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Old 1st June 2011, 04:19 AM   #1
timwebb is offline timwebb  United States
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Default kicker 1200.1

i got had a blown power supply. i replaced the drive transistors with MMBTA56.
also the 494 ic gets to warm and the drive transistors over heat.
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Old 1st June 2011, 09:53 AM   #2
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Does the amp produce rail voltage before the driver transistors overheat?

If not, do you get a square wave output on pins 9 and 10 of the 494?
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Old 1st June 2011, 11:35 AM   #3
timwebb is offline timwebb  United States
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this is the signal from the 494 pin 9-10. volts div-.5 time div- 2us
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Old 1st June 2011, 11:38 AM   #4
timwebb is offline timwebb  United States
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this is the signal on q11.and there are no transistors in the power supply.
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Old 1st June 2011, 02:10 PM   #5
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Which pin of Q11?

Does the same pin on Q5 look the same?

What's the DC voltage on pins 11 and 12?
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Old 2nd June 2011, 02:35 AM   #6
timwebb is offline timwebb  United States
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Q11 on the emitter
pin 11 10.74
pin12-11.45

the amp goes in protect with Q5 in the circuit so i pulled it.
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Old 2nd June 2011, 10:20 AM   #7
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If that was the emitter and the base has the same signal as pins 9 and 10 on the 494, the a56 is defective.
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Old 5th June 2011, 01:42 AM   #8
timwebb is offline timwebb  United States
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i pulled the drive transistor and the signal still the same.
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Old 5th June 2011, 02:56 AM   #9
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Replace the driver transistor with a new MMBTA56.
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Old 5th June 2011, 06:00 PM   #10
timwebb is offline timwebb  United States
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ok i did now im getting 1v on the gate resistor.for q11
q5 is getting 5v at the gate resistor. i cant find what is pulling Q11 down.
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