Hifonics XX-Cyclops - Page 2

brandes.cm · 4th December 2012, 09:41 AM

Its a DC spike.

Perry Babin · 4th December 2012, 05:00 PM

If you have DC, that's why the relays aren't engaging. The problem is likely on the driver board but you should confirm that all regulators are producing the correct output voltage and that those voltages are reaching the driver board pins.

brandes.cm · 5th December 2012, 01:41 AM

Sometimes the relay pulses on then off.

I don't see the -15VDC on any pins of the driver card. The regulator is working, just nothing ohms out to the module.

The ext2000D schematic doesn't map the module pins correctly.

Perry Babin · 5th December 2012, 02:19 AM

No -15v. See attached.

brandes.cm · 31st March 2013, 04:23 PM

Voltages seem fine with the driver card removed. The two fets that tie to U5 pin 12 seem to fail constantly. I get no oscillation on the gates of any output fets.

Perry Babin · 31st March 2013, 07:09 PM

Are the FETs failing before the amp ever produces oscillation?

brandes.cm · 31st March 2013, 07:15 PM

Correct, I see no oscillation and the fet(s) fail.

Perry Babin · 31st March 2013, 07:35 PM

That would tend to indicate that there is an open circuit between that pin and the FETs that's letting the gate voltage float. The connection could be intermittent.

brandes.cm · 31st March 2013, 09:07 PM

All gates are driven to the negative rail with no oscillation. I should note those fets fail when I have the protection circuit removed, D206. Otherwise the amp will go straight into protect.

Perry Babin · 1st April 2013, 02:35 PM

If you remove all of the FETs driven by U5, does the amp power up and produce audio?

4th December 2012, 09:41 AM	#11
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Its a DC spike. __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

4th December 2012, 05:00 PM	#12
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you have DC, that's why the relays aren't engaging. The problem is likely on the driver board but you should confirm that all regulators are producing the correct output voltage and that those voltages are reaching the driver board pins. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

5th December 2012, 01:41 AM	#13
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Sometimes the relay pulses on then off. I don't see the -15VDC on any pins of the driver card. The regulator is working, just nothing ohms out to the module. The ext2000D schematic doesn't map the module pins correctly. __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

31st March 2013, 04:23 PM	#15
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Voltages seem fine with the driver card removed. The two fets that tie to U5 pin 12 seem to fail constantly. I get no oscillation on the gates of any output fets. __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

31st March 2013, 07:09 PM	#16
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are the FETs failing before the amp ever produces oscillation? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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31st March 2013, 07:15 PM	#17
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Correct, I see no oscillation and the fet(s) fail. __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

31st March 2013, 07:35 PM	#18
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That would tend to indicate that there is an open circuit between that pin and the FETs that's letting the gate voltage float. The connection could be intermittent. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

31st March 2013, 09:07 PM	#19
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	All gates are driven to the negative rail with no oscillation. I should note those fets fail when I have the protection circuit removed, D206. Otherwise the amp will go straight into protect. __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

1st April 2013, 02:35 PM	#20
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you remove all of the FETs driven by U5, does the amp power up and produce audio? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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