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Explane the readings when you connect the zener in reverse.Franc,
A second test you can do to check to see whether a zener diode is defective or not is to measure its voltage with a voltmeter of a multimeter (or simply just a voltmeter if you have one.)
In order for this test to work, we must feed voltage to the zener diode in reverse bias in series with a resistor. The voltage must be higher than the rated zener voltage of the zener diode. In the circuit below, we feed the zener diode and a 1K⌠resistor 9 volts from a 9-volt battery. The zener diode is rated for 5.1V, well below the 9 volts, so the test will work wtih this diode. When measuring the voltage across the zener diode, it must measure a voltage near its rated zener voltage.
Zener Diode Voltage Test
If a zener diode reads a voltage near its rated zener voltage, VZ, then it is good.
Open Diode
If the diode reads a much higher voltage, of or near the voltage of the supply voltage feeding it, it is open and, thus, defective. It should be replaced.
Shorted Diode
If the diode is reading a much lower voltage than its rated voltage, such as near 0V, it is shorted internally and, thus, is defective and must be replaced."
What do you think?
I have the same light, if you find a good battery for replacement,Have a Sylvania Model 72032 LED Lite that stopped working.
Did some checking and seems the batteries go bad. http://www.amazon.com/Sylvania-72032-Sensor-Failure-FAILURE/product-reviews/B000KJZNBW
Would like to replace it with a better battery if possible.
Appreciate any tips concerning repair of either the Sylvania Model 72032 LED Lite or LED lites in general.
Thanks
Ken
What readings did you find? Did you also measure the resistance of R?A very good test you can do is to check a zener diode with your multimeter set to the ohmmeter setting.
This is a simple test we can do to check whether it is good, open, or shorted.
Sorry, I can't make anything out of that.Zener markings I could see N1 & A
It looks like this is open circuit.power off R series resistor ~22M Ohms
I'm not sure what you are doing here. You should connect one probe toZener Test with Ohmmeter of Multimeter
Negative Probe on Cathode (Black Strip) ~140 K Ohms
Positive Probe on Cathode (Black Strip) ~167 K Ohms
This is consistent with an open circuited series resistor. The zenerpower on
Vin ~111 V
Vout to 0 V ~200 mV
I'm wondering if there may be a series capacitor whose function it ispower on
Vin ~111 V
Vout to 0 V ~200 mV
This is consistent with an open circuited series resistor. The zener
is not shorted, as per your previous measurement.
That said, I'm surprised that Vin is so high. I can't imagine that the
zener voltage would be more than 10V, so this would mean that the
series resistor would need to drop a lot of voltage. It seems too
small for that kind of wattage. Something doesn't look right to me,
but I can't see the circuit clearly enough (too many components
obscuring the PCB). I don't think I can help you without a circuit
diagram.
Sorry, C2 should be on the AC side of the bridge, not the DC side.I'm wondering if there may be a series capacitor whose function it is
to losslessly reduce the supply voltage ...
C2
bridge 1uF
rectifier 250VAC
______ | | Vin
AC1 o--|~ +|----| |----o-- R --+----+---o Vout
| | | | | |
||>| | ZD1 C
| | | |
AC2 o--|~ -|-----------o-------+----+---o
|----| 0V