You should have the same voltage on pin 3 of the LM339 as you do on pin 1 of the vertical board. Has the voltage changed significantly on the vertical board's pins?
Have you confirmed that the fuses are not blown, that you have voltage (~12v) on both the remote and B+ terminals, and also have good ground?
Have you confirmed that the fuses are not blown, that you have voltage (~12v) on both the remote and B+ terminals, and also have good ground?
ok, so I'll replace that and then we go back to the way it was and continue checking voltages on the rest. Do you have a model number for this transistor? I can't seem to find anything written on it.
It likely has DK printed on it. If so, it's likely a KTA1661. If you want to continue troubleshooting, you can solder legs 2 and 3 together. You'll have to remove B+ to shut the amp down.
If you want to be safe, you should use a fused jumper (3 amp max) to connect leg 2 to leg 3. This will help protect the board if there is a short that caused the transistor to fail.
If you want to be safe, you should use a fused jumper (3 amp max) to connect leg 2 to leg 3. This will help protect the board if there is a short that caused the transistor to fail.
LM339
Pin 1: 6.52
Pin 2: 0
Pin 3: 6.45
Pin 4: 6.45
Pin 5: 0
Pin 6: 6.45
Pin 7: 0
Pin 8: 6.45
Pin 9: 6.45
Pin 10:1.0
Pin 11: 6.45
Pin 12: 6.45
Pin 13: 6.05
Pin 14:6.45
and ground terminals of the amp?changed power source due to problems with the other. I have 12v on b+ and ground...
Does pin 1 of the vertical board have only 6v on it? no, it has b+ voltage on pin 1 and pin 5
Are you sure you have the pin configuration correct. Pin 12 should be at 0v. looking at the dimple from front, i started on the right side and worked my way around..
Does pin 1 of the vertical board have only 6v on it? no, it has b+ voltage on pin 1 and pin 5
Are you sure you have the pin configuration correct. Pin 12 should be at 0v. looking at the dimple from front, i started on the right side and worked my way around..
Look at the pin numbering on the attached image.
You need to list the voltages again and you need to determine why you have only 6v on pin 3 but have 12v on pin 1 of the driver board. They should be connected directly together (~0 ohms between them).
You didn't say what the problem was with your original supply. Was the voltage on it low?
You need to list the voltages again and you need to determine why you have only 6v on pin 3 but have 12v on pin 1 of the driver board. They should be connected directly together (~0 ohms between them).
You didn't say what the problem was with your original supply. Was the voltage on it low?
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