Kicker 350.2

mike49504 · 30th January 2012, 09:47 PM

Im only getting 4.37 volts on pins 8 and 11 of the 494

Any ideas?

brandes.cm · 30th January 2012, 10:15 PM

What about the rest of the pins? Most times 8,11 are tied to +12 not always. Depends if they sink or source. 4.37 seems correct if you have a square wave on them.

mike49504 · 31st January 2012, 01:22 AM

8 and 11 are tied to the + 12 vots so there is something wrong since i only have 4 volts on pins 8 and 11

brandes.cm · 31st January 2012, 03:47 AM

What do you have on all the pins?

Sent from my Punch 60.2

mike49504 · 04:29 AM

TL494

Pin 1:0.76
Pin 2:2.69
Pin 3:0.06
Pin 4:0
Pin 5:1.03
Pin 6:2.30
Pin 7:0
Pin 8:3.93
Pin 9:1.72
Pin 10:1.49
Pin 11:3.99
Pin 12:5.02
Pin 13:3.99
Pin 14:4.02
Pin 15:4.00
Pin 16:4.37

I also noticed Q1 has been meesed with at some point Its a B694..

Does anyone know which way it faces towards the transformer or away from it ??

brandes.cm · 31st January 2012, 01:36 PM

Trace pin 12 back and find out why 12V isn't present or lift it and see if it returns.

mike49504 · 31st January 2012, 02:26 PM

Anyone have a schematic for this amp ?

Or that can point me in the right direction i checked alot of stuff but i must be missing something since i dont get 12 volts on the 494 no lights no nothing

mike49504 · 31st January 2012, 02:31 PM

Ok Pin 12 connects to the middle leg of a B694 transistor..

Heres the voltages i get on the B694

Pin 1:13.92
Pin 2:0
Pin 3:13.89

Perry Babin · 31st January 2012, 02:51 PM

If that transistor isn't shorted from 1-3m follow the circuit back from pin 3. IT should go through a resistor and to an NPN transistor. Post the voltage on that NPN transistor.

brandes.cm · 31st January 2012, 02:57 PM

What connects to pin 1? That should be pulled low, maybe by another transistor?

30th January 2012, 09:47 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Kicker 350.2 Im only getting 4.37 volts on pins 8 and 11 of the 494 Any ideas?

31st January 2012, 03:47 AM	#4
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	What do you have on all the pins? Sent from my Punch 60.2 __________________ BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator

31st January 2012, 04:04 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	TL494 Pin 1:0.76 Pin 2:2.69 Pin 3:0.06 Pin 4:0 Pin 5:1.03 Pin 6:2.30 Pin 7:0 Pin 8:3.93 Pin 9:1.72 Pin 10:1.49 Pin 11:3.99 Pin 12:5.02 Pin 13:3.99 Pin 14:4.02 Pin 15:4.00 Pin 16:4.37 I also noticed Q1 has been meesed with at some point Its a B694.. Does anyone know which way it faces towards the transformer or away from it ?? Last edited by mike49504; 31st January 2012 at 04:29 AM.

31st January 2012, 02:51 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If that transistor isn't shorted from 1-3m follow the circuit back from pin 3. IT should go through a resistor and to an NPN transistor. Post the voltage on that NPN transistor. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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30th January 2012, 10:15 PM	#2
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	What about the rest of the pins? Most times 8,11 are tied to +12 not always. Depends if they sink or source. 4.37 seems correct if you have a square wave on them.

31st January 2012, 01:22 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	8 and 11 are tied to the + 12 vots so there is something wrong since i only have 4 volts on pins 8 and 11

31st January 2012, 01:36 PM	#6
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Trace pin 12 back and find out why 12V isn't present or lift it and see if it returns.

31st January 2012, 02:26 PM	#7
mike49504 diyAudio Member Join Date: Sep 2006	Anyone have a schematic for this amp ? Or that can point me in the right direction i checked alot of stuff but i must be missing something since i dont get 12 volts on the 494 no lights no nothing

31st January 2012, 02:31 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Ok Pin 12 connects to the middle leg of a B694 transistor.. Heres the voltages i get on the B694 Pin 1:13.92 Pin 2:0 Pin 3:13.89

31st January 2012, 02:57 PM	#10
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	What connects to pin 1? That should be pulled low, maybe by another transistor?

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