Kicker ZX1500.1 protects when driven hard - Page 3

peeby · Yesterday, 06:52 PM

No, using the secondary ground.

Using the scope, the rail seems to "Freak out" right at the point of amp shutdown, hard to tell if it is prior or post to shut down.

PapaZBill · Yesterday, 07:28 PM

Have you tried to vary voltage w/o signal as Russell suggested in post #15?

I believe I have seen an issue with the UVP back in the day. Take voltage measurements around U2-TL494. Use power ground for black probe. Also check around Q28-KTC4401 and D30-1N5237B-8.2v zener diode.

The noise may be the cause of a burnt ground trace and be be why the amp is shutting down. You will have to examine the bottom side of PCB to determine. This was not an uncommon problem and is easily fixed.

peeby · Yesterday, 09:58 PM

Varying voltage the amp shuts off when decreasing supply voltage at 9.5 volts.

Cant find any burned traces.

Voltage across zener D30 is 8.1V. Q28 checks ok in circuit.

PapaZBill · Yesterday, 11:15 PM

Post the DC volts around U2

Did you examine the bottom side of PCB?

peeby · Yesterday, 11:40 PM

The voltage around U2 are normal. Pin 3 is staying at 0v and the chip is producing PWM on 9 and 10.

So I just figured out even with no load on the speaker outputs the amp will while increasing sine wave input, start to draw excessive current and shut down at the same point everytime. Pin 3 on U2 stays at 0V, then there is a transient spike on Pin 3 and it shuts down.

Yesterday, 07:28 PM	#22
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	Have you tried to vary voltage w/o signal as Russell suggested in post #15? I believe I have seen an issue with the UVP back in the day. Take voltage measurements around U2-TL494. Use power ground for black probe. Also check around Q28-KTC4401 and D30-1N5237B-8.2v zener diode. The noise may be the cause of a burnt ground trace and be be why the amp is shutting down. You will have to examine the bottom side of PCB to determine. This was not an uncommon problem and is easily fixed. __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

Yesterday, 11:15 PM	#24
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	Post the DC volts around U2 Did you examine the bottom side of PCB? __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Kicker KX600.4 protects and led alternately flashing	nonprof	Car Audio	14	1st June 2016 05:20 AM
Kicker ZX1500.1 without gate drive.	Randy62	Car Audio	7	29th May 2013 06:47 PM
kicker zx1500 mosfet question	ksweet420	Car Audio	9	11th March 2013 10:12 PM
kicker zx1500.1 output inductor?	shane300zx	Car Audio	9	2nd August 2011 09:58 AM
Kicker zx1500.1 not working	Andrew123654	Car Audio	12	19th October 2010 01:04 PM

New To Site?	Need Help?
Register to Participate Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

Yesterday, 06:52 PM	#21
peeby diyAudio Member Join Date: May 2020	No, using the secondary ground. Using the scope, the rail seems to "Freak out" right at the point of amp shutdown, hard to tell if it is prior or post to shut down.

Yesterday, 09:58 PM	#23
peeby diyAudio Member Join Date: May 2020	Varying voltage the amp shuts off when decreasing supply voltage at 9.5 volts. Cant find any burned traces. Voltage across zener D30 is 8.1V. Q28 checks ok in circuit.

Yesterday, 11:40 PM	#25
peeby diyAudio Member Join Date: May 2020	The voltage around U2 are normal. Pin 3 is staying at 0v and the chip is producing PWM on 9 and 10. So I just figured out even with no load on the speaker outputs the amp will while increasing sine wave input, start to draw excessive current and shut down at the same point everytime. Pin 3 on U2 stays at 0V, then there is a transient spike on Pin 3 and it shuts down.