Agalogue Tape Machine Alignment, how do you calibrate a tape machine Options

[mellotron]

i have a job offer to work in a studio. in order to get this job, i have to be able to align (calibrate) a tape machine. it has been a really long time since ive worked with an analogue tape machine, since everything has gone digital and everyone seems to be using hard disks. is there anyone who could point me in the right direction as far as a source to look at to learn this?