Kicker ZX1500.1 protects when driven hard - Page 4

mbates14 · 20th January 2021, 08:24 PM

those ZR "grille" amps love to eat outputs. I've noticed that.

peeby · 23rd January 2021, 12:26 AM

OK - low voltage is fine and have voltage on the class d card but now no output from the card. I killed it somehow.

-drv is 3.6v and +drv is 5.2v dc measured on scope. Dc no oscillation.

Any suggestions on which IC's to replace? All diodes, caps and resistors are checking ok.

PapaZBill · 23rd January 2021, 06:04 PM

Look at the U202-LM361 with an Oscope Pins 3,4,9 & 11 and measure DC volts around U200,201,202 & 203. Post voltages and screenshots.

It's possible the problem is the Drive circuit underneath the card. Q100,102,OPT100,101 & U100,101.

To check this circuit you may want to modify the Class D card, so that you can stand card upright to get to the drive circuit underneath. I have done this by bending the pins by 90 degrees on one side and extending the pins on the other with ribbon cable.

peeby · 24th January 2021, 03:57 AM

PapaZBill- what is the value of D7? Placing a parts order. Thanks

RussellKinder · 24th January 2021, 05:08 AM

Quote:

Originally Posted by PapaZBill

I have done this by bending the pins by 90 degrees on one side and extending the pins on the other with ribbon cable.

Don't you love designs made for repairability?
--

PapaZBill · 24th January 2021, 03:09 PM

Quote:

Originally Posted by peeby

PapaZBill- what is the value of D7? Placing a parts order. Thanks

D7-1N4148

PapaZBill · 25th January 2021, 04:10 PM

Quote:

Originally Posted by RussellKinder

Don't you love designs made for repairability?
--

Russell, you may know this, but Kamen Vasilev designed this amp. For the most part it's not a bad amp to work on but the drive circuit underneath the daughter board does add a challenge.

Perry Babin · 25th January 2021, 09:05 PM

Re#33:
You can make male/female ribbon cable jumpers for headers with full length pins. This doesn't work for driver boards that are soldered into the boards due to the short pin length. The ones for JL amps are great time savers.

peeby · 27th January 2021, 10:17 PM

PapaZBill - I actually have 2 of these amps. My other one the +/-12V regulator is putiing out 15V. Why would that be? Measuring +/-15 at the zeners. And will that cause problems with the IC's?

PapaZBill · 28th January 2021, 12:15 PM

In later versions the +/- voltage was beefed up.

28th January 2021, 12:15 PM	#40
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	In later versions the +/- voltage was beefed up. __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

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20th January 2021, 08:24 PM	#31
mbates14 diyAudio Member Join Date: Jun 2002 Location: non	those ZR "grille" amps love to eat outputs. I've noticed that.

23rd January 2021, 12:26 AM	#32
peeby diyAudio Member Join Date: May 2020	OK - low voltage is fine and have voltage on the class d card but now no output from the card. I killed it somehow. -drv is 3.6v and +drv is 5.2v dc measured on scope. Dc no oscillation. Any suggestions on which IC's to replace? All diodes, caps and resistors are checking ok.

23rd January 2021, 06:04 PM	#33
PapaZBill diyAudio Member Join Date: Oct 2013 Location: Yale, Oklahoma	Look at the U202-LM361 with an Oscope Pins 3,4,9 & 11 and measure DC volts around U200,201,202 & 203. Post voltages and screenshots. It's possible the problem is the Drive circuit underneath the card. Q100,102,OPT100,101 & U100,101. To check this circuit you may want to modify the Class D card, so that you can stand card upright to get to the drive circuit underneath. I have done this by bending the pins by 90 degrees on one side and extending the pins on the other with ribbon cable. __________________ Any sufficiently advanced technology is indistinguishable from magic. Arthur C. Clarke

24th January 2021, 03:57 AM	#34
peeby diyAudio Member Join Date: May 2020	PapaZBill- what is the value of D7? Placing a parts order. Thanks

27th January 2021, 10:17 PM	#39
peeby diyAudio Member Join Date: May 2020	PapaZBill - I actually have 2 of these amps. My other one the +/-12V regulator is putiing out 15V. Why would that be? Measuring +/-15 at the zeners. And will that cause problems with the IC's?