Todd wrote in message
...
On Jun 14, 12:31 am, "N_Cook" wrote:
Todd wrote in message

...

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. Figure it's a problem with the sweep circuit. Anyone seen
this?

Todd

With the power off check cold, initially, for differences between the 2
final X-drive transistors, usually long-tail paired.

Ok Tenma came thru with a schematic :-) Looks like I have a open 820uh
inductor that explans the low voltage on the one side. Now to try and
find one.

Thanks again for the help

Todd

+++++

You have to find why the inductor failed, maybe has a secondary function as
a fuse.