I've had an Aoyue 937+ soldering station for a bit over a year now. I've probably only used it about 5 times, for perhaps an hour each time, but now it doesn't work. The symptoms are:
- 1. The indicated temperature rises much more slowly than it did when I first received the unit.
2. It takes *much* longer to melt a solder joint than it did when I first received the unit. This occurs even when the indicated temperature is at a reasonable temperature for soldering.
Has anybody experienced these symptoms with a soldering station (not just an Aoyue)? I've read through the troubleshooting guide within the included manual and nothing seems to fit the symptoms that I have.
Here's what I've tried so far:
Even though the tip is very clean, I've replaced the tip a couple of times with no improvements in the results.
I've also made certain that the nuts holding the handle together were tightened well.
As directed by the manual, I've taken measurements of the resistance of the handle. These measurements seemed to be within the manual's specifications. Even so, I knew of nothing else to try, so I replaced the heating element.
The new heating element has resistance values that are very similar to the original's. Replacing the heating element did not fix the problem. For those who are curious, the following are the measurements of the handle:
- Between pins 1 and 2 (heating element): 19.7 ohms (manual specifies 18-23)
Between pins 4 and 5 (heat sensor): 1.2 ohms at room temperature. This is outside the specified range of 2.5-3.5, but turning the iron on for a few seconds, removing power and testing gave an initial value of 5.6 ohms, and it dropped back down through the specified range and to the 1.2 ohms within a few minutes. I believe that this indicates the temperature sensor is working properly and wouldn't produce the symptoms that I'm having.
Between pin 3 and the tip: 0.1 ohms (manual specifies below 2)
Between pins 4 and 2: No continuity (as specified by the manual)
Between pins 4 and 1: No continuity (as specified by the manual)
Between pins 5 and 1: No continuity (as specified by the manual)
Between pins 5 and 2: No continuity (as specified by the manual)
All of these values are within the ranges specified by the instruction manual.
I've contacted the manufacture asking for clues on what the issue might be, but after an initial round of questions of where and when I bought it, I haven't received any response.
I can't seem to find any other possible solutions to attempt to fix my station in the manual or elsewhere online, and I'd really hate to have to throw out this station after so little use. I have found that I can purchase a replacement handle, but with nothing suggesting the handle is bad, I don't want to go throwing good money after bad.
Do you have any suggestions on what I should try or test next?
Thanks for reading!