Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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Hank Bernbaum <lhbernbaum@gmail.com>: Jun 26 06:43PM -0700

On Saturday, May 27, 2000 at 2:00:00 AM UTC-5, Kurtis Bahr wrote:
 
> > Pioneer Laserdisc Player,
> > Model # CLD-59
> > Manufactured: May 1995
Kurtis, your name keeps coming up regarding old Pioneer Elite Laser Disc Players. I read your advice about cutting the lead for the Varactor diode on the power board of CLD-59 player. I have one of those and just tried to use it but found it wouldn't power on. Checked the onboard fuse which was blown. Removed the power board and unsoldered the Varactor Diode. Would like to know where to purchase a new diode and the specifics as to what I'm looking for (specs of the diode). The one I've removed is black with a yellow stripe on one end and has markings that say KIV 420. Suggestions would be much appreciated. I've gone to the Digikey web site but just don't know what I'm looking for.
Also, any suggestions on where to purchase a replacement fuse?
Thank you.
 
Hank
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ben ford <ben4ord@gmail.com>: Jun 26 09:35AM -0700

On Friday, June 4, 2021 at 3:57:01 AM UTC-5, Phil Allison wrote:
> > down at the same time.
 
> ** +1
 
> .... Phil
Would not have expected to ever find a battery with reversed polarity, but yep,
there it was. Very weak charge, which made sense when I sussed it out .. especially
as it was one of two AA batteries in the device I was using (the other one tested Strong).
I replaced both with different-brand-off-the-shelf-out-of-the-package-pre-tested-verified-fresh-new-batteries.
If the situation happens again, it will be very interesting to try and map the occurrence back to the
device itself, as perhaps it's internal wiring could be the root cause.
And
that
is
all
I
have
to
say
on
that. Cheers mates!
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Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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Lana <56deab52e9dafee876fb964aeb05d12d@example.com>: Jun 25 11:15AM

Hello George,I have all what you are looking for. I bought that Shivaki,M22N, in Dubai ,in 2000)))
Contact me, please if you didn't solve the problem)) cheers,Lana
 
--
For full context, visit https://www.electrondepot.com/repair/shivaki-sv-m22n-vhs-cassette-player-no-instructionss-m-3296358-.htm
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Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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Michael Terrell <terrell.michael.a@gmail.com>: Jun 22 12:29PM -0700

On Thursday, June 1, 2023 at 5:55:14 PM UTC-4, micky wrote:
> antennas. But I can get it on wifi, so I can use recommendations for a
> wifi radio with presets.
 
> And you have all heard about Ring Doorbell videos by now, right?
 
I use this Ocean Digital portable. It has a rechargeable battery, and id WiFi so you can carry it with you.
https://www.ebay.com/itm/154784304738
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Digest for sci.electronics.repair@googlegroups.com - 3 updates in 2 topics

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peter@easthope.ca: Jun 20 02:40PM -0700

Hello again,
 
Is zip-cord legal in Britain?
https://en.wikipedia.org/wiki/Zip-cord
 
I want to send an examination lamp to Ghana where the electrical
system follows Britain.
 
Is the NEMA zip-cord and switch legal in the 220 V system? Rewire?
 
Thx, ... P.
Andy Burns <usenet@andyburns.uk>: Jun 21 06:47AM +0100


> I want to send an examination lamp to Ghana where the electrical
> system follows Britain.
 
> Is the NEMA zip-cord and switch legal in the 220 V system?
 
Single insulated cable like that is "Class 0" and banned in the UK since
1975, it would fail testing.
 
> Rewire?
 
I would.
vjp2.at@at.BioStrategist.dot.dot.com: Jun 21 12:31AM

Have you ever tried to speak to a LIVE person at Verizon about a LAND line?
 
It seems they will continue to provide this service to those who have it, but
not new customers.
 
 
--
Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
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Digest for sci.electronics.repair@googlegroups.com - 3 updates in 1 topic

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vjp2.at@at.BioStrategist.dot.dot.com: Jun 20 01:35PM

I want to put three numbers on one line.
 
I will have outgoing fax and voice modem calls during which I want call
waiting shut off.
 
Does verizon still ofer a service LIKE distinctive ring?
 
 
--
Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
"Peter W." <peterwieck33@gmail.com>: Jun 20 06:37AM -0700

> Does Verizon still offer a service LIKE distinctive ring?
 
Have you asked them? That would be the place to start.
 
Peter Wieck
Melrose Park, PA
KenW <ken1943@invalid.net>: Jun 20 09:49AM -0600

On Tue, 20 Jun 2023 13:35:09 -0000 (UTC),
 
>I will have outgoing fax and voice modem calls during which I want call
>waiting shut off.
 
>Does verizon still ofer a service LIKE distinctive ring?
 
I may be wrong, but I believe that is done in the phone
with the Contacts
 
 
KenW
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john <john_crane_59@yahoo.com>: Jun 18 04:23PM -0700

As it turns out the caps are excellent and the voltages rock steady. Almost unbelievable for a 50 year old device (an HP-9100B).
The 24V supply was for some reason at 31V. I tweaked it down with an adjustment resistor on the cards, and the CRT came up in 12 seconds. Manual says within 20 secs - so it seems fine. Thanks! -John
Jeff Layman <Jeff@invalid.invalid>: Jun 19 10:11AM +0100

On 19/06/2023 00:23, john wrote:
> As it turns out the caps are excellent and the voltages rock steady. Almost unbelievable for a 50 year old device (an HP-9100B).
> The 24V supply was for some reason at 31V. I tweaked it down with an adjustment resistor on the cards, and the CRT came up in 12 seconds. Manual says within 20 secs - so it seems fine. Thanks! -John
 
I spent some time with its successor - the 9810A
(https://www.oldcalculatormuseum.com/hp9810a.html) in early 1972. As
that article notes, it was a choice between the HP and a Wang. The HP
was a great machine, and quite easy to program although I had to get
used to RPN.
 
It was being used in a lab, and my boss used to program it as well. I
well remember one day when he'd spent hours inputting a big program
(IIRC around 1600 steps) when his office phone rang. He left the machine
to answer it, and a few seconds later the student who was with us on a
job experience program came in to use the machine. He didn't check if it
was in use, and just turned it off and on again to do what he wanted. I
never knew my boss had such a vocabulary of swear words, and the student
hid somewhere until the boss had calmed down! Mind you, if he'd only
paid attention and followed the instructions to now and again record on
the magnetic cards what he'd done, he'd not have lost hours of work.
 
--
 
Jeff
"ohg...@gmail.com" <ohger1s@gmail.com>: Jun 19 06:49AM -0700

On Thursday, June 15, 2023 at 1:02:30 PM UTC-4, john wrote:
> Any ideas as to what would cause a CRT to take 10mins to warmup before it displays anything? Maybe old capacitors? This thing is a 55 year old calculator.
 
> -John
 
Does the display suddenly appear nice and bright after 10 minutes of darkness or does it slowly fade to life? Either can be circuit component issues but a slowly appearing image sounds like a very tired CRT. If it's the latter and the machine hasn't been used in many years, then just running it several hours a day will generally perk up a tired CRT.
 
If the image appears suddenly and looks good, then it's most likely a circuit issue. A service manual would be handy in checking to see if the heater voltage and HV appear immediately (the two most likely issues). If all the voltages are good, then you need to scope the grid of the CRT backwards and see where you are losing you video.
"ohg...@gmail.com" <ohger1s@gmail.com>: Jun 19 06:43AM -0700

On Thursday, June 15, 2023 at 3:41:29 PM UTC-4, Amanda Ripanykhazov wrote:
 
> Someone gave me this tv and i pugged it in to test. Suddenly after four days of (the screen) working properly, I connected to cable and the TV cuts out, gives the 6 blinks repeatedly.
 
> But then it turns on again as if everything is normal? And the 6 blinks dont happen (as described on various videos) after the partial or whole-screen shutdown which is the problem when the backlight LED is dying.
 
> Is this 6 red flashes the generalised error message when the TV is in its death throes?
 
This model generally doesn't have any problems with its backlighting (despite what the error code may say), but the main boards are junk. The Sony Android TVs of this era usually have the main board start getting glitchy, then wonky, then they end up dead.
 
There are two large BGAs on these boards and they both need to be reballed (a reflow may buy you time but it's not permanent). A used or "recertified" board will also buy you time, but working Sony Android boards are expensive and not worth the short time they have left.
 
When I take any of these on trade they get recycled without exception.
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Amanda Riphnykhazova <licensedtoquill@gmail.com>: Jun 17 11:26AM -0700

Yes, thanks, that's what I am finding: This morning I was watching it when it went out and the left third of the screen DID go a lot darker before the whole screen died a few seconds later
 
So something IS causing that backlight to malfunction.
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peter@easthope.ca: Jun 14 07:21PM -0700


> I have fixed items like that by inserting a small plastic plug between
> screw and main thread. The plastic deforms without damaging the main
> spindle thread, and securely clamps the spindle.
 
Thanks Arie. If I have to drill out whatever is blocking the setscrew
from having effect, a plastic plug is a good idea to avoid damaging
the thread on the spindle.
 
... P.
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Digest for sci.electronics.repair@googlegroups.com - 4 updates in 3 topics

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peter@easthope.ca: Jun 13 08:38PM -0700

Hello,
 
The focus adjustment knob from a Zeiss surgical microscope is in the
photos here. I'd guess the scope was built in the 1950s or '60s.
http://easthope.ca/ZeissKnob1.jpg
http://easthope.ca/ZeissKnob2.jpg
 
The shorter setscrew here was in the knob when I began work on it. The
longer screw is one I made.
http://easthope.ca/ZeissSetscrew.jpg
 
The knob threads onto the focus adjustment spindle. The female thread
in the knob is visible in the photos.
 
Tightening the knob on the spindle increases tension on a clutch to
prevent the head of the scope from sliding out of focus.
 
Tightening the setscrew in the knob should lock it on the spindle to hold
the tension setting but the setscrew has no effect.
 
Obviously the setscrew would spoil the spindle thread by landing
directly on it. The setscrew must push on an intermediate part with a
thread matching the spindle. I don't understand why it doesn't work.
The longer setscrew is still too short?
 
Not an electronic problem but similar knobs were used on some vintage
high end electronic equipment.
 
Ideas?
 
Thanks, ... Peter E.
Arie de Muijnck <noreply@ademu.com>: Jun 14 03:56PM +0200

> high end electronic equipment.
 
> Ideas?
 
> Thanks, ... Peter E.
 
I have fixed items like that by inserting a small plastic plug between
screw and main thread. The plastic deforms without damaging the main
spindle thread, and securely clamps the spindle.
 
Arie
Ed <8020b7b5b36b33912d8f53417ef10944@example.com>: Jun 14 12:00AM

Hi Sparkey, I have a Bose Wave Radio model no AWRC1G and I am looking for an electronic schematic. Were you able to locate one?
Thanks
 
--
For full context, visit https://www.electrondepot.com/repair/need-schematic-bose-acoustic-wave-awrc1g-137107-.htm
Ed <8020b7b5b36b33912d8f53417ef10944@example.com>: Jun 14 12:00AM

Afra, can you supply me with a schematic diagram for a Bose AWRC1G wave radio?
Ed
 
--
For full context, visit https://www.electrondepot.com/repair/bose-radio-model-awrc1g-schematic-15854-.htm
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Bob F <bobnospam@gmail.com>: Jun 10 11:17AM -0700

On 6/10/2023 5:52 AM, whit3rd wrote:
 
> Circuit breakers should, and generally do, fail in safe ways.
> Go ahead and use them without applying a stress test beyond normal
> currents and voltages.
 
If the breakers trip using a heater, then the setting of the welder (AC)
output current will not represent the current that the breaker actually
would trip at on line voltage, because the welder voltage likely will be
lower
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whit3rd <whit3rd@gmail.com>: Jun 10 05:52AM -0700

On Sunday, June 4, 2023 at 9:50:55 PM UTC-4, bob prohaska wrote:
> and would like to check them to see if they trip correctly. They
> were in use before I got them, so they certainly close correctly,
> but it's unknown if they trip correctly.
 
If they're thermal breakers, the only part that can fail while retaining
the on/off function is a heater. A welder intended to melt metal
applied to a heater is... maybe not a test that should be applied.
 
The heater, if it fails open, won't let the breaker pass current.
If it fails closed circuit... there's extra metal inside the breaker?
 
Circuit breakers should, and generally do, fail in safe ways.
Go ahead and use them without applying a stress test beyond normal
currents and voltages.
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bob prohaska <bp@www.zefox.net>: Jun 05 01:50AM

I've been given a collection of residential service panel breakers
and would like to check them to see if they trip correctly. They
were in use before I got them, so they certainly close correctly,
but it's unknown if they trip correctly.
 
As it happens, I have an AC arc welder which can be set between
about 20 and 200 amps, with an open circuit voltage of about 80 V.
 
Anybody ever tried this? Does it seem an unrealistically harsh
test?
 
Thanks for reading,
 
bob prohaska
Phil Allison <pallison49@gmail.com>: Jun 04 11:01PM -0700

bob prohaska wrote:
--------------------------------
> about 20 and 200 amps, with an open circuit voltage of about 80 V.
 
> Anybody ever tried this? Does it seem an unrealistically harsh
> test?
 
** Nope - such breakers are rated to open instantly with fault currents in the thousands of amps.
At rated current they will take a while, maybe 20 minutes, since the trip mechanism is thermal rather than magnetic.
FYI:
A neat, low cost test is to connect an electro cap of about 100uF / 400V with a 6 amp series diode across the output.
The peak surge should trip the breaker pronto.
 
 
...... Phil
Chris Jones <lugnut808@spam.yahoo.com>: Jun 05 09:17PM +1000

On 5/06/2023 11:50 am, bob prohaska wrote:
 
> Thanks for reading,
 
> bob prohaska
 
At least traditional welders (line frequency not switched mode) look
very inductive, and are designed to sustain an arc. Whilst I would hope
that the circuit breakers are able to break the arc, it is a much
harsher test than with a resistive load. If the welder is able to
sustain an arc after the circuit breaker opens, then this will destroy
the breaker.
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Tim Shoemaker <tgs901@gmail.com>: Jun 02 10:09AM -0700

I'm looking for a service manual or schematic for a Radio Shack Pro-29 scanner model 20-509 scanner. I have searched all the usual sites and can only find the owner's manual. If anyone has the service manual pdf I would appreciate a copy of it. Thank you
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