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Old 14th January 2013, 09:51 PM   #1
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Default AQ 2200 in protection

A friend gave me this amp to look at. Apparently he was "pop testing" (with a 12v batt) his subs for proper polarity and didn't realize the amp was hooked up.

Needless to say after he hooked it back up it goes straight into protect.

I've checked the PS and output transistors. They all appear fine. The center leg of the PS transistors have 12v, pins 1 and 3 have 0.000v. I have no power to the TL074CN's.

Perry, I also checked

Q225 (C3198) pin 1: 0.000v Pin 2: 0.000v pin 3: -0.070v
Q226 (A1266) pin 1: 12.4v Pin 2: 0.000v Pin 3: 12.4v

It pulls no current until I hook up remote then it jumps to around 1.7a then goes into protect and drops back to hardly no current.

I have both power and ground on the KA7500 but nothing else on any of the pins I could get to with my probes.

What should I check next?

Thanks in advance guys.

Last edited by Deadly Sones; 14th January 2013 at 10:09 PM.
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Old 14th January 2013, 11:03 PM   #2
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Quote:
Originally Posted by Deadly Sones View Post
A friend gave me this amp to look at. Apparently he was "pop testing" (with a 12v batt) his subs for proper polarity and didn't realize the amp was hooked up.

Needless to say after he hooked it back up it goes straight into protect.

I've checked the PS and output transistors. They all appear fine. The center leg of the PS transistors have 12v, pins 1 and 3 have 0.000v. I have no power to the TL074CN's.

Perry, I also checked

Q225 (C3198) pin 1: 0.000v Pin 2: 0.000v pin 3: -0.070v
Q226 (A1266) pin 1: 12.4v Pin 2: 0.000v Pin 3: 12.4v

It pulls no current until I hook up remote then it jumps to around 1.7a then goes into protect and drops back to hardly no current.

I have both power and ground on the KA7500 but nothing else on any of the pins I could get to with my probes.

What should I check next?

Thanks in advance guys.
Well if you have no gate voltage on the power supply fets or regulated voltage to the op-amps it would appear the supply is not functioning. The KA7500 sends the signal to the drivers and the drivers to the supply fets.

Have you checked the gate signal on a scope?
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Old 14th January 2013, 11:34 PM   #3
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yes I did. Only have 12v on center leg. everything else seems to be shut off or in protect
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Old 14th January 2013, 11:38 PM   #4
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Did you view the drive signal on a o-scope?

If you do not have a gate signal the power supply fets are not being driven.

I am assuming you have an o-scope?
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Old 14th January 2013, 11:43 PM   #5
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Yes I do, it reads nothing. There is no drive signal.
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Old 14th January 2013, 11:56 PM   #6
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So I must have done something to the remote... cause now I have the following readings:

KA7500bd

pin1: 6.26
pin 2: 2.521
pin 3: 4.26v
pin 4: 3.567
pin 5: 1.536
pin 6: 3.644
pin 7: 0
pin 8: 13.14
pin 9: 0
pin 10: 0
pin 11: 13.14
pin 12:13.14
pin 13: 4.96
pin 14: 4.96
pin 15: 4.96
pin 16: 0v

Still no ps gate drive signal though...

Last edited by Deadly Sones; 15th January 2013 at 12:04 AM.
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Old 15th January 2013, 12:14 AM   #7
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the only thing I see out of place is this...
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Old 15th January 2013, 12:38 AM   #8
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Also on Q225 I now have 0.000v on pin 1, 13.4 on pin 2, and 0.000v on pin 3

Last edited by Deadly Sones; 15th January 2013 at 12:40 AM.
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Old 15th January 2013, 12:45 AM   #9
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Both pin 1 and pin 4 are too high. What's driving those pins?
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Old 15th January 2013, 12:47 AM   #10
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I have no idea... I'll have to look into it in the morning. Thanks Perry.
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