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Old 7th November 2013, 11:57 AM   #1
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Default Kenwood kac-5201

Hello Everyone,

I would appreciate if some one helps me in fixing my car amplifier KAC-5201.
While playing it on high volume the amp hot burned, i have changed the power supply fets and the resistor (R91-94), i have attached the schematic .
on powering on it, it still remains in protection mode, i have checked the voltages on IC1,2,3,4 all the readings are correct as per the schematic except in IC 4 at pin 7 I am getting 5volts when the voltage is suppose to be 1.2 volt, can some one advice me which parts should i check to identify the problem.

Last edited by michaeleanor; 7th November 2013 at 12:02 PM.
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Old 7th November 2013, 12:03 PM   #2
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I can pm the schematic
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Old 7th November 2013, 12:17 PM   #3
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IC4 pin 7 is ground and should read 0v.
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Old 7th November 2013, 01:08 PM   #4
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Hi Perry my mistake I meant ic 3 pin 7 should have 0.1 volt but its giving me 5volts
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Old 7th November 2013, 01:12 PM   #5
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Post the DC voltage on all pins of that IC. Copy and paste the following list.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
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Old 7th November 2013, 03:13 PM   #6
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with the ic in

Pin 1: -20.20
Pin 2: 0.08
Pin 3: 0
Pin 4: -21.56
Pin 5: 0
Pin 6: 0
Pin 7: -20.30
Pin 8: 21.74
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Old 7th November 2013, 03:16 PM   #7
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voltage on circuit board after removing the ic

Pin 1: 1.40
Pin 2: -0.80
Pin 3: 0
Pin 4: -22.09
Pin 5: 0
Pin 6: 0
Pin 7: -6.40
Pin 8: 22.14
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Old 7th November 2013, 05:31 PM   #8
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What is the DC voltage measured directly across the left channel speaker terminals?
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Old 7th November 2013, 06:23 PM   #9
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All the above readings that I have given is after removing the output transistor from the circuit, will check and post the dc voltage across the left channel speaker terminals.

Thanks Perry for your assistance
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Old 7th November 2013, 06:39 PM   #10
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Hi Perry the voltage is 0 both right and left channel
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