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Old 09-11-2018, 10:16 AM   #61
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Default Re: Electron Kinetics Eagle 2C amplifier problem

The thread is long so I do not remember if you already test that Transistor already or not and compare it to the working channel. You have one working channel so you can always do the comparison test against working channel.
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Old 09-11-2018, 12:52 PM   #62
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Default Re: Electron Kinetics Eagle 2C amplifier problem

Sorry for the lengthy thread! Here are the voltages from the transistors I measured from each side:

(CHANNEL A) Top Transistors
#1 Sanken (2SC2774) B=.631 DCV/ C=48.0 DCV/ E=.018 DCV
#2 Sanken (C2168) B=1.22 DCV/ C=47.7 DCV/ E=.627 DCV
#3 Sanken (2SC2774) B=.626 DCV/ C=48.0 DCV/ E=.017 DCV
#4 Sanken (A958) B=46.4 DCV/ C=1.22 DCV/ E=47.3 DCV

(CHANNEL A) Bottom Transistors
#1(2SA1170) B= .603 DCV/ C= -46.55 DCV/ E= -.012 DCV
#2(A958) B= -1.22 DCV/ C= -46.33 DCV/ E= -.600 DCV
#3(2SA1170) B= -.593 DCV/ C= -47.3 DCV/ E= -.002 DCV
#4(2SC2168) B= -44.7 DCV/ C= -1.20 DCV/ E= -44.8 DCV


(CHANNEL B) Top Transistors
#1 Sanken (A958) B= 47.8 DCV/ C= -40.0 DCV/ E=46.1 DCV
#2 Sanken (2SC2774) B= -21.0 DCV/ C= 46.8 DCV/ E= -19.6 DCV
#3 Sanken (C2168) B= -18.8 DCV/ C=46.8 DCV/ E= -18.9 DCV
#4 Sanken (2SC2774)B= -18.75 DCV/ C=46.9 DCV/ E= -19.4 DCV

(CHANNEL B) Bottom Transistors
#5 (2SC2168) B= -44.8 DCV/ C= -2.27 DCV/ E= -44.8 DCV
#6 (2SA1170) B= -1.15 DCV/ C= -45.9 DCV/ E= -.63 DCV
#7 (A958) B= -1.9 DCV/ C= -46.7 DCV/ E= -1.22 DCV
#8 (2SA1170) B= -1.42 DCV/ C= -46.1 DCV/ E= -.75 DCV
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Old 09-11-2018, 01:06 PM   #63
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Default Re: Electron Kinetics Eagle 2C amplifier problem

If you suspect that E-B junction is shorted then you should be able to use Ohm meter to check the resistance between E and B pin if the suspect transistor.
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Old 09-11-2018, 06:23 PM   #64
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Default Re: Electron Kinetics Eagle 2C amplifier problem

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If you suspect that E-B junction is shorted then you should be able to use Ohm meter to check the resistance between E and B pin if the suspect transistor.
OK, I will do that and post the resistance. Should I discharge the caps before I take a measurement of the transistor's resistance?

Thanks!
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Old 09-11-2018, 09:06 PM   #65
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Default Re: Electron Kinetics Eagle 2C amplifier problem

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OK, I will do that and post the resistance. Should I discharge the caps before I take a measurement of the transistor's resistance?

Thanks!
Yes! discharge the caps and then take the Voltage reading on the discharged caps to make sure it is discharged.
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Old 09-12-2018, 02:58 AM   #66
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Default Re: Electron Kinetics Eagle 2C amplifier problem

I measured that transistor (2SC2168) from B to E and got 1.292 M ohms..Does this seem bad?

Last edited by Gammaray; 09-12-2018 at 03:01 AM..
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Old 09-12-2018, 08:52 AM   #67
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Default Re: Electron Kinetics Eagle 2C amplifier problem

Not really, but
Read post #61 again. and check other parts the same way, you may be suprised at what you will find that way.
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Old 09-12-2018, 11:58 AM   #68
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Default Re: Electron Kinetics Eagle 2C amplifier problem

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Not really, but
Read post #61 again. and check other parts the same way, you may be suprised at what you will find that way.
Also in post #4.
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Old 09-12-2018, 08:17 PM   #69
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Default Re: Electron Kinetics Eagle 2C amplifier problem

Would it be ok to take the pcb off from the amp chassis and do some resistance comparisons? I mean is this a good way to find faulty components without worrying about if I may accidently touch some live/hot and zap me or something else?
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Old 09-14-2018, 09:36 AM   #70
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Default Re: Electron Kinetics Eagle 2C amplifier problem

bump
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Old 09-14-2018, 10:07 AM   #71
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Default Re: Electron Kinetics Eagle 2C amplifier problem

You are taking the resistance reading so the unit should not be powered in the first place so I do not see how you will be zapping anything once the filter caps are discharged and the unit is not plugged in.
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Old 09-14-2018, 12:15 PM   #72
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Default Re: Electron Kinetics Eagle 2C amplifier problem

If you pull the board out, a schematic can get drawn up given some good pictures of the back side. The front pics have some areas I can't see.
Sometimes it's easier to sketch it one and then troubleshoot.
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Old 09-16-2018, 06:09 AM   #73
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Default Re: Electron Kinetics Eagle 2C amplifier problem

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Originally Posted by budm View Post
You are taking the resistance reading so the unit should not be powered in the first place so I do not see how you will be zapping anything once the filter caps are discharged and the unit is not plugged in.
OK, I see. So would I have to de-solder these components to check for resistance, or can I leave them mounted to the pcb and check resistance?
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Old 09-16-2018, 06:10 AM   #74
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Default Re: Electron Kinetics Eagle 2C amplifier problem

Quote:
Originally Posted by redwire View Post
If you pull the board out, a schematic can get drawn up given some good pictures of the back side. The front pics have some areas I can't see.
Sometimes it's easier to sketch it one and then troubleshoot.
Thanks, but not sure how I could draw up these traces for the schematics. Seems to be a little out of my noob hands..LOL
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