"Todd"
"Phil Allison"

Anyone have a source for a service manual for a Tenma 72-905 O'scope?
I have one that the horizontal trace stays on the left side of the
tube only.

** So you cannot centre the trace with the position control - OR - is
there
no trace, just a dot ?

Are both traces so affected ?


There is a trace not a dot and yes both traces are affected.

** Think it is something very simple.

Maybe an open resistor or a bad zener diode.

Check everything you can around that position pot.


..... Phil