Problem HITACHI HT25S Z AXIS ISSUE

Hello All,
Most of the time when I start up the 1988 Hitachi Seiki lathe with a MULTI Control, I get these Alarms after I press the STAND BY button,
ALARM 392 Z-AXIS TG DISCONNECTED
ALARM 390 SPINDLE TG DISCONNECTED
ALARM310 POWER FOR SERVO NOT SUPPLIED
ALARM 280 NOT READY

The machine fires up sometimes others it goes in to the above alarm states.
Could someone help me with what could cause a intermittent issue I am having.
Thank You Skeney