Question about Pioneer Audio Players & Recorders
Check to see that the electrolytic capacitors that are in the output stage circuits and driver stage circuits are not high in ESR.
Check to see that the power supply is in specs. The main electrolytic caps may not be up to specs. To test the power supply it is best to run a load test on it. You will need the proper setup for this.
The supply current to the output stage may be high, and thus causing the protection to turn on. You will need to have the service manual for details.
It is also possible that the speakers are too low impedance, or their crossovers are going defective and causing a miss-match for their loading impedance.
Look with a scope to see that there are no high frequency oscillations in the output of the amp going to the speakers. A common cause of this type of fault are worn de-coupler caps in the bias circuits for the various stages along the signal path.
Check to see that there is no DC out to the speakers with any position of the volume control with no signal going in. The speakers must be disconnected for this test. Do the same with a sine-wave signal from the test generator. 1 kHz is good to use for this test. Use a proper rated 8 ohm dummy load for your amplifier when applying the test signal. Do not put steady strong tone in to your speakers. You will have to refer to the service manual to know the allowable DC offset at the output stage to the speaker terminals. Most consumer amplifiers must be less than 50 mv. The higher end amplifiers are down to less than 10 mv.
It is also good to do a distortion test to see if there is too high a distortion that is causing the protection to trip.
You can also use the dummy load and the audio generator along with the scope to do power handling tests. This gets involved to put over this type of email.
These are only some basic examples of what to check. You will need the service manual, a scope, ESR meter, DVM, audio generator, and distortion analyzer to go through all the tests to find out where the fault is.
Posted on Jul 08, 2008
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Posted on Jan 02, 2017
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