Digest for sci.electronics.repair@googlegroups.com - 5 updates in 4 topics

Adrian Caspersz <email@here.invalid>: Feb 14 08:13PM

On 14/02/2021 11:19, Bo-Lennart wrote:
I friend of my, living far away from me, told me over the phone that he
want me to look to this "death" scope. So I like to be prepared when the
scope comes into my hand.
 
"Death" scope does not sound so inviting.
 
When you turn it on, make sure you are wearing rubber boots, gloves and
you are standing on a good rubber mat!
 
--
Adrian C
Jon Elson <elson@pico-systems.com>: Feb 17 03:00PM -0600

> night
> and colder? The system is York Borg Warned from 1965. Anyone know if
> there is a way to manually turn the heat on?
 
Can't say about your system. We have hydronic heat here (water-filled
baseboard radiators, a circulating pump, zone valves and 24 V AC gas valve.
The zone valves have a manual override catch that will lock them open. I
guess that was provided in case there was hope of convection, but I doubt it
would work on our system.
 
Some gas valves have a manual override to turn the gas on, but you'd need to
be VERY careful to not overheat the heat exchanger without the line-powered
fan or circulator.
 
What we did was disconnect the furnace from the hard-wired power and connect
to a generator. It is apparently illegal to have a furnace fed from a plug,
so we have to unwire and then rewire every power failure.
 
A gas-fired furnace doesn't draw very much electrical power.
 
Jon
"Peter W." <peterwieck33@gmail.com>: Feb 18 07:29AM -0800

We have a small 30A @ 240 VAC emergency generator. When it is in use, we run it to a 30A double-pole breaker in the panel, shutting off the main breaker at the same time. That will cover the freezer, refrigerator, boiler a few lights and other miscellaneous items as needed, without having to wire or unwire anything. The feed from the generator is 6/3 SJO cord, and the unit itself is grounded to a properly installed 8' ground rod. The three times we have had to use it for more than a couple of hours, it has worked nicely. Usually, we run a single-ended extension cord to our neighbors for their refrigerator as well.
 
Peter Wieck
Melrose Park, PA
Hilda Winkler <hildawinkler77@gmail.com>: Feb 17 12:58PM -0800

Hi Group, can someone help please, im working on a Samsung un55ku650dfxzaTV, that has no pic, no power standby light blinking. when testing the PS board on pins 3,5,7,9,.. i get 14v to 8v fluctuating, legend says they're supposed to 13v on all 4,.. im assuming leaky cap.. the filter caps read 395v on both,.. any help will be taken seriously,
"Peter W." <peterwieck33@gmail.com>: Feb 17 08:56AM -0800

> Better to stick a refrigerator magnet to the case and
> put the screws on the magnet.
 
Clearly there are no cats in your household.
 
Peter Wieck
Melrose Park, PA
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