Jbl gtq 400

mike49504 · 31st May 2010, 05:22 PM

Im working on this amp and cant figure out why its stuck in protection .

The guy told me that 2 channels worked and 2 didnt . But on the bench its in protection all the time.

Ive tested the outputs in it all seem to be fine.

Wondering where i go from here?

Perry Babin · 31st May 2010, 06:00 PM

Post the voltage on the 594.

mike49504 · 31st May 2010, 06:23 PM

I only got to pin12 on the 594 before the fets went up in smoke.

1:0
2:2.50
3:.07
4:0
5:1.76
6:3.42
7:0
8:6.20
9:2.41
10:2.50
11:6.20
12:0

They are using SMP65N06's in this amp can i swap them to something different?

Perry Babin · 31st May 2010, 07:14 PM

I don't know what you have on hand.

If the FETs failed, at least one of the drivers has likely failed also.

mike49504 · 31st May 2010, 07:23 PM

I have the following fets on hand

IRFZ44

IRF3205

FQP65N06

Thats all i have in right now Been doing alot of repairs and im running out of parts again

Perry Babin · 31st May 2010, 07:29 PM

I've used the 3205s without problems.

mike49504 · 31st May 2010, 07:33 PM

Ok i will use the 3205's I still have 2 good fets of the old one im gonna stick 1 in each side and try to trouble shoot the amp somemore. I will post the voltages on the 594 in a few mins

31st May 2010, 05:22 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Jbl gtq 400 Im working on this amp and cant figure out why its stuck in protection . The guy told me that 2 channels worked and 2 didnt . But on the bench its in protection all the time. Ive tested the outputs in it all seem to be fine. Wondering where i go from here?

31st May 2010, 06:00 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post the voltage on the 594. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

31st May 2010, 07:14 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't know what you have on hand. If the FETs failed, at least one of the drivers has likely failed also. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

31st May 2010, 07:29 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I've used the 3205s without problems. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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31st May 2010, 06:23 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	I only got to pin12 on the 594 before the fets went up in smoke. 1:0 2:2.50 3:.07 4:0 5:1.76 6:3.42 7:0 8:6.20 9:2.41 10:2.50 11:6.20 12:0 They are using SMP65N06's in this amp can i swap them to something different?

31st May 2010, 07:23 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	I have the following fets on hand IRFZ44 IRF3205 FQP65N06 Thats all i have in right now Been doing alot of repairs and im running out of parts again

31st May 2010, 07:33 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Ok i will use the 3205's I still have 2 good fets of the old one im gonna stick 1 in each side and try to trouble shoot the amp somemore. I will post the voltages on the 594 in a few mins

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