  The series of the experiments on precise mass measurement of $J/\Psi$-,
$\Psi'$- mesons have been performed in 2002-2004. Energy calibration has been
done with the help of the resonant depolarization technique. The present paper
discusses the influence of the vertical orbit distortions on the accuracy of
the energy calibration. The sources of the orbit distortions are misalignments
of the quadrupoles and sextupoles in vertical plane and kicks of the vertical
correctors. Comparison with previously published papers is presented.
