Adv.Shashikumar, for exact cases on N.I.Act and IPC-420 please scout around on the Internet or in the Law Library. You are sure to find few of them.
1. N.I.Act parameters are independent of the IPC. There is no bar or restrictions in filing two different cases under N.I.Act and IPC. Neither the complainant is at an disadvantage for filing u/s 420-IPC.
2. Even if N.I.Act case is decided in favour of accused or dismissed in favour of accused. EVEN THEN there is no reason that IPC-420 cannot continue. The Trial court shall not dismiss the complaint u/s 420 IPC, EVEN IF ACCUSED IS ACQUITED OR COMPLAINT U/S 138 IS DISMISSED.
3. IT is an art & experience on part of the Advocate as to how to prepare & present both the cases and not be biased only in favour of N.I.Act vis-a-vis IPC. Depending on various documentary evidences that may be researched & generated, one can surely fix the Accused under IPC-420, EVEN if the accused is left out in N.I.Act.
4. MY perception is that if a Complainant's Advocate cannot prove the case under N.I.Act, (which is really a very simple and non-complicated Act) THEN THE SAID ADVOCATE SHOULD NOT TAKE UP MATTERS OF N.I.ACT.
PLEASE RE-READ & re-read & try to introspect on the last para of my original post. (reproduced again)
AS a standard routine, A complaint (case) should ALSO & ALWAYS be filed u/s 420 (IPC) against the Accused, in matters of 138 (N.I.Act). It serves GOOD its purposes and a non-compoundable criminal perception of the case is taken by the Magistrates court, literally assuring conviction AND / OR recovery of the cheque amount along with out-of-court interest settlement..
Keep Smiling .... Hemant Agarwal