Re: 5111 Storage Scope Loss of -30VDC

Tim Phillips

From Tim P (UK)

I have a manual, thanks - in fact, after perusing the schematic, I realised
that my +38 V on the +30V test point is the UNREG voltage.
So, maybe the erstwhile +30V is not being regulated at all. I will check
around the +30V circuitry. Are the Darlington pass transistors (MJE800)
reliable with age ?


On Sat, 1 Feb 2020 at 21:06, p mc <pmc@...> wrote:


TekWiki has a complete 5441 manual.
It doesn't have "voltage and waveform" data but has the schematic, board
layout, adjustment & Theory of Operation info.

Do you have that?


On Fri, Jan 31, 2020 at 10:14 AM, Tim Phillips wrote:

from Tim P (UK)
re the 5111 - what was the problem with the -30V ?
I have a 5441 with a low -15V (11V) and a high +30V (+38V)
The LVPS in the 5000-series seem to be very similar. I would be
in your investigations and cure

On Thu, 30 Jan 2020 at 18:13, Mlynch001 <@mlynch001> wrote:

I believe that the "stuff" is a sealer of some sort that TEK used on
of their flush socket units. I see this on many of the newer TM5XX
ins as well as many scopes that use those soldered into the board pin

Michael Lynch
Dardanelle, AR

Join to automatically receive all group messages.