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Ziener diode is zeiner diode works on forward biasing

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Yes, Zener diodes can work both on forward and reverse biasing. The primary difference between a zener diode and the ordinary junction diode is it is designed specifically to operate with a reverse bias voltage that is high enough to cause the the device to breakdown and conduct a high reverse current. Hope this answers your question and provides you with some help. If you need further assistance please let me know.

If you do not mind, would you please rate my help. I would very much appreciate it. Thanks

Posted on Dec 08, 2008

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What is the different zener diode and ordinary diode

Posted on Mar 11, 2011

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A conventional solid-state diode will not allow significant current if it is reverse-biased below its reverse breakdown voltage. When the reverse bias breakdown voltage is exceeded, a conventional diode is subject to high current due to avalanche breakdown. Unless this current is limited by external circuitry, the diode will be permanently damaged.

In case of large forward bias (current in the direction of the arrow), the diode exhibits a voltage drop due to its junction built-in voltage and internal resistance. The amount of the voltage drop depends on the semiconductor material and the doping concentrations.

Zener diodes are widely used to regulate the voltage across a circuit. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. From that point it keeps the voltage at that value.

i hope it helps!!!

Posted on Dec 08, 2008

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I thnk No...It will wrk in only reverse bias for voltage regulationn

Posted on Dec 08, 2008

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1 Answer

Do I check WB27X1160 hi-voltage diode as I would a standard diode?


Using a digital meter does not have enough forward bias to test the high voltage diode, in most cases it will short or crack making it easy for the meter to check.

Jul 23, 2012 | GE Microwave Ovens

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Shorted Rectifier Diode (fuse keeps blowing)


jdvillanueva_14.jpg
This CRT tv is dead set, no reaction when the power button is pressed(no standby led light). I've open the back panel and check the faulty parts.
jdvillanueva_15.jpg

As you can see the fuse was badly burnt-out indication of excessive current due to short circuit.
jdvillanueva_17.jpg

I've checked the parts feeding the AC line to the power supply board (Power cord, VDR, Ceramic capacitor, Coil, Posistor, Degaussing coil) one by one and I've found out that one of the four rectifier diode has a leak which caused the glass fuse burnt-out.
Here's how to test the rectifier diode.

Good Diode
Note : Forward and reverse bias depend on what type of ohmmeter are you using, here I'm using a Japan Standard(Sanwa Brand).
jdvillanueva_21.jpg

Using an ohmmeter set it to X10 to see much easier the leak from the diode in reverse bias.

Forward Bias : test the diode by connecting the red test prod of the tester to anode and then the black test prod to cathode of diode. You will see the pointer will reads a faily low resistance(above picture).
jdvillanueva_22.jpg

Reverse Bias : test the diode by connecting the red test prod of the tester to cathode and then the black test prod to anode of diode. You will see at the picture(above) that the pointer didn't react (remains in infinity). This is a good diode.


Bad(leaky) Diode
jdvillanueva_23.jpg

Forward Bias will reads fairly low resistance.
jdvillanueva_24.jpg

Reverse bias unlike the good diode the pointer will also reads a fairly low resistance.

After confirming that the diode caused the fuse from blowing I've decided to replaced all four diodes since I have a lots in my stocks.
jdvillanueva_25.jpg

Remember that when you installing the new diode on the board, make sure that you will make it in the right polarity.

jdvillanueva_26.jpg

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Stevenson

There is a difference between diodes and capacitors. The role of a diode is to rectify and some cases regulate voltages. Meanwhile, a capacitor is there to hold charges. Back to your question, to check an schottky diode, you need an ohmeter with a diode symbol, the reading starts like this .500, .600, .300. 125. still consider good forward bias. .1200 or infinite reverse bias is consider good still. But it shows 0 continuity then that diode is bad. You can also use ohm's law, resistance to also check a diode. Please e-mail me if you some further lesson at Stevebuy31@hotmail.com

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1 Answer

My machine will not read previous dvd's recorded on it


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You can try a cleaning disk, however it has been my experience that the cleaning disk will not help, but it is a good place to start from. More then likely it is a problem with the laser pickup photo-transistor, these often malfunction causing this problem. I would suggest if you are going to try to repair this yourself, you will need a multimeter, a laser meter, and a schematic. The first step is to measure the laser energy leaving the laser diode and see if it matches the specifications in the schematic, if it does not, check the bias voltage with the multimeter, this is to determine if the problem is the bias voltage or the diode itself. If the diode is bad replace it. if the diode is good then the pickup becomes suspect. Using the multimeter measure the bias voltage on the photo-transistor with and without the presence of the laser light from the diode. This will tell you if the photo-transistor is good or bad, if the transistor is bad replace it , if it is good check the components that make up the biasing circuitry.

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I hope this helps,

Thank you,

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1 Answer

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Hello tasman_s

I posted this awhile ago, but I think it may help you:

You can try a cleaning disk, however it has been my experience that the cleaning disk will not help, but it is a good place to start from. More then likely it is a problem with the laser pickup photo-transistor, these often malfunction causing this problem. I would suggest if you are going to try to repair this yourself, you will need a multimeter, a laser meter, and a schematic. The first step is to measure the laser energy leaving the laser diode and see if it matches the specifications in the schematic, if it does not, check the bias voltage with the multimeter, this is to determine if the problem is the bias voltage or the diode itself. If the diode is bad replace it. if the diode is good then the pickup becomes suspect. Using the multimeter measure the bias voltage on the photo-transistor with and without the presence of the laser light from the diode. This will tell you if the photo-transistor is good or bad, if the transistor is bad replace it , if it is good check the components that make up the biasing circuitry.

Now This test will produce a test of go or no-go on the laser diode and the photo-transistor. One of these components or their related biasing circuitry is either bad or about to go bad, by testing the voltages and laser light levels you should be able to determine which one or if both have a problem.

Remember, at least try the cleaning disk first.

I hope this helps,

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1 Answer

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Hello mark85,

I posted this some time ago but I think it can help you, so here it goes:

You can try a cleaning disk, however it has been my experience that the cleaning disk will not help, but it is a good place to start from. More then likely it is a problem with the laser pickup photo-transistor, these often malfunction causing this problem. I would suggest if you are going to try to repair this yourself, you will need a multimeter, a laser meter, and a schematic. The first step is to measure the laser energy leaving the laser diode and see if it matches the specifications in the schematic, if it does not, check the bias voltage with the multimeter, this is to determine if the problem is the bias voltage or the diode itself. If the diode is bad replace it. if the diode is good then the pickup becomes suspect. Using the multimeter measure the bias voltage on the photo-transistor with and without the presence of the laser light from the diode. This will tell you if the photo-transistor is good or bad, if the transistor is bad replace it , if it is good check the components that make up the biasing circuitry.

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I hope this helps,

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2 Answers

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Yes Yes Yes. Before anyone tells you different, Yes. The smoke is supposed to happen when you do that. That is a protection diode that fried. It is there for that reason only. In rare cases, more damage can be done, but about 98% of the time it just fries that diode.

You can take it to any cb shop and have it repaired, just tell them the protection diode was fried. They should only charge between $10 and $15 for it. I charge my customers $10.

If you do not have access to a cb shop and are handy with a soldering iron and desoldering iron, I can walk you through this repair. Just let me know. You can post here or email me at rollincbmods@yahoo.com

Dean
Rollin CBs

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