Have had this 545 sitting, unused, for years, in my utility room. Bought it
surplus for 50 bux about 20 years ago. IIRC, it 'used to work fine'.

I wheeled it into my ham shack last week, and turned it on. The trace was
too bright and would not turn down completely. After a few minutes, it shut
down. Found that the FAN mounts had deteriorated and the cooling fan was
not turning. After making new fan mounts and digging lots of small pieces
of aluminum (from the fan hitting the filter) out of the scope, I turned it
on again. Still too bright. Focus/astigmatism are poor also.

Beam blanking seems to be working as the spot goes away when there is no
sweep.

Checking voltages, the 220 volt test point on the upper right side is only
about 135. Other voltages (500, 350, 100, -150) are all good.

Is anyone familiar enought with this old workhorse of a scope so that they
can tell me which components are most likely to cause this problem?

Also, I would expect that there would be some key or pictures of the layout
of the beast that would show me exactly WHERE each part is located. For
example, I have a capacitor (black body) on the right side, in what looks
like the delayed sweep section, that has a crack along the side of it. I
cut one lead and measured. Doesn't seem to be leaky. Can not read the color
code on the part. I would like to know which part it is so can compare a
cap meter reading with the spec for the part WITHOUT having to trace wires
and figure out which cap it is. Does anyone know if there is a simple
correlation between part locations and names or part numbers or a parts
layout drawing available?

Checked the tubes in the power supply section and found 1/2 of a 12AX7 that
is marginal. My box of tubes that used to reside in my carport has
disappeared, some years ago. Either stolen, given away or discarded while
cleaning up, so I have ordered a russian knockoff from a tube supply house.
I did try a 12AT7 from an extra plug in, but that didn't fix the bright
trace.



--
bz

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.




--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

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