Zx6400 hifonics strange protect mode - diyAudio
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Old 12th August 2013, 08:06 AM   #1
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Default Zx6400 hifonics strange protect mode

I have strange failure with this ampilifier.

When its powered first time (+12 remote) he go into protect mode.(but after 1,2seconds)

But if i reconect remote +12V ,
it dont show protect again and all working good.

After 30minutes of disconnected remote,all is doing again. So i need power on radio, power off and power on and its working normally.

I get if from car and connect on table and connect power supply, other speaker and going the same way so it's not the fault system in the car.


Also its happen without connected RCA in audio.

So its problem with ampilifier.

All capacitor in converter was changed 4years ago so i thinking its other problem.

Voltage at output converter is about 31V at both side (+,-) -looks as good.

I dont have any idea what could be wrong here?

I have osciloscope.

This looking like some capacitor is bad,but i dont know where to looking..
No schematic

Last edited by rafcio363; 12th August 2013 at 08:12 AM.
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Old 12th August 2013, 09:07 PM   #2
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I'd suggest checking the voltage on the KA7500 (or TLx94). Measure the voltage on all pins when in protect and when playing. That will tell you which pin is shutting it down and may help you follow the protection circuit back to the fault.

If you can't find the fault, post a good quality photo of the power supply driver board.
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Old 12th August 2013, 09:39 PM   #3
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Yes,you have right i checked this today.
He is going into protect becouse on operational amplifier is too high voltage.

Should be 1.44V on both diodes which in to 16pin TL 494. (measured before diodes)
Diodes are connected to operational amplifier from second side.

1 diode is going into thermal check and that is ok

2 diode is going somewhere (i supose that is checking voltage at speaker output)

When its protect i have 11,5V on second diode - so there is way of failure.

But i need more time to check more

Last edited by rafcio363; 12th August 2013 at 09:43 PM.
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Old 18th August 2013, 12:21 PM   #4
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I've found that is problem from one channel output, when i disconnect one channel from protect circuit all its ok.

But i stil dont know why protect is on after first powered.

Volatage which going into protect line is equal when i powered it first time (and protect on) and second time (protect off).

2 capacitors in channel i changed.
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Old 20th August 2013, 02:22 AM   #5
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It appears that you've disconnected (J16?) the 200 series channel, not the 100 series channel with the rectangle around it. I'm assuming that the power supply is on the right side of the photo posted.
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Old 22nd August 2013, 07:40 PM   #6
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This trace was bad.

I found where is problem.
In one channel at output (at 2 emiter resistors 0.1 Ohm 5W) is big distortion after first power ( i've checked it with osciloscope) when i disconnect this channel output from protect checking , amplifier started normally.

I compare signal at others output and this distortion after first powering exisiting only in this one channel.
Probably i need find preamp and disconnect (or swap with other channel) from this channel to exclude preamp damage.
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Old 23rd August 2013, 06:22 AM   #7
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Input from preamp founded, but 30min after power to check again really slows me work :P
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Old 25th August 2013, 12:17 PM   #8
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Disortion (protect mode) exising only when switch 3/4ch is on low pass filter.

I've crossed switch and still disortion after first powered.

So i need check operational amplifiers (4558) which generate Low pass filter.
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Old 25th August 2013, 06:25 PM   #9
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I cant find source of disotrion is too small before amplfier to looking it on osciloscope.
All electrolit capacitors near all 4558 changed without succes.

Last edited by rafcio363; 25th August 2013 at 06:27 PM.
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Old 26th August 2013, 10:25 AM   #10
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If you troubleshoot it with no speakers connected, you can drive a stronger signal into it which will make it easier to find.
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