sci.electronics.repair@googlegroups.com

Today's topics:

* Hakko 472 component values? - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/1c9ff9388b00a649?hl=en
* Plasma TV Foggy area - 5 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/9e5cdc2b5ff03be3?hl=en
* Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect - 1
messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/2c5c8a18b92fd995?hl=en
* HP 214B Pulse Generator repair question - 14 messages, 9 authors
http://groups.google.com/group/sci.electronics.repair/t/c99ffb38a259a6ba?hl=en
* Braun TS 45 Electrical Drawings - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b7a2fc2eaea1b67a?hl=en
* Why we have Gravity - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/004d04dfe74c9553?hl=en

==============================================================================
TOPIC: Hakko 472 component values?
http://groups.google.com/group/sci.electronics.repair/t/1c9ff9388b00a649?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Sep 5 2010 11:33 pm
From: DaveC

Have a 473 (uses shop air to create vacuum via venturi) and would like to
retrofit internal vacuum pump to make it essentially a 472.

Have all the guts from 472 and want to stuff empty locations on 472/473 PCB
with components to make it 472-compatible.

Someone with a 472 be willing to convey a few (about 12) component values to
me?

PM me if you do.

Thanks.
Dave
sparkyguy442 (the yahoo place)

== 2 of 2 ==
Date: Mon, Sep 6 2010 3:12 am
From: I AM PROTEUS

On Sep 6, 2:33 am, DaveC <inva...@invalid.net> wrote:
> Have a 473 (uses shop air to create vacuum via venturi) and would like to
> retrofit internal vacuum pump to make it essentially a 472.
>
> Have all the guts from 472 and want to stuff empty locations on 472/473 PCB
> with components to make it 472-compatible.
>
> Someone with a 472 be willing to convey a few (about 12) component values to
> me?
>
> PM me if you do.
>
> Thanks.
> Dave
> sparkyguy442 (the yahoo place)

YOU CROSSPOSTING LAB RAT
GO TO E-BAY OR A SCIENCE GROUP FOR THAT
STOP POSTING VACUUM PRINCIPLE CRAP IN HERE
IT IS OPENING A RIFT TO YOUR ANUS

I AM PROTEUS

==============================================================================
TOPIC: Plasma TV Foggy area
http://groups.google.com/group/sci.electronics.repair/t/9e5cdc2b5ff03be3?hl=en
==============================================================================

== 1 of 5 ==
Date: Mon, Sep 6 2010 4:00 am
From: "Michael Kennedy"

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:D6Lgo.38838$Kp4.11704@newsfe22.ams2...
>
>
> "Mark Zacharias" <mark_zacharias@sbcglobal.net> wrote in message
> news:4c821684$0$6000$c3e8da3@news.astraweb.com...
>> "Michael Kennedy" <mike@nospam.com> wrote in message
>> news:TeydnWj5w-JXjxzRnZ2dnVY3goydnZ2d@giganews.com...
>>>
>>> "Randy Day" <randy.day@sasktel.netx> wrote in message
>>> news:MPG.26eaccdb1b1fd1e19896c0@202.177.16.121...
>>>> In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
>>>> mike@nospam.com says...
>>>>> I don't have this tv in hand now and also don't have the make and
>>>>> model of
>>>>> this display at the moment but all I am looking for is general
>>>>> information
>>>>> for now.
>>>>>
>>>>> This tv has a smudged / blurry area on the screen. It looks almost
>>>>> like it
>>>>> is dirty from a oily hand but it doesn't wipe off. It is not a
>>>>> rectangular
>>>>> area.
>>>>>
>>>>> I am not familar with the common failure modes of Plasma displays.
>>>>> What is
>>>>> your best guess would cause this.
>>>>
>>>> Someone used solvent to clean the screen?
>>>>
>>>
>>> Interesting idea.. That's a case where the screen could be fixed... I
>>> will have a close look at it in a couple of days.
>>> The price is right on this thing, but I don't want to sink money into it
>>> if the screen is about to crap out.. Since that's the one piece that
>>> cant be repaired.
>>>
>>
>> Lets not get ahead of ourselves - do we know for sure it's really a
>> plasma and not an LCD? My customers often confuse the two.
>>
>> If not damage to anti-glare coating which has been suggested, it does
>> sound more like an LCD type problem to me.
>>
>> Mark Z.
>
> To be honest Mark, I'm not sure that as described, it actually sounds like
> any kind of display technology fault that I have seen. I would be
> struggling to think of any kind of LCD problem that would result in an
> irregular smudgy-looking mark, unless it was an actual physical mark on
> the surface of the panel ...
>
> Arfa

Ok I got another look at this TV. It is a Hitachi W32-P5000
Upon close inspection it appears that there is something on the inside of
the front glass.
You can tell by looking closely moving side to side and watching pixels go
from blury to clear

My next question is that is the front glass typically seperate from the
plasma display or is it part of the
display like an LCD tv. If it is indeed seperate it would be an easy fix.
My best guess is
that its seperate but as I said I dont know anything about these and dont
want to drop $160
on something that I cant fix.

By the way, thanks everyone for all of the insight. This group has always
helped me in my
electronic ventures.

== 2 of 5 ==
Date: Mon, Sep 6 2010 5:05 am
From: "Michael Kennedy"

"Michael Kennedy" <mike@nospam.com> wrote in message
news:-cCdnWNTlJ1TUB7RnZ2dnVY3goudnZ2d@giganews.com...
>
> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
> news:D6Lgo.38838$Kp4.11704@newsfe22.ams2...
>>
>>
>> "Mark Zacharias" <mark_zacharias@sbcglobal.net> wrote in message
>> news:4c821684$0$6000$c3e8da3@news.astraweb.com...
>>> "Michael Kennedy" <mike@nospam.com> wrote in message
>>> news:TeydnWj5w-JXjxzRnZ2dnVY3goydnZ2d@giganews.com...
>>>>
>>>> "Randy Day" <randy.day@sasktel.netx> wrote in message
>>>> news:MPG.26eaccdb1b1fd1e19896c0@202.177.16.121...
>>>>> In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
>>>>> mike@nospam.com says...
>>>>>> I don't have this tv in hand now and also don't have the make and
>>>>>> model of
>>>>>> this display at the moment but all I am looking for is general
>>>>>> information
>>>>>> for now.
>>>>>>
>>>>>> This tv has a smudged / blurry area on the screen. It looks almost
>>>>>> like it
>>>>>> is dirty from a oily hand but it doesn't wipe off. It is not a
>>>>>> rectangular
>>>>>> area.
>>>>>>
>>>>>> I am not familar with the common failure modes of Plasma displays.
>>>>>> What is
>>>>>> your best guess would cause this.
>>>>>
>>>>> Someone used solvent to clean the screen?
>>>>>
>>>>
>>>> Interesting idea.. That's a case where the screen could be fixed... I
>>>> will have a close look at it in a couple of days.
>>>> The price is right on this thing, but I don't want to sink money into
>>>> it if the screen is about to crap out.. Since that's the one piece that
>>>> cant be repaired.
>>>>
>>>
>>> Lets not get ahead of ourselves - do we know for sure it's really a
>>> plasma and not an LCD? My customers often confuse the two.
>>>
>>> If not damage to anti-glare coating which has been suggested, it does
>>> sound more like an LCD type problem to me.
>>>
>>> Mark Z.
>>
>> To be honest Mark, I'm not sure that as described, it actually sounds
>> like any kind of display technology fault that I have seen. I would be
>> struggling to think of any kind of LCD problem that would result in an
>> irregular smudgy-looking mark, unless it was an actual physical mark on
>> the surface of the panel ...
>>
>> Arfa
>
> I will let you know if I finally get a chance to see this thing again.. I
> saw it very briefly and it wasn't a major flaw. Had I not been told about
> it, I'm not sure that I would have noticed right off. Seeing it I thought
> it was a very strange fault if electronic, but I haven't seen a plasma
> fail except in getting darker or burn-in. Anyway. . Hopefully I will see
> it tomorrow and solve this mystery.
>

Forgive me if this is a double post. It seems that it didn't work.

I had a closer look at the TV today. It is a Hitachi W32-P5000.
Upon closer inspection it appears that the "fog" is on the inside of the
front glass. I can tell by looking closely and moving side to side. The
pixels were obviously clear and the front glass is fogged.

The next question is that if the front glass is attached to the Plasma
display.
If its not this should be an easy fix.

== 3 of 5 ==
Date: Mon, Sep 6 2010 5:26 am
From: Meat Plow

On Mon, 06 Sep 2010 21:05:34 +0900, Michael Kennedy wrote:

> "Michael Kennedy" <mike@nospam.com> wrote in message
> news:-cCdnWNTlJ1TUB7RnZ2dnVY3goudnZ2d@giganews.com...
>>
>> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
>> news:D6Lgo.38838$Kp4.11704@newsfe22.ams2...
>>>
>>>
>>> "Mark Zacharias" <mark_zacharias@sbcglobal.net> wrote in message
>>> news:4c821684$0$6000$c3e8da3@news.astraweb.com...
>>>> "Michael Kennedy" <mike@nospam.com> wrote in message
>>>> news:TeydnWj5w-JXjxzRnZ2dnVY3goydnZ2d@giganews.com...
>>>>>
>>>>> "Randy Day" <randy.day@sasktel.netx> wrote in message
>>>>> news:MPG.26eaccdb1b1fd1e19896c0@202.177.16.121...
>>>>>> In article <VridnT16DI5klBzRnZ2dnVY3go2dnZ2d@giganews.com>,
>>>>>> mike@nospam.com says...
>>>>>>> I don't have this tv in hand now and also don't have the make and
>>>>>>> model of
>>>>>>> this display at the moment but all I am looking for is general
>>>>>>> information
>>>>>>> for now.
>>>>>>>
>>>>>>> This tv has a smudged / blurry area on the screen. It looks almost
>>>>>>> like it
>>>>>>> is dirty from a oily hand but it doesn't wipe off. It is not a
>>>>>>> rectangular
>>>>>>> area.
>>>>>>>
>>>>>>> I am not familar with the common failure modes of Plasma displays.
>>>>>>> What is
>>>>>>> your best guess would cause this.
>>>>>>
>>>>>> Someone used solvent to clean the screen?
>>>>>>
>>>>>>
>>>>> Interesting idea.. That's a case where the screen could be fixed...
>>>>> I will have a close look at it in a couple of days. The price is
>>>>> right on this thing, but I don't want to sink money into it if the
>>>>> screen is about to crap out.. Since that's the one piece that cant
>>>>> be repaired.
>>>>>
>>>>>
>>>> Lets not get ahead of ourselves - do we know for sure it's really a
>>>> plasma and not an LCD? My customers often confuse the two.
>>>>
>>>> If not damage to anti-glare coating which has been suggested, it does
>>>> sound more like an LCD type problem to me.
>>>>
>>>> Mark Z.
>>>
>>> To be honest Mark, I'm not sure that as described, it actually sounds
>>> like any kind of display technology fault that I have seen. I would be
>>> struggling to think of any kind of LCD problem that would result in an
>>> irregular smudgy-looking mark, unless it was an actual physical mark
>>> on the surface of the panel ...
>>>
>>> Arfa
>>
>> I will let you know if I finally get a chance to see this thing again..
>> I saw it very briefly and it wasn't a major flaw. Had I not been told
>> about it, I'm not sure that I would have noticed right off. Seeing it
>> I thought it was a very strange fault if electronic, but I haven't seen
>> a plasma fail except in getting darker or burn-in. Anyway. . Hopefully
>> I will see it tomorrow and solve this mystery.
>>
>>
> Forgive me if this is a double post. It seems that it didn't work.
>
> I had a closer look at the TV today. It is a Hitachi W32-P5000. Upon
> closer inspection it appears that the "fog" is on the inside of the
> front glass. I can tell by looking closely and moving side to side. The
> pixels were obviously clear and the front glass is fogged.
>
> The next question is that if the front glass is attached to the Plasma
> display.
> If its not this should be an easy fix.

You'd have to get ahold of someone who has either tried to separate the
front glass or who has successfully separated it. This is going to be a
real challenge because it is not something that is normally done. I don't
think I'd toss $160 at the owner either for the chance to find out on my
own.

--
Live Fast, Die Young and Leave a Pretty Corpse

== 4 of 5 ==
Date: Mon, Sep 6 2010 6:10 am
From: "William Sommerwerck"

I'd get in touch with Hitachi today, or tomorrow at the latest (even though
"in touch with tomorrow" was Toshiba's slogan). I'm not so sure this is a
case of the protective front surface pulling away from the panel.

== 5 of 5 ==
Date: Mon, Sep 6 2010 6:45 am
From: Bob Villa

>"Michael Kennedy" <m...@nospam.com> wrote in message
>The next question is that if the front glass is attached to the Plasma
display.
If its not this should be an easy fix

I would pass on this unless you can live with it as it is. I am
definitely no expert but it sounds like and internally caused flaw or
manufacture flaw that was not originally seen by the owner.

==============================================================================
TOPIC: Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply Suspect
http://groups.google.com/group/sci.electronics.repair/t/2c5c8a18b92fd995?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Sep 6 2010 4:44 am
From: Meat Plow

On Sun, 05 Sep 2010 11:10:36 -0700, electronic repair wrote:

> Hello,
>
> I've tried searching this group and looking for relevant information but
> nothing really related to the basic troubleshooting I'm doing for my
> dead Onkyo TX-SV727 Receiver.
>
> <i>BACKSTORY</i> The electricity in my house is pretty janky and my
> stereo may have been shorted out because of that. Basically, my wife
> was listening to music when something happend and she saw the words
> "Protect" come on the display.
>
> <b>TROUBLESHOOTING STEPS TAKEN</b>
> I checked the speaker wires and they had no damage (so that didn't short
> it out). I tried replacing the fuse with several different ones.
> The stereo came with a T 6,3A 125V Fuse, but I could not find that
> specific one in any of the shops here in Portland. I've tried 6A at
> 125V and also 5A at 220V but they all blow within seconds. I've also
> inspected the power supply and there are no obvious scorch marks or
> soder marks that look shorted out.
>
> Please help me figure out what to do next.
>
> Thanks!

Problem with the amplifier is usually suspect if no blown fuses and you
get a Protect warning. Unless you have explicit experience in repairing
consumer audio electronics I strongly recommend you take the unit to a
qualified repair facility.

--
Live Fast, Die Young and Leave a Pretty Corpse

==============================================================================
TOPIC: HP 214B Pulse Generator repair question
http://groups.google.com/group/sci.electronics.repair/t/c99ffb38a259a6ba?hl=en
==============================================================================

== 1 of 14 ==
Date: Mon, Sep 6 2010 6:57 am
From: Richard Rasker

Hello,

I've been asked to fix a special piece of lab equipment, a Hewlett-Packard
214B Pulse Generator, dating back from 1980 or thereabouts.

The problem is relatively straightforward: a chain of components in
the -155V supply has blown:
* PCB fuse F602, value unknown
* Q601 and Q602 (MJ15003)

Since the fuse (F602) has literally exploded, there's no way to determine
its original current rating.

The question of course is what caused this rather convincing supply failure;
the main suspects here are the output tubes V401 and V402-- but I can't see
what types these are either. I have a schematic diagram, but no part list,
so I'm rather stuck.

Does anyone have any experience with these beasties? Or could someone point
me to a service company which may perhaps provide the information on the
fuse and the tubes? AFAICT, it's still a rather expensive piece of
equipment (~$ 6,000), so I really want to try and repair it.

Thanks in advance for any information,

Best regards,

Richard Rasker
--
http://www.linetec.nl

== 2 of 14 ==
Date: Mon, Sep 6 2010 8:03 am
From: J. Todd

In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
spamtrap@linetec.nl says...
> Hello,
>
> I've been asked to fix a special piece of lab equipment, a Hewlett-Packard
> 214B Pulse Generator, dating back from 1980 or thereabouts.
>
> The problem is relatively straightforward: a chain of components in
> the -155V supply has blown:
> * PCB fuse F602, value unknown
> * Q601 and Q602 (MJ15003)
>
> Since the fuse (F602) has literally exploded, there's no way to determine
> its original current rating.
>
> The question of course is what caused this rather convincing supply failure;
> the main suspects here are the output tubes V401 and V402-- but I can't see
> what types these are either. I have a schematic diagram, but no part list,
> so I'm rather stuck.
>
> Does anyone have any experience with these beasties? Or could someone point
> me to a service company which may perhaps provide the information on the
> fuse and the tubes? AFAICT, it's still a rather expensive piece of
> equipment (~$ 6,000), so I really want to try and repair it.
>
> Thanks in advance for any information,
>
> Best regards,
>
> Richard Rasker
>
The manual is on the BAMA site. google BAMA

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

== 3 of 14 ==
Date: Mon, Sep 6 2010 8:29 am
From: Richard Rasker

J. Todd wrote:

> In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
> spamtrap@linetec.nl says...
>> Hello,
>>
[snip Hewlett-Packard 214B Pulse Generator]
...
>> I have a schematic diagram, but no part list, so I'm rather stuck.

...

> The manual is on the BAMA site. google BAMA

Thank you for your swift reply -- but unfortunately, that sites offers the
exact same diagram/manual file I already have. The trouble is that there's
no parts list included, so I can't look up any component values.

So any suggestions are still appreciated :-)

Best regards,

Richard Rasker
--
http://www.linetec.nl

== 4 of 14 ==
Date: Mon, Sep 6 2010 10:25 am
From: Jim Yanik

Richard Rasker <spamtrap@linetec.nl> wrote in
news:4c8508bf$0$729$7ade8c0d@textreader.nntp.internl.net:

> J. Todd wrote:
>
>> In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
>> spamtrap@linetec.nl says...
>>> Hello,
>>>
> [snip Hewlett-Packard 214B Pulse Generator]
> ...
>>> I have a schematic diagram, but no part list, so I'm rather stuck.
>
> ...
>
>> The manual is on the BAMA site. google BAMA
>
> Thank you for your swift reply -- but unfortunately, that sites offers
> the exact same diagram/manual file I already have. The trouble is that
> there's no parts list included, so I can't look up any component
> values.
>
> So any suggestions are still appreciated :-)
>
> Best regards,
>
> Richard Rasker

try this;
http://www.home.agilent.com/agilent/techSupport.jspx?pid=214B%3Aepsg%3Apro&
pageMode=MN&cc=US&lc=eng&pselect=SR.PM-Search%20Results%20-
%20Manuals.Manuals

or;
http://tinyurl.com/2fsq9m8
--
Jim Yanik
jyanik
at
localnet
dot com

== 5 of 14 ==
Date: Mon, Sep 6 2010 10:51 am
From: "Michael A. Terrell"

Richard Rasker wrote:
>
> J. Todd wrote:
>
> > In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
> > spamtrap@linetec.nl says...
> >> Hello,
> >>
> [snip Hewlett-Packard 214B Pulse Generator]
> ...
> >> I have a schematic diagram, but no part list, so I'm rather stuck.
>
> ...
>
> > The manual is on the BAMA site. google BAMA
>
> Thank you for your swift reply -- but unfortunately, that sites offers the
> exact same diagram/manual file I already have. The trouble is that there's
> no parts list included, so I can't look up any component values.
>
> So any suggestions are still appreciated :-)

http://cp.literature.agilent.com/litweb/pdf/00214-90012.pdf might
have what you need.

--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

== 6 of 14 ==
Date: Mon, Sep 6 2010 11:08 am
From: Richard Rasker

Jim Yanik wrote:

> Richard Rasker <spamtrap@linetec.nl> wrote in
> news:4c8508bf$0$729$7ade8c0d@textreader.nntp.internl.net:
>
>> J. Todd wrote:
>>
>>> In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
>>> spamtrap@linetec.nl says...
>>>> Hello,
>>>>
>> [snip Hewlett-Packard 214B Pulse Generator]
>> ...
>>>> I have a schematic diagram, but no part list, so I'm rather stuck.
>>
>> ...
>>
>>> The manual is on the BAMA site. google BAMA
>>
>> Thank you for your swift reply -- but unfortunately, that sites offers
>> the exact same diagram/manual file I already have. The trouble is that
>> there's no parts list included, so I can't look up any component
>> values.
>>
>> So any suggestions are still appreciated :-)
>>
>> Best regards,
>>
>> Richard Rasker
>
> try this;
>
http://www.home.agilent.com/agilent/techSupport.jspx?pid=214B%3Aepsg%3Apro&
> pageMode=MN&cc=US&lc=eng&pselect=SR.PM-Search%20Results%20-
> %20Manuals.Manuals
>
> or;
> http://tinyurl.com/2fsq9m8

Great find, but once again, it doesn't feature a parts list that I can find;
the text also doesn't mention the type or ratings of output tubes or fuse.

I'm afraid that all manuals available on the Internet are based on this
one -- they're eerily alike, especially the front page photo scan is
identical in all cases. I'll try contacting Agilent, but something tells me
that this may well be the only information they have available,
so the outlook isn't particularly favourable :-(

Anyway, thank you for your efforts (mr. Terrell as well).

Richard Rasker
--
http://www.linetec.nl

== 7 of 14 ==
Date: Mon, Sep 6 2010 12:32 pm
From: Bob Pownall

On 9/6/2010 7:57 AM, Richard Rasker wrote:
<snip>
> I have a schematic diagram, but no part list,
> so I'm rather stuck.

I used to work at HP. I'll post to an HP alumni technical list and see
if anybody who used to design / build / support these things responds.

Bob Pownall

== 8 of 14 ==
Date: Mon, Sep 6 2010 2:13 pm
From: whit3rd

On Sep 6, 6:57 am, Richard Rasker <spamt...@linetec.nl> wrote:

> I've been asked to fix a special piece of lab equipment, a Hewlett-Packard
> 214B Pulse Generator, dating back from 1980 or thereabouts.
>
> The problem is relatively straightforward: a chain of components in
> the -155V supply has blown:
> * PCB fuse F602, value unknown
> * Q601 and Q602 (MJ15003)
>
> Since the fuse (F602) has literally exploded, there's no way to determine
> its original current rating.

Look for labels, or silk-screened indications of the fuse type and
rating...
you never know.
It might be possible to analyze the exploded bits, of course.
Collect
them all!

If it helps, MJ15003 is rated for 20A, max. The
safe-operating-area limit is a polygon on log(I)/log(V) paper with
nodes at
[ 20A, 10V], [5A, 50V], [0.5A, 140V].

== 9 of 14 ==
Date: Mon, Sep 6 2010 3:00 pm
From: Meat Plow

On Mon, 06 Sep 2010 14:13:08 -0700, whit3rd wrote:

> On Sep 6, 6:57 am, Richard Rasker <spamt...@linetec.nl> wrote:
>
>> I've been asked to fix a special piece of lab equipment, a
>> Hewlett-Packard 214B Pulse Generator, dating back from 1980 or
>> thereabouts.
>>
>> The problem is relatively straightforward: a chain of components in the
>> -155V supply has blown:
>> * PCB fuse F602, value unknown
>> * Q601 and Q602 (MJ15003)
>>
>> Since the fuse (F602) has literally exploded, there's no way to
>> determine its original current rating.
>
> Look for labels, or silk-screened indications of the fuse type and
> rating...
> you never know.
> It might be possible to analyze the exploded bits, of course. Collect
> them all!
>
> If it helps, MJ15003 is rated for 20A, max. The safe-operating-area
> limit is a polygon on log(I)/log(V) paper with nodes at
> [ 20A, 10V], [5A, 50V], [0.5A, 140V].

I've repaired some old SW radio gear where it was impossible to get
technical data. That never stopped me though. I understood the circuits,
mixers, IF, Hartley osc etc.. and applied what I knew typical values
existed for the circuit to work. Similar to what you suggest. Same with
more recent mosfet power amp from the 80's. Sound Code Systems or SCS.
Couldn't find at the time (too early for the primitive internet search
engines) any service errata. But I knew the parameters of the devices
and what they should spec and effected a repair. The amp is still in
service here. If the OP has a couple blown MJ's and a toasted fuse that
shouldn't require scientific intervention.

--
Live Fast, Die Young and Leave a Pretty Corpse

== 10 of 14 ==
Date: Mon, Sep 6 2010 4:26 pm
From: Jim Yanik

Richard Rasker <spamtrap@linetec.nl> wrote in
news:4c852e0e$0$729$7ade8c0d@textreader.nntp.internl.net:

> Jim Yanik wrote:
>
>> Richard Rasker <spamtrap@linetec.nl> wrote in
>> news:4c8508bf$0$729$7ade8c0d@textreader.nntp.internl.net:
>>
>>> J. Todd wrote:
>>>
>>>> In article <4c84f341$0$729$7ade8c0d@textreader.nntp.internl.net>,
>>>> spamtrap@linetec.nl says...
>>>>> Hello,
>>>>>
>>> [snip Hewlett-Packard 214B Pulse Generator]
>>> ...
>>>>> I have a schematic diagram, but no part list, so I'm rather stuck.
>>>
>>> ...
>>>
>>>> The manual is on the BAMA site. google BAMA
>>>
>>> Thank you for your swift reply -- but unfortunately, that sites
>>> offers the exact same diagram/manual file I already have. The
>>> trouble is that there's no parts list included, so I can't look up
>>> any component values.
>>>
>>> So any suggestions are still appreciated :-)
>>>
>>> Best regards,
>>>
>>> Richard Rasker
>>
>> try this;
>>
> http://www.home.agilent.com/agilent/techSupport.jspx?pid=214B%3Aepsg%3A
> pro&
>> pageMode=MN&cc=US&lc=eng&pselect=SR.PM-Search%20Results%20-
>> %20Manuals.Manuals
>>
>> or;
>> http://tinyurl.com/2fsq9m8
>
> Great find, but once again, it doesn't feature a parts list that I can
> find; the text also doesn't mention the type or ratings of output
> tubes or fuse.
>
> I'm afraid that all manuals available on the Internet are based on
> this one -- they're eerily alike, especially the front page photo scan
> is identical in all cases. I'll try contacting Agilent, but something
> tells me that this may well be the only information they have
> available, so the outlook isn't particularly favourable :-(
>
> Anyway, thank you for your efforts (mr. Terrell as well).
>
> Richard Rasker

maybe these links will help;
http://www.ko4bb.com/Manuals/03)_Manual_and_Test_Equipment_Links.php

good luck.

--
Jim Yanik
jyanik
at
localnet
dot com

== 11 of 14 ==
Date: Mon, Sep 6 2010 5:05 pm
From: Archon

On 9/6/2010 9:57 AM, Richard Rasker wrote:
> Hello,
>
> I've been asked to fix a special piece of lab equipment, a Hewlett-Packard
> 214B Pulse Generator, dating back from 1980 or thereabouts.
>
> The problem is relatively straightforward: a chain of components in
> the -155V supply has blown:
> * PCB fuse F602, value unknown
> * Q601 and Q602 (MJ15003)
>
> Since the fuse (F602) has literally exploded, there's no way to determine
> its original current rating.
>
> The question of course is what caused this rather convincing supply failure;
> the main suspects here are the output tubes V401 and V402-- but I can't see
> what types these are either. I have a schematic diagram, but no part list,
> so I'm rather stuck.
>
> Does anyone have any experience with these beasties? Or could someone point
> me to a service company which may perhaps provide the information on the
> fuse and the tubes? AFAICT, it's still a rather expensive piece of
> equipment (~$ 6,000), so I really want to try and repair it.
>
> Thanks in advance for any information,
>
> Best regards,
>
> Richard Rasker
Artekmedia have the full manual, I guess you can get it as download off
their website if you contact tthem, ( Artekmedia.com ) but its listed
as a CD on Ebay , search # 370162101455

JC

== 12 of 14 ==
Date: Tues, Sep 7 2010 12:27 am
From: Richard Rasker

Meat Plow wrote:

> On Mon, 06 Sep 2010 14:13:08 -0700, whit3rd wrote:
>
>> On Sep 6, 6:57 am, Richard Rasker <spamt...@linetec.nl> wrote:
>>
>>> I've been asked to fix a special piece of lab equipment, a
>>> Hewlett-Packard 214B Pulse Generator, dating back from 1980 or
>>> thereabouts.
>>>
>>> The problem is relatively straightforward: a chain of components in the
>>> -155V supply has blown:
>>> * PCB fuse F602, value unknown
>>> * Q601 and Q602 (MJ15003)
>>>
>>> Since the fuse (F602) has literally exploded, there's no way to
>>> determine its original current rating.
>>
>> Look for labels, or silk-screened indications of the fuse type and
>> rating...
>> you never know.
>> It might be possible to analyze the exploded bits, of course. Collect
>> them all!
>>
>> If it helps, MJ15003 is rated for 20A, max. The safe-operating-area
>> limit is a polygon on log(I)/log(V) paper with nodes at
>> [ 20A, 10V], [5A, 50V], [0.5A, 140V].
>
>
> I've repaired some old SW radio gear where it was impossible to get
> technical data. That never stopped me though. I understood the circuits,
> mixers, IF, Hartley osc etc.. and applied what I knew typical values
> existed for the circuit to work. Similar to what you suggest. Same with
> more recent mosfet power amp from the 80's. Sound Code Systems or SCS.
> Couldn't find at the time (too early for the primitive internet search
> engines) any service errata. But I knew the parameters of the devices
> and what they should spec and effected a repair. The amp is still in
> service here. If the OP has a couple blown MJ's and a toasted fuse that
> shouldn't require scientific intervention.

I'm legally responsible for whatever goes wrong (further damage or injury)
if I put in the wrong parts, most notably fuses. Furthermore, this thing is
used in a university laboratory by quite a number of people, so I really
need to get it right. So in this particular case, guesswork is out of the
question (but if I had to guess, I'd say that the fuse should be something
between 1 and 4 amps, and the tubes look quite similar to PL519's).

Richard Rasker
--
http://www.linetec.nl

== 13 of 14 ==
Date: Tues, Sep 7 2010 12:17 am
From: Richard Rasker

Bob Pownall wrote:

> On 9/6/2010 7:57 AM, Richard Rasker wrote:
> <snip>
> > I have a schematic diagram, but no part list,
>> so I'm rather stuck.
>
> I used to work at HP. I'll post to an HP alumni technical list and see
> if anybody who used to design / build / support these things responds.
>
> Bob Pownall

That would be great, thanks!

Richard Rasker
--
http://www.linetec.nl

== 14 of 14 ==
Date: Tues, Sep 7 2010 12:50 am
From: Jeff Liebermann

On Mon, 06 Sep 2010 17:29:03 +0200, Richard Rasker
<spamtrap@linetec.nl> wrote:

>Thank you for your swift reply -- but unfortunately, that sites offers the
>exact same diagram/manual file I already have. The trouble is that there's
>no parts list included, so I can't look up any component values.
>
>So any suggestions are still appreciated :-)

Try getting it from the Agilent site:
<http://cp.literature.agilent.com/litweb/pdf/00214-90012.pdf>
I'm having a problem downloading it (hangs 25% of the way through) so
I can't tell if it's the same as the one on BAMA.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

==============================================================================
TOPIC: Braun TS 45 Electrical Drawings
http://groups.google.com/group/sci.electronics.repair/t/b7a2fc2eaea1b67a?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Sep 6 2010 1:40 pm
From: aaronlubelski

All colleagues

Need Braun TS 45 receiver Electrical Drawings

appreciate the help in advance, Aaron

--
aaronlubelski

==============================================================================
TOPIC: Why we have Gravity
http://groups.google.com/group/sci.electronics.repair/t/004d04dfe74c9553?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, Sep 6 2010 6:51 pm
From: RichTravsky

"Michael A. Terrell" wrote:
>
> RichTravsky wrote:
> >
> > "Michael A. Terrell" wrote:
> > > RichTravsky wrote:
> > > > Bob Villa wrote:
> > > > ? On Aug 23, 2:50 pm, "Michael A. Terrell" ?mike.terr...@earthlink.net?
> > > > ? wrote:
> > > > ? ? Bob Villa wrote:
> > > > ? ? ? On Aug 23, 12:24 pm, "Michael A. Terrell" ?mike.terr...@earthlink.net?
> > > > ? ? ? wrote:
> > > > ? ? ? ? RichTravsky wrote:
> > > > ? ? ? ? ? fitz wrote:
> > > > ? ?
> > > > ? ? ? ? ? ? Why we have Gravity
> > > > ? ?
> > > > ? ? ? ? ? ? A correct theory of gravity will show us these four (4) things:
> > > > ? ? ? ? ? ? 1. It will show us why gravity also acts like acceleration (principle
> > > > ? ? ? ? ? ? of equvalence).
> > > > ? ? ? ? ? ? 2. It will show us the actual cause of gravity.
> > > > ? ? ? ? ? ? 3. It will show us why gravitational mass and inertial mass are
> > > > ? ? ? ? ? ? identical.
> > > > ? ? ? ? ? ? 4. It will show us the speed of gravitational attraction.
> > > > ? ?
> > > > ? ? ? ? ? ? Newton said gravity was acting at a much faster speed than Einstein.
> > > > ? ?
> > > > ? ? ? ? ? Well, the average running speed of a human is around 10 mph. Sprints, the
> > > > ? ? ? ? ? record is under 30 mph. I don't know how athletic Einstein was so we could
> > > > ? ? ? ? ? use a figure of 3 mph walking speed. Nice to set some lower boundaries
> > > > ? ? ? ? ? on the SoG (speed of gravity).
> > > > ? ?
> > > > ? ? ? ? Slow Old Geezers.
> > > > ? ?
> > > > ? ? ? I resemble that remark!
> > > > ? ?
> > > > ? ? Admitting it is the first step to recovery! ;-)
> > > > ?
> > > > ? There is no recovery...slow, old geezers only get slower.
> > > >
> > > > And older...
> > >
> > > The alternative is worse...
> >
> > There is no alternative. Not really ;)
>
> The alternative is that long 'final nap', underground.

That is the only option, hence, no alternatives.

== 2 of 2 ==
Date: Mon, Sep 6 2010 8:21 pm
From: "Michael A. Terrell"

RichTravsky wrote:
>
> "Michael A. Terrell" wrote:
> >
> > RichTravsky wrote:
> > >
> > > There is no alternative. Not really ;)
> >
> > The alternative is that long 'final nap', underground.
>
> That is the only option, hence, no alternatives.

Keep that thought, if you can. Your time, like every one else is
limited.

--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

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