Cheque Bounce Case

I was made CFO of my company for one year & during this tenure one cheque of loan repayment of a Pvt. Bank was dishonored & bank filed case u/s 138 on all the Directors, Signatories, Company secretary & CFO showing that these were responsible for day to day working of the company. Now Neither I signed loan documents nor any cheque moreover I was authorized to sign a cheque of Rs. 1.00 L only by BOD. So now my question is how far I can be convicted by court & what measures should I take to prove that I was not involved in day to day working of the company