CD Player Settings Help

Hi, I have a problem with my CD player. It is a sony CDX-S2200 which i bought from a mate and he didn't have the manual.

anyway, the volume is preset to 28 and everytime i switch the engine on it comes on at 28. also when i turn the volume up it jumps up to 24 everytime, so to knock it up by 1 i have to turn it up and back down again.

Does anyone know what the problem could be and how to sort it?

Thanks
 
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