sendai cd988bt

[t1412]

hi chaps, i'm looking at this car stereo for friend it's a sendai cd 988bt the problem is no sound i've powered it up by  using computer power supply and  just a bog standered speaker i have done  visual checks,  my thinking could output chip, any other test i could do would be great has i don't normal do stereo's but i'll have a go at anything. thanks for your time

regards
shaun