Digest for sci.electronics.repair@googlegroups.com - 13 updates in 6 topics

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J Burns <burns4@nowhere.com>: Oct 31 04:19PM -0400

> When I was a kid, the only classrooms with bathrooms were kindergarten
> classrooms. I guess it does make sense that they all would now.
 
When I was a kid, schools didn't have bathrooms. At home, my mother
made us bathe every week.
J Burns <burns4@nowhere.com>: Oct 31 04:15PM -0400

On 10/31/14, 6:14 AM, Mike Marlow wrote:
>> Problem, solved.
 
> How are ya supposed to grab a quick cigarette without getting caught that
> way?
 
Just holler to the teacher to turn on the ventilator because you just
stunk up the bathroom.
"Danny D." <dannydiamico@gmail.com>: Oct 31 09:03PM

Stormin Mormon wrote, on Fri, 31 Oct 2014 08:52:10 -0400:
 
> CA is noted for the liberal left leaning culture.
> Very possible the entire school system is run on self esteem, and
> fragile feelings, instead of old fashioned tried and true.
 
Does anyone here have high school kids?
Would you ask *them* what they use for a bathroom pass?
I'd be interested in the results.
krw@attt.bizz: Oct 31 07:00PM -0400

On Fri, 31 Oct 2014 01:25:48 -0400, "Michael A. Terrell"
 
> It's a lot less disruption to the class. I saw them during the last
>hurricane, when the building was used as a shelter for the disabled and
>senior citizens.
 
Less interruption? How so? When we were in high school (long before)
there were no "bathroom passes". Classes were 50 minutes with 10
minutes between. Young adults were expected to be potty trained.
sam@repairfaq.org (Samuel M. Goldwasser): Oct 31 04:39PM -0400

> magnetron. Do you have a tv repair place anywhere nearby? They would
> probably be willing to loan you a probe since they do not use them
> very often any more with solid state displays.
 
Geez, the magnetron is probably less than $20 on eBay.
 
--
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Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
 
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N_Cook <diverse@tcp.co.uk>: Nov 03 08:28AM

Putting my deer-stalker hat on. Someone had been inside to replace the
fuse. Left out some of the screws, including one self-tap that holds the
IEC. If that one was previously missing and the IEC just "held" by the
remaining one next to the TOP heatsink,loosened by repeated IEC
insertions AND the sillypad was punctured or close to puncturing. Then
the drummer tripped over the lead, IEC twisted and the IEC holding screw
touched the heatsink, as it is long enough, then blown TOP244, but about
4mm gap to swing across to do so. But as there are no pcb standoffs to
chassis in that area, relying on the IEC screws to chassis, then perhaps
the whole pcb being tilted in a downwards sense, by drummer standing on
the lead, and then only that arctan(2/20) 2mm gap for heatsink to
contact chassis.
"Gareth Magennis" <sound.service@btconnect.com>: Nov 03 03:40PM

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:m37eaf$i00$1@dont-email.me...
> that area, relying on the IEC screws to chassis, then perhaps the whole
> pcb being tilted in a downwards sense, by drummer standing on the lead,
> and then only that arctan(2/20) 2mm gap for heatsink to contact chassis.
 
 
 
 
Seems Peavey these days have turned all Chinese, they always used to be very
conventional and pretty reliable really..
 
I have a small mixer here now, a PV8 USB. It uses an 8 pin DIL JRC2360
DC/DC converter, I think to generate the 48v phantom from the 15v DC input.
 
Anyway its busted, and an easy diagnosis because a bench supply input heats
up this chip nicely. (The supplied SMPS wall wart trips out).
In the old days, a fault with the phantomn power part of the PSU was very
unlikely to render the whole mixer dead.
 
Cuh.
 
 
 
 
Gareth.
N_Cook <diverse@tcp.co.uk>: Nov 03 04:17PM

On 03/11/2014 15:40, Gareth Magennis wrote:
 
> Gareth.
 
Nothing obviously loading the ps (cold) will power up replacement
tomorrow, presumably 48V and raw +/-15V as only one vr on the smps pcb,
component side of the big board not seen.
Looking a bit deeper into TOP24* datasheet. This PV14 has the 4 central
pins connected together, 3 terminal device, which is over-voltage
disabled mode.
So what happens in mains dropout and reconnection scenario, as with
drummer tripping over the mains lead and auto-restart on what it
erroneously determines to be low mains voltage setting. Would
probalistically be the same for those floppy 4-way plastic distribution
sockets, breaking and making, blowing the supply, if this is a potential
failure mode. 240V in the UK.
Leif Neland <leif@neland.dk>: Nov 03 02:46PM +0100

Phil Allison kom med følgende:
> issues with hidden moisture.
 
> On informing the customer of my success he asked:
 
> " was there much to do" ?
 
What was your bill?
What is the cost of a new one?
Was the customer ensured?
What warranty do you offer on the repair?
 
Will it ruin the show if this speaker dies during a performance?
 
In short, while the repair was heroic, I would have turned down the
customer, or at least informed of the risk of future failure.
 
Leif
 
--
Husk kørelys bagpå, hvis din bilfabrikant har taget den idiotiske
beslutning at undlade det.
N_Cook <diverse@tcp.co.uk>: Nov 03 02:10PM

On 03/11/2014 13:46, Leif Neland wrote:
 
> In short, while the repair was heroic, I would have turned down the
> customer, or at least informed of the risk of future failure.
 
> Leif
 
Seawater or tap/rain water? Powered up or on standby when flooded?
Genesys <wolstech@gmail.com>: Nov 02 05:48PM -0800

> IC601# IC PHOTOCOUPLER TLP781F(D4-FUNBLL F) QPEL781FBLLF Is whats listed in the service manual.
 
The original post is 14 years old...
"Maynard A. Philbrook Jr." <jamie_ka1lpa@charter.net>: Nov 02 09:05PM -0500

In article <282ff2f9-d6a6-4159-8bc1-3cc7deeac6f6@googlegroups.com>,
wolstech@gmail.com says...
 
> On Sunday, November 2, 2014 7:19:48 AM UTC-5, djne...@gmail.com wrote:
> > IC601# IC PHOTOCOUPLER TLP781F(D4-FUNBLL F) QPEL781FBLLF Is whats listed in the service manual.
 
> The original post is 14 years old...
 
Better late than never, I say..:0
 
Jamie
Michael Black <et472@ncf.ca>: Nov 02 01:11PM -0500


> They generally bagged them up individually. It surely helped. I am sure
> this was not thir intention, to get their money (not) like 35 years
> later, but oh well.
 
When they bagged them individually, it could be "self-serve". And yes,
those things last long as artifacts.
 
There's a place here that looks like a parts store forty years ago. I'm
not sure it's been in the same location all that time, but it's been
around at least that long. Specializing in shortwave, it's an odd mix of
parts and old equipment. And the window is wonderful, all kinds of old
junk, including packaged parts from the old days.
 
Michael
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