99-02E

The analysis of the thermodynamic properties of the pseudospin--electron model in the case of absence of the electron correlation is performed. It is shown that interaction between the electron and pseudospin subsystems leads in the $\mu $=const regime to the possibility of the first order phase transition at the temperature change with the jump of the pseudospin mean value $\langle S^z\rangle$ and reconstruction of the electron spectrum. In the regime $n$=const an instability with respect to the phase separation in electron subsystem can take place for certain values of the model parameters.