Kenwood Kac-5201

[michaeleleanor]

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 3 at pin 7 I am getting -7volts when the voltage is suppose to be 0.1 volt, can some one advice me which parts should i check to identify the problem, this is the reading after removing the IC

 

[michaeleleanor]

with the ic3 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

 

[michaeleleanor]

voltage on circuit board after removing the ic3

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