Factor analysis - FACTORAN how to impose restrictions

I have a dataset of 17 variables and 480 observations, matrix=(480,17). I use FACTORAN to compute the maximum likelihood estimate of the factor loadings matrix with 3 common factors, lambda=(17x3) ; but i previous need to impose some restrictions on the factors of lambda. I need that: the first row is equal to [1 , 1, 0]; the 9th row equal to [1 , 0.5, 0]; the 17th row equal to [1 , 0, 0]; but i don't know how to impose these restrictions in Factoran.

Thanks for the help

Matteo