Notice u/s 148 is issued when there is some income which has been ESCAPED from Assessment or there was income but you didn't show it. It is issued before making INCOME ESCAPING ASSESSMENT u/s 147.
If all the receiving is being clarified with proper explanation and Officer is satisfied then there would not be any trouble.
And there must be Explaination mentioned in the Notice that what are the REASONS TO BELIEVE that Income has escaped. If you don't have any knowledge on Basis of which Notice has been issue, You could asked the Officer to supply the REASONS TO BELIEVE.
Once you got the Reasons you should check that and prepare your Explaination for that. Be it cash deposit or any unexplained income found by AO etc.
This Notice is not something to be worried about if you could explain everything mentioned in it.
But yes I would suggest that you should contact any CA if you feel trouble in the procedure.
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