Amplifier repair
2000 Watt CAFz'r
Joined: Jun 2001
Posts: 3,260
mr steve, im sorry to have to break this to you, but this thread is defenetly now officialy over your head. Hooking the amp to a scope, will do nothing, because at this point, THERE IS NO AC WAVEFORM! The wave is going to look something like this...
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Pinhead-exactly what I was getting at, the transistors are fed DC from the power supply along with an AC signal from an external unit where they are added together to form an amplified AC signal. [img]graemlins/thumb.gif[/img]
Mister Steve-yes you should indeed read an AC signal on the output on a properly functioning amplifier, but in my case I am getting a DC reading because the transistors are shorted dumping the entire DC source from the powersupply on to the outputs.
Nothing is burnt in the amp. Measuring componets on an amp is difficult because in most cases the signal from your meter will backfeed through other parts of the amplifier circutry resulting in misreadings. In order to obtain proper readings the components must be removed first, then tested. I'd be here for weeks if I did that with all the parts in the above amp. I did however find the shorted fet because it failed closed which was apparent on my DMM.
Getting a schematic is next to impossible unless you know something or someone I dont. I already tried, but was shot down.
Yes amplifiers are meant to drive something, but how can it drive something when the output is clearly shorted? If you know a speaker that will handle 44VDC then send it my way, because I certainly dont. I have a pretty good idea what 44VDC will look like on a scope, probably something like this------------------------------
*Edit* hahaha, great minds think alike Ty...
posted this before I saw your post [img]graemlins/thumb.gif[/img]
[ March 02, 2004, 07:23 PM: Message edited by: Kilowatt ]
Mister Steve-yes you should indeed read an AC signal on the output on a properly functioning amplifier, but in my case I am getting a DC reading because the transistors are shorted dumping the entire DC source from the powersupply on to the outputs.
Nothing is burnt in the amp. Measuring componets on an amp is difficult because in most cases the signal from your meter will backfeed through other parts of the amplifier circutry resulting in misreadings. In order to obtain proper readings the components must be removed first, then tested. I'd be here for weeks if I did that with all the parts in the above amp. I did however find the shorted fet because it failed closed which was apparent on my DMM.
Getting a schematic is next to impossible unless you know something or someone I dont. I already tried, but was shot down.
Yes amplifiers are meant to drive something, but how can it drive something when the output is clearly shorted? If you know a speaker that will handle 44VDC then send it my way, because I certainly dont. I have a pretty good idea what 44VDC will look like on a scope, probably something like this------------------------------
*Edit* hahaha, great minds think alike Ty...
posted this before I saw your post [img]graemlins/thumb.gif[/img][ March 02, 2004, 07:23 PM: Message edited by: Kilowatt ]
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