I purchased a Leader LBO 502 scope from eBay hoping to use it for diagnosis of a problem with an old computer's motherboard. I am not knowledgeable about scopes but I have a reference that I am using to find my way around. The reference describes (and the scope manual also describes) using the internal calibration signal to generate a square wave pattern on the display. Following the prescribed procedure I am able to produce a pattern, but instead of a square wave the signal looks like two parallel dashed lines. In other words, the vertical traces are non-existent or at least too faint to discern, even with full brightness. Modifying the probe's compensator does nothing to resolve this.
I suspect this indicates some defect in the scope and am wondering whether to pursue repairing it or to scrap the scope. There are few resources in my area for competent electronics repair; I wouldn't know where to look for help. I don't have a spare scope for comparison nor does anyone I know, and obviously my motherboard diagnosis is going nowhere until I get this issue settled.
Any suggestions would be greatly appreciated.
Thanks.
I suspect this indicates some defect in the scope and am wondering whether to pursue repairing it or to scrap the scope. There are few resources in my area for competent electronics repair; I wouldn't know where to look for help. I don't have a spare scope for comparison nor does anyone I know, and obviously my motherboard diagnosis is going nowhere until I get this issue settled.
Any suggestions would be greatly appreciated.
Thanks.