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Old 30th January 2012, 09:47 PM   #1
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Default Kicker 350.2

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


Any ideas?
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Old 30th January 2012, 10:15 PM   #2
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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.
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Old 31st January 2012, 01:22 AM   #3
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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
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Old 31st January 2012, 03:47 AM   #4
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What do you have on all the pins?

Sent from my Punch 60.2
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Old 31st January 2012, 04:04 AM   #5
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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.
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Old 31st January 2012, 01:36 PM   #6
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Trace pin 12 back and find out why 12V isn't present or lift it and see if it returns.
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Old 31st January 2012, 02:26 PM   #7
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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
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Old 31st January 2012, 02:31 PM   #8
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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
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Old 31st January 2012, 02:51 PM   #9
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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.
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Old 31st January 2012, 02:57 PM   #10
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What connects to pin 1? That should be pulled low, maybe by another transistor?
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