sci.electronics.repair@googlegroups.com

Today's topics:

* Fuse or fusible resistor? - 12 messages, 8 authors
http://groups.google.com/group/sci.electronics.repair/t/2017b4927dae47ef?hl=en
* PDF of SMD device codes and markings with pictures - 2 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/c9d697382b7b006e?hl=en
* Teac AG-790 has me stumped... - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/19f1f1c9d95691fb?hl=en
* Fire ants - computer bugs - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/7eecdfe1b1971fbf?hl=en

==============================================================================
TOPIC: Fuse or fusible resistor?
http://groups.google.com/group/sci.electronics.repair/t/2017b4927dae47ef?hl=en
==============================================================================

== 1 of 12 ==
Date: Sat, Jun 26 2010 9:46 pm
From: DaveC

Used in the battery (-) lead of a handheld scope. Schematics unpublished.

Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
"1E7A".

Google returns slim results, none promising.

What type is this?

Thanks,
Dave

== 2 of 12 ==
Date: Sat, Jun 26 2010 9:56 pm
From: Salmon Egg

In article
<0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>,
DaveC <invalid@invalid.net> wrote:

> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>
> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
> "1E7A".
>
> Google returns slim results, none promising.
>
> What type is this?
>
> Thanks,
> Dave

USE COMPLETE SENTENCES!

--
An old man would be better off never having been born.

== 3 of 12 ==
Date: Sat, Jun 26 2010 10:08 pm
From: David Nebenzahl

On 6/26/2010 9:56 PM Salmon Egg spake thus:

> In article
> <0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>, DaveC
> <invalid@invalid.net> wrote:
>
>> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>>
>> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
>> "1E7A".
>>
>> Google returns slim results, none promising.
>>
>> What type is this?
>
> USE COMPLETE SENTENCES!

A grammar nanny, eh?

You must be a big hit at parties ...

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

== 4 of 12 ==
Date: Sat, Jun 26 2010 10:09 pm
From: John Larkin

On Sat, 26 Jun 2010 21:56:44 -0700, Salmon Egg
<SalmonEgg@sbcglobal.net> wrote:

>In article
><0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>,
> DaveC <invalid@invalid.net> wrote:
>
>> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>>
>> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
>> "1E7A".
>>
>> Google returns slim results, none promising.
>>
>> What type is this?
>>
>> Thanks,
>> Dave
>
>USE COMPLETE SENTENCES!

Idiot
^^^^^ Not a complete sentence
^^^^^^^^^^^^^^^^^^^^^^^ Not a complete sentence

Etc.

John

== 5 of 12 ==
Date: Sat, Jun 26 2010 10:54 pm
From: Pieyed Piper

On Sat, 26 Jun 2010 21:56:44 -0700, Salmon Egg <SalmonEgg@sbcglobal.net>
wrote:

>In article
><0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>,
> DaveC <invalid@invalid.net> wrote:
>
>> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>>
>> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
>> "1E7A".
>>
>> Google returns slim results, none promising.
>>
>> What type is this?
>>
>> Thanks,
>> Dave
>
>USE COMPLETE SENTENCES!

Jeez. Yer an idiot.

== 6 of 12 ==
Date: Sat, Jun 26 2010 10:56 pm
From: Pieyed Piper

On Sat, 26 Jun 2010 22:09:36 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>On Sat, 26 Jun 2010 21:56:44 -0700, Salmon Egg
><SalmonEgg@sbcglobal.net> wrote:
>
>>In article
>><0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>,
>> DaveC <invalid@invalid.net> wrote:
>>
>>> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>>>
>>> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
>>> "1E7A".
>>>
>>> Google returns slim results, none promising.
>>>
>>> What type is this?
>>>
>>> Thanks,
>>> Dave
>>
>>USE COMPLETE SENTENCES!
>
>Idiot
>^^^^^ Not a complete sentence
> ^^^^^^^^^^^^^^^^^^^^^^^ Not a complete sentence
>
>Etc.
>
>John
>

I should have figured that not a goddamned soul actually tried to answer
the question.

It sounds like a 'soft-fuze'. That resets itself after tripping.

There is also a similar device used in hair dryer circuitry.

== 7 of 12 ==
Date: Sat, Jun 26 2010 11:34 pm
From: "Phil Allison"

"DaveC" <

> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>
> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A"
> or
> "1E7A".

** Sounds like a Pico Fuse:

http://media.digikey.com/photos/Littelfuse%20Photos/PICO%20II%20R251%20SERIES.jpg

Come in fast and very fast ratings with amps rated from 1A to about 15A.

When they blow, you need a soldering iron to replace them.

There are various Asians clones too.

..... Phil

== 8 of 12 ==
Date: Sat, Jun 26 2010 11:50 pm
From: "Phil Allison"

"DaveC"

> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A"
> or
> "1E7A".

** Sure that is not the other way around ?

Pico Fuse would use " 7A LE " as a the marking for a 7 amp fuse.

.... Phil

== 9 of 12 ==
Date: Sat, Jun 26 2010 11:51 pm
From: "N_Cook"

DaveC <invalid@invalid.net> wrote in message
news:0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org...
> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>
> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A"
or
> "1E7A".
>
> Google returns slim results, none promising.
>
> What type is this?
>
> Thanks,
> Dave
>

I take it , that its blown and I also take it that its not charred (fusible
R don't char or even discolour AFAIK)
Desolder it and scrape an axial line along its length . Then DVM resistance
check from either end. If a fusible resistor then maximum R read is what its
value was near enough.
FR breaks are usually to one end, normal R usually in the middle.
Although green is often axial inductor.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm

== 10 of 12 ==
Date: Sun, Jun 27 2010 12:04 am
From: Kevin McMurtrie

In article
<0001HW.C84C25A9011554E5B01AD9AF@news.eternal-september.org>,
DaveC <invalid@invalid.net> wrote:

> Used in the battery (-) lead of a handheld scope. Schematics unpublished.
>
> Physically similar to a 1/4 W resistor, color light green. Marked "IE7A" or
> "1E7A".
>
> Google returns slim results, none promising.
>
> What type is this?
>
> Thanks,
> Dave

Littlefuse makes green resistor-shaped fuses. Their logo is an 'L'
wrapped under an 'F' so their 'LF' could look like 'IE' on a worn part.

http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_251_253.pdf
--
I won't see Google Groups replies because I must filter them as spam

== 11 of 12 ==
Date: Sun, Jun 27 2010 12:27 am
From: DaveC

> Littlefuse makes green resistor-shaped fuses. Their logo is an 'L'
> wrapped under an 'F' so their 'LF' could look like 'IE' on a worn part.
>
> http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_251_253.pdf

Thanks, Kevin.

They way Littelfuse uses a stylized "LF", it could easily be mistaken for
"1E" or "lE".

Now to get one...

Thanks again,
Dave

== 12 of 12 ==
Date: Sun, Jun 27 2010 12:27 am
From: DaveC

> I take it , that its blown and I also take it that its not charred (fusible
> R don't char or even discolour AFAIK)

No, I don't have one. I threw it out with the old battery. :-(
Someone on-line volunteered to describe the one from his scope.
I'll not ask him to do a post-mortem on a working fuse. ;-)

Thanks,
Dave

==============================================================================
TOPIC: PDF of SMD device codes and markings with pictures
http://groups.google.com/group/sci.electronics.repair/t/c9d697382b7b006e?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Jun 26 2010 10:17 pm
From: Fester Bestertester

> http://www.4shared.com/document/QQRR-x46/SMD_Codes_Catalog.html
> SMD device codes and markings with pictures.

Why does a PDF download have a suffix of .exe? Anyone wanna guess?

== 2 of 2 ==
Date: Sat, Jun 26 2010 10:24 pm
From: Fester Bestertester

> http://www.4shared.com/document/QQRR-x46/SMD_Codes_Catalog.html
> SMD device codes and markings with pictures.

This download is the actual SMD Codebook PDF:

<http://elektronik.googlecode.com/files/SMD_Catalog222.pdf>

==============================================================================
TOPIC: Teac AG-790 has me stumped...
http://groups.google.com/group/sci.electronics.repair/t/19f1f1c9d95691fb?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jun 26 2010 11:31 pm
From: stratus46@yahoo.com

On Jun 26, 5:57 pm, "William R. Walsh"
<newsgrou...@idontwantjunqueemail.walshcomptech.com> wrote:
> I'm about to give up...
>
> I received a Teac AG-790 stereo receiver with burn damage to the PCB
> underneath resistors 7R41, 7R47, 7R?? (unmarked, next to 7R47) and 7R48. I
> repaired all of this damage, cleaned up the carbon that had been left behind
> and soldered to the nearest remaining good portion of the board.
>
> Up to this point, the receiver did what it has done since I got it. It
> played through the right channel only.
>
> I kept on looking and found a capacitor at location 7C27 (220uF, 16V) that
> had blown out the rubber plug at the bottom. So I replaced that. Now nothing
> works. I know the new cap to be good. The unit will power up just as it
> always has, there are no blown fuses and my repair job seems to be
> bulletproof (and correct, per the schematic in the service manual). The
> audio is gone, replaced only by a faint humming on speakers and headphones
> alike, in the right channel. Turning the volume dial does not change this.
> There is still nothing from the left channel. The unit is not in protection
> and nothing is getting hot, burning up or worse.
>
> In addition, the display on the front of the unit will now indicate "E0" (or
> maybe it's an O...no way to tell). This is not mentioned in the service
> manual, nor did I find anything in a web search. Operations from the front
> panel remain possible.
>
> I'm beginning to think that it may be too far gone to fix. Anyone out there
> with an eleventh hour idea?
>
> William

'blown plug' usually means the acid is out and quite possibly eating
away the traces near by. Replacing the cap may have finished off a
nearly gone trace. Do you have the prints so you can 'ohm it out' and
verify the connections are actually there?

G²

==============================================================================
TOPIC: Fire ants - computer bugs
http://groups.google.com/group/sci.electronics.repair/t/7eecdfe1b1971fbf?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Jun 26 2010 11:59 pm
From: "N_Cook"

Watched a nature TV prog on swarming behavior. Apparently these ants have
stowed away on planes and taken up residence in airports in S USA states ,
infesting computers in air traffic systems etc. No mention in the program
why jungle creatures have electric charge sensors in their antenna (stated
in the narration) but they naturally home in on live circuit boards
apparently and then swarm all over, causing mayhem.
Anyone have any operational experience of pc failure due to swarms of fire
ants ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm

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