identify a zener diode
identify a zener diode
(OP)
Hello,
I've got a circut board with what appears
to be a bad zener diode that needs replacing.
is there a way to identify what the diode is or
what a suitable replacement would be?
here is a picture that will hopefully help.
http://www.ghetti.net/rov/diode01.jpg
thanks.
-Ron
I've got a circut board with what appears
to be a bad zener diode that needs replacing.
is there a way to identify what the diode is or
what a suitable replacement would be?
here is a picture that will hopefully help.
http://www.ghetti.net/rov/diode01.jpg
thanks.
-Ron





RE: identify a zener diode
RE: identify a zener diode
I do have access to a known good board though, can you
outline the measurements I need to take?
thanks.
-Ron
RE: identify a zener diode
Measure current ( or VTG accross series R )
These are enough to find replacement.
<nbucska@pcperipherals.com>
RE: identify a zener diode
RE: identify a zener diode
Sadly, this is part of an ignition system
and I get no voltage readings at all with the
unit powered up.
I imagine that the only time I would get a reading
is when the ignition fires.
my guess is that I would only have milliseconds
to take a measurement.
any suggestions ?
thanks.
-Ron
RE: identify a zener diode
RE: identify a zener diode
RE: identify a zener diode
It is most definately a zener diode according to the silk screen on the board.
I currently don't have access to a scope at the moment,
but I do have a decent Fluke 88 dvom although a bit dated, with many functions including min/max, rpm and duty cycle.
where these ignition units seem a bit fragile to me, I hesitate to probe it with the engine running.
-Ron
RE: identify a zener diode
RE: identify a zener diode
If you have a constant current supply feed it with 5ma. If not feed it through a 4K7 resistor from 20volts.
Pass current one way and it should behave as an ordinary diode, ie. you'll get 0.6v across the zener. Reverse the current and measure the voltage again. That will be the zener voltage.
You can get a rough estimate of its wattage rating by comparing its size with others from a catalogue.
RE: identify a zener diode
Identify that and you'll know what zener you need. It looks like a 1Watt zener, so it's probably used for a cheap regulator (is there a series resister connected to it?)
RE: identify a zener diode
+ ----|
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/
\
/
\
/
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30 V DC |----------|
supply -- |
/\
-- meter
| |
|----------|
GND ----|
RE: identify a zener diode
i have a problem! please send me some texts about zener diode!
thanks a lot!
rassul_babapour@hotmail.com
RE: identify a zener diode
Email BobSchmidt@t-online.de