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Blog post with circuit diagram and step by step instructions: https://pcbsmoke.wordpress.com/2015/07/12/diy-digital-soldering-station/
This video is about a Aoyue 968 Hot Air Unit Repair My Soldering station broke down and made quite a show of doing it. There were sparks from the hot air port, and smoke from the main unit. Fortunately the fix is really simple, new heater and a new fuse resistor. (good that the thing has one) After fixing it I have a lot more fluctuation on the hot air temps, and way more overshoot when it's heating up.
For more information about Induction Soldering equipment from RDO Induction, visit our website at http://rdoinduction.com/brazing-soldering.html or contact us at firstname.lastname@example.org.
Multi-lead hand soldering techniques lead-free SAC 305. Surface mount flat packs. IPC Class 3. John Gammell, Certified IPC Trainer, Certified Aerospace Instructor. Toll Free 1-800-903-5309 Minneapolis / St. Paul 612-205-8609
Roger explains how to reverse-engineer the ATTEN AT80D solder-station, how the analog circuitry works and how finally to fix the problem with the falsely displayed temperatures. The ATTEN AT80D soldering station has a severe problem with the displayed temperature vs. the measured temperature at the solder-tip. Demonstrated in this video: https://youtu.be/phDOs18MbRs This is because the temperature is measured at the heater-element and not at (or at least near) the solder-tip. So there is a big temeprature-differential due to the thermal resistance between the heater-element and the solder-tip. It could have been easily fixed in software or with the change of a single resistor in the hardware by ATTEN. Furthermore the contact-area between the heater-element and the solder-tip is very small. Thus the thermal-resistance is big and the control-loop for the temperature is not very stable with a big time-lag from switching the heater-element on until the heat has finally reached the solder tip. Download-Link for Schematics & Pictures: https://1drv.ms/u/s!AmW9-q-1GZM1g_YzAfAC5cSTP58FAg
when carrying out any repairs to an electrical item, ALWAYS unplug the item from the mains, and leave for 10-15 minutes before opening.
there may be dangerous voltages inside even after unplugging.
link for the soldering station.