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Old 3rd November 2007, 11:38 PM   #11
cod3gen is offline cod3gen  Norway
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okey.
the thermal protection, isnt it in the output transistors area?


i can`t find the component named TL494, but i found some other, KIA494P is this correct?
do you mean i should power the amp up now, and measure it?
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Old 4th November 2007, 12:24 AM   #12
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There is thermal protection in both the audio and power supply sections. The thermal protection for the audio section is on the output transistors. The thermal protection for the power supply is on the transformers. The power supply transistors don't really generate any heat. If you'd like to add additional protection, it won't do any harm (as long as it's properly designed).

The KIA494 is essentially the same as the TL494.
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Old 4th November 2007, 01:50 AM   #13
cod3gen is offline cod3gen  Norway
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okey.

should i power the amp up now, without the transistors and check to see if the voltage is correct?
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Old 4th November 2007, 02:02 AM   #14
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Yes. Power it up without the FETs (in the blown supply) and measure the voltage on the IC.
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Old 4th November 2007, 12:18 PM   #15
cod3gen is offline cod3gen  Norway
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okey, on pin 9 and 10 i measured 3 volts, and on pin 9 and 11 i measured 10 volts and pin 10 and 11 i measured 13 volts..
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Old 4th November 2007, 08:45 PM   #16
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You need to measure the voltage with the black lead on the chassis ground terminal.

The 110 ohm 1w resistors need to be in the circuit.
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Old 6th November 2007, 05:00 PM   #17
codegen is offline codegen  Norway
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okey.
i measured following:

Pin 9: 6volts
Pin10: 15volts
Pin11: 16,3volts
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Old 6th November 2007, 10:59 PM   #18
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The voltage on pin 10 is too high. It should be the same as pin 9. If the 110 ohm resistors are within tolerance and there is nothing pulling pin 10 high, the IC is very likely defective (there are a few faults that can cause strange output from this IC). The 110 ohm resistor conected to pin 110 would be operating at a very high temperature with 15v across it. If it's not hot, it's likely open (or far out of tolerance).

If you can provide a complete set of voltages (from all 16 pins), it would be easier to be able to determine if the IC is defective.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 7th November 2007, 02:40 PM   #19
codegen is offline codegen  Norway
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Okey, i measured following:
1:0,49v
2:0,86v
3:0,07v
4:0,32v
5:1,53v
6:3,70v
7:0v
8:16,41v
9:6v
10:15,19v
11:16,4v
12:16,4v
13:4,95v
14:4,95v
15:4,95v
16:0v

Also noticed that the conductive area got abit hot under the measure ments, but im not sure if its only the resistor overheating.

damn, did i really have an account all along in this place.. i thought someone else used the same nick
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Old 7th November 2007, 05:02 PM   #20
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It looks like the KIA494 is defective. A TL494CN or TL594CN (my recommendation) are good replacements.
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