Do you need help with a problem? All I have seen so far is questions about how to test a zener. If you want to post a model number and symptom and what you know so far maybe someone can help. ******************************** Since 1972 * Jim Myers * Telrad Electronics * Fort Wayne Indiana * ******************************** Paul wrote: > I don't think they are causing problems either after checking for go or no > go. The meters both have relativly new batteries so would be surprised if > that were the cause, but it might be worth a try anyway. This whole thing > came about because this board is NLA per Andrews, where I buy most of my > parts. Another surprise for a 2 year old 32"Sony. However the unhappy > customer called Sony and they told the customer that is was available under > a new number,and further that if they had called an asc he would have known > that. Not sure how the asc would have information that the parts house > dosen't? So I decided I would repair the board and that is where this all > started. Going through the board ran across these odd diodes. The tact > switches on this board cost more than the whole board ready to go. > Paul > Jim Myers <jr.myers@xxxxxxxxxxx> wrote: > 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 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/ > > > > 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?". 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