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HELP HELP HELP - Just blew my amp, can't afford a new one.
HELP HELP HELP - Just blew my amp, can't afford a new one.
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Old 9th February 2018, 04:58 PM   #11
rayma is offline rayma  United States
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Quote:
Originally Posted by nannoo View Post
I am wondering if my best option is to physically disconnect the power channel that is blown?
Or will that cause the amp to fail again?
That's the easiest option. Do you use more than 2 channels?
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Old 9th February 2018, 05:04 PM   #12
nannoo is offline nannoo
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I use 6, (main monitors tri amp'd)

But the amp has 7.... so I can get away with losing one. Not ideal but if it's a quick fix it seems like the best solution

There's no voltage on any of the test sites but I wouldn't really expect there to be given that they're set to 0 at factory anyway and there's no way of getting voltage to the amps at the moment.
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Old 9th February 2018, 05:06 PM   #13
Project16 is offline Project16  France
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Quote:
Originally Posted by nannoo View Post
I am wondering if my best option is to physically disconnect the power channel that is blown? Or will that cause the amp to fail again?
Follow the instructions of SVI2004A, you will know if the power is defective or not (HS power transistors ).

Edit: We posted at the same time and I did not know your answer.

Last edited by Project16; 9th February 2018 at 05:10 PM.
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Old 9th February 2018, 05:13 PM   #14
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
No voltage at test points?

Power amp may be ok

The screw terminals off each side of capacitors in centre.. are voltages ok there?
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Old 9th February 2018, 05:14 PM   #15
nannoo is offline nannoo
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I need to hold my hands up and say I don't understand.... how can I know if the power transistors are defective if the amp won't deliver power to the circuit?
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Old 9th February 2018, 05:15 PM   #16
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
It makes me wonder... as he has a point...

I would not expect output relays to engage if there was DC present... and he says they engage, then revert to protect
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Old 9th February 2018, 05:20 PM   #17
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
If there was a short or massive dc imbalance, you would see up to 60V at either side to Test point to ground...

Hold - meter Lear to metal base of amp... check on each side of TP - should be 0v

This often triggers protect not to kick in

—-

If there is no dc voltage present, there could be another issue
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Old 9th February 2018, 05:27 PM   #18
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
How is TP301 on centre pcb with caps? Should have 120V measured across pin 1 and 3
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Old 9th February 2018, 05:35 PM   #19
nannoo is offline nannoo
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I can get a momentary reading from TP301 which drops down pretty rapidly after the relay kicks back out. (i.e. 113V then falls quick)
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Old 9th February 2018, 05:44 PM   #20
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
It may be the cpu is switching main xfmr... check TP101 on power up (to ground) then see what another amp TP does, it’s possible that cpu is waxing power to amp - you might see similar spikes to 56V on TP101 in same duration as TP303 is with 113V
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