Toshiba TV29C90 problem; Image fades to black...

[Phoena Greene]

<peckb13@gmail.com> wrote in message
news:6816c938-afe8-470e-a739-f9891613bf8b@googlegroups.com...

On Friday, June 15, 2001 at 9:37:42 PM UTC-5, Cynthia Criss wrote:
I am trying to find an AT&T 6200 Electronic portable typewriter
instruction
manual. Would anyone know a company that could be contacted regarding
how
to obtain the instruction manual? I have called every small business
sales or repair company in Reno trying to find one, and so far not one
business has carried this line or services this line.

Thanks!

I have a manual for Model 6210 if that would help. I also have the
typewriter, which usually works beautifully, but it is hanging up
sometimes when I turn it on lately, and I can't find out how to get it
going again. Would appreciate it if anyone has any ideas.

Thanks.

I have an idea. Maybe Raeanne was typing on your typewriter when she decided
to suck a big black cock and didn't swallow so black jizz fell in your
typewriter keys.

 

[Allodoxaphobia]

On Tue, 14 Feb 2017 08:17:10 -0800 (PST), peckb13@gmail.com wrote:

On Friday, June 15, 2001 at 9:37:42 PM UTC-5, Cynthia Criss wrote:
I am trying to find an AT&T 6200 Electronic portable typewriter instruction
manual. Would anyone know a company that could be contacted regarding how
to obtain the instruction manual? I have called every small business
sales or repair company in Reno trying to find one, and so far not one
business has carried this line or services this line.

I have a manual for Model 6210 if that would help. I also have the typewriter, which usually works beautifully, but it is hanging up sometimes when I turn it on lately, and I can't find out how to get it going again. Would appreciate it if anyone has any ideas.

HOLY CRAP!!
Do you really believe that feller has been waiting around
for nearly SIXTEEN YEARS to get your reply?????

You google groopers are the bane of usenet.

 

[Cursitor Doom]

On Sun, 19 Mar 2017 16:34:43 +1100, Sylvia Else wrote:

On 18/03/2017 8:27 PM, Sylvia Else wrote:
The smoke escaped from my old oscilloscope today. I've determined that
it came out of R740, to the bottom right of the circuit diagram.

https://www.dropbox.com/s/9053dnyr0izv88r/XAMP.PDF?dl=0

This is because T711 has shorted out.

Not very surprisingly I cannot source a replacement BF472, so I need to
find a substitute.

This is the final X-axis amplifier, so we're not talking high
frequencies. Is it likely to be sensitive to the particular transistor
characteristics?

Sylvia.

Hmm....

They may have supplied a circuit diagram and board layouts in the user
manual, but this thing is clearly not designed to be repaired. There are
multiple wires soldered directly to the boards, including some of those
from the power transformer, and to the side of the board that's not
readily accessible until after they're been desoldered. How did they
assemble this thing? With some kind of right-angled soldering iron?

I'm x-posting this to a more appropriate forum, Sylvia, the guys there
will be better able to assist you with this...

 

[jfeng@my-deja.com]

On Sunday, March 19, 2017 at 7:16:33 AM UTC-7, Cursitor Doom wrote:

On Sun, 19 Mar 2017 16:34:43 +1100, Sylvia Else wrote:

On 18/03/2017 8:27 PM, Sylvia Else wrote:
The smoke escaped from my old oscilloscope today. I've determined that
it came out of R740, to the bottom right of the circuit diagram.

https://www.dropbox.com/s/9053dnyr0izv88r/XAMP.PDF?dl=0

This is because T711 has shorted out.

Not very surprisingly I cannot source a replacement BF472, so I need to
find a substitute.


I would try a MJE350(pnp/300V/500ma/20w/TO-126/hFE=30-240). Anchor Electronics http://anchor-electronics.com/ wants US$0.95 each.

 

[Phil Allison]

jf...@my-deja.com wrote:

Not very surprisingly I cannot source a replacement BF472, so I need to
find a substitute.


I would try a MJE350(pnp/300V/500ma/20w/TO-126/hFE=30-240).
Anchor Electronics http://anchor-electronics.com/ wants US$0.95 each.

** I have already pointed out that Sydney's biggest spare parts dealer( WES components) has the BF470 in stock for under $1.

Sylvia lives in Sydney.


..... Phil

 

[Phil Allison]

Phil Allison wrote:

** I have already pointed out that Sydney's biggest spare parts
dealer( WES Components) has the BF470 in stock for under $1.

** They have the BF472 as well, same price

Sylvia lives in Sydney.




...... Phil

 

[jfeng@my-deja.com]

On Sunday, March 19, 2017 at 6:56:07 PM UTC-7, Phil Allison wrote:

Sylvia lives in Sydney.
..... Phil
That was not obvious to me from the posting in sci.electronics.repair. Where was this information to be found in that posting? And if Sylvia is in British Columbia, Anchor Electronics is a plausible supplier.

 

On Monday, March 20, 2017 at 1:18:00 PM UTC-4, Trevor Wilson wrote:

On 20/03/2017 11:58 AM, Phil Allison wrote:
jf...@my-deja.com wrote:



Not very surprisingly I cannot source a replacement BF472, so
I need to find a substitute.


I would try a MJE350(pnp/300V/500ma/20w/TO-126/hFE=30-240). Anchor
Electronics http://anchor-electronics.com/ wants US$0.95 each.


** I have already pointed out that Sydney's biggest spare parts
dealer( WES components) has the BF470 in stock for under $1.

Sylvia lives in Sydney.


**I am VERY wary about buying anything from WES now. From their shitty
electrolytic caps (Jamicon - horrible things, one batch of 100 I
purchased had a 30% failure rate - I had to recall half a dozen units I
serviced as a precaution) to counterfeit semiconductors, I've been
caught several times. As have some of my colleagues. I readily admit
that small, cheap devices are likely to be fine though. I purchased some
large, Japanese flatpack (two screw mounting types) from WES last year.
Same type as the ones in the amp. It failed during bench testing.
Subsequent tests on replacement devices revealed a breakdown Voltage
(VCEO) of around 90 Volts. The original devices are specc'd at 230
Volts. I ended up using single screw mounted devices (same ratings),
obtained from an accredited supplier. No problems. A mate did battle
with a TV set flyback MOSFET a few years back. After many hours chasing
his tail, I suggested he stop buying WES supplied parts and go to
Element14 for the MOSFET (less than $5.00). Problem solved. WES were
kind enough to refund his money for the dodgy MOSFETs, but not the
considerable amount of wasted time.

Never again. All my electros are sourced from Element14 or RS
Components. Panasonic is my favourite brand. Phenomenally low failure
rate and well priced. That free delivery from RS is very nice. My spend
with WES has fallen dramatically.


--
Trevor Wilson
www.rageaudio.com.au

I learned the hard way about counterfeit semis decades ago. Home stereo amps that would blow up in a week after repair, horiz/HV output transistors shorting on power up, hybrid smps ICs that just didn't work or would cause severe oscillation, vertical output ICs running hot and failing in days, PTV convergence hybrid modules that defied alignment...

Here in the U.S., the only suppliers I trust are DigiKey, Mouser, and B&D Enterprises. I'm sometimes forced to buy parts through AliExpress. These are carefully tested. If one is bad, the batch gets scrapped.

 

[Trevor Wilson]

On 20/03/2017 11:58 AM, Phil Allison wrote:

jf...@my-deja.com wrote:



Not very surprisingly I cannot source a replacement BF472, so
I need to find a substitute.


I would try a MJE350(pnp/300V/500ma/20w/TO-126/hFE=30-240). Anchor
Electronics http://anchor-electronics.com/ wants US$0.95 each.


** I have already pointed out that Sydney's biggest spare parts
dealer( WES components) has the BF470 in stock for under $1.

Sylvia lives in Sydney.

**I am VERY wary about buying anything from WES now. From their shitty
electrolytic caps (Jamicon - horrible things, one batch of 100 I
purchased had a 30% failure rate - I had to recall half a dozen units I
serviced as a precaution) to counterfeit semiconductors, I've been
caught several times. As have some of my colleagues. I readily admit
that small, cheap devices are likely to be fine though. I purchased some
large, Japanese flatpack (two screw mounting types) from WES last year.
Same type as the ones in the amp. It failed during bench testing.
Subsequent tests on replacement devices revealed a breakdown Voltage
(VCEO) of around 90 Volts. The original devices are specc'd at 230
Volts. I ended up using single screw mounted devices (same ratings),
obtained from an accredited supplier. No problems. A mate did battle
with a TV set flyback MOSFET a few years back. After many hours chasing
his tail, I suggested he stop buying WES supplied parts and go to
Element14 for the MOSFET (less than $5.00). Problem solved. WES were
kind enough to refund his money for the dodgy MOSFETs, but not the
considerable amount of wasted time.

Never again. All my electros are sourced from Element14 or RS
Components. Panasonic is my favourite brand. Phenomenally low failure
rate and well priced. That free delivery from RS is very nice. My spend
with WES has fallen dramatically.


--
Trevor Wilson
www.rageaudio.com.au

 

[Trevor Wilson]

On 21/03/2017 4:39 AM, ohger1s@gmail.com wrote:

On Monday, March 20, 2017 at 1:18:00 PM UTC-4, Trevor Wilson wrote:
On 20/03/2017 11:58 AM, Phil Allison wrote:
jf...@my-deja.com wrote:



Not very surprisingly I cannot source a replacement
BF472, so I need to find a substitute.


I would try a MJE350(pnp/300V/500ma/20w/TO-126/hFE=30-240).
Anchor Electronics http://anchor-electronics.com/ wants US$0.95
each.


** I have already pointed out that Sydney's biggest spare parts
dealer( WES components) has the BF470 in stock for under $1.

Sylvia lives in Sydney.


**I am VERY wary about buying anything from WES now. From their
shitty electrolytic caps (Jamicon - horrible things, one batch of
100 I purchased had a 30% failure rate - I had to recall half a
dozen units I serviced as a precaution) to counterfeit
semiconductors, I've been caught several times. As have some of my
colleagues. I readily admit that small, cheap devices are likely to
be fine though. I purchased some large, Japanese flatpack (two
screw mounting types) from WES last year. Same type as the ones in
the amp. It failed during bench testing. Subsequent tests on
replacement devices revealed a breakdown Voltage (VCEO) of around
90 Volts. The original devices are specc'd at 230 Volts. I ended up
using single screw mounted devices (same ratings), obtained from an
accredited supplier. No problems. A mate did battle with a TV set
flyback MOSFET a few years back. After many hours chasing his tail,
I suggested he stop buying WES supplied parts and go to Element14
for the MOSFET (less than $5.00). Problem solved. WES were kind
enough to refund his money for the dodgy MOSFETs, but not the
considerable amount of wasted time.

Never again. All my electros are sourced from Element14 or RS
Components. Panasonic is my favourite brand. Phenomenally low
failure rate and well priced. That free delivery from RS is very
nice. My spend with WES has fallen dramatically.


-- Trevor Wilson www.rageaudio.com.au

I learned the hard way about counterfeit semis decades ago. Home
stereo amps that would blow up in a week after repair, horiz/HV
output transistors shorting on power up, hybrid smps ICs that just
didn't work or would cause severe oscillation, vertical output ICs
running hot and failing in days, PTV convergence hybrid modules that
defied alignment...

Here in the U.S., the only suppliers I trust are DigiKey, Mouser, and
B&D Enterprises. I'm sometimes forced to buy parts through
AliExpress. These are carefully tested. If one is bad, the batch
gets scrapped.

**Phil was the first person to alert me to counterfeit semis here in
Australia.



--
Trevor Wilson
www.rageaudio.com.au

 

[Phil Allison]

Trevor Wilson wrote:

**I am VERY wary about buying anything from WES now. From their shitty
electrolytic caps (Jamicon - horrible things, one batch of 100 I
purchased had a 30% failure rate - I had to recall half a dozen units I
serviced as a precaution)

** I must have bought hundreds of Jamicon electro fromn WES over the last two decades- never had a single faulty one.

to counterfeit semiconductors, I've been
caught several times. As have some of my colleagues.

** WES had a lot of fake TO3 devices - popular ones like MJ15003 and MJ15024 in their stocks. The problem was they were reluctant to admit it or remove them from stock.

The typical attitude of such businesses is " the customer is always wrong ".

I purchased some
large, Japanese flatpack (two screw mounting types) from WES last year.
Same type as the ones in the amp. It failed during bench testing.
Subsequent tests on replacement devices revealed a breakdown Voltage
(VCEO) of around 90 Volts. The original devices are specc'd at 230
Volts.

** That sounds like the big Sanken ones, eg 2SC2922 and 2SC3264 etc.

Never had a bad one of them from WES either.

Recently acquired stock might be different.



.... Phil

 

[Phil Allison]

Trevor Wilson wrote:

**Phil was the first person to alert me to counterfeit semis here in
Australia.

** My god, when was that?

I have been seeing fake MJs since 1980.


..... Phil

 

[Phil Allison]

On Tuesday, March 21, 2017 at 2:38:24 PM UTC+11, Trevor Wilson wrote:

On 21/03/2017 2:28 PM, Phil Allison wrote:
Trevor Wilson wrote:



**Phil was the first person to alert me to counterfeit semis here in
Australia.


** My god, when was that?

I have been seeing fake MJs since 1980.


**A long time ago. I couldn't say when. I buy all my non-Jap semis from
Element14 or RS and have done for a long time. No problems with those guys.

** I bought MJs and Hitachi TO3 mosfets from authorised dealers long before the likes of Farnell & RS arrived here.


..... Phil

 

[Trevor Wilson]

On 21/03/2017 2:28 PM, Phil Allison wrote:

Trevor Wilson wrote:



**Phil was the first person to alert me to counterfeit semis here in
Australia.


** My god, when was that?

I have been seeing fake MJs since 1980.

**A long time ago. I couldn't say when. I buy all my non-Jap semis from
Element14 or RS and have done for a long time. No problems with those guys.


--
Trevor Wilson
www.rageaudio.com.au

 

[Cursitor Doom]

On Tue, 21 Mar 2017 08:34:08 -0700, John Robertson wrote:

You may be able to find your BF472s sourced from India:

http://www.diyaudio.com/forums/solid-state/269984-bf471-472-good-
replacement-2sa1381-2sc3503.html

I did a search and no BF numbers showed up, however they did manufacture
the device recently according to the referenced PDF. You may have luck
tracing the part through CDLI's distribution network. It never hurts to
ask!

Is Indian stuff kosher? Like others here I've had big problems with fake
semis from the far east; voltage regs in particular.

I would also check T710 (BF458) and T707 (BF199) as well though before
ordering anything. A simple gain test should suffice. Try to find a
reliable source for these transistors, there are a lot of Chinese (etc.)
fakes out there!

Oh yes, see above!

Have you upgraded the electrolytic capacitors in your scope? They are
most likely well past their Best-Before date!

They were *all* totally fine! I mean I'm sure they're not as they were
when new, but none of us are. ;-) The fault with that scope (if it's the
one I'm thinking of) turned out to be a diode in the SMPS section that
someone had subbed with an inferior part. It needed a fast recovery diode
and someone had stuck in the first spare diode the could find I'd
imagine. It would have worked fine at 50Hz but this was 20kHz. One of the
guys who posts here spotted it from a photo I posted!

 

[John Robertson]

On 2017/03/19 7:13 AM, Cursitor Doom wrote:

On Sun, 19 Mar 2017 16:34:43 +1100, Sylvia Else wrote:

On 18/03/2017 8:27 PM, Sylvia Else wrote:
The smoke escaped from my old oscilloscope today. I've determined that
it came out of R740, to the bottom right of the circuit diagram.

https://www.dropbox.com/s/9053dnyr0izv88r/XAMP.PDF?dl=0

This is because T711 has shorted out.

Not very surprisingly I cannot source a replacement BF472, so I need to
find a substitute.

This is the final X-axis amplifier, so we're not talking high
frequencies. Is it likely to be sensitive to the particular transistor
characteristics?

Sylvia.

Hmm....

They may have supplied a circuit diagram and board layouts in the user
manual, but this thing is clearly not designed to be repaired. There are
multiple wires soldered directly to the boards, including some of those
from the power transformer, and to the side of the board that's not
readily accessible until after they're been desoldered. How did they
assemble this thing? With some kind of right-angled soldering iron?

I'm x-posting this to a more appropriate forum, Sylvia, the guys there
will be better able to assist you with this...

You may be able to find your BF472s sourced from India:

http://www.diyaudio.com/forums/solid-state/269984-bf471-472-good-replacement-2sa1381-2sc3503.html

I did a search and no BF numbers showed up, however they did manufacture
the device recently according to the referenced PDF. You may have luck
tracing the part through CDLI's distribution network. It never hurts to ask!

I would also check T710 (BF458) and T707 (BF199) as well though before
ordering anything. A simple gain test should suffice. Try to find a
reliable source for these transistors, there are a lot of Chinese (etc.)
fakes out there!

Have you upgraded the electrolytic capacitors in your scope? They are
most likely well past their Best-Before date!

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

I have one myself, just got it recently. Very late and outdated post and I doubt I'll get any response, but how do I hook this thing up? Please help if seen. No instructions.

 

[Michael Black]

On Sat, 1 Apr 2017, tracishepperson@yahoo.com wrote:

I have one myself, just got it recently. Very late and outdated post and I doubt I'll get any response, but how do I hook this thing up? Please help if seen. No instructions.

Well first, you don't reply to a 19 year old post.

Then you just start a thread, not trying to talk to people from decades
ago, or acting like something said then has value now.

YOu make sure the subject header says something related to your problem.

And then in the body of the message, you say something about your problem.

For most of us, we don't see the old messages, since we aren't at google.
So connecting to those messages means nothing. So your own message has to
say as much as is needed.

ANd then maybe you'll get an answer. But maybe not, since it's probably
obscure even 19 years ago. But you aren't likely to get a proper answer
by replying to a 19 year old post.

Michael

 

[Adrian Caspersz]

On 02/04/17 02:08, tracishepperson@yahoo.com wrote:
> I have one myself, just got it recently. Very late and outdated post and I doubt I'll get any response,

There are many many searchable things in google called "Laser Lite Show"

Can you be a bit more specific?

A make AND model number, a link to a photo, etc...

Also advice....

"do not look into laser with remaining eye"

Seriously, you need to read the manual before you go blinding someone.

You/We don't know what power the laser is.

--
Adrian C

 

On Wednesday, May 14, 1997 at 2:00:00 AM UTC-5, Bob Wilson wrote:

I have an Astron RS-35M with a shorted output transisitor. It uses 4 2N3771's
made by Motorola in parallel. My question is: does Astron match output
transistors or will any Motorola 2N3771 balance out OK with the other 3 output
transistors? Thanks
Bob