How do you test, a RET transistor?

[tibimakai]

Sorry about posting here, but section seems more active than others.
I have two transistors, that I have to check: RT1N241C and KRA103S.
They are complementary NPN and PNP transistors with resistors in them.
How should I measure these? What should I see on the meter when I'm measuring?
Thank you.

Tibor

[kasfamily]

Re: How do you test, a RET transistor?

In PDF the values built-in resistor, so they must be taken into account when measuring

[tibimakai]

Re: How do you test, a RET transistor?

My problem is, that in diode mode it only shows OL both ways.

[tom66]

Re: How do you test, a RET transistor?

Normal for an NPN. Test across B-E and B-C and you should find two diodes.
Usually NPN fails C-E short, or B-E open.

[tibimakai]

Re: How do you test, a RET transistor?

A regular diode, I know how to check, but this one has resistors in them and the meter does not show anything, just OL, both ways and the test leads switched it is the same way, just OL.

[budm]

Re: How do you test, a RET transistor?

OL both way in Diode mode is not right. You can grab a transistor and resistor and make a circuit as shown in the spec sheet to see what you get with the readings.

[tibimakai]

Re: How do you test, a RET transistor?

I figured, that it doesn't sound right, that is why I'm asking.
I would not like to replace these transistors and at the end to find out, that they were good ones.
Good idea Bud. I will do that.
Thanks.
By the way, this is for the Pioneer VSX-1122k home theater receiver. I have found these two transistors, on the IR board.

[tom66]

Re: How do you test, a RET transistor?

They would be an unlikely candidate for failure. Many other things would probably fail before them.

[tibimakai]

Re: How do you test, a RET transistor?

Tom you were right. I have put together a transistor and two resistors and it did not show anything. Only on the resistance scale, but not on the Diode tester.
Thank you.
Any help, would be appreciated with this receiver, in the audio section.

[budm]

Re: How do you test, a RET transistor?

@22K ohms for the Base resistor, the meter cannot putout enough voltage to turn on the EB junction.

[tibimakai]

Re: How do you test, a RET transistor?

Most likely it need more voltage at the base and then I should measure with the voltmeter the EK side. But at this point, I assume that they are good transistors.