Make sure all your speaker connections and your phono lead connections are good and connected properly.also if you have the correct source(input for cd player etc.)pressed in,this could also be the correct speaker setting(a or b speakers)if your amplifier has a+b settings.check your speakers at the back to see if there are any switches,or if they are bi wirable(if they are bi wireable you will need two sets of wires running to both speakers from both speakers (a) and the (b) terminals,as if this was the case and you are only using 1 set of cables then only the treble may be working without any bass or the other way around.you could also look at your phono leadsby giving them a light twist to see if there are bad connections,if not if you can try and ask a friend or neighbour to try the speakers on their sound system and then you will know if its your amp or speakers that have the problem.i suspect it is your amp,if you have tried these things and got nowhere then you may have blown your output transisters and would be better off getting a new amplifier as it would cost too much to repair.only you know when the problem started and if it was by playing the amplifier too loud for too long then the volume dropped right down the it is probably the transisters that have been blown.hope this helps
Answers & Comments
Make sure all your speaker connections and your phono lead connections are good and connected properly.also if you have the correct source(input for cd player etc.)pressed in,this could also be the correct speaker setting(a or b speakers)if your amplifier has a+b settings.check your speakers at the back to see if there are any switches,or if they are bi wirable(if they are bi wireable you will need two sets of wires running to both speakers from both speakers (a) and the (b) terminals,as if this was the case and you are only using 1 set of cables then only the treble may be working without any bass or the other way around.you could also look at your phono leadsby giving them a light twist to see if there are bad connections,if not if you can try and ask a friend or neighbour to try the speakers on their sound system and then you will know if its your amp or speakers that have the problem.i suspect it is your amp,if you have tried these things and got nowhere then you may have blown your output transisters and would be better off getting a new amplifier as it would cost too much to repair.only you know when the problem started and if it was by playing the amplifier too loud for too long then the volume dropped right down the it is probably the transisters that have been blown.hope this helps