If the THAT2180 chip fails could that cause no output ?
If so can I remove it and jump pins 1 to 8 with a 1K resistor for testing ?
If so can I remove it and jump pins 1 to 8 with a 1K resistor for testing ?
It can cause no audio but it's more likely to cause the woofer to surge in and out when the gain control is turned.
You can jump it.
Post a photo of the board in the amp if you have any other questions.
You can jump it.
Post a photo of the board in the amp if you have any other questions.
Are you getting rail-rail oscillation on the output transistors?
This is a 'type-2' amp, if you have the tutorial. If not, this sony is of the same basic output design:
http://www.bcae1.com/temp/sony - XM-D400P5_Car Power Amplifier SM.pdf
This is a 'type-2' amp, if you have the tutorial. If not, this sony is of the same basic output design:
http://www.bcae1.com/temp/sony - XM-D400P5_Car Power Amplifier SM.pdf
Is the RCA jack shield broken under the jack?
Do you have audio on any/all of the output terminals of the op-amps?
Do you have audio on any/all of the output terminals of the op-amps?
Follow the audio signal from the back of the RCA jack to the first op-amp. At the very least, you should see signal at the non-inverting inputs of that op-amp.
I have a problem somewhere 3 out of the 4 opamps have voltage on all pins and the opamps are getting warm to the touch
The op-amps run a bit warmer in some of the MTX amps because they are run at the limits for voltage (±18v).
Do you mean that you have excessive DC on the output of the op-amps?
Do you mean that you have excessive DC on the output of the op-amps?
Did a voltage regulator fail?
Are the regulators for the op-amps producing positive and negative 18v?
Which op-amp has no DC on its output terminals?
Are the regulators for the op-amps producing positive and negative 18v?
Which op-amp has no DC on its output terminals?
1 of the 1N4746 diodes failed after replacing the opamps replaced it and now I have this problem .
So the opamps are likely defective again ?
So the opamps are likely defective again ?
When the diode failed, did the voltage go excessively high?
If so and these op-amps were in the circuit, they could be damaged.
One way you may be able to tell which (if any are damaged) is to compare the voltage on their inputs to their output. It could be only one that's defective (if any are).
If so and these op-amps were in the circuit, they could be damaged.
One way you may be able to tell which (if any are damaged) is to compare the voltage on their inputs to their output. It could be only one that's defective (if any are).
1 of the opamps has 20 volts on pin 1 and 0.66 volts on pins 2 and 3 and so on
The other op amps have 3 volts on the inputs and the output pins
The other op amps have 3 volts on the inputs and the output pins
Not sure but I have a broken solder connection somewhere pin 1 reads 20 volts if I push on the board the 20 volts drops to 0 volts I’m gonna check the board over to see if I can find the broken connection
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