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are you using a phonograph with a built-in preamp? If so, then you need to hook it up to a different input. Phono input is only for non-amplifier phonographs, otherwise you will over-drive the amp.
There are at least two problems, audio output problems, "ic" to the laser pickup assembly none functional. From the description you would be further ahead replacing the Audio Shelf System rather than spending money on repairing it.
In reference to the question - " what does cera and mag on the back of the mixer mean? " these jacks are for the input of phonograph record cartridge signals. Phonograph cartridges are of two types - 1. "Cera"mic (ceramic) cartridges generate their signal using a ceramic crystal which provides almost 1/2 a volt of current. 2. "Mag"netic (magnetic) cartridges generate a more accurate signal than a ceramic cartridge but the magnetic cartridge generates its signal using a moving-magnet mechanism (rather than a ceramic crystal) and the magnetic cartridge generates much less current than a ceramic cartridge, so its signal needs a lot more amplification than a ceramic crystal's output. So the two jacks on the back of the mixer provide different levels of amplification for the phono cartridges, less amplification for a ceramic cartridge and more amplification for a magnetic cartridge. Since few people play phonograph records any more it is understandable that the public has little knowledge of the differences between ceramic and magnetic cartridges. But each have their own benefits and usually ceramic cartridges are cheaper than magnetic cartridges simply because it takes a lot more sophisticated manufacturing technology to make a magnetic cartridge, though magnetics are usually preferred over ceramics because of their more accurate generation of a signal from the wiggling groove in a phonograph record. But for those who can hear, the complete sound signal from a phonograph record is much preferred over the dead and dry sampled sound from a digital CD. And the old 1/4" reel-to-reel tape recordings are the highest sound quality of all because they are direct copies of the original magnetic tape masters with no digitizing at all. The fullness of their sound is astounding compared to any digitized signal.. A mag input is down at the mic level. A ceramic input is almost up at the line level.
Could be two separate faults. First a switch that does not make contact when you move the arm. Then dirt on the CD lens.
If you can hear sound from any other function it is unlikely to be an IC problem.
you will need a little box called a pre-amp. This hooks up between the turntable and newer receivers without a phono input. A basic explaination & drawing of this type of setup can be found here
Unless you have a choice of inputs, nothing.
If available, you can try a magnetic cartridge input which is much more sensitive than 'Line.'
It may be screechy though, different curve.
Sounds like an internal prob within the reciever, since recievers have radio tuners in em, maybe a prob in the input switching in it.
I assume you are running unbalanced rca cables out of the dvd player into the reciever as it probably doesn't have balanced input capability, unbalanced lines are susceptible to R.F.I. ( radio frequency interference ) but I doubt if that's the problem here unless maybe you are running very long cable lengths from the dvd player to the reciever.
Try using a different input and see if the problems still there, can use any input other than phonograph really as they are all line level inputs.
I am not really familar with this receiver but almost all phonograph must go into a phono in. Due to the fact that a phonograph does not have whats called a pre amplifier. generally the receivers have a phono in and that input has an more sensitive amplifier cicuit in the input. That is why if you plug it in to something else unless it has a preamplifier the sound will be real soft. I think Radio Shack sells a amplifier you plug the Phonograph into one side and the other side into the receiver then you can use any input you choose.
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