http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* Unknown Turntable belt size - how to determine? - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/c24e9d584f436d41?hl=en
* Looking for PS glitch with Tek scope? - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/ecf659bcc56a1548?hl=en
* 2000 Lincoln ignition coil problems - 4 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/4681fb0a9d56c3b0?hl=en
* 40Gb Western Digital hard drive - 4 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/d11c27dd9c7d80c0?hl=en
* Sony PS-LX520 Turntable Power Supply Fault - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/8383b4d4bdc7d72a?hl=en
* adidas NBA jersey (http://www.cntrade09.com/) - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/82f5cb0341c10a17?hl=en
* Rubber keyboard contact repair - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/61db4df7250c5d17?hl=en
* Simple hack to get $500 to your home. - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b0b9cb16ad105ccc?hl=en
* See Hot Sexy Star Aishwarya Nude Bathing Videos In All Angles. - 1 messages,
1 author
http://groups.google.com/group/sci.electronics.repair/t/fda2aa9fa2e65ed3?hl=en
* Surge Protectors - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/9a42e9c9a84828d9?hl=en
* More Lies about Monica Pignotti - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/85ffd993406f3bbe?hl=en
* RCA chassis ATC010A - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/6ea1ceadfb8a0425?hl=en
* MC68701 Controller - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/ce2dc0d81d300503?hl=en
==============================================================================
TOPIC: Unknown Turntable belt size - how to determine?
http://groups.google.com/group/sci.electronics.repair/t/c24e9d584f436d41?hl=en
==============================================================================
== 1 of 3 ==
Date: Thurs, Jun 3 2010 9:38 pm
From: David Nebenzahl
On 6/3/2010 11:42 AM William R. Walsh spake thus:
> Hello all...
>
> I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd like
> to get the turntable going again. (Despite the source, it's a pretty nice
> stereo system...the radio tuner works well, it seems to have about a 40Wx2
> output power rating (which seems reasonable, having looked at the
> internals), the cassette deck is a partial logic design with the ability to
> skip ahead 1, 2 or 3 songs and the turntable itself is a linear tracking
> type.)
>
> Anyway, before I stored it, the turntable was in need of a new belt. I set
> the belt aside and now it seems to be gone. I could have sworn that I read
> about how to determine an unknown belt size in the FAQ, but I could not find
> it just now. As best I remember, a string was used and placed around all the
> components driven by the belt, after which a measurement was taken.
Instead of string, which does stretch, you might try a strip of paper.
Which reminds me of an old turntable I used to have. As a kid in Tucson,
not quite 20, I found a used turntable in a junk shop there. Cheap,
because it had no belt. Took it home, and being the resourceful lad I
was, I made a belt out of paper, the ends glued together with white
glue. Worked great! No problems with wow & flutter or rumble. The paper
belts lasted maybe a month or so before breaking. The bulb-shaped motor
pulley kept the belt tracking true.
Can't remember the brand, but it was an interesting turntable. Very
simple: just a deck, a motor, a spindle with inner and outer platters,
and an arm mounted on some kind of isolator. The arm had a single pivot.
Worked really well. (My poor man's AR.)
--
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)
== 2 of 3 ==
Date: Fri, Jun 4 2010 6:07 am
From: zekfrivo@zekfrivolous.com (GregS)
In article <pan.2010.06.03.20.25.51@gmail.com>, Meat Plow <mhywatt@yahoo.com> wrote:
>On Thu, 03 Jun 2010 20:05:21 +0000, GregS ǝʇoɹʍ:
>
>> n article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d@mchsi.com>, "William R.
>> Walsh" <newsgroups1@idontwantjunqueemail.walshcomptech.com> wrote:
>>>Hello all...
>>>
>>>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd
>>>like to get the turntable going again. (Despite the source, it's a
>>>pretty nice stereo system...the radio tuner works well, it seems to have
>>>about a 40Wx2 output power rating (which seems reasonable, having looked
>>>at the internals), the cassette deck is a partial logic design with the
>>>ability to skip ahead 1, 2 or 3 songs and the turntable itself is a
>>>linear tracking type.)
>>>
>>>Anyway, before I stored it, the turntable was in need of a new belt. I
>>>set the belt aside and now it seems to be gone. I could have sworn that
>>>I read about how to determine an unknown belt size in the FAQ, but I
>>>could not find it just now. As best I remember, a string was used and
>>>placed around all the components driven by the belt, after which a
>>>measurement was taken.
>>
>> A turntable belt has a lot of stretch to it.
>
>Depends on the individual TT. I've seen belts made of rubberized fabric
>that didn't stretch at all. My old Rek-O-Kut TT had a belt that would not
>stretcch at all made of some woven vulcanized rubber stuff. Any TT with a
>heavy platter like the Rek-O is likely to have a stiff belt. Some of the
>el-cheepo tables with aluminum platter will likely have a more stretchy
>belt but it's not etched in stone.
The whole idea is isolation. All mine had loose belts. My
best Thorens TD-125 was stretchy. Had a SME arm to install on it, but
sold them both.
greg
== 3 of 3 ==
Date: Fri, Jun 4 2010 6:27 am
From: Meat Plow
On Fri, 04 Jun 2010 13:07:28 +0000, GregS ǝʇoɹʍ:
> In article <pan.2010.06.03.20.25.51@gmail.com>, Meat Plow
> <mhywatt@yahoo.com> wrote:
>>On Thu, 03 Jun 2010 20:05:21 +0000, GregS ǝʇoɹʍ:
>>
>>> n article <O9idnSsjYas_aprRnZ2dnUVZ_qCdnZ2d@mchsi.com>, "William R.
>>> Walsh" <newsgroups1@idontwantjunqueemail.walshcomptech.com> wrote:
>>>>Hello all...
>>>>
>>>>I recently dug up an old JC Penney MCS 2230 integrated stereo, and I'd
>>>>like to get the turntable going again. (Despite the source, it's a
>>>>pretty nice stereo system...the radio tuner works well, it seems to
>>>>have about a 40Wx2 output power rating (which seems reasonable, having
>>>>looked at the internals), the cassette deck is a partial logic design
>>>>with the ability to skip ahead 1, 2 or 3 songs and the turntable
>>>>itself is a linear tracking type.)
>>>>
>>>>Anyway, before I stored it, the turntable was in need of a new belt. I
>>>>set the belt aside and now it seems to be gone. I could have sworn
>>>>that I read about how to determine an unknown belt size in the FAQ,
>>>>but I could not find it just now. As best I remember, a string was
>>>>used and placed around all the components driven by the belt, after
>>>>which a measurement was taken.
>>>
>>> A turntable belt has a lot of stretch to it.
>>
>>Depends on the individual TT. I've seen belts made of rubberized fabric
>>that didn't stretch at all. My old Rek-O-Kut TT had a belt that would
>>not stretcch at all made of some woven vulcanized rubber stuff. Any TT
>>with a heavy platter like the Rek-O is likely to have a stiff belt. Some
>>of the el-cheepo tables with aluminum platter will likely have a more
>>stretchy belt but it's not etched in stone.
>
> The whole idea is isolation. All mine had loose belts. My best Thorens
> TD-125 was stretchy. Had a SME arm to install on it, but sold them both.
>
> greg
Loose and stretchy are different things. The belt on the Rek-O was loose
too and I agree that isolation from the drive is a good idea. A stretchy
belt, with more stretch than what is designed, is not good for speed
stability or drift.
==============================================================================
TOPIC: Looking for PS glitch with Tek scope?
http://groups.google.com/group/sci.electronics.repair/t/ecf659bcc56a1548?hl=en
==============================================================================
== 1 of 2 ==
Date: Fri, Jun 4 2010 3:34 am
From: JW
On Thu, 03 Jun 2010 06:57:56 -0700 Winston <Winston@bigbrother.net> wrote
in Message id: <hu8cd401obc@news3.newsguy.com>:
>On 6/3/2010 1:18 AM, Gary Walters wrote:
>> I have a machine in that I suspect the PS (+24vdc) is sagging under load
>> which is causing all kind of havoc with the digital circuits. The load is
>> brief, so I've not been able to capture it with a DMM.
>>
>> I borrowed a Tek TDS410 digitizing scope. It's quite complex (to me, anyway)
>> and I'm not sure how to view the PS such that I can capture a sagging output.
>
>
>http://www2.tek.com/cmswpt/madetails.lotr?ct=MA&cs=mur&ci=9211&lc=EN
>
>Top of the control panel to the right of the display is the
>'General Purpose' knob. Just to it's right is a button labeled
>'Autoset'. Hang your probe on the power supply and press the
>'Autoset' button. Your scope will now be initialized at a good
>starting point. From there, adjust trigger polarity and level,
>'sweep' speed, memory depth. Bob's your uncle.
>
>If you get into a puzzling situation where you can't see the trace
>or can't get the scope to trigger, just pop the 'Autoset' button
>again and you will be getting good data in no time.
>
>I really like the Tek TDS series. Clearly the user interface was
>designed by an actual scope user rather than just a software
>(Cough Agilent cough) engineer.
Which Agilent scopes are you referring to? I like the 548XX Infiniium
series...
== 2 of 2 ==
Date: Fri, Jun 4 2010 6:56 am
From: Winston
On 6/4/2010 3:34 AM, JW wrote:
> On Thu, 03 Jun 2010 06:57:56 -0700 Winston<Winston@bigbrother.net> wrote
> in Message id:<hu8cd401obc@news3.newsguy.com>:
(...)
>> I really like the Tek TDS series. Clearly the user interface was
>> designed by an actual scope user rather than just a software
>> (Cough Agilent cough) engineer.
>
> Which Agilent scopes are you referring to? I like the 548XX Infiniium
> series...
Can't recall the model number. It was a fancy 4 - channel color DSO.
Looked very similar to:
http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL&ckey=126226&lc=eng&cc=US&nfr=-536900125.0.00&pselect=SR.General
I found the user interface counter - intuitive because some of the
controls wouldn't do their function apparent from the labeling.
It was sort of "You can't get there from here."
Perhaps they have improved greatly in the intervening 16 years.
I certainly hope so.
Have you used a TDS? Those are really nice. A very easy migration
to digital storage technology for those of us that started with tube -
type 'recurrent sweep' scopes. Even the 'help' system was easy to
understand and actually had helpful information.
--Winston
==============================================================================
TOPIC: 2000 Lincoln ignition coil problems
http://groups.google.com/group/sci.electronics.repair/t/4681fb0a9d56c3b0?hl=en
==============================================================================
== 1 of 4 ==
Date: Fri, Jun 4 2010 4:27 am
From: klem kedidelhopper
I realize that there are other auto related groups to post this to but
with so many talented techs on this one I thought I give this a try as
well. My son bought a 2000 Lincoln. It has the familiar problem (I'm
told) of oil leaks around the ignition coils and then subsequent
failure of some of those coils. He plans to replace all the oil seals
associated with this but first we cleaned all the coils and I checked
them on the bench with an ohm meter and they all look the same. I
realize of course that this is not conclusive though. These read like
a standard three terminal auto transformer type of device, so can I
assume that they function basically like a standard ignition coil? Can
I apply 12V across the primary momentarily to induce the secondary
field? I have a motor driven interrupter of sorts that would
accomplish this. I read about a procedure on line apparently utilizing
special Ford test equipment, (WDC COP) and it shows oscilloscope
waveforms associated with the coils firing during test. It doesn't
show a procedure or connection diagrams though. I contacted the
manufacturer of the test equipment, Teradyne, but all they would tell
me is that it is Ford test equipment and that the equipment as well as
the procedures are proprietary. I would like to perform a similar test
using my own scope. Has anyone done anything like this? I would
imagine that you could use an inductive pickup similar to the type
found on a timing light placed around the secondary lead. I could wind
a coil if need be. Does anyone know if this would be a viable
procedure, and if so the details of the coil? Thanks, Lenny
== 2 of 4 ==
Date: Fri, Jun 4 2010 4:44 am
From: "N_Cook"
klem kedidelhopper <captainvideo462009@gmail.com> wrote in message
news:f850118a-ec55-486f-9019-9b6efb195340@u26g2000yqu.googlegroups.com...
> I realize that there are other auto related groups to post this to but
> with so many talented techs on this one I thought I give this a try as
> well. My son bought a 2000 Lincoln. It has the familiar problem (I'm
> told) of oil leaks around the ignition coils and then subsequent
> failure of some of those coils. He plans to replace all the oil seals
> associated with this but first we cleaned all the coils and I checked
> them on the bench with an ohm meter and they all look the same. I
> realize of course that this is not conclusive though. These read like
> a standard three terminal auto transformer type of device, so can I
> assume that they function basically like a standard ignition coil? Can
> I apply 12V across the primary momentarily to induce the secondary
> field? I have a motor driven interrupter of sorts that would
> accomplish this. I read about a procedure on line apparently utilizing
> special Ford test equipment, (WDC COP) and it shows oscilloscope
> waveforms associated with the coils firing during test. It doesn't
> show a procedure or connection diagrams though. I contacted the
> manufacturer of the test equipment, Teradyne, but all they would tell
> me is that it is Ford test equipment and that the equipment as well as
> the procedures are proprietary. I would like to perform a similar test
> using my own scope. Has anyone done anything like this? I would
> imagine that you could use an inductive pickup similar to the type
> found on a timing light placed around the secondary lead. I could wind
> a coil if need be. Does anyone know if this would be a viable
> procedure, and if so the details of the coil? Thanks, Lenny
I would have though the usual fault was interlayer discharge within the HV
windings. You can do a simple comparative test with just a neon and 100 Meg
of resistance dropper. Strongest orange discharge glow ok , poor or non
existant glow , bad
== 3 of 4 ==
Date: Fri, Jun 4 2010 6:18 am
From: Jim Yanik
"N_Cook" <diverse@tcp.co.uk> wrote in
news:huaoud$pqq$1@news.eternal-september.org:
> klem kedidelhopper <captainvideo462009@gmail.com> wrote in message
> news:f850118a-ec55-486f-9019-9b6efb195340@u26g2000yqu.googlegroups.com.
> ..
>> I realize that there are other auto related groups to post this to
>> but with so many talented techs on this one I thought I give this a
>> try as well. My son bought a 2000 Lincoln. It has the familiar
>> problem (I'm told) of oil leaks around the ignition coils and then
>> subsequent failure of some of those coils. He plans to replace all
>> the oil seals associated with this but first we cleaned all the coils
>> and I checked them on the bench with an ohm meter and they all look
>> the same. I realize of course that this is not conclusive though.
>> These read like a standard three terminal auto transformer type of
>> device, so can I assume that they function basically like a standard
>> ignition coil? Can I apply 12V across the primary momentarily to
>> induce the secondary field? I have a motor driven interrupter of
>> sorts that would accomplish this. I read about a procedure on line
>> apparently utilizing special Ford test equipment, (WDC COP) and it
>> shows oscilloscope waveforms associated with the coils firing during
>> test. It doesn't show a procedure or connection diagrams though. I
>> contacted the manufacturer of the test equipment, Teradyne, but all
>> they would tell me is that it is Ford test equipment and that the
>> equipment as well as the procedures are proprietary. I would like to
>> perform a similar test using my own scope. Has anyone done anything
>> like this? I would imagine that you could use an inductive pickup
>> similar to the type found on a timing light placed around the
>> secondary lead. I could wind a coil if need be. Does anyone know if
>> this would be a viable procedure, and if so the details of the coil?
>> Thanks, Lenny
>
>
> I would have though the usual fault was interlayer discharge within
> the HV windings. You can do a simple comparative test with just a neon
> and 100 Meg of resistance dropper. Strongest orange discharge glow ok
> , poor or non existant glow , bad
>
>
>
I would think that oil would be an insulator.
It's probably defective coil construction or problem with the plastic
potting,like cracks admitting moisture.
Maybe aftermarket coils would last longer.
If you want to use your o'scope,just lay your scope probe next to the
coil,it will pick up the signal.no need to make any direct connection.
I've done it with flybacks in TEKTRONIX equipment.
If there's a problem,you'll see a clipped waveform.
One more thing to try; Dick Smith's flyback tester.(FBT)
the same guy who created the marvelous DSE(now Anatek) ESR meter.
--
Jim Yanik
jyanik
at
localnet
dot com
== 4 of 4 ==
Date: Fri, Jun 4 2010 6:39 am
From: "tm"
"Jim Yanik" <jyanik@abuse.gov> wrote in message
news:Xns9D8D5EC988853jyaniklocalnetcom@216.168.3.44...
> "N_Cook" <diverse@tcp.co.uk> wrote in
> news:huaoud$pqq$1@news.eternal-september.org:
>
>> klem kedidelhopper <captainvideo462009@gmail.com> wrote in message
>> news:f850118a-ec55-486f-9019-9b6efb195340@u26g2000yqu.googlegroups.com.
>> ..
>>> like this? I would imagine that you could use an inductive pickup
>>> similar to the type found on a timing light placed around the
>>> secondary lead. I could wind a coil if need be. Does anyone know if
>>> this would be a viable procedure, and if so the details of the coil?
>>> Thanks, Lenny
>>
>>
>> I would have though the usual fault was interlayer discharge within
>> the HV windings. You can do a simple comparative test with just a neon
>> and 100 Meg of resistance dropper. Strongest orange discharge glow ok
>> , poor or non existant glow , bad
>>
>>
>>
>
> I would think that oil would be an insulator.
> It's probably defective coil construction or problem with the plastic
> potting,like cracks admitting moisture.
> Maybe aftermarket coils would last longer.
>
>
The easiest thing to do is swap the coils and see if the problem moves
with the coil. I agree with Jim, it is most likely a potting problem and
an aftermarket coil will resolve it.
Tom
==============================================================================
TOPIC: 40Gb Western Digital hard drive
http://groups.google.com/group/sci.electronics.repair/t/d11c27dd9c7d80c0?hl=en
==============================================================================
== 1 of 4 ==
Date: Fri, Jun 4 2010 5:10 am
From: mike
Michael A. Terrell wrote:
>
>
> That reply was to Michael Kennedy. He used to live abut 45 minutes
> from me. He was between me and Orlando. I am in a little better health
> these days, and am almost ready to try the long drive to Orlando. After
> I get the A/C in the truck fixed. :(
Oops, I beg your pardon - anyway, glad to hear you're feeling better.
Anohter Mike
== 2 of 4 ==
Date: Fri, Jun 4 2010 8:11 am
From: "Michael A. Terrell"
mike wrote:
>
> Michael A. Terrell wrote:
>
> >
> >
> > That reply was to Michael Kennedy. He used to live abut 45 minutes
> > from me. He was between me and Orlando. I am in a little better health
> > these days, and am almost ready to try the long drive to Orlando. After
> > I get the A/C in the truck fixed. :(
>
> Oops, I beg your pardon - anyway, glad to hear you're feeling better.
No problem, and thanks. :)
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
== 3 of 4 ==
Date: Fri, Jun 4 2010 10:31 am
From: Jeffrey D Angus
mike wrote:
> On Jun 2, 8:43 pm, Jeff Liebermann <je...@cruzio.com> wrote:
>> Hint: I have a 15 year old Conner CP1060S 1GB drive sitting
>> in my SCO Unix 3.2v4.2 server.
>
> That's pretty amazing, for sure!
Of course the drive is going to last for ever. It's already in
Hell. ;-)
Jeff
--
"Egotism is the anesthetic that dulls the pain of stupidity."
Frank Leahy, Head coach, Notre Dame 1941-1954
== 4 of 4 ==
Date: Fri, Jun 4 2010 12:57 pm
From: Meat Plow
On Fri, 04 Jun 2010 12:31:46 -0500, Jeffrey D Angus ǝʇoɹʍ:
> mike wrote:
>> On Jun 2, 8:43 pm, Jeff Liebermann <je...@cruzio.com> wrote:
>>> Hint: I have a 15 year old Conner CP1060S 1GB drive sitting in my SCO
>>> Unix 3.2v4.2 server.
>>
>> That's pretty amazing, for sure!
>
> Of course the drive is going to last for ever. It's already in Hell. ;-)
>
> Jeff
Seagate Cuda 4.3 gig SCSI in a Compact Prosignia 300, 16 MB built in RAM
running Novell Netware 3.12. Runs 24/7 since 2003. Both the server and
drive are from around mid 90's.
==============================================================================
TOPIC: Sony PS-LX520 Turntable Power Supply Fault
http://groups.google.com/group/sci.electronics.repair/t/8383b4d4bdc7d72a?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 5:41 am
From: "Mark Zacharias"
"William R. Walsh" <newsgroups1@idontwantjunqueemail.walshcomptech.com>
wrote in message news:98OdnSpoGZX3Z5rRnZ2dnUVZ_gGdnZ2d@mchsi.com...
> Hello all...
>
> I recently cleaned up and restored to working order a Sony PS-LX520 linear
> tracking turntable. After that it played beautifully until two nights ago
> when I turned it on and found the "start" control to be unresponsive. As
> it
> turned out, the lights that normally come on to indicate speed and
> playback
> mode were also dead. It had been playing beautifully the night before.
>
> The only sign of life was from the power button and the light bulb that is
> used to tell the turntable how big the record is. The table motor was
> trying
> to run, turning the platter very slowly. No part of the control panel
> works.
>
> I popped it open and had a look inside to see if I could find anything
> obviously wrong. Nothing was obviously distressed. There are three
> different
> boards: one for audio, one for the logic control and a power/speed control
> board. Power comes into the unit from a multi-tapped transformer, and this
> seems to be OK. Markings on the logic circuit board seem to indicate that
> there should be -16 volts, +16 volts and +6 volts from the speed
> control/power board. I have the two sixteen volt supplies and they are
> very
> close to being dead on. The six volt supply is completely missing! Most of
> the connectors are point to point wiring, with the wires placed into
> plastic
> guides and soldered to the board. As they look difficult to remove, I have
> not attempted to see if something is loading down the +6 volt supply.
> Nothing is getting hot.
>
> I have a service manual coming. Already I have been looking at the two
> filter capacitors on the power/speed control board. They are both 25 volt,
> 1000uF units. One holds its charge nicely and long after power off. The
> other one discharges much more quickly, but not quickly enough to make me
> think that a problem is draining it.
>
> Every date code in the unit suggests it was made around the middle of
> 1987.
>
> Has anyone worked on this turntable or a similar model and seen this
> problem?
>
> William
>
>
Not sure it was this model, but they had some problems with 100uF 16 volt
caps shorting on some of these and causing the problem you describe. Might
have also opened an IC protector, IIRC.
Mark Z.
==============================================================================
TOPIC: adidas NBA jersey (http://www.cntrade09.com/)
http://groups.google.com/group/sci.electronics.repair/t/82f5cb0341c10a17?hl=en
==============================================================================
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==============================================================================
TOPIC: Rubber keyboard contact repair
http://groups.google.com/group/sci.electronics.repair/t/61db4df7250c5d17?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 7:40 am
From: "N_Cook"
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:NXTNn.82331$9J1.80992@hurricane...
>
>
> "Gareth Magennis" <sound.service@btconnect.com> wrote in message
> news:wJ-dnQh7OIbG35vRnZ2dnUVZ7tGdnZ2d@bt.com...
> > Hi,
> >
> > anyone geting good results rejuvenating worn keyboard contacts? I'm
> > talking the large ones you find on music keyboards, drum machines etc.
> > Particularly ones where you can't buy the contact rubbers any more ;)
> >
> > I once bought some liquid paint on stuff specifically designed to do
this,
> > it was VERY expensive and didn't work.
> >
> > I am in the UK if that makes a difference.
> >
> >
> > Cheers,
> >
> >
> > Gareth.
> >
>
>
>
> Thanks to all. This is a largeish pad on a Drum Machine. I had a quick
go
> at slicing off part of the knackered pad and slicing off the conductive
> nipple from a keyboard contact strip with a view to gluing some of them
on.
>
> Rapidly came to the conclusion I could not charge a customer money for a
> complete bodge job I could not guarantee to work past next week. This is
> the Start/Stop button which takes a hammering.
>
> One more piece of old toot bites the dust.
>
>
>
>
>
I would have tried woven glass matt reinforced, moulded hotmelt glue sheet ,
with copper or brass gauze patches melted into the rear. Don't know how long
the pcb tracks would survive. Making the reinforced flexible sheet in my
tips files.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm
==============================================================================
TOPIC: Simple hack to get $500 to your home.
http://groups.google.com/group/sci.electronics.repair/t/b0b9cb16ad105ccc?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 9:45 am
From: money mania
Simple hack to get $500 to your home at http://dailyupdatesonly.tk
Due to high security risks,i have hidden the cheque link in an
image. in that website on left side below search box, click on image
and enter your name and address where you want to receive your
cheque.please dont tell to anyone.
==============================================================================
TOPIC: See Hot Sexy Star Aishwarya Nude Bathing Videos In All Angles.
http://groups.google.com/group/sci.electronics.repair/t/fda2aa9fa2e65ed3?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 10:23 am
From: SUKANYA
See Hot Sexy Star Aishwarya Nude Bathing Videos In All Angles.
at http://uslatest.tk
Due to high sex content,i have hidden the videos in an image. in that
website on left side below search box click on image and watch
videos in all angles.please dont tell to anyone.
==============================================================================
TOPIC: Surge Protectors
http://groups.google.com/group/sci.electronics.repair/t/9a42e9c9a84828d9?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 1:03 pm
From: "ian field"
<vjp2.at@at.BioStrategist.dot.dot.com> wrote in message
news:htq3ba$a0r$2@reader1.panix.com...
>
> *+-even the cheap suppressors I've bought had 3 MOVs,one for each leg to
> *+-ground and from one leg to the other. I guess that's a "delta" config.
>
> Do surge supressors exist for two-line phone connections?
Most commercial telecom kit has MOVs but some high end gear has gas
discharge surge suppressors.
Once in a while I've found answering machines with something resembling a
neon bulb where the line lead connects to the PCB.
==============================================================================
TOPIC: More Lies about Monica Pignotti
http://groups.google.com/group/sci.electronics.repair/t/85ffd993406f3bbe?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 3:31 pm
From: Monica Pignotti
On May 29, 8:59 pm, George Orwell <nob...@mixmaster.it> wrote:
> MonicaPignottiis working as a substitute teacher.
>
> She continues, without much success, her Craigslist sex ad business:
>
> http://practitionersofquackery.wordpress.com/2009/09/04/is-there-hope...
>
> http://completedisclosure.wordpress.com/2010/05/14/monica-pignotti-ma...
>
> http://virtualsodium.wordpress.com/2010/05/23/monica-pignotti-88-post...
>
More lies about me. I have never had a "Craigslist sex ad business". I
have never ran or responded to any ads at all on Craigslist. I have
been the victim of an impostor who attempted to impersonate me by
answering a Craigslist ad in my name, which resulted in my getting
unsolicited text messages on my cell phone. The matter has been
reported, Craigslist is taking it very seriously, as this is a
criminal matter. My cyber abuser has now crossed the line to what can
now be considered cyber stalking.
Why the smear campaign and all the lies and the lame attempts to
misportray me as mentally unbalanced when I have no history whatsoever
of mental illnesss? Because I have challenged certain therapists who
see themselves as authorities but whose methods are actually regarded
as quite controversial by mainstream mental health professionals. See:
http://phtherapies.wordpress.com/2010/03/29/questions-for-dr-ronald-federici/
http://monicapignotti.wordpress.com/
==============================================================================
TOPIC: RCA chassis ATC010A
http://groups.google.com/group/sci.electronics.repair/t/6ea1ceadfb8a0425?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 4:32 pm
From: Franc Zabkar
On Thu, 03 Jun 2010 11:18:55 -0400, Gary Woodruff
<woodruffrepair@gmail.com> put finger to keyboard and composed:
>Anyone have any suggestions or a print?
A circuit diagram is available here:
http://www.clubdediagramas.com/archivo/televisores-tv-a5/rca-m98/tv-32v434tyx5-x6-ch-atc010apdf-f85913.html
However, you need to register.
... or not?
http://www.bugmenot.com/view/clubdediagramas.com
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
==============================================================================
TOPIC: MC68701 Controller
http://groups.google.com/group/sci.electronics.repair/t/ce2dc0d81d300503?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Jun 4 2010 6:24 pm
From: Stefan Huebner
Hi all,
Does anyone still know the MC68701? It's the EPROM version of the 6801.
It offers a Mode 0 which allows for reading and writing the internal
EPROM - not like the Hitachi 68xx which can be read and written as 27256
with an appropriate adaptor, this beast needs a monitor program run in
mode 0 to work on the EPROM.
Now I have one 68701 left with some special code in it and need to
reverse engineer the serial protocol it talks (there are some codes sent
to another system which couldn't be simulated once we tried, so I need
to know which condition leads to sending them).
I built a small circuit with the 68701, a HCT573 latch, a 2764 with
Motorolas ProBug monitor in it and a HCT138 wired somewhat weird - A12,
A14 and A15 go to A,B and C, while A13 goes to /G1, /G2 is grounded and
G3 goes to E. Which makes a chip select for B000:BFFF on Y7.
But I cannot get the damn thing reading from my EPROM! The data sheet
says clearly that in mode 0, the reset vector is BFFE:BFFF. But my 68701
will never read from any Bxxx addresses for a single cycle!
Switchhing it to mode 2 or 4 for example works. Opposite to the 6801,
which fetches the reset address from FFFE:FFFF also in mode 0 (but then
allowing those two addresses to be supplied externally for 2 E-cycles)
the 68701 should read from my EPROM on Bxxx.
Anyone an idea?
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