sci.electronics.repair@googlegroups.com

Today's topics:

* Midiverb ii issues? - 2 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/aaedd7aef36420d1?hl=en
* Question for the Brits here, what do you call a Belling-Lee connector? - 3
messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/b63d999facac6197?hl=en
* Isopropyl Alcohol for Cleaning Flux - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/a7a3663fd81cf5bd?hl=en
* hissing sound coming from behind woofer on one side AR11 - 1 messages, 1
author
http://groups.google.com/group/sci.electronics.repair/t/3a9cce9766f809ce?hl=en
* Shoes Stock (paypal payment)( http://www.brandtrade99.com paypal cheapsale -
1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/911692561bf3f68d?hl=en
* Wholesale Coogi Men Jeans ( - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/2f828743519909f9?hl=en
* Cheap Wholesale LV real leather Purse - 1 messages, 1 author
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==============================================================================
TOPIC: Midiverb ii issues?
http://groups.google.com/group/sci.electronics.repair/t/aaedd7aef36420d1?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Jul 25 2010 5:37 pm
From: "Arfa Daily"

"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:y1%2o.220782$U%7.143992@hurricane...
>
>
> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
> news:Efj2o.333105$NW.10213@hurricane...
>>
>>
>> "El Grillo" <nradina@gmail.com> wrote in message
>> news:0b3f8d3e-ce83-4a8d-a032-59a743522db2@k19g2000yqc.googlegroups.com...
>>> Hello,
>>>
>>> I'm an new electronic technician TRYING to grasp a hold of my
>>> troubleshooting skills.
>>> I have two Midiverb 2's on my bench currently.
>>>
>>> One I was able to repair by replaceing some bad Filter caps, but the
>>> other is still giving me all the indicator diodes are lit and the 2
>>> digit screen is dead.
>>>
>>> I tested all caps with an ESR meter and all is good.
>>> Noticed one small decoupling cap looked funky and replaced, but no
>>> luck.
>>> (I'm also a bit unsure if I replaced with the right cap. I had a few
>>> 104 film caps in the shop).
>>>
>>> SO...I'm asking for a bit of help from you all, if willing.
>>>
>>> Any idea where I should be looking?
>>>
>>> Thanks in advice for any help you can send my way.
>>>
>>> nicholas
>>
>> Supply rails all correct voltages and clean (check with digital voltmeter
>> and 'scope) ? Processor chip receiving correct reset ? Processor clock
>> running ? No user control jammed in 'operating' position ? Such things
>> can cause a processor to 'loop forever' if it executes a bit of code
>> during boot up, to check for button presses that are part of a diagnostic
>> entry sequence, and the button that's being 'pressed' is not one that is
>> being expected.
>>
>> Arfa
>
>
> You might pay particular attention to Arfa's suggestion of the uP
> receiving the correct reset.
>
> The first thing I used to do with these old style microprocessor things,
> after checking the power supplies, was to force a warm boot by taking the
> reset line low or high - whatever is appropriate to force a reset. (get
> the datasheet for the processor to find what is required and where) It
> was surprising how many then suddenly burst into life.
>
>
>
> Gareth.

Yes, good advice. A forced reset is a good test. However, the OP's
experience of dealing with this sort of problem appears limited, so if I
were he, I think I would definitely be looking for some schematics, as
without them, it's going to be difficult for him to troubleshoot this ...

Arfa

== 2 of 2 ==
Date: Sun, Jul 25 2010 5:37 pm
From: "Arfa Daily"

"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:y1%2o.220782$U%7.143992@hurricane...
>
>
> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
> news:Efj2o.333105$NW.10213@hurricane...
>>
>>
>> "El Grillo" <nradina@gmail.com> wrote in message
>> news:0b3f8d3e-ce83-4a8d-a032-59a743522db2@k19g2000yqc.googlegroups.com...
>>> Hello,
>>>
>>> I'm an new electronic technician TRYING to grasp a hold of my
>>> troubleshooting skills.
>>> I have two Midiverb 2's on my bench currently.
>>>
>>> One I was able to repair by replaceing some bad Filter caps, but the
>>> other is still giving me all the indicator diodes are lit and the 2
>>> digit screen is dead.
>>>
>>> I tested all caps with an ESR meter and all is good.
>>> Noticed one small decoupling cap looked funky and replaced, but no
>>> luck.
>>> (I'm also a bit unsure if I replaced with the right cap. I had a few
>>> 104 film caps in the shop).
>>>
>>> SO...I'm asking for a bit of help from you all, if willing.
>>>
>>> Any idea where I should be looking?
>>>
>>> Thanks in advice for any help you can send my way.
>>>
>>> nicholas
>>
>> Supply rails all correct voltages and clean (check with digital voltmeter
>> and 'scope) ? Processor chip receiving correct reset ? Processor clock
>> running ? No user control jammed in 'operating' position ? Such things
>> can cause a processor to 'loop forever' if it executes a bit of code
>> during boot up, to check for button presses that are part of a diagnostic
>> entry sequence, and the button that's being 'pressed' is not one that is
>> being expected.
>>
>> Arfa
>
>
> You might pay particular attention to Arfa's suggestion of the uP
> receiving the correct reset.
>
> The first thing I used to do with these old style microprocessor things,
> after checking the power supplies, was to force a warm boot by taking the
> reset line low or high - whatever is appropriate to force a reset. (get
> the datasheet for the processor to find what is required and where) It
> was surprising how many then suddenly burst into life.
>
>
>
> Gareth.

Yes, good advice. A forced reset is a good test. However, the OP's
experience of dealing with this sort of problem appears limited, so if I
were he, I think I would definitely be looking for some schematics, as
without them, it's going to be difficult for him to troubleshoot this ...

Arfa

==============================================================================
TOPIC: Question for the Brits here, what do you call a Belling-Lee connector?
http://groups.google.com/group/sci.electronics.repair/t/b63d999facac6197?hl=en
==============================================================================

== 1 of 3 ==
Date: Sun, Jul 25 2010 5:42 pm
From: Adrian C

On 25/07/2010 22:19, Geoffrey S. Mendelson wrote:
> Richard wrote:
>
>> I have never heard of it called a Belling-Lee connector, and I started
>> messing about with TV in England in about 1960.....
>> AFAIK, it's always called a TV aerial plug - this link to RS Components
>> could be useful:
>
> Belling-Lee is its name, but that's why I asked, I had no idea what
> people actually called them. From what I can tell, Belling-Lee is only
> used in the Wikipedia.

IEC 169-2

--
Adrian C

== 2 of 3 ==
Date: Mon, Jul 26 2010 12:22 am
From: "N_Cook"

Geoffrey S. Mendelson <gsm@mendelson.com> wrote in message
news:slrni4pb59.d6h.gsm@cable.mendelson.com...
> N_Cook wrote:
> > How about TV coax connector (in the UK that is)
>
> Great, thanks.
>
> > http://www.dastv.co.uk/images/pht/th_s/3407_DAS0982.jpg
> > What do Americans call the one shown in the above pic?
> > and I will add to my
> > http://www.divdev.fsnet.co.uk/tool_terms.htm
> > UK / USA Tool Terminology Translator
>
> 99% of people in the US would not call them anything, they have not, and
> will never see them.
>
> The few people that have are usually SWL's (some Grundig radios used
them),
> people who bought or sold PAL TV sets and VCRs (which is how they got the
name
> "PAL connectors".)
>
> RadioShack calls the adapter a "European TV adapter", but says it connects
> an F connector to a PAL-type antenna jack.
>
> Universal Radio calls them "PAL", as in PAL M (male) or PAL F. to F
> female adaptor.
>
> Geoff.
> --
> Geoffrey S. Mendelson N3OWJ/4X1GM
> To help restaurants, as part of the "stimulus package", everyone must
order
> dessert. As part of the socialized health plan, you are forbidden to eat
it. :-)

I'm not old enough to have called them or heard them being called Belling
Lee, only vaguely aware of the term. Even the UK "Bible", RS catalogue ,
cops out and calls them "standard plugs and sockets " and "aluminium plug"
for the ubiquitous one I URL'd pic of before , how ridiculous is that?

== 3 of 3 ==
Date: Mon, Jul 26 2010 12:46 am
From: "N_Cook"

Geoffrey S. Mendelson <gsm@mendelson.com> wrote in message
news:slrni4pb59.d6h.gsm@cable.mendelson.com...
> N_Cook wrote:
> > How about TV coax connector (in the UK that is)
>
> Great, thanks.
>
> > http://www.dastv.co.uk/images/pht/th_s/3407_DAS0982.jpg
> > What do Americans call the one shown in the above pic?
> > and I will add to my
> > http://www.divdev.fsnet.co.uk/tool_terms.htm
> > UK / USA Tool Terminology Translator
>
> 99% of people in the US would not call them anything, they have not, and
> will never see them.
>
> The few people that have are usually SWL's (some Grundig radios used
them),
> people who bought or sold PAL TV sets and VCRs (which is how they got the
name
> "PAL connectors".)
>
> RadioShack calls the adapter a "European TV adapter", but says it connects
> an F connector to a PAL-type antenna jack.
>
> Universal Radio calls them "PAL", as in PAL M (male) or PAL F. to F
> female adaptor.
>
> Geoff.
> --
> Geoffrey S. Mendelson N3OWJ/4X1GM
> To help restaurants, as part of the "stimulus package", everyone must
order
> dessert. As part of the socialized health plan, you are forbidden to eat
it. :-)

a masterclass on them
http://www.megalithia.com/elect/bellinglee/index.html

==============================================================================
TOPIC: Isopropyl Alcohol for Cleaning Flux
http://groups.google.com/group/sci.electronics.repair/t/a7a3663fd81cf5bd?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Jul 25 2010 5:56 pm
From: none@given.now (Joe)

In one of the posts about solder, somebody mentioned CVS Drug Store for
91% isopropyl alcohol.

I just called a CVS, it's $2.79 for 16 ounces and $2.99 for 32 ounces.
That's 20 cents more for double the 16 ounce size. (This is in southern
California).

A mildly related question: In thinking about other uses for rosin, it
occurred to me that I haven't seen any pitchers using a rosin bag for
years.

Maybe it went the way of the vanishing caboose. :)

--- Joe

== 2 of 2 ==
Date: Sun, Jul 25 2010 6:28 pm
From: "William Sommerwerck"

> I just called a CVS, it's $2.79 for 16 ounces and $2.99
> for 32 ounces. That's 20 cents more for double the
> 16 ounce size. (This is in southern California).

Even the quart size is overpriced. If you're willing to wait for a sale, you
should pay no more than about $1 per pint.

> A mildly related question: In thinking about other uses
> for rosin, it occurred to me that I haven't seen any pitchers
> using a rosin bag for years.

I can just see a pitcher tossing a roll of solder at the batter. <grin>

==============================================================================
TOPIC: hissing sound coming from behind woofer on one side AR11
http://groups.google.com/group/sci.electronics.repair/t/3a9cce9766f809ce?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Jul 25 2010 6:09 pm
From: Amanda Ripanykhazov

On Jul 24, 7:21 am, bz <WQAHBGMXS...@spammotel.com> wrote:
> Amanda Ripanykhazov wrote:
> > Anyone know what this means? This hissing sound isnt constant, it is
> > irregular:  It isnt related to the music or any movement of the cone
> > or any signal put through it, though it doesnt happen when no sound is
> > put through the speaker.
>
> > Frankly it sounds more mechancial than electronic (as if there is
> > something behind there!) but as I say, it isnt related to whatever is
> > coming through the speaker though it does increase and decrease with
> > adjustment of the volume control.  Andit is louder than most signals
> > put through the woofer itself??
>
> > Is it indicative of some pot in the crossover needing cleaning or is
> > there something else going on please? (I have seen reference to people
> > improving the sound of AR11s by bypassing the tone controls in the
> > speaker completely).  This speaker is quite elderly and I would
> > imagine that if it does use mechanical pots, they must be fairly dirty
> > by now
>
> I know it is a silly question, but are you SURE that the hiss isn't
> coming out of your amplifier?
> (have you put a scope on the speaker lines or substituted either speaker
> or amp?)
>
>  From your description, it isn't clear to me that you have eliminated the
> 'more obvious' possibility that your amplifier is putting out white
> noise, perhaps intermittently varying in amplitude.- Hide quoted text -
>
> - Show quoted text -

Yeah, switching one speaker pretty much solved that one.

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