peugeot 106 radio problem

Hi,
I have a standard radio/tape player in my peugeot 106 car. When i turn volume up you can only hear it slightly. On the display screen it comes up with 122 or somenumber. I tried putting in a tape and still with full volume you can only just hear it. How do i reset the radio it obviously has a code and i dont know what it is. What can i do to resolve this problem. Here is a picture of the radio:

http://img311.imageshack.us/img311/6968/phonestereo0020vk.jpg

please email back with any info or websites that may help.

regards

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