How would i find the correct zener diode that is cracked, no data sheet on this, it doesnt look like the one next to it? Thanks

[georgeh]

 

[KlausST]

Hi,

I agree, it seems to be a series connection of a zener with a standard Si diode.

Without knowing any information about the circuit it is absolutely impossible for us to give any zener voltage recommendation.

So it's on you to provide informations about the device, the PCB, the function, the circuit...

Klaus

 

[BradtheRad]

The number (or portion of number) might be printed on the component where we can't see it.

Can you use snips or tiny grinding wheel to remove it from the board? Then test its voltage rating out of circuit in case It still functions. (Use caution, sudden shock might break the component further.)

Its size is a clue to the family (possibly 1N47xx for 1W zeners). Some numbers might be on the underside.

 

[FvM]

The small photo cutout gives no indication if this is a zener or rectifier diode. I'd trace the surrounding circuit to decide. Identifier F2 and F3 suggest the neighbours are SMD fuses, so more likely rectifiers.

Maybe you have more information not yet revealed in the post.

 

[georgeh]

Hi,

I agree, it seems to be a series connection of a zener with a standard Si diode.

Without knowing any information about the circuit it is absolutely impossible for us to give any zener voltage recommendation.

So it's on you to provide informations about the device, the PCB, the function, the circuit...

Klaus

Hello Klaus
This is a portable 12v Camera Omni slider 2011 , it is made by Dito Gear. PCB board controls 1 or 2 axis, In my case 1 foreword and back. Speed and Damper along with a LCD Screen
The circuit that goes the cracked diode goes to pin 2 which is a direction Signal with 0V-5V Voltage, the other diode next to that labeled C5V6P ( there are one or two more letters or numbers that I cannot read)
There are 8pins on the controller
Pins 7 and 8 have a Voltage of 10V-15V this controller operates a Buhler Motor GmbH stepper motor. 5 wire Lead
1.61.050.442.03 06.01.11 12:57:00
DC 12 V 116.5 min-1 i=24.7:1
150Ncm 3.5A
This is all I have I have been searching for, a E12 Zener Diode on Electronic Components Datasheet Search and no help. from the photo it doesn't look the same as the cracked one. Thanks for any direction to go next. No response from Company in Poland.
Thanks

 

[BradtheRad]

Your photo shows DE3 DE4. Evidently labelling two diodes. A zener diode often has a label containing the letter Z.

D can label a zener (because it's a diode) although we'd like to find out what convention is used on your board. Look around the board for a label Z or ZD, near a component that appears to be a zener diode. If you find one then it suggests your cracked diode is a plain type.

 

[georgeh]

Your photo shows DE3 DE4. Evidently labelling two diodes. A zener diode often has a label containing the letter Z.

D can label a zener (because it's a diode) although we'd like to find out what convention is used on your board. Look around the board for a label Z or ZD, near a component that appears to be a zener diode. If you find one then it suggests your cracked diode is a plain type.

Hi There are no Z anywhere on board. there are two other diodes DE5 and DE6 both with C5 labled on them.

 

[BradtheRad]

The circuit that goes the cracked diode goes to pin 2 which is a direction Signal with 0V-5V Voltage

On the assumption it's a zener diode, its purpose could be to limit voltage to the device which we assume runs on 5V.

Your board power supply is 12V. Do you see voltage regulator IC's? For 12V?
5V, example, 7805?

 

[KlausST]

Hi,

I see there is a copper trace burnt away.
Now i want to ask:

What was the reason for this huge damage? Did it come without any reason?

Klaus

 

[georgeh]

On the assumption it's a zener diode, its purpose could be to limit voltage to the device which we assume runs on 5V.

Your board power supply is 12V. Do you see voltage regulator IC's? For 12V?
5V, example, 7805?

Hi Yes on the slider where all connections are made, Power, controller there is another PCB with an L7812CV G408CV6 CHN 106

 

[dick_freebird]

A zener diode alone has a positive tempco of Vr, stacking
a regular PN diode with its negative TC will flatten the
overall TC (while adding to net reference voltage).

 

[georgeh]

Hi,

I see there is a copper trace burnt away.
Now i want to ask:

What was the reason for this huge damage? Did it come without any reason?

Klaus

The cable pulled away from connector, or it could of been me sliding the unit back and forth trying to calibrate it. i tried to desolder that outer DE3, DE4 diode and it just fell apart.

 

[georgeh]

The cable pulled away from connector, or it could of been me sliding the unit back and forth trying to calibrate it. i tried to desolder that outer DE3, DE4 diode and it just fell apart.

Im been trying to identify this diode. the identifiers are C5V6P but i cant find them anywhere i think there is 1 more number or letter without removing.

 

[KlausST]

Hi,

It could be a BZX79C5V6 ..

Klaus

 

[georgeh]

Hi,

It could be a BZX79C5V6 ..

Klaus

Do you think i could fry the board if

Hi,

It could be a BZX79C5V6 ..

Klaus

Hi any clue what the P would mean? Even if i take it out, and got the last letter or number i still wouldnt be able to find it? ...right? i live in San Diego Ca. I dont even know who to call.

 

[KlausST]

Do you think i could fry the board if

You already did!

Klaus

 

[FvM]

Any small (400 mW or so) 5.6V Z-diode will fit.

Be aware that Z-diodes are rugged components and don't fail without a reason, e.g. external overvoltage or short circuit. Other components may have been damaged by the respective event, too.

 

[georgeh]

Any small (400 mW or so) 5.6V Z-diode will fit.

Be aware that Z-diodes are rugged components and don't fail without a reason, e.g. external overvoltage or short circuit. Other components may have been damaged by the respective event, too.

--- Updated Nov 26, 2021 ---

OK thanks gonna try that, if all fails buy a 400.00 controller, or trash bin.

 

[dick_freebird]

Is there an un-fried board on which you could measure forward and reverse voltage?

I am still in lined to think the diode might be a plain PN if the intact one is the zener. But in series @ over current the zener would see 8x the Pdiss and fail first, die size and thermals being equal.

Stand that on its head for gross reverse voltage on the stack with a "good ol' 1N914" breaking over at 50V give or take and the zener then being forward and barely warm.

 

[georgeh]

Is there an un-fried board on which you could measure forward and reverse voltage?

I am still in lined to think the diode might be a plain PN if the intact one is the zener. But in series @ over current the zener would see 8x the Pdiss and fail first, die size and thermals being equal.

Stand that on its head for gross reverse voltage on the stack with a "good ol' 1N914" breaking over at 50V give or take and the zener then being forward and barely warm.

Hi Dick_Freebird take a look By the way Thanks