Electronics > Repair

Glass Diode Identification 15PP?

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kishbud:
Cybermaus they certainly do look like those type of caps don't they.

SoundTech-LG:
The diode part# is likely 1S prefix not 15... (many vintage Japanese diodes)  however the letters PP seem very odd.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=1s++diode&_sacat=0&LH_TitleDesc=0&_odkw=1s+germanium+diode&_osacat=0

kishbud:

--- Quote from: Audiorepair on January 23, 2022, 10:13:18 pm ---Zener diodes usually have significantly higher Forward Voltage that standard rectifier diodes.

So if this diode is still working, put your meter in diode mode and measure a few standard diodes you know to be rectifiers.
They usually read in the 500mV to 600 mV ballpark.

A Zener will often read in the 700mV ballpark, making them quite easy to spot.

I would agree with others here that it looks quite likely this is a Zener.

Edit:  You can nearly always measure these Forward Voltages in circuit, so you don't need to remove any of them to test.
Just get a handle on what a normal diode looks like and you will spot the Zener a mile away.

--- End quote ---

Ever since I gave it to another guy to repair, he has pulled some components he felt were thermally compromised as well as the Zener which had numbers printed on it "15PP" but couldn't read without removal. I was under the impression to get the correct breakdown voltages it's best to remove a Zener?

FYI, I thought I would build this Zener identifier I came across from someone else's hard work. Also this link has probably the best Zener identification circuit I've seen yet, I'll probably build one for myself because of the amount of time I burn on this stuff, it will really pay off in the future.

https://content.instructables.com/ORIG/FGS/ZLGC/H1JU4CIV/FGSZLGCH1JU4CIV.pdf

https://content.instructables.com/ORIG/FBE/4WF8/H1JU4CIY/FBE4WF8H1JU4CIY.zip

Zip contains a BRD and SCH file and can be opened with these links.

Attached BRD file opens with http://www.extremecircuits.net/2009/12/eagle-layout-editor-free-download.html

Attached SCH file opens with http://www.fileguru.com/apps/sch_file_viewer

Original link- https://www.instructables.com/Build-a-Zener-Diode-Identifier/

kishbud:

--- Quote from: SoundTech-LG on January 24, 2022, 08:18:37 pm ---The diode part# is likely 1S prefix not 15... (many vintage Japanese diodes)  however the letters PP seem very odd.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=1s++diode&_sacat=0&LH_TitleDesc=0&_odkw=1s+germanium+diode&_osacat=0

--- End quote ---

That's a great observation, unfortunately I'm not in possession of the unit to confirm that, maybe he has a photo from when he removed it, I'll ask. Thanks!

BrokenYugo:
If the zener (assuming it is a zener) is bad I'll hazard a guess it won't breakdown the way it's supposed to (bad diodes usually short out). You'll have to reverse engineer the circuit around it and make an educated guess.

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