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Old 20th January 2014, 06:41 AM   #2761
waylene is offline waylene  South Africa
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I only get power on my positive rail, this is only the positive rail that warm up when I pump up some volume. The negative rail stay cold and don't warm up like the positive rail. Is there any ting you can think of what can be the problem on it?
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Old 20th January 2014, 07:04 AM   #2762
waylene is offline waylene  South Africa
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I only get power on my positive rail, this is only the positive rail that warm up when I pump up some volume. The negative rail stay cold and don't warm up like the positive rail. Is there any ting you can think of what can be the problem on it?
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Old 20th January 2014, 08:56 AM   #2763
AndrewT is offline AndrewT  Scotland
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disconnect the Amp from the PSU.

Check the PSU thoroughly.
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Old 20th January 2014, 09:52 AM   #2764
waylene is offline waylene  South Africa
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Hi AndrewT I all ready to that two times, there is power on the amp. When I take of fuse on Negative rail, amp is still playing on with out the fuse.
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Old 20th January 2014, 10:05 AM   #2765
waylene is offline waylene  South Africa
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You see here, I use one trapo here that give out +70 +45 0V -70 -45 volt dc out. I use this trapo for only testing the amp.
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Old 20th January 2014, 10:12 AM   #2766
AndrewT is offline AndrewT  Scotland
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you have checked the PSU.
You have connected the amplifier.
the amplifier does not work.
Then either the connections are wrong, or the amplifier is wrong.
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Old 20th January 2014, 10:17 AM   #2767
waylene is offline waylene  South Africa
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You see here sir? Where I mark with green, this positive rail warm up when I pump up some volume, but the negative rail where I mark with red, never switch on, transistor stay cold and never warm up.
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Old 20th January 2014, 10:40 AM   #2768
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Quote:
Originally Posted by waylene View Post
I only get power on my positive rail, this is only the positive rail that warm up when I pump up some volume. The negative rail stay cold and don't warm up like the positive rail. Is there any ting you can think of what can be the problem on it?
Please check or How much voltage that u get on the fuses? It must the same voltage,then when u put high volume the voltage must increase..
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Old 20th January 2014, 06:29 PM   #2769
gantex is offline gantex  Indonesia
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Originally Posted by waylene View Post
You see here sir? Where I mark with green, this positive rail warm up when I pump up some volume, but the negative rail where I mark with red, never switch on, transistor stay cold and never warm up.
im not see any wrong here, or i cannot see? First clean the bottom cooper then Try to replace IR2117 on + rail with IR2117 on - rail, just to check if this both IC is OK. I hope this work.

Regard.
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Old 21st January 2014, 07:10 AM   #2770
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Hi, Waylene,
this is good suggestion
Quote:
Originally Posted by gantex View Post
im not see any wrong here, or i cannot see? First clean the bottom cooper then Try to replace IR2117 on + rail with IR2117 on - rail, just to check if this both IC is OK. I hope this work.

Regard.
Clean the bottom, then try to put other IR2117 from working amp... Maybe the IR2117 not doing the job, I have someone here warning about IR2117.
He have bad IR2117 that can oscillate by itself...
If changing them don't solve the problem, maybe you have broken trace or broken transistor, check 2N5401-2N5551 MJE340-350
or you can try to measure the voltage on each base to ground... If you find different more than 10%(positive & negative side) then you will start to find where is your problem
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