 990 times)

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Offline Paul3854Topic starter

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Adapting an ZD-985 Desoldering Gun for the Hakko FX-888D?
« on: January 11, 2024, 12:33:27 pm »
I wonder if it is possible to adapt the 88-552A Desoldering Gun used for the ZD-985 Desoldering Station.

I understand the ZD-985 is a clone of the Hakko 817 and 407 which use thermistors.

Reading this forum post about the ZD-985
https://www.eevblog.com/forum/reviews/zd-985-desoldering-station-cross-compatibility/
Someone linked a Greek forum of a DIY desoldering station using the 88-552A gun which they noted down 1.5 to 35 ohms across the thermistor pins
http://www.hlektronika.gr/forum/showthread.php?t=70303

Someone also on Autodesk Instructables attempted to adapt an 88-552A gun with Xtronic 9020 but ran into issues that the Xtronic 9020 uses an iron with a thermocouple, which led to the large resistance difference between the iron the the desoldering gun
https://www.instructables.com/Soldering-to-Desoldering-Station-Hack/

Since the ZD-985 is just a clone of the Hakko 472 and 817 gun, I found this forum post discussing the resistance of the thermistor "54 ohms at 23C"
https://www.eevblog.com/forum/repair/hakko-472-desoldering-pump-adding-a-aoyue-b1002a-desoldering-gun/

For the Hakko FX-888D, I found this eevblog forum where someone shared that the manual claims "between 43 and 58 Ohms"
https://www.eevblog.com/forum/projects/what-is-the-resistance-of-the-hakko-fx-888d-thermistorheater-at-higher-temps/
However also in the discussion, is stated that the sensor is just the same as the Hakko 936, with the link to this lovely post with a table, and based on the trend should be around 50 ohms for 23C
https://www.eevblog.com/forum/reviews/genuine-vs-fake-hakko-936-ceramic-heater-a1321/25/

Now for the elephant in the room, the voltage and power disparity.

The 88-522A desoldering gun is 24VAC 80W, however, the Hakko FX-888D for some odd reason is a distinctive 26VAC 65W.
I understand with the higher voltage, since the heater element is just like a resistor would draw more current, but should not overheat as it is limited to 65W?

I have found researching desoldering stations that use 27VAC like the ML-859, but cannot find just the gun tool for sale. The Yihua 948 seems to be also 27VAC, however, uses a thermocouple, based on an Amazon review I read of a buyer using it to adapt to an AOYUE station. Hakko has desoldering stations rated for 29V however the gun itself is over $300 and would assume uses a thermocouple as well as Hakko stopped using thermistors in their desoldering guns.

Obviously, with a 12-24V mini vacuum pump that claims -80kpa which is around 600 mm HG, the same as the other ZD desoldering station, the ZD-915.

While the Hakko FR-301 desoldering gun is heavily recommended, I am not too fond of the pump within the gun, and all Hakko desoldering stations are extremely expensive. I have tried the ZD-915, but it really sucked (not literally).
 


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