Kicker ZX300.1

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Jason Smith 616

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Joined 2016
#1
Amp powers up and produces + - 49 volts on the outputs So im getting rail voltages..

I have + - 15 volts on all opamps..

What is happening is when the amp is powered up the power led fades out and i get no audio out of this amp..

When the power led fades i still get rail and regulated voltges but no audio output..

Anyone have any suggestions on where to start looking ?
 
#4
Here are the pics of the board as requested..
 

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#8
IMG_2098.jpgAgain with no load or signal, check the DC voltages on the preamp boards header socket. You should be able to insert red probe into each socket with black probe to power ground. Post results 1 through 12 as indicted in the photo I posted.

Also, check DC voltage between power and speaker ground.
 
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#11
Pin 4 should be -15vdc and Pin 5 should be +15vdc and Pin 10 should be -20 vdc (muting). You indicated in Post #1 that you had the +/-15vdc on opamps. Please recheck and verify. You may try using speaker ground as your reference.

Also, measure between Speaker and Power grounds with an ohmmeter
 
#14
PapaZBill said:
Please explain what is difference between Post #10 and Post #12 results. Did you use power ground for the black probe on #10 and speaker ground for the #12?

Also, please measure with an ohmmeter between speaker and power ground
Click to expand...

I was a bit rushed when I posted earlier. I just need to verify what reference(black probe on speaker or power ground?) you used when measuring DC voltages for both Post #10 and #12, and did you measure between speaker and power ground?

This will help explain why there is a discrepancies between both sets of results.
 
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#15
I used the speaker ground in both posts..

In post 10 i think what happened is i didnt have the meter probe pushed down enought in the connector for the readings ..

In post 12 i pushed the meter probe down a lil further so it would make contacct.. i just measured again and all the readings from post 12 is what i still have now..

From power ground to speaker ground i get 0.04 ohms
 
#16
Okay,that makes things a little more clear! Sometimes the zero ohm resistor/ jumper tying speaker & power ground together will open and cause unexpected voltages readings.

The -13.3 volts on pins 9 & 12 is most likely the issue and the source is IC1-NJM2068.Check DC voltages around the IC and post.

Also,with no power applied measure the resistance between pins 1 & 2 of U1 and while holding the probes rotate the gain control through its entire range, verify that the resistances vary between zero and ~20Kohms.

Sent from my HTC Desire 626 using Tapatalk
 
#20
Replaced IC 1 an checked he resistors cap all around that IC..

Same results Amp has no output.

Readings on the pins are :

Pin 1:0.00
Pin 2:13.87
Pin 3:0.00
Pin 4:-15.70
Pin 5:-14.07
Pin 6:0.00
Pin 7:0.02
Pin 8:0.00
Pin 9:-13.42
Pin 10:-20.18
Pin 11:0.00
Pin 13:-13.60

Readings on IC1

Pin 1:-13.44
Pin 2:-9.86
Pin 3:-0.00
Pin 4:-15.72
Pin 5:-7.82
Pin 6:-5.87
Pin 7:-13.90
Pin 8:-14.02

And yes the negative sign is what my meter shows on every pin of the IC --- Black probe on speakers ground terminal
 
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