J
John Del
Guest
More than one problem???? Is it possible?
)John
)John
S
Sofie
Guest
Nadir:
Sounds to me like basic power supply B+ regulation has failed..... bad
regulator chip, high esr electrolytics, shorted diodes, etc...... a common
high failure part is the STK regulator but the other parts of the circuit
must be tested. Put a meter on the regulated B+ rail and then vary the AC
input voltage with a variac +/- 10 volts to see if the B+ holds steady.
If the problem is not there, then look for faulty screen filtering caps ....
usually low up/high voltage units near and around the flyback...... i.e.
22@250, etc.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------------------------
"Nadir" <zen_nadir@hotmail.com> wrote in message
news:4dde1835.0309152229.55604df3@posting.google.com...
Sounds to me like basic power supply B+ regulation has failed..... bad
regulator chip, high esr electrolytics, shorted diodes, etc...... a common
high failure part is the STK regulator but the other parts of the circuit
must be tested. Put a meter on the regulated B+ rail and then vary the AC
input voltage with a variac +/- 10 volts to see if the B+ holds steady.
If the problem is not there, then look for faulty screen filtering caps ....
usually low up/high voltage units near and around the flyback...... i.e.
22@250, etc.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-------------------------------------------
"Nadir" <zen_nadir@hotmail.com> wrote in message
news:4dde1835.0309152229.55604df3@posting.google.com...
I
Ian Molton
Guest
On 16 Sep 2003 05:38:11 -0700
altomelto@snipp.org (AltoMelto) wrote:
--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux
Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.
altomelto@snipp.org (AltoMelto) wrote:
From your description I'd give up on it. if theres burnt out stuff from the LAN to the PSU its fair to say its f*cked ;-)
--
Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux
Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup.
L
legg
Guest
On 16 Sep 2003 05:38:11 -0700, altomelto@snipp.org (AltoMelto) wrote:
The inverted triangle is an indication of Vishay-Siliconix as a mfr.
The part number Si4425 is a P-channel mosfet with integrated schottky
diode, likely used in pc bus switches or converters.
http://www.vishay.com/doc?71662
This is not a rebranded part. Nobody is trying to give you a hard
time.
Repairing a zapped mother board is something even the OEM mfr would
shy away from - mainly because the possibility of undetected corolary
damage is so high, and the material cost of the motherboard is
relatively low, if a replacement has been inventoried to cover
expected warranty returns.
If an untrained technician has been into it, problems of repair
integrity just get worse.
RL
The board connections strongly suggest a single power mosfet.
The inverted triangle is an indication of Vishay-Siliconix as a mfr.
The part number Si4425 is a P-channel mosfet with integrated schottky
diode, likely used in pc bus switches or converters.
http://www.vishay.com/doc?71662
This is not a rebranded part. Nobody is trying to give you a hard
time.
Repairing a zapped mother board is something even the OEM mfr would
shy away from - mainly because the possibility of undetected corolary
damage is so high, and the material cost of the motherboard is
relatively low, if a replacement has been inventoried to cover
expected warranty returns.
If an untrained technician has been into it, problems of repair
integrity just get worse.
RL
R
Ross Mac
Guest
I did check the supply and it is a good clean 65Volts. All the connections
also look great. Especially for a 25 year old amp. I will look some more
today...thanks...Ross
"Mark D. Zacharias" <mzacharias@nospam.earthlink.net> wrote in message
news:KjB9b.5686$BS5.3989@newsread4.news.pas.earthlink.net...
also look great. Especially for a 25 year old amp. I will look some more
today...thanks...Ross
"Mark D. Zacharias" <mzacharias@nospam.earthlink.net> wrote in message
news:KjB9b.5686$BS5.3989@newsread4.news.pas.earthlink.net...
I don't know - Pioneers are NOTORIOUS for regulated power supply problems.
The timing of his failure also suggests this to me.
Mark Z.
"John Del" <ohger1s@aol.com> wrote in message
news:20030915215847.16504.00001078@mb-m02.aol.com...
Subject: Pioneer SX 1250
From: "Ross Mac" macroeng@att.net
Date: 9/15/03 8:12 PM Eastern Daylight Time
Message-id:
%zs9b.143502$3o3.10289900@bgtnsc05-news.ops.worldnet.att.net
Hi Folks,
I have a Pioneer SX 1250 Reciever that is giving me problems. It shuts
down
after about 30 minutes and the right heatsink seems warmer than the
left.
I
have the service manual and have run a few tests but thought I might
ask
around before I spend the next couple of days fighting this
one......thanks
for any help....Ross
If it plays normally otherwise, I'd bet it's a bias problem. The carbon
trimmers they use to set bias are pure garbage, and they'll drift just
looking
at them. There might be two adjustments per channel on this model.
Flush
them
out with a quality cleaner, and see if they set up normally. If so,
replace
the pure garbage pots with mere crappy ones (one grade up
adjust
the
bias.
John Del
Wolcott, CT
"Nothing is so opportune for tyrants as a people tired of its liberty."
Alan Keyes
(remove S for email reply)
R
Ross Mac
Guest
I will go ahead and calibrate the stabilizer and power amp circuits today.
If the pots are bad I will catch it then. Thanks for all your help....Ross
"John Del" <ohger1s@aol.com> wrote in message
news:20030915215847.16504.00001078@mb-m02.aol.com...
If the pots are bad I will catch it then. Thanks for all your help....Ross
"John Del" <ohger1s@aol.com> wrote in message
news:20030915215847.16504.00001078@mb-m02.aol.com...
Subject: Pioneer SX 1250
From: "Ross Mac" macroeng@att.net
Date: 9/15/03 8:12 PM Eastern Daylight Time
Message-id:
%zs9b.143502$3o3.10289900@bgtnsc05-news.ops.worldnet.att.net
Hi Folks,
I have a Pioneer SX 1250 Reciever that is giving me problems. It shuts
down
after about 30 minutes and the right heatsink seems warmer than the left.
I
have the service manual and have run a few tests but thought I might ask
around before I spend the next couple of days fighting this
one......thanks
for any help....Ross
If it plays normally otherwise, I'd bet it's a bias problem. The carbon
trimmers they use to set bias are pure garbage, and they'll drift just
looking
at them. There might be two adjustments per channel on this model. Flush
them
out with a quality cleaner, and see if they set up normally. If so,
replace
the pure garbage pots with mere crappy ones (one grade up
the
bias.
John Del
Wolcott, CT
"Nothing is so opportune for tyrants as a people tired of its liberty."
Alan Keyes
(remove S for email reply)
J
JW
Guest
On Mon, 15 Sep 2003 23:35:35 +0100 Harry Bloomfield
<harry.m1bytNOSPAM@tiscali.co.uk> wrote in Message id:
<MPG.19d04f0ffc30ce889899a6@news.individual.net>:
Sign up with a valid, non throw-away email address, and you can download
five service and/or operators manuals.
<harry.m1bytNOSPAM@tiscali.co.uk> wrote in Message id:
<MPG.19d04f0ffc30ce889899a6@news.individual.net>:
Some of what you're looking for is here: http://www.teknetelectronics.com/
Sign up with a valid, non throw-away email address, and you can download
five service and/or operators manuals.
H
Harry Bloomfield
Guest
In article <43demv0ojmagu4nvtr53tmbtogpf3c3456@4ax.com>, none@dev.nul
says...
|
| Some of what you're looking for is here: http://www.teknetelectronics.com/
|
| Sign up with a valid, non throw-away email address, and you can download
| five service and/or operators manuals.
|
|
Thanks very much, I managed to download 3 out of the 7 manuals I was
seeking. I am still stuck for the manuals for:-
7854 Main frame
7D15 counter
7B57 T/Base
7CT1N Curve Tracer
--
Regards,
Harry (M1BYT)...
Remove the 'NOSPAM' in my email address to reply.
Free Amateur Radio Courses:-
http://www.ukradioamateur.org
says...
|
| Some of what you're looking for is here: http://www.teknetelectronics.com/
|
| Sign up with a valid, non throw-away email address, and you can download
| five service and/or operators manuals.
|
|
Thanks very much, I managed to download 3 out of the 7 manuals I was
seeking. I am still stuck for the manuals for:-
7854 Main frame
7D15 counter
7B57 T/Base
7CT1N Curve Tracer
--
Regards,
Harry (M1BYT)...
Remove the 'NOSPAM' in my email address to reply.
Free Amateur Radio Courses:-
http://www.ukradioamateur.org
D
David Harris
Guest
sidneybek@yahoo.com (Sidney) wrote in message
Excellent. Now tell me, Sidney, what results did your customers
calls to LG/Zenith yield? I'm serious. I would like to know.
David, on the Illinois prairie.
Excellent. Now tell me, Sidney, what results did your customers
calls to LG/Zenith yield? I'm serious. I would like to know.
David, on the Illinois prairie.
D
David Farber
Guest
I should have asked in my original post what the path is of the signal flow
through this board. At CNS704, only one of the pins has signal and the signal
that is there has some dc offset. There is good signal at test points SL and SR
on the dsp board. I have a schematic on order but in the mean time I was
wondering what type of signals should be present on the input connector to the
rear channel amp board and how they flow through IC701.
Thanks for your reply.
David Farber
David Farber's Service Center
L.A., CA
B
Bob Morein
Guest
"JW" <none@dev.nul> wrote in message
news:h6pdmvk474rmnnrqbs91g8d2r2p5cucci4@4ax.com...
cabinet of a Viewsonic PT-810. I take out five screws, it moves up about
1/3", and gets stuck!
news:h6pdmvk474rmnnrqbs91g8d2r2p5cucci4@4ax.com...
Unfortunately, it doesn't tell me what I need to know -- how to remove the
cabinet of a Viewsonic PT-810. I take out five screws, it moves up about
1/3", and gets stuck!
C
Charlie East
Guest
Just finished a ctc187, After replacing the H-out and regulator, the set
was very intermittent, Done the tuner gnd, then found the 200V to crt board
was high, Replaced the cap and ok(Dont remember what the cap was)
Charlie
"Sofie" <sofie@olypen.com> wrote in message
news:vme66rf755ar4c@corp.supernews.com...
was very intermittent, Done the tuner gnd, then found the 200V to crt board
was high, Replaced the cap and ok(Dont remember what the cap was)
Charlie
"Sofie" <sofie@olypen.com> wrote in message
news:vme66rf755ar4c@corp.supernews.com...
G
gothika
Guest
On Tue, 5 Aug 2003 03:48:30 -0500, "Steve Reinis" <noemail@all.com>
wrote:
We've had dishnetwork for over a year now and as long as we keep the
dish aligned we get a far superior picture to that of digital cable.
While I was on Cox cable it was crap most of the time with pixelation
most of the time and screen lock a constant problem.
Not to mention that they'd down the network for mantaintence around 3
in the morning and no go back online till after 5.
You're poor reception could be a regional problem or a bad dish or
box.
As to the actual signal compression you're getting the same whether
you use analog or digital feed. In fact the analog is pulled of the
digital and converted. The image tends to be softer and easier on the
eye. We've spent most of our viewing life watching analog signal that
that's what we're used to.
It takes a bit of getting used to watching digital, and true if the
signal is weak, poor or corrupted it annoying.
All in all though I prefer it.
wrote:
We've had dishnetwork for over a year now and as long as we keep the
dish aligned we get a far superior picture to that of digital cable.
While I was on Cox cable it was crap most of the time with pixelation
most of the time and screen lock a constant problem.
Not to mention that they'd down the network for mantaintence around 3
in the morning and no go back online till after 5.
You're poor reception could be a regional problem or a bad dish or
box.
As to the actual signal compression you're getting the same whether
you use analog or digital feed. In fact the analog is pulled of the
digital and converted. The image tends to be softer and easier on the
eye. We've spent most of our viewing life watching analog signal that
that's what we're used to.
It takes a bit of getting used to watching digital, and true if the
signal is weak, poor or corrupted it annoying.
All in all though I prefer it.
I get such a kick out of Dish Network and DirecTV always spouting off about
the "100% Digital Picture!" they offer and how it's superior to cable.
Oh please...
It's MPEG video compression. It's lousy most of the time for reasons just
as you described. "Pixelation" is ALWAYS easily spotted when watching
almost any channel, whether or not there is fast action, on my 52" RPTV.
You can still see it on my 27" CRT based set if you look closely, but it's
extremely prominent on the big screen. Watching a car race via DSS
irritates the heck out of me!!
Makes me so glad to still have my old 10' Unimesh dish and "ancient" Tracker
8+ C-band receiver! Sure, I put up with a few sparklies, but when the dish
is tuned properly, I think the signal is FAR superior to that 100% digital
picture from my DishNet receiver.
I guess I'm just picky and want/expect a PERFECT picture in all aspects.
"Bill Webb" <spam@cexx.org> wrote in message
news:bgno0i$2cj$1@slb1.atl.mindspring.net...
Yes, save that analogue test gear. Much like digital TV, us Neanderthals
are here to stay. I've seen every manner of DVD, digital cable, DSS,
DirecTV etc. at friends' and acquaintances' houses. And while they coo
over the stunningly superior digital quality (just as the salesman told
'em
one kind of video artifact for another. The slight film-grain appearance
of VHS and white flecks/stripes of scratched analogue laserdisc (and
munched VHSes) is gone, but replaced by that distilled fuzz around the
transitions of any high-contrast image. The blocky, mottled shadows on
the villian's face that pop in and out of existance. The satellite feed
that shatters into a thousand pieces of colorful screen-vomit everytime
the camera pans too fast. I have to wonder sometimes what the big
attraction is.
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/2003
G
gothika
Guest
On Tue, 05 Aug 2003 07:24:11 -0500, physics-teacher@rooseveltHS.edu
wrote:
I've worked with military grade lasers, ones that CAN really kill you.
There is no way the laser in a dvd player can emit enough energy to
kill anyone directly.
And as far as the radiation goes you'd have to practically stick it in
your eye to get enough to do any harm.
We have this thing called the Underwriters Labaratory that tests all
household appliances.
I doubt that they'd approve any houshold device that could emit even a
near lethal dose of rads without adequate shileding.
You're more likely to get cancer from your microwave.
wrote:
What a load of crap!
I've worked with military grade lasers, ones that CAN really kill you.
There is no way the laser in a dvd player can emit enough energy to
kill anyone directly.
And as far as the radiation goes you'd have to practically stick it in
your eye to get enough to do any harm.
We have this thing called the Underwriters Labaratory that tests all
household appliances.
I doubt that they'd approve any houshold device that could emit even a
near lethal dose of rads without adequate shileding.
You're more likely to get cancer from your microwave.
G
gothika
Guest
On Tue, 5 Aug 2003 14:42:33 +0000 (UTC), "Dave D"
<someone@somewhere.com> wrote:
This isa forum for factual exchange of information not bad "jokes".
Try reading the forum title before posting crappy jokes.
Or better yet go find a forum with humor or jokes in it's title.
Most who come to this forum are here for serious pursuits.
<someone@somewhere.com> wrote:
This isa forum for factual exchange of information not bad "jokes".
Try reading the forum title before posting crappy jokes.
Or better yet go find a forum with humor or jokes in it's title.
Most who come to this forum are here for serious pursuits.
B
Bob Ward
Guest
On Wed, 17 Sep 2003 08:13:06 GMT, gothika <gothika@earthlink.net>
wrote:
And which "forum" would that be, snookums?
wrote:
And which "forum" would that be, snookums?
M
Mark D. Zacharias
Guest
There's lots more than just the 65 volts. Probably + and - 65, 45, 13, etc.
Mark Z.
"Ross Mac" <macroeng@att.net> wrote in message
news:NDF9b.144672$3o3.10359439@bgtnsc05-news.ops.worldnet.att.net...
Mark Z.
"Ross Mac" <macroeng@att.net> wrote in message
news:NDF9b.144672$3o3.10359439@bgtnsc05-news.ops.worldnet.att.net...
I did check the supply and it is a good clean 65Volts. All the connections
also look great. Especially for a 25 year old amp. I will look some more
today...thanks...Ross
"Mark D. Zacharias" <mzacharias@nospam.earthlink.net> wrote in message
news:KjB9b.5686$BS5.3989@newsread4.news.pas.earthlink.net...
I don't know - Pioneers are NOTORIOUS for regulated power supply
problems.
The timing of his failure also suggests this to me.
Mark Z.
"John Del" <ohger1s@aol.com> wrote in message
news:20030915215847.16504.00001078@mb-m02.aol.com...
Subject: Pioneer SX 1250
From: "Ross Mac" macroeng@att.net
Date: 9/15/03 8:12 PM Eastern Daylight Time
Message-id:
%zs9b.143502$3o3.10289900@bgtnsc05-news.ops.worldnet.att.net
Hi Folks,
I have a Pioneer SX 1250 Reciever that is giving me problems. It
shuts
down
after about 30 minutes and the right heatsink seems warmer than the
left.
I
have the service manual and have run a few tests but thought I might
ask
around before I spend the next couple of days fighting this
one......thanks
for any help....Ross
If it plays normally otherwise, I'd bet it's a bias problem. The
carbon
trimmers they use to set bias are pure garbage, and they'll drift just
looking
at them. There might be two adjustments per channel on this model.
Flush
them
out with a quality cleaner, and see if they set up normally. If so,
replace
the pure garbage pots with mere crappy ones (one grade up
adjust
the
bias.
John Del
Wolcott, CT
"Nothing is so opportune for tyrants as a people tired of its
liberty."
Alan Keyes
(remove S for email reply)
S
Sidney
Guest
I am going to start calling many of them and find out and then I will
let all of you know.
let all of you know.
G
Geoffrey S. Mendelson
Guest
In article <br5gmv0bgj1mrv30lbgr6cdll97sj5cpfr@4ax.com>, gothika wrote:
Geoff.
--
Geoffrey S. Mendelson gsm@mendelson.com 972-54-608-069
Icq/AIM Uin: 2661079 MSN IM: geoffrey_mendelson@hotmail.com (Not for email)
Carp are bottom feeders, koi are too, and not surprisingly are ferrets.
It was a good joke a month or so ago.
Geoff.
--
Geoffrey S. Mendelson gsm@mendelson.com 972-54-608-069
Icq/AIM Uin: 2661079 MSN IM: geoffrey_mendelson@hotmail.com (Not for email)
Carp are bottom feeders, koi are too, and not surprisingly are ferrets.
T
Tardz
Guest
Hi I have GS-790 monitor and I'm interested to have a copy of this manual,
it is possible to repost it and where can I download it. Thanks.
"JW" <none@dev.nul> a écrit dans le message de
news:h6pdmvk474rmnnrqbs91g8d2r2p5cucci4@4ax.com...
it is possible to repost it and where can I download it. Thanks.
"JW" <none@dev.nul> a écrit dans le message de
news:h6pdmvk474rmnnrqbs91g8d2r2p5cucci4@4ax.com...