[TechAssist] Re: Zener diode test
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 9 Jun 2005 20:54:59 -0400
The tests you have performed on them have already told you that there is
more to them than the diagram shows. Anyway the question is academic because
they are just protective clamps and if they are not shorted or even left out
the board should still work.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Paul" <dntwntv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, June 09, 2005 4:38 PM
Subject: [TechAssist] Re: Zener diode test
> These were checked out of circuit. The print shows them as a single zener
on each line. The anode side goes to ground.
> Paul
>
> J Silverman <greentron@xxxxxxx> wrote:
> That sounds like 2 zeners in series back to back in one package. They
would
> conduct at approximately 9.1 volts with either polarity.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "Paul"
> To:
> Sent: Thursday, June 09, 2005 2:02 PM
> Subject: [TechAssist] Re: Zener diode test
>
>
> > Yes, I agree. They appear to be just 1/2w Zeners, although very small
> glass cases. I measured a 9.1v, 1w that I had in stock and it measured
fine
> on both meters. Interesting though, I checked to see if they would zener
and
> they do 9.4v. They still don't front to back. How do you figure that?
These
> are in a 2 year old set and are used in the A/V input circuit apparently
as
> protect.
> > Paul
> >
> > Jerome Silverman wrote:
> > Sounds like plain vanilla 9.1 volt zeners. But to answer your question,
> some
> > "zeners" are actually ICs and some have one or more forward biased
diodes
> in
> > series with the zener element and some may consist of two or more zener
> > elements in series.
> > Jerry Silverman
> > Greentron Inc
> > 4 Newland Ave Greenville SC 29609
> > Fax/Phone 864 232 3889
> > greentron@xxxxxxx
> >
> > ----- Original Message -----
> > From: "Paul"
> > To:
> > Sent: Wednesday, June 08, 2005 9:44 PM
> > Subject: [TechAssist] Zener diode test
> >
> >
> > > Are there zener diodes that cannot be measured? I have 4 Sony zeners
P/N
> > MTZJ-T-77-9.1B on a board. They do not cross and I am guessing they are
> 9.1v
> > zeners. They all are either open or they do not measure. Have lifted one
> end
> > and measured with two different meters,Beckman and a Fluke still no
> reading.
> > Can't believe all 4 are open.
> > > Paul
> > >
> > > Paul ,B
> > > Central TV&Video
> > > 911W Grand Ave
> > > Grover Beach Ca.
> > > (805)481-8084
> > >
> >
>
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> >
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> > Paul ,B
> > Central TV&Video
> > 911W Grand Ave
> > Grover Beach Ca.
> > (805)481-8084
> >
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> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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