sci.electronics.repair - 16 new messages in 9 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: SMPS Clicking...
http://groups.google.com/group/sci.electronics.repair/t/b8d8ef25d8872acc?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Oct 11 2010 11:50 pm
From: "Michael Kennedy"

"circuit" <circuit@123456.tv> wrote in message
news:i90ga6$g3t$1@speranza.aioe.org...
>
>> I think you hit the problem dead on. The Y sus board is getting quite hot
>> but the x sus isnt. Any idea what would cause the board to consume more
>> wattage and therefore get hot?
>
> The components being heat-sinked are probably drawing too much power,
> either because they are about to quit and go total short condition, or
> whatever they are supplying drive power to is causing them to draw too
> much power. I have seen X-sus main output components with the large heat
> sinks short out, but so far never the Y-sys. A lot of the time the
> components being heat sinked are proprietary, and seem to have these heat
> sinks sonicly welded to them permanently. The only way to do a repair is
> to do a board swap with a known good board. Good luck.

Hmm.. I will have to have a look at the transistors and see if they are
propritary. They are attached by bolts and this board is designed to be
reparied judging by the detail of the service manual.

This tv was quite expensive when new and seems as if built in a different
era.. Say 25 years ago back when thigs were buit with repair in mind. The SM
actually lists individual components and how to troubleshoot them.

==============================================================================
TOPIC: can i bring new life to this old VCR?
http://groups.google.com/group/sci.electronics.repair/t/b80bdaff85d3a3a6?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Oct 12 2010 1:33 am
From: "N_Cook"

Mike WB2MEP <michael.w.appenzeller@lmco.com> wrote in message
news:4cacfbe3-7cc0-4470-8f70-c757d5d25ef0@j25g2000yqa.googlegroups.com...
On Oct 11, 2:05 pm, Meat Plow <mhyw...@yahoo.com> wrote:
> On Mon, 11 Oct 2010 09:28:48 -0700, nucleus wrote:
> > thanks for all the replies. problem appears to be belt related. trying
> > to get a new belt but encompassparts.com says belt is "no longer
> > available". anybody have a source for old VCR parts?
>
> You get the belt measurements and research a replacement based on that.
>
> --
> Live Fast, Die Young and Leave a Pretty Corpse

Try http://www.iglou.com/studiosound/index.htm
It looks like they have the belt & pinch roller you need.
Your VCR is old enough to use their make/model index.

Mike
WB2MEP

Such supplies are likely to be contemporaneous with your VCR and so unlikely
to have much life in them either. Consider cutting your own as they tend to
be quite large cross-section, square for round cross-section replacement
does not usually matter.

==============================================================================
TOPIC: Kenwood L-1000T, 1990
http://groups.google.com/group/sci.electronics.repair/t/90eff8f4c2e643e4?hl=en
==============================================================================

== 1 of 4 ==
Date: Tues, Oct 12 2010 3:24 am
From: "N_Cook"

Cydrome Leader <presence@MUNGEpanix.com> wrote in message
news:i90gcu$2ra$1@reader1.panix.com...
> William Sommerwerck <grizzledgeezer@comcast.net> wrote:
> >> Lets get things correct here. Memory backup capacitors can have
> >> very high capacitance values and extremely low leakage. That is
> >> not in dispute. The term supercap does not refer to the typical
> >> memory capacitor installed on consumer electronics equipment.
> >> That is a different type that has high series resistance. If you
> >> have a ESR meter, measure one for yourself but discharge it first
> >> for a long time.
> >
> > I'm not sure what the "typical" memory capacitor is. With respect to my
Lux
> > 5T50, the cap was one I selected and installed.
>
> for something like that from 1990, it would most likely be a cap made by
> Elna (quite likely dark blue) NEC (possibly green) or Panasonic (all sorts
> of colors). Standard Oil was even making them at the time.
>
> Also, they didn't have 'low' ESR supercaps like they do now, so ignore any
> crap off wikipedia or comparisons to modern datasheets for products that
> look the same.

I discharged overnight an NEC U6 265 green, 0.2F, 5.5V and got an ESR of
5.6R

== 2 of 4 ==
Date: Tues, Oct 12 2010 5:24 am
From: baron

Baron Inscribed thus:

> Baron Inscribed thus:
>
>> David Inscribed thus:
>>>
>>>> I would concur with William. I have a 0.22F @ 5v on my desk at
>>>> the moment, it holds its charge for many days.
>>>>
>>>> Best Regards:
>>>> Baron.
>>>
>>> Lets get things correct here. Memory backup capacitors can have
>>> very high capacitance values and extremely low leakage. That is
>>> not in dispute. The term supercap does not refer to the typical
>>> memory capacitor installed on consumer electronics equipment.
>>> That is a different type that has high series resistance. If you
>>> have a ESR meter, measure one for yourself but discharge it first
>>> for a long time.
>>>
>>> David
>>
>> Thanks for your note.
>> Yes the cap I have is intended for memory retention service. I do
>> have an ESR meter but it hadn't occurred to me to actually measure
>> it,
>> though I do take your point about discharging it first. I did
>> discharge it some time ago and was surprised by how much the voltage
>> had recovered the following day.
>>
>
> Just and update: I got the marked value wrong, its 2.2F @ 5v. There
> is
> no indication of the manufacturer. I've currently got a 4.5v 60ma
> torch bulb connected across it to discharge it. It took a few seconds
> for the bulb to stop glowing. Anyway I'm going to leave it overnight
> and check its ESR tomorrow. It should be well and truly discharged by
> then.
>

Following up: The ESR measures 10-11 ohms (last digit can't make up its
mind). Peak charge current from a 5v 0.5ohm source hits 480ma (AVO 8
on 1A range) before rapidly dropping to zero. Four hours later the
terminal voltage is still 5V (Advance 10Mopv meter).

--
Best Regards:
Baron.

== 3 of 4 ==
Date: Tues, Oct 12 2010 5:28 am
From: baron

N_Cook Inscribed thus:

> Cydrome Leader <presence@MUNGEpanix.com> wrote in message
> news:i90gcu$2ra$1@reader1.panix.com...
>> William Sommerwerck <grizzledgeezer@comcast.net> wrote:
>> >> Lets get things correct here. Memory backup capacitors can have
>> >> very high capacitance values and extremely low leakage. That is
>> >> not in dispute. The term supercap does not refer to the typical
>> >> memory capacitor installed on consumer electronics equipment.
>> >> That is a different type that has high series resistance. If you
>> >> have a ESR meter, measure one for yourself but discharge it first
>> >> for a long time.
>> >
>> > I'm not sure what the "typical" memory capacitor is. With respect
>> > to my
> Lux
>> > 5T50, the cap was one I selected and installed.
>>
>> for something like that from 1990, it would most likely be a cap made
>> by Elna (quite likely dark blue) NEC (possibly green) or Panasonic
>> (all sorts of colors). Standard Oil was even making them at the time.
>>
>> Also, they didn't have 'low' ESR supercaps like they do now, so
>> ignore any crap off wikipedia or comparisons to modern datasheets for
>> products that look the same.
>
>
>
> I discharged overnight an NEC U6 265 green, 0.2F, 5.5V and got an ESR
> of 5.6R

That's about half of the value I measured.

--
Best Regards:
Baron.

== 4 of 4 ==
Date: Tues, Oct 12 2010 10:44 am
From: "David"

"baron" wrote in message
news:i91jrh$810$1@news.eternal-september.org...

Baron Inscribed thus:

> Baron Inscribed thus:
>
>> David Inscribed thus:
>>>
>>>> I would concur with William. I have a 0.22F @ 5v on my desk
>>>> at
>>>> the moment, it holds its charge for many days.
>>>>
>>>> Best Regards:
>>>> Baron.
>>>
>>> Lets get things correct here. Memory backup capacitors can
>>> have
>>> very high capacitance values and extremely low leakage. That
>>> is
>>> not in dispute. The term supercap does not refer to the
>>> typical
>>> memory capacitor installed on consumer electronics equipment.
>>> That is a different type that has high series resistance. If
>>> you
>>> have a ESR meter, measure one for yourself but discharge it
>>> first
>>> for a long time.
>>>
>>> David
>>
>> Thanks for your note.
>> Yes the cap I have is intended for memory retention service.
>> I do
>> have an ESR meter but it hadn't occurred to me to actually
>> measure
>> it,
>> though I do take your point about discharging it first. I did
>> discharge it some time ago and was surprised by how much the
>> voltage
>> had recovered the following day.
>>
>
> Just and update: I got the marked value wrong, its 2.2F @ 5v.
> There
> is
> no indication of the manufacturer. I've currently got a 4.5v
> 60ma
> torch bulb connected across it to discharge it. It took a few
> seconds
> for the bulb to stop glowing. Anyway I'm going to leave it
> overnight
> and check its ESR tomorrow. It should be well and truly
> discharged by
> then.
>

>Following up: The ESR measures 10-11 ohms (last digit can't
>make up its
>mnd). Peak charge current from a 5v 0.5ohm source hits 480ma
>(AVO 8
>on 1A range) before rapidly dropping to zero. Four hours later
>the
>terminal voltage is still 5V (Advance 10Mopv meter).
>
>--
>Best Regards:
> Baron.

You have a good one with 10 ohms. The 10 - 15 year old ones had
much higher ESR even when new but still low leakage.

David

==============================================================================
TOPIC: ***Comprehensive Test Banks and solution manuals***
http://groups.google.com/group/sci.electronics.repair/t/376431dd78857fb7?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Oct 12 2010 4:46 am
From: Esolutions

Comprehensive Test Banks and solution manuals for student
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==============================================================================
TOPIC: ((((((()Comprehensive Test Banks and solution manuals(((((()
http://groups.google.com/group/sci.electronics.repair/t/72c451b8fd8bfcd4?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Oct 12 2010 4:48 am
From: Esolutions

==============================================================================
TOPIC: Driveway sensor, model 917-1, mfg. around 1993 by "Detector Systems"
http://groups.google.com/group/sci.electronics.repair/t/502c70dec1b2d85e?hl=en
==============================================================================

== 1 of 2 ==
Date: Tues, Oct 12 2010 6:12 am
From: klem kedidelhopper

I have this unit which I installed many years ago in a new fast food
business. The restaurant failed shortly after it was installed and I
got the equipment back. So in essence it is like brand new.and was
operational when it was removed from service.

The unit is a self contained box with loop sense wires and isolated
spdt relay wires. It operates from 120V. The loop was buried in the
driveway and so I was unable to retrieve that part of the system.

Installation was rather simple. Unfortunately I can't find the
installation instructions however I do recall that we had to cut the
asphalt driveway and bury a loop of AWG. 14 cable. The loop would
sense a large mass of metal over it such as a car, (as opposed to a
non metallic mass), at a drive through and operate a form C relay. I
would like to set this unit up in my own driveway now however the
problem is I don't remember the configuration of the loop, IE how many
turns there were in the loop or its diameter. Actually I think that we
buried it down 8 inches or so and that it was rectangular shaped but
I'm just not sure.

There is no longer a listing for Detector systems however the strange
thing is the number 917-1 does come up as some kind of driveway sensor
but I can't seem to find any information on it.

I would think that this type of unit must be similar to those that are
used at intersections for traffic light control but I'm not sure how
to find that information.

Does anyone have any experience with this type of sensor who can
advise me as to the sense loop characteristics? Thanks for any
assistance, Lenny

== 2 of 2 ==
Date: Tues, Oct 12 2010 7:48 am
From: nesesu

On Oct 12, 6:12 am, klem kedidelhopper <captainvideo462...@gmail.com>
wrote:
> I have this unit which I installed many years ago in a new fast food
> business. The restaurant failed shortly after it was installed and I
> got the equipment back. So in essence it is like brand new.and was
> operational when it was removed from service.
>
> The unit is a self contained box with loop sense wires and isolated
> spdt relay wires. It operates from 120V. The loop was buried in the
> driveway and so I was unable to retrieve that part of the system.
>
> Installation was rather simple. Unfortunately I can't find the
> installation instructions however I do recall that we had to cut the
> asphalt driveway and bury a loop of AWG. 14 cable. The loop would
> sense a large mass of metal over it such as a car, (as opposed to a
> non metallic mass), at a drive through and operate a form C relay. I
> would like to set this unit up in my own driveway now however the
> problem is I don't remember the configuration of the loop, IE how many
> turns there were in the loop or its diameter. Actually I think that we
> buried it down 8 inches or so and that it was rectangular shaped but
> I'm just not sure.
>
> There is no longer a listing for Detector systems however the strange
> thing is the number 917-1 does come up as some kind of driveway sensor
> but I can't seem to find any information on it.
>
> I would think that this type of unit must be similar to those that are
> used at intersections for traffic light control but I'm not sure how
> to find that information.
>
> Does anyone have any experience with this type of sensor who can
> advise me as to the sense loop characteristics? Thanks for any
> assistance, Lenny

A few thoughts on these sensors. Generally, the loop is non critical
and the unit automatically compensates for variation. The loop is
somewhat standardized since one does not dig up the road to change the
loop if the detector unit needs replacing. I seem to recall that the
loop is typically about 4' x 8' and about 2 or three turns. One could
easily tape a test coil to the driveway and try it out. Usually, the
coil is buried about 3-4" into the asphalt.
Try looking up the oldest sensor info you can find [Eagle signals?]
and see what info it has on the coil.
Usually, the connections on the quality sensors is by a single 'MS'
type circular connector with 8 connections. You should be able to open
the case and trace the pinout. Connections should be: AC input [line,
neutral, ground], Output [NC, COM, NO] and LOOP.
You could also check with your local roads department's electrical
shop. Good luck!

Neil S.

==============================================================================
TOPIC: Monica Pignnotti: Not to be Trusted
http://groups.google.com/group/sci.electronics.repair/t/6eab907769b4ab55?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Oct 12 2010 6:58 am
From: Anne Onime

Monica Pignotti is not to be trusted.

She is unfit to teach.

She and Marolyn Morford are setting up a very suspicious "deprogramming" clinic in the California desert.

There are indications that Pignotti is being funded by jihadist organizations.

Details?

http://www.fairfaxunderground.com/forum/read/2/353965.html

==============================================================================
TOPIC: ~~Comprehensive Test Banks and solution manuals~~
http://groups.google.com/group/sci.electronics.repair/t/15cedc8423ab3b6a?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Oct 12 2010 10:21 am
From: We The Instr

==============================================================================
TOPIC: sgc528[23] xref
http://groups.google.com/group/sci.electronics.repair/t/6861c55ad109c3a9?hl=en
==============================================================================

== 1 of 4 ==
Date: Tues, Oct 12 2010 1:18 pm
From: Franc Zabkar

On 11 Oct 2010 14:24:34 GMT, frank <frank@isnotvalid.it> put finger to
keyboard and composed:

>I'm looking for data about the two complementary transistors SGC5282 and
>SGC5283

I would think that complementary transistors would have distinguishing
prefixes to denote PNP or NPN. Are they possibly house numbers?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

== 2 of 4 ==
Date: Tues, Oct 12 2010 2:02 pm
From: "William Sommerwerck"

> I'm looking for data about the two complementary transistors,
> SGC5282 and SGC5283

> I would think complementary transistors would have distinguishing
> prefixes to denote PNP or NPN. Are they possibly house numbers?

Isn't SGC the prefix for Philips replacement semiconductors?

== 3 of 4 ==
Date: Tues, Oct 12 2010 2:11 pm
From: "Michael A. Terrell"

William Sommerwerck wrote:
>
> > I'm looking for data about the two complementary transistors,
> > SGC5282 and SGC5283
>
> > I would think complementary transistors would have distinguishing
> > prefixes to denote PNP or NPN. Are they possibly house numbers?
>
> Isn't SGC the prefix for Philips replacement semiconductors?

ECG. They bought the line from Sylvania.

--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

== 4 of 4 ==
Date: Tues, Oct 12 2010 5:01 pm
From: Archon

On 10/12/2010 4:18 PM, Franc Zabkar wrote:
> On 11 Oct 2010 14:24:34 GMT, frank<frank@isnotvalid.it> put finger to
> keyboard and composed:
>
>> I'm looking for data about the two complementary transistors SGC5282 and
>> SGC5283
>
> I would think that complementary transistors would have distinguishing
> prefixes to denote PNP or NPN. Are they possibly house numbers?
>
> - Franc Zabkar
There is a ref to this from 2002
http://forum.servomagazine.com/viewtopic.php?f=1&t=91&start=0

Heathkit Curve tracer.

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