Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2125
| Posted: 08:38am 11 May 2025 |
I think wiseguy is correct and the resistors may not make a difference, but from the point of view not having the resistors hovering over the main output planes, it's still a good idea to fit physical small units.
There is obviously something not right, you may have to check all values on the power boards, especially C7, C8 and R18 to R20. Sometimes the AC waveform can look reasonable when lightly loaded, but turns to S#$T driving the extremely low impedance of a big heavy gauge toroid primary.
Until you can get Idle current at 18V into the ball park below 360mA then you have a problem.
The 97% PWM at the higher voltage would indicate a major problem with the inverter trying to get to 230Vac, it's having trouble by the sound and the current at that level.
I'm sure wiseguy will have more insight once you get the adjustable supply, that will help us get a much better picture of what's happening.
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Edited 2025-05-11 18:42 by KeepIS