Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1482
| Posted: 10:31pm 03 Nov 2024 |
I would test the Vfb circuit to ensure that TP5 increases in DC voltage
as the AC voltage increases going into the small feedback transformer.
and
Maybe watch Vfb (with the volt meter, with the meter's ground connected to
the control board's ground) rise to about 2.5V as it outputs 235VAC, and then
as you apply large AC loads, note Vfb.
In the case of proper closed loop control, Vfb should remain stable
and be 2.5V at idle AND when under load.
(the 2.5V might be 2.7V or something else, no matter, it must remain stable)