Please your help to recognize a Zener Diode.

[elara]

The element is a Zener Diode and seems to have printed the 272 number on it and was pulled out from the input filter in the primary stage of a VWR1200-D switching power supply board in a Pioneer CLD-99 laserdisc. I was unable to find any detail for this element on the service manual. This element is D4 in layout of board.

I would like to find a replacement exactly the same, but I don't know how to interpret the code that is printed on it. I am not a technician and this is all the information I have about.


Thanks you very much in advance.

[Doug]

1s272 crosses to a nte5191 which is 15v
10watt...I can't tell by the picture what z
Size yours is.

[Tube TV]

Doubt it's 10 watt. It looks like one of those little ones that are smaller than a head on a match. I don't think they can handle that much current.

Let me guess it's failed to a total short?
And its in the secondary low voltage side of the power supply?

Change all the electrolytics before you bother to change it. Also test all the transistors around it for shorts. There's likely something in the same area that failed that overloaded it, and if you just put another one in it will destroy it in a second.

If I recall this is likely part of the low voltage regulation.

Half of the time they are bot marked with any numbers. Usually I just find another one in a PSU that's the same size, used in the same section of a power supply.

[zeno]

Start here.

https://forum.lddb.com/viewtopic.php?f=53&t=9392

If nothing else someone will have the manual & you usually get "good" numbers
to work with.

73 Zeno
LFOD !