So the +85 is a little high which suggests that V659 might be out of spec
(the later 5651A is supposed to regulate to within 3V), but that shouldn't
prevent the supplies from working properly.
The fact that all your supplies are high except for the -100 suggests to me
that the -100V supply is overloaded. Because it's being pulled down (less
negative) by the load, the power supply circuit is attempting to
compensate. This compensation is not enough to overcome the load on the
-100V supply, so that still measures low. However, the compensation is
driving the other supplies high. Because the power supply uses the -100V
rail as it's feedback for regulation, it doesn't know nor care that the
other rails are high, just that the -100V isn't negative enough.
You mentioned that your scope runs hot. Anything with tubes is going to get
a little warm, but if it's warmer than it's supposed to be, it could be due
to burning more power than it should be.
A good test for my theory will be to find a way to remove the load on the
-100V supply and see if you can then adjust all the rails into
specification with R641. Obviously, when disconnecting the loads, we still
want to make sure that R642 is connected so that the regulator can be
expected to function.
Parts of the circuit that use the -100V supply:
Horizontal Amp (where your "warping" is probably happening)
In other words, most of the scope. That supply goes to a lot of places.
Try powering up the scope with V334 and V434 removed from their sockets and
see what the -100V supply does.
On Fri, May 5, 2017 at 9:06 PM, enchanter464@... [TekScopes] <
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