Digest for sci.electronics.repair@googlegroups.com - 10 updates in 3 topics

jeanyves <jeanyves@nowhere.com>: Jan 02 07:35PM +0100

On 2015-12-27 11:58:16 +0000, N_Cook said:
 
 
>> There appears to be several hundred gigabytes of manuals!
>> Have fun!
 
> Nice to see downloadable , simple hierarchic indexing for a change.
 
I'm looking for hameg 8014 service manual for quite a while, and still
it's not in this huge folder ...
if anyone has a link... thanks.
 
--
 
Jean-Yves.
John Heath <heathjohn2@gmail.com>: Jan 02 06:06PM -0800

On Saturday, January 2, 2016 at 1:35:54 PM UTC-5, jeanyves wrote:
> if anyone has a link... thanks.
 
> --
 
> Jean-Yves.
 
There is a operating manual here if that helps
 
 
http://elektrotanya.com/hameg_hm8014_milliohm_meter_um.pdf/download.html
Mike Tomlinson <mike@jasper.org.uk>: Jan 03 06:57AM

En el artículo <n5pi0h$llu$2@dont-email.me>, Cursitor Doom
 
>Many thanks for that pointer!
 
+1. Grabbed the lot, 112G in 26,714 files.
20,975 files after clearing out the crud.
 
Thanks to the OP.
 
--
(\_/)
(='.'=) Bunny says: Windows 10? Nein danke!
(")_(")
John Heath <heathjohn2@gmail.com>: Jan 02 11:51PM -0800

On Saturday, January 2, 2016 at 1:35:54 PM UTC-5, jeanyves wrote:
> if anyone has a link... thanks.
 
> --
 
> Jean-Yves.
 
Found your diagram for the hm8014. Unfortunately there is a nasty man with his hand out saying I have to give him money before looking at the service manual. You deal with him.
 
http://www.radiomuseum.org/r/hameg_milliohm_meter_hm8014.html
Chris Jones <lugnut808@spam.yahoo.com>: Jan 03 11:57PM +1100

On 27/12/2015 22:14, JW wrote:
> http://bee.mif.pg.gda.pl/ciasteczkowypotwor/
 
> There appears to be several hundred gigabytes of manuals!
> Have fun!
 
Also see this freshly added:
https://archive.org/details/manuals_tektronix
Bob Engelhardt <BobEngelhardt@comcast.net>: Jan 02 12:43PM -0500

On 1/1/2016 12:17 PM, gyro_john wrote:
> Might this be a battery issue? ...
> You might be able to check by swapping in a different battery pack.
 
I have tried different batteries - it is not a battery problem. Thanks
anyhow.
Bob Engelhardt <BobEngelhardt@comcast.net>: Jan 02 12:44PM -0500

On 12/29/2015 3:19 PM, Bob Engelhardt wrote:
>> ...
 
> Thanks. I'll definitely try that if I can't get it fixed under warranty.
 
> Bob
 
Long story short: warranty does not apply & I'm going to try to reflow
the board.
 
On cleaning the board I found some stuff that looked like the rubbery
caulk/adhesive that is used to stabilize components. On removing it I
found a TH device that has me puzzled. I'm worried that it might not
handle the reflow heat.
 
The pictures show it next to a brass (?!) heatsink that the power FETs
sit on and a close-up of it. The rubbery stuff covered it and bonded(?)
it to the heatsink. Thermal stuff?
 
https://www.dropbox.com/s/nf2odbubz0pgd78/DeviceOnBoard.jpg?dl=0
https://www.dropbox.com/s/axu84cbjlpqgh1q/Device.jpg?dl=0
 
What is it? Do I need to remove it for reflow?
 
Thanks,
Bob
Bob Engelhardt <BobEngelhardt@comcast.net>: Jan 02 10:23PM -0500

On 1/2/2016 12:44 PM, Bob Engelhardt wrote:
...
> https://www.dropbox.com/s/nf2odbubz0pgd78/DeviceOnBoard.jpg?dl=0
> https://www.dropbox.com/s/axu84cbjlpqgh1q/Device.jpg?dl=0
 
> What is it? Do I need to remove it for reflow?
 
I think that it's a thermistor. It _looks_ exactly like this one:
http://www.dxmht.com/products/thermal-resistor.htm
 
Since it's soldered in, it should be OK for reflow.
 
Bob
John Heath <heathjohn2@gmail.com>: Jan 02 12:34PM -0800

On Saturday, January 2, 2016 at 10:14:26 AM UTC-5, Tim R wrote:
 
> We had a power outage, traced to a break somewhere in an underground line. It was one of those ancient coaxial feeders, and it ran a good quarter mile through the woods, maybe more, it's been a while. How to find the break?
 
> We hired this specialist with a thumper, which is a pulsed high voltage DC. It makes a noise like a gunshot when the arc jumps the gap. You walk the route of the line (which you never know exactly because your drawings are always a little sketchy) and listen.
 
> Usually this works. Not this time - it arced for a while, then somehow the arc welded the break back together. No more pulses, no way to find the spot, we just turned the power back on and let it go.
 
Is the glass half empty or is the glass half full ? The way I see it you repaired the fault by sending a large EM pulse down the line knowing well that this would weld the two wires together therefore fixing the problem. That is the way I would write up the repair report.
"pfjw@aol.com" <pfjw@aol.com>: Jan 02 01:03PM -0800

For me, it is purely a hobby, with the occasional household appliance or vehicular item intruding on occasion. So 'production' is not an issue, and unless I see my worth, as it were, at very little, spending 12 hours and $20 in parts restoring a pre WW2 Hallicrafters ot 5 hours & $10 on a Dynaco ST120 is a fool's game were it not a hobby. But, as therapy, and as a source of quiet satisfaction, it is unsurpassed.
 
I tend to be fairly methodical, diagnostics, the repair based on same. Then about a 12-hour burn to make sure whatever it is is actually ready for polite society. No beancounters, no cost limits - a 'bulk' purchase might be 100 very common-value caps, or 20 common transistors, which might last a couple of years.
 
Peter Wieck
Melrose Park, PA
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