Digest for sci.electronics.repair@googlegroups.com - 9 updates in 3 topics

8:55 AM Penedão
dplatt@coop.radagast.org (Dave Platt): Dec 16 11:34AM -0800

In article <1aj17bp99gqdjcv4v5k0r6bkst0ldahl6l@4ax.com>,
>that's the result, not the problem. The cause is quite obvious once
>you see it. I posted the picture previously and Phil Allison caught
>the problem almost instantly. I didn't.
 
Are *all* *four* of those large caps installed backwards?!?
 
Yah. Amazing you didn't have a chassis full of oily linguine there.
Jon Elson <jmelson@wustl.edu>: Dec 16 03:00PM -0600

Jeff Liebermann wrote:
 
 
>>And, unless you are the manufacturer of said device, much of the above
>>will never be available.
 
> Gallons of coffee are available at your local supermarket.
 
I know where to find coffee, although I don't drink it.
 
 
> <http://802.11junk.com/jeffl/pics/home/slides/BL-shop5.html>
> Notice that there are three HP8620C sweep generators, and three
> SSI/Wavetek 3000b service monitors in the photo.
 
Manuals for test gear are usually available. But, for a lot of consumer
gear, automotive modules and industrial gear, they may NOT be! That can be
a real headache.
 
Old CNC control gear used to have fabulous manuals, with a theory manual
three times as big as the schematics.
 
But, on later gear, you were lucky to get drawings of the cables, some
configuration charts, and that was ALL that was ever allowed outside the
factory. So, you had to reverse engineer how a lot of stuff worked to
figure out what was wrong with it.
 
A woking unit to compare to is REALLY a huge help, when available.
 
Jon
"Shaun" <stereobuff07@gmail.com>: Dec 16 08:13PM -0600

"Cursitor Doom" wrote in message news:n4miat$8a6$1@dont-email.me...
 
Anyone care to share their experience on the correct approach to
troubleshooting? I'll kick off by suggesting:
 
1. Assume nothing.
 
 
2. If at first you don't succeed, destroy any evidence that you even tried!
 
 
3. Try Percussive maintenance first. If it works after you bang it, it has
intermitant connections, or components.
 
 
Shaun
"Shaun" <stereobuff07@gmail.com>: Dec 16 09:52PM -0600

"Cursitor Doom" wrote in message news:n4miat$8a6$1@dont-email.me...
 
Anyone care to share their experience on the correct approach to
troubleshooting? I'll kick off by suggesting:
 
1. Assume nothing.
 
 
Check all user accessible parts and power components, like transistors and
Diodes.
After the visual check of the components for burnt parts or over heated
parts and a smell test; I would flip the board over and inspect all the
solder joints usually with a magnifying lens and and check for cold or
fractured solder joints. When I'd find one I usually remove the old solder
with a solder sucker or wick and then re-solder the joint making sure the
component lead gets lots of heat during the solder process and I use real
solder. Parts or the board around components that got hot often had bad
solder joints from heating and cooling.
 
Shaun - serious post.
"pfjw@aol.com" <pfjw@aol.com>: Dec 17 05:22AM -0800

Amen to that- the working unit to compare!
 
I finished the Dynaco ST120 from hell last night. It came to me "fuzzy in one channel". And it was.
 
First run-through: One output transistor in the 'good' channel, one output and one driver in the other, still fuzzy. I wound up ohming out every part, comparing to the good channel. Six drifted resistors later, I got to the 5.1V zener diode. Bingo. It had become a 94 ohm resistor.
 
Given that these beasts blow up by the numbers, I generally install sockets for the outputs, and do the TIP mod once ALL else is under control.
 
Peter Wieck
Melrose Park, PA
John-Del <ohger1s@aol.com>: Dec 16 09:44AM -0800

On Tuesday, December 15, 2015 at 8:26:29 PM UTC-5, Michael Terrell wrote:
> are a lot of those out in the wild, as well. DIgikey has both of those
> styles, in the one dollar price range.
 
> <http://www.digikey.com/product-search/en/integrated-circuits-ics/memory/2556980?k=25L32>
 
 
Found it.. I don't know why but when I checked Ali yesterday, nothing showed.
 
 
http://www.aliexpress.com/item/Free-shipping-F25L32QAS1DM-package-SOP8-F25L32QA-ensure-original/32508327745.html?spm=2114.01020208.3.1.pZUoJA&ws_ab_test=searchweb201556_7,searchweb201644_1_79_78_77_82_80_62,searchweb201560_3
Dimitrij Klingbeil <nospam@no-address.com>: Dec 16 10:03PM +0100

On 15.12.2015 21:04, John-Del wrote:
> Googling only returns hits for programmers that can read and write
> to it, but no place to buy and no info for a sub. Anybody have any
> ideas? Even Alibaba returns zero hits (odd).
 
Hi
 
The datasheets look like this might be compatible with the M25P32 if
it's used in single-line I/O mode.
 
The M25P32 is more commonly available but it has only the standard SPI
interface. The F25L32 has an SPI interface too, but in addition it can
be switched to a two-line I/O mode as well. However if the device that
needs this chip only uses standard SPI and does not actually attempt
to switch it into two-line mode, a M25P32 could probably work as a
replacement.
 
Regards
Dimitrij
etpm@whidbey.com: Dec 16 09:51AM -0800

On Tue, 15 Dec 2015 18:05:36 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>first. Eventually, I'll need to build up the roof, which is where
>insulation will do the most good. One of my neighbors did that to
>their house that was similarly built, and it worked very well.
Greetings Jeff,
Your house makes me nostalgic. I grew up on the other side and at the
base of the Santa Cruz Mountains in Saratoga. Hitchhiked over to
Santa Cruz and then either north or south, depending on my mood. North
for the beaches, south for Capitola. Or right into Santa Cruz for the
Boardwalk. I hiked all over the Santa Cruz Mountains, in the summer I
hiked and camped as much as possible. Dug for sharks teeth in Scott's
Valley. The longest one I found was over three inches long but was
broken into two parts. It was in a dry rivulet in the sand parking lot
where we, and everybody else, dug for sharks teeth. I pretty much
stopped hitchhiking when it became nearly impossible to get a ride
because of that crazy guy who was killing hitchhiking girls. His mom
and her friend too. Buried their heads under stepping stones in the
yard. I think he was named Edmund Kemper. I remember buying chilled
dungeness crab, butter, sourdough bread, and beer and sitting with
friends on a dock eating it.
Cheers,
Eric
dplatt@coop.radagast.org (Dave Platt): Dec 16 11:30AM -0800

In article <3pg17bd61th4vopib0qv9dkb488sq5782b@4ax.com>,
 
> However, for the
>present situation, I'm looking into an adjustable cat or dog warming
>electric blanket.
 
Cat's aren't particularly adjustable, warmed or otherwise. They're
notoriously stubborn.
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