I'm trying to help a friend of mine with the problem involving those barely visible lines, running up and down on some ECP pjs.
I've found out that the first reason is given by the electrolytic capacitors on the LV power supply line.
Changing all the output voltage lines capacitors almost 90% of the lines disappear. The first reason is the age of the capacitors that lowers their filtering capability, but it's reccomended to
replace some output caps with bugger ones (in MFD).
Another kind of barely visible noise is given by the presence of the ACON board (incredible!) whenever I tried to put it, on some pjs, I experienced some image noises...
I tried to better filter the power supply in input to that board, but that doesn't change anything (and it's almost obvious).
I guess that the problem is related to the generation of the impulse voltage for the step-motors (the NE555 oscillator and so on...). For somewhat reason, a feedback impulse voltage, re-enters the general power supply line.
does anyone have any further info on that? any hint?
thanks in advance
Romano
I've found out that the first reason is given by the electrolytic capacitors on the LV power supply line.
Changing all the output voltage lines capacitors almost 90% of the lines disappear. The first reason is the age of the capacitors that lowers their filtering capability, but it's reccomended to
replace some output caps with bugger ones (in MFD).
Another kind of barely visible noise is given by the presence of the ACON board (incredible!) whenever I tried to put it, on some pjs, I experienced some image noises...
I tried to better filter the power supply in input to that board, but that doesn't change anything (and it's almost obvious).
I guess that the problem is related to the generation of the impulse voltage for the step-motors (the NE555 oscillator and so on...). For somewhat reason, a feedback impulse voltage, re-enters the general power supply line.
does anyone have any further info on that? any hint?
thanks in advance
Romano