On Sun, Feb 5, 2023 at 04:24 AM, george edmonds wrote:
The normal problem that I have found is that one of the SMD diodes CR301 to CR306 goes leaky and prevents the supply ever turning on.
I power up the control board from a low voltage current limited supply to fault find,? I have even used a 9V PP3 battery to do so.
Hi George, all,
thank you! I resumed this thread and found the Geroge's tips. Thank you very much @George. I started to check the two diode that I am able to identify on the left of T301 (CR301 and CR306) and both seem OK. CR301 is also directly connected to a transistor Q301 that I am not able to identify (1AM or IAM ??).
Could you so kind to explain how I can use a 9V pp3 battery to check this board? Do you mean inserted with the other two boards in the assy or I can test it alone on my desk and a simple 9V battery?
