Re: Recapping Tektronix 2465


Chuck Harris <cfharris@...>
 

Not that I have ever seen. There are some versions of
the manual that have two capacitor numbers swapped on the
parts diagram... But, if you remove the old, and stuff
the new capacitors one at a time, that won't be a problem.

Where there is a problem is in replacing the SMD capacitors
on the late series 2465B's. The polarity of these electrolytics
is not marked in an obvious way in all cases. The capacitor
that is away on the corner of the board is not marked.

-Chuck Harris


On Fri, 26 Mar 2021 14:11:51 -0400 (EDT) "n4buq" <n4buq@knology.net>
wrote:
Thanks for clarifying that, Chuck.

Was there a different model where that was a problem? I seem to
recall the issue but don't recall which model(s) were affected.
Hopefully I'm not crossing up Tek and HP with this...

Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 12:57:40 PM
Subject: Re: [TekScopes] Recapping Tektronix 2465

All of the capacitors on the 2465 supplies have their polarity
markers pointing in the same direction. A few are non-polar
electrolytics, which don't matter.

-Chuck Harris


On Fri, 26 Mar 2021 13:46:03 -0400 (EDT) "n4buq" <n4buq@knology.net>
wrote:
I don't recall exactly to which model(s) this may apply, but I
think one of the 24xx models have the polarity marked incorrectly
on the PC board for one of the filter capacitors. Apologies if I
have this confused with a completely different model/series but I
thought it worthy of mentioning here.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Ozan" <ozan_g@erdogan.us>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 11:37:29 AM
Subject: Re: [TekScopes] Recapping Tektronix 2465

You may already know but at least in some service manuals
component placement diagram shows location of C1132 and C1115
swapped (wrong). This was the case for my 2467B, I assume it
also applies to 2465B. While desoldering take a note of the
original value to make sure. Ozan



iv3ddm

C1132 would be 160V. C1120 can be 100V. C1130 would be
160V. If you want
to use the original values of capacitance, fine. They can be
higher capacitance if you want. C1101 and C1102 would be 25V.
If I put 16V numbers there, it was my mistake. In mine, I
used 16V or 25V types (I do not have mine open at this time)
for the 5V supplies and 35V for the 15V supplies. These I had
in stock along with some other parts. I ordered what I
needed. The 330mfd Mr. Yachad says to use, I did. The kit he
sells is nice. He is exactly
right about the film caps! Replace those! The X1 and Y1 can be
used if you want even higher voltage capacity than the 2
types. In mine, the 1 types are
400-500VAC types. A 2 type can replace a 1 type. A 2 type is
not recommended
to replace a 1 type. The ones Mr. Yachad uses are also an
excellent/ideal choice. If you are on 230-240V mains, the
higher voltage caps are best. If you
have not already done so, go to Mr. Yachad's site about 2465B
recapping. I used that site as a reference do to mine. It
was my first time working on this
model. I did notice in mine the two 39meg resistors (R710 and
R910) on the bottom board were high, 45 and 50meg, and the
100meg on the high voltage board
was 170meg. They are now 40 and 100meg respectively. I could
not get 39meg without a long string of resistors. Mine also
did not have R1010 and R1019 across the NTCs. That was
factory done.

Mark















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