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.
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:
Sorry for the late reply, due to time difference i work in kuwait.
The DC voltage on IC 3 with the output transistors in the circuit is as follows:
Pin 1: 0.19
Pin 2: 0
Pin 3: 0
Pin 4: -21.33
Pin 5: 0
Pin 6: 0
Pin 7: 0.20
Pin 8: 21.40
The above reading is with power supply of 12Volts
The DC voltage on IC 3 with the output transistors in the circuit is as follows:
Pin 1: 0.19
Pin 2: 0
Pin 3: 0
Pin 4: -21.33
Pin 5: 0
Pin 6: 0
Pin 7: 0.20
Pin 8: 21.40
The above reading is with power supply of 12Volts
The ressistance of the output transistors outside the circuit is as follows:
q13
E -C :2.35
E-B:2.371
Q15
B-E:3.198
C-E:3.016
Q16
B-E:3.020
C-E:2.834
Q14
E-C:1.940
E-B:2.272
THE READINGS ARE IN MEGA oHMS
I PRESUME THE TRANSISTORS ARE FINE AND CAN BE USED, KINDLY ADVICE....
q13
E -C :2.35
E-B:2.371
Q15
B-E:3.198
C-E:3.016
Q16
B-E:3.020
C-E:2.834
Q14
E-C:1.940
E-B:2.272
THE READINGS ARE IN MEGA oHMS
I PRESUME THE TRANSISTORS ARE FINE AND CAN BE USED, KINDLY ADVICE....
Thanks Perry i will try that out but why is it not coming out of protect, the led light is still red, isn't IT suppose to be green if all is fine. All the testing i have done is with out giving any input signal and without connecting the speaker.
I haven't yet fasten the output to the heat sink, i guess its fine for testing purpose as long they dont get very hot, kindly advice....
I haven't yet fasten the output to the heat sink, i guess its fine for testing purpose as long they dont get very hot, kindly advice....
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