The first model comes with 7 speed but I can only see only 5 TRIACs on the board. Not sure how it works.
Meanwhile the second model comes with 3 speed and 3 TRIACs available on the board. I assume 1 TRIAC for 1 speed.
While troubleshooting they look like their µC don't have enough power to start. The buzzer give something like repeating click sound. I did measure the µC Vdd/Vss and found out that the voltage is less than 5V.
After a quick search at Google, lead me to aztronics . Similar symptom. So I give them a try.
Desolder the capacitor and measure. Binggo! All caps (regulator part) value is less than they should be.
Replace them all and test with a smaller vent fan.
Done and pass them back to their owner to test with the their ceiling fan motor.
22nd Mar 2013, another board coming in. Same thing. µC powering problem.
Replace both caps solve the issue. It looks most of the ceiling fan across diff brand are having similar issue.
