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Re: I have only one side of the signal coming through...
More than likely either your RCA cables need to be replaced, or the tonearm is damaged. Do you use Ortofon Concorde cartridges by any chance? If so, the tonearm could be faulty, or the connection from your cartridge to your tonearm might be loose. Just tighten the nut a little bit more.
If you use different cartridges, then the issue is probably your RCA cables and need to be replaced.
IN either case, professional assistance is highly recommended.
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First determine if your amp is working. You can do this by putting your finger on the phono plugs that comes out from the terminals that your deck fits in. You should hear a buzz (if it's switched on). If you don't get a buzz then the pre-amp inside your amp may be faulty. This pre-amp failure will not affect any other functions on your Receiver.
Next thing to check is if the signal from the cartridge can reach the amp. You do this by removing the wires from the cartridge. While the amp is on and deck connected to it. Touch with your finger (one at a time) each of the four wires. On two you will little or no noise. On the other two you should hear on the left hand channel a buzz from one wire and on the other wire a buzz on the right. If you hear no buzz and the amp is working OK then there's a fault in the wires to the turntable or inside the deck.
If that is good, then you might need to make certain that connections to the cartridge are good.
I must say I have never come upon a record deck that will only play one side of a good condition record!
The only action I can suggest is to replace the belt if it's a belt driven deck. Please make a note of how it fits before removing the belt. But why any record deck would treat a new record any different on one side than the other will be a mystery to any good engineer.
The only exception would be if the deck played one side good then played up on every other record. Till it's switched off for a while, then repeats this action.
The cause of this fault would be a part overheating the longer the deck is left on. When you stop it to turn over, the system fails. This is however more likely to happen on a direct drive turntable, not a belt driven one.
Check all 4 wires that plug on to the cartridge are ok. swap the left/right inputs to the amplifier, if the sound only comes from the other speaker it is probably the cartridge or tonearm wiring at fault.
The mono button on your amp is simply feeding one channel to both sides, so is no indication that the other channel is working. Here's what to do. With the good channel comming off your deck, swap it over so it's going in the dead channel side on your amp. If the channel does not spring into life, it's not the record deck that is faulty, but your amp. Now your thinking but it works on CD! True, but the record deck socket on the amp has another pre-amp just for that purpose only. You can track this pre-amp down by following the wires from the socket.
If on the other hand the dead channel comes to life when you swap the jacks around, then it's is the deck. The most obvious fault being the cartridge. But some decks also have a pre-amp in them.
If you put the good channel from the deck into the right and then left phono imputs of your amp, the sound should come out from the left and right speakers. If it only comes out from the left, then the amp as a right hand channel fault. Now if other devices work on both channels, then it's the pre-amp for the phono socket that has a fault on it. You should be able to find this by following the wires from the phono socket. If you touch around that pre-amp you should get it to buzz on either channel (where it joins with the main pre-amp). Doing this with a screwdriver will pin-point where the faulty part is (working backwards). PS don't short anything by touching to bits of metal together with the screwdriver.
Magnetic cartridges need a small pre-amp before they can be past to the main pre-amp. That's why you can't hear anything with the deck plugged into another line socket.
If you get signal on both left and right speakers with the above test the deck is to blame.
First - Has the cartridge failed, or has a wire become lose to it? Have you checked the cable comming from deck?
If you have or none of these gives solves the problem, then try reversing the leads on the cartridge so the good ouput gets the missing channel. If you still can't hear it then there's a electronic fault on the left hand channel pre-amp inside the record deck.