I soldered in a 270 ohm resister as you did, but it made no difference.
I am attaching a photo of my PCB as suggested by DC42-- it appears to be a similar board to yours. It appears that your board has a wider boarder than mine, but that may just be a difference in production runs.
I am going to try different resisters as you suggest. I also notice that there is a pair of spots near the trimpot that appear to be for a surface-mount component. (See photo - marked RV, 3K) Is there anything soldered into place on your board in that location?
[attachment 45977 IMG_0275.JPG]
I am attaching a photo of my PCB as suggested by DC42-- it appears to be a similar board to yours. It appears that your board has a wider boarder than mine, but that may just be a difference in production runs.
I am going to try different resisters as you suggest. I also notice that there is a pair of spots near the trimpot that appear to be for a surface-mount component. (See photo - marked RV, 3K) Is there anything soldered into place on your board in that location?
[attachment 45977 IMG_0275.JPG]
