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Kicker CXA300. 4 pulsating protection issue.
Kicker CXA300. 4 pulsating protection issue.
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Old 14th February 2020, 02:55 AM   #11
PapaZBill is offline PapaZBill  United States
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Quote:
Originally Posted by rhempz01 View Post
Tl494c voltage.
1.) . 883
2.) 3.693
3.) 0.054
4.) 0.029
5.) 1.445
6.) 0.001
7.) 0.000
8.) 0.000
9.) 10.21
10.) 5.23
11.) 0.008
12.) 13.19
13.) 4.891
14.) 4.872
15.) 4.871
16.) 4.117

As soon as I add the fets the pulsing starts, using irf3205's still have the 100R gate resistors, should I lower the resistance to say 47R?
The voltages you listed for Pins 8 through 11 can't be correct, considering the waveforms you posted. But based on those waveforms the power supply is working. I'll have to get back to you about the gate resistor values, but the 100 ohm resistors shouldn't cause the amp to pulsate.

Check the resistances between speaker and power GND's
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Old 14th February 2020, 03:14 AM   #12
rhempz01 is offline rhempz01  United States
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OK and I believe I have used the 100R resistors before. of Q7, Q13? 2N4403?
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Old 14th February 2020, 08:17 PM   #13
rhempz01 is offline rhempz01  United States
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Which rectifiers go where. This is what I have.
BR1: MUR1620CT
BR2: MUR1620CTR
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Old 14th February 2020, 10:03 PM   #14
rhempz01 is offline rhempz01  United States
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OK, now I have been through the entire curcuit. No failed components. Drive is good. I removed all the outputs and lifted the output protection resistors. R33, R34, R88, R89. Powered up the amp, current. So I go to Check the ps fets one is shorted. I remove it and power it up again. Current. Removed them all drive is 100% Good 30khrz square wave. All resistors and capacitors check good. So I'm leaning towards the transformer has a short somewhere.
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Old 15th February 2020, 02:07 AM   #15
PapaZBill is offline PapaZBill  United States
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Quote:
Originally Posted by rhempz01 View Post
OK and I believe I have used the 100R resistors before. of Q7, Q13? 2N4403?
Q7 and Q13 are 2N4403.
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Old 15th February 2020, 02:13 AM   #16
PapaZBill is offline PapaZBill  United States
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Quote:
Originally Posted by rhempz01 View Post
Which rectifiers go where. This is what I have.
BR1: MUR1620CT
BR2: MUR1620CTR
To be sure the diode pack for BR1 is common cathode. That leaves BR2 to be common anode.

The schematic shows a U1620C-BR1 and U1620A-BR2.
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Old 15th February 2020, 02:18 AM   #17
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Quote:
Originally Posted by rhempz01 View Post
OK, now I have been through the entire curcuit. No failed components. Drive is good. I removed all the outputs and lifted the output protection resistors. R33, R34, R88, R89. Powered up the amp, current. So I go to Check the ps fets one is shorted. I remove it and power it up again. Current. Removed them all drive is 100% Good 30khrz square wave. All resistors and capacitors check good. So I'm leaning towards the transformer has a short somewhere.
I'm assuming the rectifiers at location BR1 and BR2 are not shorted.

Also, to be sure the current draw is caused by the transformer and not something in the output stages, remove BR1 and BR2 and check again for current draw.
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Old 15th February 2020, 09:30 AM   #18
rhempz01 is offline rhempz01  United States
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OK so without the rectifiers and no outputs in the curcuit. The amplifier does the same strange pulsating.
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Old 15th February 2020, 02:57 PM   #19
PapaZBill is offline PapaZBill  United States
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post a pic of the transformer and surrounding area and one overall top and bottom side.

Does the transformer have any hotspots, discolored windings? Is the core cracked? If you twist and turn the transformer does the pulsing stop?
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Old 15th February 2020, 05:23 PM   #20
rhempz01 is offline rhempz01  United States
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Transformer looks discolored behind the two legs and has some melted coatings.
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