Hi, I have an Aplab 3706C that was given to me with an interesting fault. The fault appears on both channels equally and also when set to dual channel chop or alt modes. The attached photos show the fault with just one of the channels turned on - the lower the trace is on the screen the more skewed to the right the trace is. Also the effect gets worse the further the trace is to the right of the screen. In addition the higher up the screen the trace is the more it droops to the bottom as it moves across the screen from left to right. And there's more ... the further up the screen you move a trace the fainter it gets to the point of disppearing completely about 1cm from the top of the screen.
I am thinking that it might be a power supply problem? All of the components look clean and there is no obvious damage to anything internally. I have no idea what the power supply voltages are and there is no indictaion on the circuit board of what they should be.
I have not been able to find circuits for the unit and have asked Aplab if they can supply them (I doubt they'll give them to me). If it comes to it I'll trace the power supply board to produce a circuit in an attempt to figure out what the voltages should be.
Any advice would be appreciated. Many thanks in advance.
I am thinking that it might be a power supply problem? All of the components look clean and there is no obvious damage to anything internally. I have no idea what the power supply voltages are and there is no indictaion on the circuit board of what they should be.
I have not been able to find circuits for the unit and have asked Aplab if they can supply them (I doubt they'll give them to me). If it comes to it I'll trace the power supply board to produce a circuit in an attempt to figure out what the voltages should be.
Any advice would be appreciated. Many thanks in advance.