convergence problems

["Dr. Daniel Glossman" <glossman.,at,.yakko.cimav.edu.mx>]

Dear netters:
 I am trying to get the energy of a molecule using the CBS-Q method included
 in G98. I've tried everything I found in the manuals and books, but it failed
 to converge.
 The molecule is a radical cation, positive 1,2,3-thiadiazole.
 For if there is somebody (with spare time) willing to try it and help me,
 I am including the input:
 %chk=23tcbsqp
 #p CBS-Q Test
 positive 1,2,3-thiadiazole - CBS-Q energy calculation
   1   2
  S
  N,1,R2
  C,1,R3,2,A3
  N,2,R4,1,A4,3,0.,0
  C,3,R5,1,A5,2,0.,0
  H,3,R6,1,A6,2,180.,0
  H,5,R7,3,A7,1,180.,0
       Variables:
  R2=1.67754496
  R3=1.72225201
  R4=1.19948006
  R5=1.35757068
  R6=1.075501
  R7=1.07151657
  A3=91.72935644
  A4=107.53925482
  A5=110.25406768
  A6=122.34970766
  A7=132.97856753
 The input geometry comes from a geometry optimization at the HF/6-31(d'),
 which is the first step in the CBS-Q energy calculation. The process fail
 to converge during the 3rd step, that is, the MP2(full)/6-31G(d') geometry
 optimization.
 Any hints on how to solve this problem will be appreciated.
 Thanks in advance. Best regards
                                                                         =
 Dr. Daniel Glossman Mitnik
 *************************************************************************=
 ***********
 Dr. Daniel Glossman Mitnik
 Centro de Investigaci=F3n en Materiales Avanzados (CIMAV)
 Departamento de Pol=EDmeros                                              =
          Phone: (52) 1 4391151
 Miguel de Cervantes 120                                                  =
           FAX: (52) 1 4391112
 Complejo Industrial Chihuahua                                            =
         E-mail: glossman.,at,.mail.cimav.edu.mx
 Chihuahua, Chih. 31109                                                   =
                       glossman.,at,.hotmail.com
 Mexico
 *************************************************************************=
 ***********