Kicker ZX750.1 Green Light No Output

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#21
Okay the amp is on tested the resistance one the Mosfets

Side with the power irfs
9640: -53.6
640: -51.5

The rail test I think you called it black n neg dc test
9640 640
Leg1: 53.4 Leg1:-54.1
Leg2: 0 Leg2: 0
Leg3: 58.1 Leg3:-58.1

Other Side----------
9640: -53.5
640: -51.4

Test 2
9640. 640
Leg1: 53.4 Leg1: -54.1
Leg2: 0 Leg2: 0
Leg3: 58.2 Leg3: -58.1

Sorry this was sent off my phone
 
#22
okay, your amp is powering up and the class D circuit is working. So, the amp is not passing signal/audio. which could be the preamp/xover board. the boardvthat plugs in and has the RCA inputs. if you don't have the board plugged in, go ahead and plug in (with power off of course). check the DC voltage the black probe on the neg speaker terminal and check the row off pins that plug into the board. these pins carry the +/- 12 volts for the op amos
 
#24
Lets see if the relay is working. With your ohm meter put one probe on the positive speaker terminal(if you have a way of clipping the probe to the terminal,so that you have one hand free,do it) and the other probe on the side closest to the speaker terms of the small coil with the black core, standing up between the doughnut shaped output coils(Toroid). Before you apply power you should read a high or infinite resistances.After you power up the amp the resistance should drop to near zero. If this is not the case the the relay is bad or bad solder or open via.Let me know what you find.

Do you have a way to plug in an audio source? If so you can use your AC voltage mode on the DVM and trace the signal.
 
#25
What relay are you talking about
And how would I get to the pins to a relay
and yes I have everything I need to see if it produces sound right here.
Pa speakers and a headset jack to left and right channel
I had another amp of my hooked up to make sure it all worked
 
#27
I will send you a pic when I have a chance.the relay is the black box with NT90NAS12SB. the leg of the coil next to it is the same point electrically of the input of relay.The pos spkr term is the same point as the output of relay.These points are convenient test points, to place your meter probes. the 4.1 off and .5 on are they voltages or resistances?
 
#32
I think the meter is telling you 4.1kohms (k is short for kilo or 1000) or another way to put it is 4100 ohms and the .5 is 1/2 an ohm,which should be about right. Have you heard the relay click on, it may be a soft click. I was not able to hear the turn off click in the your youtube video, but if you hear it, I'll take your word for it, and pretty sure the relay is ok.

Go ahead and set up your audio, and with the multimeter set to AC volts and a probe tied to the neg spkr term and the other probe on the out pin of the preamp board with 5 pins.you should see a varying reading anywhere from less than a volt to 2 or 3 volts on the peaks of the audio/music. If so leaving the probe on the neg spkr term where it is the other placed on the same test point you used to check relay, the coil standing up. you should see a much larger variation the the out pin. I will have more time later tonight let me know what you find , where getting closer but may take some more time and back and forth.
 
#33
Okay it seemed a little weird this time.
Black Probe in Neg Speaker Term, Amp connected to my phone, no speakers connected at the moment
Multi set to AC Volt 2 V~ symbol


While amp is off-------Music Playing
while amp is off and red probe not connected: it sits around 0.015-0.03

Red Probe to Out on Xboard to Main: starts 0.005 and works down to 0.000 and stays

Red Probe to Coil on Board by Relay: 0


While amp is Powered on-------Music Playing
Black Probe in Negative Red Probe not connected: Jumps up to 0.15-0.3 (I noticed jumping is from red probe moving around)

Red Probe To Out on XBoard to Main: jumps around anywhere from 0.05X-0.000

Coil Standing Up on The Board: anywhere from 0.05-1.1

These weren't very solid numbers like other checks. they moved around a lot. IDK if it from Multi or like you said we are getting close.
Again thank you for all your Help even during the Christmas Time. I work Tonight here in about 3 hours and will be there for 8.
 
#34
Oh and about the Relay.
I never hear it click on and only Hear on click off... But like I said the one I hear click off isn't the Big Black one that we been testing. This clicks sounds more like from the Power Side Of the Board By the Big Doughnut Coil.
 
#35
there is one relay in the amp.It may be difficult to localize the sound but I'm sure it is the relay. I'm not 100% sure the relay Is passing audio, but we'll get back to it later.redo the AC voltmeter test, and turn the gain control up and down. Your meter is looking at a changing AC voltage and that is why you will not see a consistant unchanging reading. turning the gain control will give you a better idea that the amp is passing audio. As you turn it up the average voltage will be higher and turning it down will have the opposite effect. use the same test points. we are bisected the amp, to isolate where the audio stops. when we have a better idea then I will give you a different set of test point to further narrow down the fault.
 
#38
Okay Test Repeat This time I used a 40hz test tone on repeat
Multi is set to V~ 200

This will have two numbers first is gain all the way down second is max

Out Pin on top of xboard: 0.0 to 5.0 (test two 0.0- 5.8)
If Multi set to lower setting like V~2 it shows around .3 up to 2 then loop which on mine is 1
Standing Up Coil: 2.0 up to 54.1 (test two 5.2-58.2)

Second Test numbers where a little Higher than First Test But about the same actions
 
#39
I meant to suggest a test tone, I forget there is an app for that! Good thinking! 40 hz is the perfect test tone for this test and its what I use. the result show the amp is working and passing signal up to the relay, so either the relay is bad or a bad solder joint or an open via. there is a small diode D92 on the left hand side of relay. power up amp and check the DC voltage with one probe on neg power terminal and the other probe check voltage on either side of diode.
 
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