Trio CS-1562 oscilloscope repair - 2SD401M replacement transistor?

[keeney123]

Re: Trio CS-1562 oscilloscope repair - 2SD401M replacement transistor?

Tell us what happens when you use BudM suggestion. I would think you would want to return the trace the way it was originally and they use the trace rotation knob. Once you get it where you want it push it back in so it will stay there.

[Agent24]

Re: Trio CS-1562 oscilloscope repair - 2SD401M replacement transistor?

According the service manual page 5, the INTENSITY knob #14 is also used for the TRACE ROTATION adj #24 page 6. So can the Intensity knob can be pulled out to let you do the TRACE ROTATION adj?

Tell us what happens when you use BudM suggestion. I would think you would want to return the trace the way it was originally and they use the trace rotation knob. Once you get it where you want it push it back in so it will stay there.

Nothing. Unfortunately the intensity knob can't be pulled out on mine. Only the trigger knob pulls out to switch between triggered and auto sweep.
I'm pretty sure it's only the CS-1562A which has the rotation control.
The manual for my CS-1562 is here: http://www.radiomuseum.org/r/trio_ke...lloscop_2.html but I don't have an account there to download it.

The other telling thing is that there are no wires leading anywhere near the tube except for the ones going to the base socket.

then get the trio diplaying a flat-line and use the metrix to trace the vertical drive back from the scancoils through the circuits till you find where it's getting cut/boosted

I will give that a try.

I also wonder if it's possible that the X and Y deflection plates in the tube are just not exactly 90 degrees to each other?

[budm]

Re: Trio CS-1562 oscilloscope repair - 2SD401M replacement transistor?

I do not see the DC Coil for rotation control in the diagram yet.