Article View: sci.electronics.repair
Article #1273Re: Internal Modem Problem - NO DIALTONE (analogue problem?)
From: David Longley
Date: Wed, 15 Oct 1997 00:00
Date: Wed, 15 Oct 1997 00:00
42 lines
2848 bytes
2848 bytes
In article <3443C73B.4241@www.flash.net>
eklotz@ww.flash.net "Edwrad Klotz" writes:
> David Longley wrote:
> >
> > I have an odd problem with an Internal V34 fax modem, a half
> > length, V1428VQH dynalink I think.
> >
> > The modem is recognized by the PC in DOS, and responds to AT
> > commands with OK and passes diagnostics. The problem is that it
> > never picks up the line and always responds with NO DIALTONE.
> >
> > I've swapped leads and suspect a problem in the analogue side of
> > the board, maybe a relay?
> >
> > Anyone prepared to have a look at the thing for me, or suggest
> > what it might be? I can't afford to get it repaird, these tyhings
> > too cheap for the labour costs these days - but it seems a shame
> > to junk it when all the digital side passes OK. Will pay postage
> > costs of course.
> > --
> > David Longley
> >
> > Longley Consulting London, UK> > Behaviour Assessment & Profiling Technology,
> > Research, Data Analysis and Training Services,
> > Small IT Systems http://www.longley.demon.co.uk> Ive found several of these problems to be an open transformer at the RJ
> plug side. Fine windings (should measure about 50 ohms on both primary
> & secondary. This usually happens after an electrical storm.
> Transformers used to be readily available. Ive used transformers from
> older modems that have close to the same resistance.
> ED
>
I suspect that's EXACTLY what happened - my problem is finding
one. Anyone help?
--
David Longley (check end reply line #)
Longley Consulting London, UK
Behaviour Assessment & Profiling Technology,
Research, Data Analysis and Training Services,
Small IT Systems http://www.longley.demon.co.uk
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10c6a1,ff0d73fc84201cca X-Google-Attributes: gid10c6a1,public X-Google-Thread: 1036bc,ff0d73fc84201cca X-Google-Attributes: gid1036bc,public X-Google-Thread: 1131b0,ff0d73fc84201cca X-Google-Attributes: gid1131b0,public From: David@longley.demon.co.uk (David Longley) Subject: Re: Internal Modem Problem - NO DIALTONE (analogue problem?) Date: 1997/10/15 Message-ID: <876919218snz@longley.demon.co.uk> X-Deja-AN: 280686261 References: <876818758snz@longley.demon.co.uk> <3443C73B.4241@www.flash.net> X-Mail2News-User: David@longley.demon.co.uk X-Complaints-To: abuse@demon.net X-Mail2News-Path: longley.demon.co.uk X-Trace: mail2news.demon.co.uk 876919433 743 David longley.demon.co.uk Organization: Relational Technology Reply-To: David@longley.demon.co.uk# Newsgroups: sci.electronics.repair,demon.tech.pc,comp.periphs