GW Instek GOS-522 scope problem

[mgrimes]

I bought a GOS-522 scope at a yard sale and the trace only goes half way across the screen. I saw that back in 2005 Dex2006 had the same problem with this scope and was wondering if anyone knew what the fix was?

 

[KeepItSimpleStupid]

What does the Horizontal Position control do?

In a scope there are two plates for deflection. The electrons generally BEND toward each plate, so if there was a bad driver on one side it could surely cause this.

CRT tubes used in TV's used a different system of deflection.

 

[mgrimes]

The horizontal position control will move the trace from the left side of the screen to the center so at the end of the control movement there is only a dot at the center of the screen.

 

[KeepItSimpleStupid]

It basically does suggest that their could be a loose connection at the deflection plate or a defective component having to do with deflection.

 

[KeepItSimpleStupid]

here, there is a block diagram for the 622. https://www.eserviceinfo.com/downloadsm/21726/GoodWill_GOS 622/623.html Note the area around the horizontal deflection plates.

 

[mgrimes]

Thanks for the suggestions and especially for the manual link. I have not been able to spend much time on the scope, but I did discover that the voltage to one of the transistor drivers to one of the horizontal deflection plates is half of that to the other driver. I just need to keep going backwards from that point to where I don't have a problem.

 

[KeepItSimpleStupid]

Good. You got pointed in the right direction.