[TechAssist] Re: Zener diode test
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 09 Jun 2005 13:15:38 -0500
Look up MTZJ-T-77- in NTE and you'll find a fair selection of various
zeners, the first few on the list, up to 10 volts require a test current
of 20ma and the rest require only 9.5ma or less. Maybe a new battery in
your meter WOULD make a difference. In any case if they are used as a
protection device on the A/V inputs and are not shorted they are
probably not causing any problems.
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
Paul wrote:
> 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 <greentron@xxxxxxx> 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
>>
>>--------------------------------------------------------------------------
>
> ---
>
>>This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
>>Lost Password: http://www.tech-assist.org and select "Login Problems?".
>>Appliance Repair List:
>
> http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>
>>Email Archives: //www.freelists.org/archives/techassist/
>
>
> -----------------------------------------------------------------------------
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app
> Email Archives: //www.freelists.org/archives/techassist/
>
>
>
>
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
> -----------------------------------------------------------------------------
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app
> Email Archives: //www.freelists.org/archives/techassist/
>
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
