Digest for sci.electronics.repair@googlegroups.com - 6 updates in 4 topics

Cydrome Leader <presence@MUNGEpanix.com>: Mar 28 08:44PM

> Plus it must have a mu-metal shield on the tube.
 
> I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
> Eats the Rigol for breakfast for what I do.
 
nice. How rare/common is the fancy shielding on a scope? I don't travel
with a scope so it's never been an issue for me.
 
A friend just got his first scope, some sort of mid 1980s Kenwood. He
emailed kenwood in japan and they send a scan of the manual. Sort of
jealous of it in fact.
Phil Allison <pallison49@gmail.com>: Mar 28 02:28PM -0700

Cydrome Leader wrote:
====================
 
> > I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
> > Eats the Rigol for breakfast for what I do.
 
> nice. How rare/common is the fancy shielding on a scope?
 
** Low cost, Asian CRT scopes are unshielded.
Everything else pretty much is.
 
 
> I don't travel with a scope so it's never been an issue for me.
 
** Got nothing to do with travelling.
 
> A friend just got his first scope, some sort of mid 1980s Kenwood. He
> emailed kenwood in japan and they send a scan of the manual. Sort of
> jealous of it in fact.
 
** Likely has no mag shielding.
 
Be a real PITA if you locate a mains transformer anywhere near the tube.
Such scopes must be sited well away from the work bench and other items of test gear.
 
Or else the trace shimmers horribly at 50/60 Hz.
Major scam, IMO.
 
 
..... Phil
Bennett Price <bjprice@cal.berkeley.edu>: Mar 28 09:51AM -0700

On 3/23/2021 5:55 PM, bob prohaska wrote:
> manufacturer's websites.
 
> Thanks for reading,
 
> bob prohaska
 
In re: Service / Shop Manuals To service an old Kenmore top loader
that was completely dead, I searched for shop manuals as I wanted the
schematic. Was able to find one for $10. But I decided to first open
up the control panel and take a look.
 
Inside was a printed manual with schematic, timing diagrams, diagnostics
for some of the controls, etc. Additionally, in tiny print a schematic
was pasted to the inside rear of the control panel.
 
Turned out the wall socket, which I should have checked first, was dead
and the washing machine was fine.
Cydrome Leader <presence@MUNGEpanix.com>: Mar 28 08:51PM

> was pasted to the inside rear of the control panel.
 
> Turned out the wall socket, which I should have checked first, was dead
> and the washing machine was fine.
 
Even if the fault was inside the unit, you'd likely be able to easily fix
the thing due to good documentation and parts supply.
 
I just looked at an LG electric oven service manual. It goes on and on
about all the places the solder connections will crack. It's sort of sad
actually. The guide is clearly written to satisfy quick and dirty warranty
repairs.
Jeff Liebermann <jeffl@cruzio.com>: Mar 28 10:29AM -0700

On Sun, 28 Mar 2021 01:13:16 -0400, micky <NONONOmisc07@fmguy.com>
wrote:
 
>How much electricity do these things use when not in use?
 
>1) Laptop power supplies, when the laptop is not on? Is it different
>when the laptop is disconnected?
 
Using my P4460 Kill-a-watt meter, I tried a mixed collection of
laptops and power supplies. Since the laptop is charging the battery
while it is turned off, and I didn't want to wait for the battery to
come to full charge, I simply removed the battery where possible:
 
Acer Chromebook 14
PS only 0 watts
PS with laptop turned off 0 watts
 
HP Pavilion dv8263dl
PS only 0 watts
PS with laptop turned off 3 watts

HP Pavilion dv6-1253cl
PS only 0 watts
PS with laptop turned off 0 watts
 
 
--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
Ken Layton <KLayton888@aol.com>: Mar 28 09:46AM -0700

On Sunday, March 28, 2021 at 4:16:29 AM UTC-7, Peter W. wrote:
 
> For those of us who have the awful habit of restoring vintage equipment with non-polarized convenience receptacles and who often have a hard time finding replacements - These fit Dynaco and similar products.
 
> Peter Wieck
> Melrose Park, PA
Good find! I haven't seen those in years. I forgot about Philmore making them.
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