Kicker ZX450.2

mike49504 · 26th February 2012, 12:17 AM

Amp is stuck in protection mode..

Heres what i have on the 494

Pin 1:1.23
Pin 2:3.68
Pin 3:4.74
Pin 4:6.63 and keeps climbing
Pin 5:1.48
Pin 6:3.39
Pin 7:0
Pin 8:0.26
Pin 9:0
Pin 10:0
Pin 11:0.27
Pin 12:13.90
Pin 13:5.00
Pin 14:5.00
Pin 15:5.00
Pin 16:12.79

Thoose readings are with the rectifiers out of circuit..

Any ideas??

Perry Babin · 26th February 2012, 11:34 PM

Post a photo of the board. I don't have any information on that amp.

mike49504 · 27th February 2012, 12:16 AM

Heres a couple pics of the board..

Perry Babin · 27th February 2012, 12:33 PM

There are two long jumpers for the protection circuit. Pull them one at a time to see which one is causing the amp to go into protect.

Clamp all transistor and use a current limiter. The amp may try to draw excessive current.

mike49504 · 27th February 2012, 11:25 PM

I pulled the 2 jumpers circled in blue amp still doesnt power up..

Pin 16 of the 494 is still at 12.89 volts..

Perry Babin · 28th February 2012, 11:39 AM

What's driving pin 16?

If it goes back to a transistor, pull that transistor.

mike49504 · 28th February 2012, 10:58 PM

I pulled Q1 (A1359) and followed the trace in the other direction as well and pulled Q6 ..

Both transistors are connected to pin 16..

I got the voltage to drop to 4.36 volts on pin 16 amp is still dead..

Perry Babin · 29th February 2012, 12:45 AM

If pin 15 is still at 5.0v, something else is also causing the IC to shut down. Post the voltages again or at least the ones that have changed.

mike49504 · 01:04 AM

I put Q1 back in the amp and this is what i get now..

Pin 1:0.83
Pin 2:2.39
Pin 3:0.06
Pin 4:0
Pin 5:1.48
Pin 6:3.40
Pin 7:0
Pin 8:12.01
Pin 9:5.01
Pin 10:5.01
Pin 11:12.01
Pin 12:13.88
Pin 13:5.00
Pin 14:5.00
Pin 15:5.00
Pin 16:4.36

Perry Babin · 29th February 2012, 12:59 AM

What are the numbers on the transistors?

26th February 2012, 12:17 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Kicker ZX450.2 Amp is stuck in protection mode.. Heres what i have on the 494 Pin 1:1.23 Pin 2:3.68 Pin 3:4.74 Pin 4:6.63 and keeps climbing Pin 5:1.48 Pin 6:3.39 Pin 7:0 Pin 8:0.26 Pin 9:0 Pin 10:0 Pin 11:0.27 Pin 12:13.90 Pin 13:5.00 Pin 14:5.00 Pin 15:5.00 Pin 16:12.79 Thoose readings are with the rectifiers out of circuit.. Any ideas??

26th February 2012, 11:34 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post a photo of the board. I don't have any information on that amp. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

27th February 2012, 12:33 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There are two long jumpers for the protection circuit. Pull them one at a time to see which one is causing the amp to go into protect. Clamp all transistor and use a current limiter. The amp may try to draw excessive current. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

28th February 2012, 11:39 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's driving pin 16? If it goes back to a transistor, pull that transistor. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

29th February 2012, 12:45 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If pin 15 is still at 5.0v, something else is also causing the IC to shut down. Post the voltages again or at least the ones that have changed. __________________ 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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28th February 2012, 10:58 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	I pulled Q1 (A1359) and followed the trace in the other direction as well and pulled Q6 .. Both transistors are connected to pin 16.. I got the voltage to drop to 4.36 volts on pin 16 amp is still dead..

29th February 2012, 12:58 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	I put Q1 back in the amp and this is what i get now.. Pin 1:0.83 Pin 2:2.39 Pin 3:0.06 Pin 4:0 Pin 5:1.48 Pin 6:3.40 Pin 7:0 Pin 8:12.01 Pin 9:5.01 Pin 10:5.01 Pin 11:12.01 Pin 12:13.88 Pin 13:5.00 Pin 14:5.00 Pin 15:5.00 Pin 16:4.36 Last edited by mike49504; 29th February 2012 at 01:04 AM.

29th February 2012, 12:59 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What are the numbers on the transistors? __________________ 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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