I'n trying to fix a M&S SYSTEM DMC-1which have following problem:
I'm using FM station to do this fix, I works perfect if volume below around 8 or if bass is set to zero, the sound can go to 20 without problem, but if I set bass to maximum and try to go over 10 the sound comes distorted ... I saw a video on YouTube the person saying about the main capacitors on the power portion, but I disconnect the main transformer and inject direct to the capacitors PINs my bench power supply -23v 0v +23v, but still distorted so I think the problem is not the capacitor neither the transformer
The consumption is less than 500ma in both line (-23v +23v)
I connected an oscilloscope on the audio out (together with the speaker), and I noticed that the voltage Peak-to-Peak on the speaker is less than 10V while working good (high volume not bass, or low volume with bass), but if I increase the bass and the volume the peak-to-peak on the speaker goes to around 20v-23v and the sound comes distorted.
Any tip is welcome.
I'm using FM station to do this fix, I works perfect if volume below around 8 or if bass is set to zero, the sound can go to 20 without problem, but if I set bass to maximum and try to go over 10 the sound comes distorted ... I saw a video on YouTube the person saying about the main capacitors on the power portion, but I disconnect the main transformer and inject direct to the capacitors PINs my bench power supply -23v 0v +23v, but still distorted so I think the problem is not the capacitor neither the transformer
The consumption is less than 500ma in both line (-23v +23v)
I connected an oscilloscope on the audio out (together with the speaker), and I noticed that the voltage Peak-to-Peak on the speaker is less than 10V while working good (high volume not bass, or low volume with bass), but if I increase the bass and the volume the peak-to-peak on the speaker goes to around 20v-23v and the sound comes distorted.
Any tip is welcome.
So let’s take...
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