On Wed, May 9, 2018 at 01:15 pm, Richard Knoppow wrote:
You nailed it. you beat me to it. I did attribute it to a mistake but it is not. I am too aware of mistakes on prints, thy occur quite a bit in consumer. You see a wire that says 12 volts and then a inch or two away it says 0 volts. And it is no mistake like the one voltage is something else, I have seen them where it is simply not possible. And they don't really care.
Anyone who doesn't see it - observe the dot that indicates a connection there at BA and BB. Look at the other dots. This one is bigger. Well it is bigger because it is not a dot, it is a circle. The coax is grounded on that side but not on the other. This is not that uncommon.
I have to admit it fooled me up until very recently. I have shit eyesight, I thought I was used to it and I am to a point, but still I missed this.
That doesn't change the fact that I dismissed it as a mistake for troubleshooting purposes up to this point, and the resistors were the wrong value.
This is nothing. Poor eyesight contributed to me frying a 7603. I switched two of the plugs on the Z board and dumped 130 volts into the unobtanium horizontal IC. Luckily I had a parts donor handy. If not I would have been guilty of criminal involuntary scopicide. So this is nothing.