My ZD915 desoldering station lost fan speed, pump speed, and peak heating ability yeaterday. Today I did some investigation and discovered the 18v psu is only outputting 10v. Now, I know the basic idea of how a switching pau works but not well enough to quickly diagnose the faulty component. I know the transistor controls the pwm via the opto-isolator, and how the pwm drives the transformer, but I haven't the faintest idea what part is likely to cause the output to almost halve.
Any ideas what I should check?
Here's a photo of the pcb: https://drive.google.com/file/d/12Bm...w?usp=drivesdk
Any ideas what I should check?
Here's a photo of the pcb: https://drive.google.com/file/d/12Bm...w?usp=drivesdk
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