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problem in transistor test
problem in transistor test
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Old 21st May 2010, 08:32 PM   #1
seifi is offline seifi
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Join Date: May 2010
Default problem in transistor test

hello to all ( first post )
i wanted to check a 2SC3052F and 2SA1235F in this schematic ( An AIWA HiFi )
Click the image to open in full size.

when they tested (even out of board) everything is ok except that about 1000 ( multi tester in diode test mode ) between collector and emitter (in just one way) .
are they really broken ?
if yes would you please help this newbie with poor english with some equivalents?!
thanks in advance
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Old 21st May 2010, 11:27 PM   #2
bob91343 is offline bob91343  United States
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They are probably okay. Generally, transistors either work or they don't. Diode test the C-B and E-B junctions and verify no short C-E. That would be a good transistor. You can often do it in circuit.
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Old 22nd May 2010, 12:27 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by bob91343 View Post
They are probably okay. Generally, transistors either work or they don't. Diode test the C-B and E-B junctions and verify no short C-E. That would be a good transistor. You can often do it in circuit.
The only odd transistor I ever found was faulty had an HFE of 1 !
Thats the only one I have found in 30 years of experience.
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Old 23rd May 2010, 09:21 AM   #4
seifi is offline seifi
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Quote:
Originally Posted by bob91343 View Post
They are probably okay. Generally, transistors either work or they don't. Diode test the C-B and E-B junctions and verify no short C-E. That would be a good transistor. You can often do it in circuit.
Thanks
I always test B-E and B-C first . the only conduction in all 8 available modes of check . but here a partial conduction between E-C in just one direction made me confused ( in all 5 transistors )
I found another pair of these models in the same circuit and had no problem in testing them . so maybe they are broken ...
would you plz give me equivalents ?
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