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Tektronix 2225 50mz dual trace vertical trace issue

I have lost both Upper vertical trace position on both channels  I can move both traces below centre grid but not above  any ideals  and does anyone have a Service manual PDF for this scope ...

Comments
2025, February 16 - 11:58
#560590
lcsaszar
lcsaszar picture
9 years 10 months
*

Hello,

The fault is in the vertical amplifier. A service trick is to short the collectors of the final stage, and check if the trace jumps to the centre. Then go to the previous stage. If you can find the stage where there is no change (i.e. the trace remains off centre), one transistor in the next stage is at fault.
Q256 - Q257
Q230 - Q231
Q206 - Q207
Q202 - Q203
It is safe to short the collectors of the listed transistors with a piece of insulated wire (carefully!).

0

2025, February 16 - 07:51
#560586
TonyStark
TonyStark picture
3 years 9 months
***

Hello Chris!

https://elektrotanya.com/tektronix_2225_oscilloscope_sm.pdf/download.html

Does this fit? Good luck with the repair.

Regards: Tony

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