Digest for sci.electronics.repair@googlegroups.com - 16 updates in 6 topics

Jeff Wisnia <Jwisnia18@DUMPTHIScomcast.net>: Mar 15 12:29PM -0400

Jon Elson wrote:
> each for a nice piece in a plastic housing with 1/4" quick-connect
> terminals, I can get a bare sensor/fuse for $1.50 from Digi-Key.
 
> Jon
 
Yes, I definitely thought about using a heat sink when the thermal fuse
arrives and I solder it in place.
 
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.
Cursitor Doom <curd@notformail.com>: Mar 15 11:05AM

On Mon, 14 Mar 2016 19:58:50 -0500, M Philbrook wrote:

> That will fix itself.
 
> The same is true if you disconnected the battery for a while with the
> other one.
 
I wish. It's been replaced for over 9 months now and it's still the same
as the day it was fitted.
But this is really about trying to rescue the old one. They don't come
cheap!
"pfjw@aol.com" <pfjw@aol.com>: Mar 15 06:21AM -0700

On Tuesday, March 15, 2016 at 7:08:34 AM UTC-4, Cursitor Doom wrote:
 
> as the day it was fitted.
> But this is really about trying to rescue the old one. They don't come
> cheap!
 
Try this:
 
Re-install the new unit. Power up the electrical system, but DO NOT start the engine.
 
Here is the tricky part and be exceedingly careful: While powered up, disconnect the battery, NEGATIVE FIRST. Make sure when that clamp comes off the battery it does so cleanly and quickly. SHORT the positive clamp to the negative clamp immediately and hold for a minimum of 30 seconds. This is the functional equivalent of rebooting the ECU. Shut off the electrical system. Reinstall the battery. Attempt to start. Does this help?
 
Note: If you have any coded devices such as so-called 'infotainment' systems and such, you will have to re-code them. If you have a chip-based navigation system, remove the chip for this process. But, 3 times in 10, it works. Not bad odds if the alternative is landfill.
 
If you have a Bosch unit, this is far more likely to work than if you have a British-made unit.... getting back to that old joke: why do the British drink warm beer?
 
Peter Wieck
Melrose Park, PA
legg <legg@nospam.magma.ca>: Mar 15 09:58AM -0500

On Tue, 15 Mar 2016 11:05:24 -0000 (UTC), Cursitor Doom
>as the day it was fitted.
>But this is really about trying to rescue the old one. They don't come
>cheap!
 
The issue is with the new part, not the old one.
 
Have you mentioned this to the technicians who made the change?
 
RL
Cursitor Doom <curd@notformail.com>: Mar 15 02:03PM

> This is the functional equivalent of rebooting the ECU. Shut off the
> electrical system. Reinstall the battery. Attempt to start. Does this
> help?
 
 
We're getting completely off topic in being distracted by the new EMU,
but I'll just answer this point. Every time I leave that vehicle for a
few days, I'll isolate the battery, anyway. So it has been repeatedly
"rebooted" dozens of times since the old one was replaced.
 
BUT my question is NOT about the new one; it's about how easily the old
ONE can be fixed without schematics (M. Philbrook, many thanks I'll try
your suggestion re xtal).
Cursitor Doom <curd@notformail.com>: Mar 15 02:04PM

On Tue, 15 Mar 2016 09:58:03 -0500, legg wrote:
 
 
>>But this is really about trying to rescue the old one. They don't come
>>cheap!
 
> The issue is with the new part, not the old one.
 
Wrong! The question *solely* concerns the *old* unit that failed.
"pfjw@aol.com" <pfjw@aol.com>: Mar 15 08:24AM -0700

On Tuesday, March 15, 2016 at 10:06:53 AM UTC-4, Cursitor Doom wrote:
 
> BUT my question is NOT about the new one; it's about how easily the old
> ONE can be fixed without schematics (M. Philbrook, many thanks I'll try
> your suggestion re xtal).
 
Whooops! Meant "OLD" unit. Isolating the battery does not constitute a reboot. Shorting the battery leads while the unit capacitors are charged DOES do a reboot. Mere isolation does not. Hence the need to disconnect the battery and short the leads (on the car, not the battery) while the system is energized but the engine not running.
 
Peter Wieck
Melrose Park, PA
Phil Allison <pallison49@gmail.com>: Mar 14 06:31PM -0700

N_Cook wrote:
 
> > belt loop.
 
> > RL
 
> That would be lead to a much closer pair of pulley diameters.
 
** The supposition is nonsense.
 
Where the drive belt is curved, the outside radius is greater - but both flywheels are on the INSIDE of curves.
 
 
.... Phil
makolber@yahoo.com: Mar 15 06:29AM -0700

to the op..
 
 
 
only one pinch roller is engaged at a time, depending upon which direction the tape is traveling?
 
so the two flywheels turn in opposite directions?
 
How do they get the second flywheel to spin in the opposite direction?
 
Maybe that has something to do with the need for a different size?
 
M
"pfjw@aol.com" <pfjw@aol.com>: Mar 15 08:21AM -0700


> Maybe that has something to do with the need for a different size?
 
Mpfffff... Let's get down to it.
 
The most likely reason the two similar-function parts are of a different size is that the physical parameters of the entirety suggested/led to this decision. As neither have *one damned thing* to do with the actual tape speed, the reasons may be no more complex than that.
 
Peter Wieck
Melrose Park, PA
"Gareth Magennis" <soundserviceleeds@outlook.com>: Mar 14 11:50PM

"Cydrome Leader" wrote in message news:nc73cv$hcb$1@reader1.panix.com...
 
> connector, but instead will just take it with it and destroy it, or the
> jack
> tip becomes separated from it's body and is left embedded in the Combi.
 
It's not surprising combination connectors sort of suck in practice. That
jack looks about on par with a chinese travel plug adapter.
 
 
 
 
I think you missed the point.
 
 
The Neutrik Combi works fine usually.
 
Cheap jack plugs don't usually get stuck in any sort of jack socket.
 
Except there are increasing numbers now of cheap jacks that ONLY get stuck
in a Neutrik Combi socket.
 
 
 
Gareth.
N_Cook <diverse@tcp.co.uk>: Mar 15 09:06AM

On 14/03/2016 23:50, Gareth Magennis wrote:
 
> Except there are increasing numbers now of cheap jacks that ONLY get
> stuck in a Neutrik Combi socket.
 
> Gareth.
 
Is the tip connector,in the Neutrik, transverse to the axis of the jack
or parallel to the jack axis?
N_Cook <diverse@tcp.co.uk>: Mar 15 09:11AM

On 14/03/2016 23:50, Gareth Magennis wrote:
 
> Except there are increasing numbers now of cheap jacks that ONLY get
> stuck in a Neutrik Combi socket.
 
> Gareth.
 
This reminds me, last week , another example of wrecked phono sockets on
a powered speaker.
People buy nice gold coloured , gold plated , connectors on blingey
leads and pay over the odds for them. But the phono jacks are crap, the
ground connector is a solid ring, no axial cuts to them, so they jam or
even friction weld to any socket attched to , at some point when
temperature or something is just right
"Gareth Magennis" <soundserviceleeds@outlook.com>: Mar 15 09:11AM

"N_Cook" wrote in message news:nc8j4n$lb$1@dont-email.me...
 
On 14/03/2016 23:50, Gareth Magennis wrote:
 
> Except there are increasing numbers now of cheap jacks that ONLY get
> stuck in a Neutrik Combi socket.
 
> Gareth.
 
Is the tip connector,in the Neutrik, transverse to the axis of the jack
or parallel to the jack axis?
 
 
 
 
 
 
I haven't studied the reasons why these get stuck, other than to observe the
jacks that do seem to have a more triangular tip than usual. (i.e. sharper
angles at the base)
 
 
 
 
I seem to remember reading somewhere that there actually isn't any sort of
International "standard" for 1/4 inch jack plug design.
 
Is this (still) true?
 
Gareth.
Tim R <timothy42b@aol.com>: Mar 14 07:37PM -0700


> Further to this, and in the specific application given, a true O-ring of the correct diameter would serve just as well as a flat "gasket".
 
> Peter Wieck
> Melrose Park, PA
 
I am not a net nazi and I will not correct anybody. But if I use the word O-ring, it probably means the mechanical engineering definition. Your points are well taken.
Phil Allison <pallison49@gmail.com>: Mar 14 06:11PM -0700

Cydrome Leader wrote:
 
> My question is why is on the output of the transformer. Is the input
> fused at all?
 
** The two on/off switch incorporate circuit breakers, but the trannys are very large and the low voltage windings need protecting against an overload or short that would not trip the breakers.
 
 
 
.... Phil
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