TECHNET Archives

November 2006

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Mon, 6 Nov 2006 14:48:50 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (124 lines)
Inge,

I already joined and asked the question for you. Here's the reply I got:

 In article <[log in to unmask]>, 
   steve <[log in to unmask]> wrote: 


> I'm hoping that there may be somebody with a 5 channel amplifier
Yamaha 
> DSP A-990.  I like my old machine, 6 years old, a fantastic sound and 
> video  processor. Happened to short the outputs and blew most of the
14 
> power darlington transistors. I have repaired with newer equivalents 
> and all e-c-b voltages are OK, but 5 seconds after start, there is a 
> safety relay that switches power off. I can't figure out why and what 
> the sensors react on. 


Usually looking for a DC offset to protect the speakers. Maybe also 
oscillation. A scope should tell all. 

-- 
*Money isn't everything, but it sure keeps the kids in touch * 


    Dave Plowman        [log in to unmask]           London SW 


Maybe Dave can help you out a little more?

-Steve-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Monday, November 06, 2006 2:00 PM
To: [log in to unmask]
Subject: Re: [TN] NTC:is there a audiofil out there?

Thanks Bruce, I will try that one, seems to be a cosy and useful 'club'
.
I knew I'd get help through TN!  The width of knowledge and wisdom is
immense within this group. Maybe thanks to Mr Yoda?
Inge

----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>; <[log in to unmask]>
Sent: Monday, November 06, 2006 2:57 PM
Subject: RE: [TN] NTC:is there a audiofil out there?


Ingemar -

Throw up a posting on
http://groups.google.com/group/sci.electronics.repair.  You'll have to
register w/the group in order to post, but there's a good chance someone
there will be able to help you out.

Bruce Tostevin


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, November 02, 2006 5:26 PM
To: [log in to unmask]
Subject: [TN] NTC:is there a audiofil out there?

Hi all,
just taking a chance, 1,000 TNetters, among all there may be somebody
with a
5 channel amplifier Yamaha DSP A-990.  I like my old machine, 6 years
old, a fantastic sound and video  processor. Happened to short the
outputs and blew most of the 14 power darlington transistors. I have
repaired with newer equivalents and all e-c-b voltages are OK, but 5
seconds after start, there is a safety relay that switches power off. I
can't figure out why and what the sensors react on. Complicated
electronics. Now I just wonder if someone happen to have such a machine
and if there is also someone who have schematics. Yamaha don't not
respond positively on my request, say they have no service on such a
obsolete amplifier.
Regards
Ingemar Hernefjord
SMW

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing
per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2