Tenma 72-905 O'scope
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
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