Hi Kevin,
There are some easy checks you could do before taking things apart.
locate r4242 and r4343 in the middle of the horizontal bd on the bottom of the scope.
they are right next to a hole that lets you connect to the crt deflection plates.
center the horz position control first , turn the brightness all the way down, and put the scope in xy mode.
then measure the voltage from ground to each of the resistors. should be about 50v on each one.
I suspect that one will read way off¡..
if so, look on your schematics an locate the ¡°side¡± that¡¯s off.
these will be your first suspects.
an easy test is to measure the bases of each transistor and compare with the same transistor on the ¡°Other¡± side¡. i. e. measure the base voltage on q4161 and compare it with q4361. same with q4273 and compare it with q4274¡
let me know what you find.
jim
On Dec 5, 2014, at 11:22 AM, Kevin Crossett kcrossett@... [TekScopes] <TekScopes@...> wrote:
Hi Albert. Appreciate the advice. I have checked the XY mode, but only with
no signal. The dot near the middle does move slightly, but only about a
half-an-inch or so. I don't have any way locally to create a triangular
wave form, and I don't have, or know anyone, with a second scope to use for
testing. I hope I don't need to desolder any of the transistors to check
them out. That would require some extensive disassembly, as far as I can
tell from looking at the physical component locations.
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