Hi, people.
I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.
Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to continue, but then it cut off completely and now there is no sound coming from the set at all.
I visually checked and tested some of the capacitors and couldn't find anything strange-looking. Now, some of you may recall my previous topic on my own CR4s and the zener/resistor heat issue. This amplifier has a very clear board and the area where the PCB in mine was burnt black is perfectly clean and green in this amplifier assembly, no scorch-marks. It's as if it wasn't used much.
I'd really like to try and fix this amplifier assembly and maybe keep it as a spare one.
What is the usual cause of an amplifier volume fading out to a complete silence on its own during playback?
What should I check? I am hoping that maybe it was left in a storage for some time and maybe some of the parts weakened. Since it started the playback normally and clearly, with no hissing or crackling, there must be something that gave way during the sound reproduction.
Thanks in advance for any assistance.
Take care, stay safe.
I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.
Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to continue, but then it cut off completely and now there is no sound coming from the set at all.
I visually checked and tested some of the capacitors and couldn't find anything strange-looking. Now, some of you may recall my previous topic on my own CR4s and the zener/resistor heat issue. This amplifier has a very clear board and the area where the PCB in mine was burnt black is perfectly clean and green in this amplifier assembly, no scorch-marks. It's as if it wasn't used much.
I'd really like to try and fix this amplifier assembly and maybe keep it as a spare one.
What is the usual cause of an amplifier volume fading out to a complete silence on its own during playback?
What should I check? I am hoping that maybe it was left in a storage for some time and maybe some of the parts weakened. Since it started the playback normally and clearly, with no hissing or crackling, there must be something that gave way during the sound reproduction.
Thanks in advance for any assistance.
Take care, stay safe.
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