Author Topic: 2SD870 Question  (Read 1022 times)

0 Members and 1 Guest are viewing this topic.

Offline OpenCircuitTopic starter

  • Regular Contributor
  • *
  • Posts: 165
  • Country: us
2SD870 Question
« on: February 09, 2020, 01:59:00 am »
Faulty?









« Last Edit: February 09, 2020, 02:21:39 am by OpenCircuit »
 

Offline floobydust

  • Super Contributor
  • ***
  • Posts: 7681
  • Country: ca
Re: 2SD870 Question
« Reply #1 on: February 09, 2020, 02:14:31 am »
It doesn't look promising.
Why aren't you using diode-test? I have no idea of ohms test current and voltage on UT-61E.
There are six possible readings to look at when testing a tranny.
2SD870 has a built-in EB resistor, and CE damper diode, so those readings would be unexpected.
 
The following users thanked this post: OpenCircuit

Offline OpenCircuitTopic starter

  • Regular Contributor
  • *
  • Posts: 165
  • Country: us
Re: 2SD870 Question
« Reply #2 on: February 09, 2020, 02:21:59 am »
Sorry I updated the images. With ohm test I was diagnosing a blown fuse.
« Last Edit: February 09, 2020, 05:14:59 am by OpenCircuit »
 

Offline floobydust

  • Super Contributor
  • ***
  • Posts: 7681
  • Country: ca
Re: 2SD870 Question
« Reply #3 on: February 09, 2020, 05:53:29 pm »
That's pretty much dead shorted, all the readings way too low. 2SD871 also works.
 
The following users thanked this post: OpenCircuit

Offline OpenCircuitTopic starter

  • Regular Contributor
  • *
  • Posts: 165
  • Country: us
Re: 2SD870 Question
« Reply #4 on: February 09, 2020, 09:50:03 pm »
I sent the seller images on ohms settings showing dead short while removed from circuit and they stated it was functioning normally.  :palm: I am no EE, but I know a place....
 

Offline floobydust

  • Super Contributor
  • ***
  • Posts: 7681
  • Country: ca
Re: 2SD870 Question
« Reply #5 on: February 10, 2020, 01:40:01 am »
I would hacksaw off the top and peek inside. Might be good for a laugh. Where was the seller, so we can avoid them.
 

Offline ArthurDent

  • Super Contributor
  • ***
  • Posts: 1193
  • Country: us
Re: 2SD870 Question
« Reply #6 on: February 10, 2020, 02:25:43 am »
When I click on the images above I get a 'malicious link' warning from Kaspersky Internet Security.
 

Offline OpenCircuitTopic starter

  • Regular Contributor
  • *
  • Posts: 165
  • Country: us
Re: 2SD870 Question
« Reply #7 on: February 10, 2020, 06:06:13 am »
When I click on the images above I get a 'malicious link' warning from Kaspersky Internet Security.

Been posting images there for years.

I would hacksaw off the top and peek inside. Might be good for a laugh. Where was the seller, so we can avoid them.

Chop it up...sounds like fun- if I do I will post what I find. 
Sorry, I'd rather not say. I don't think this person actually looked at the ohm reading images I sent and just  assumed based on historical information. I'm curious as to how many of those are new defects.
« Last Edit: February 10, 2020, 06:15:31 am by OpenCircuit »
 

Offline OpenCircuitTopic starter

  • Regular Contributor
  • *
  • Posts: 165
  • Country: us
Re: 2SD870 Question
« Reply #8 on: February 11, 2020, 09:09:24 pm »
Let down was all I found... not even a laugh inside.

 

Offline wraper

  • Supporter
  • ****
  • Posts: 17952
  • Country: lv
Re: 2SD870 Question
« Reply #9 on: February 11, 2020, 09:26:25 pm »
Blue glass seals are a dead giveaway of fake Chinese crap.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf