R706SW 1994 inking unit problem

My machine have a problem as photo, inking unit@ not ready for operation, 7h30-11h30am and 1-5pm.
Out of working time, inking unit@ not ready don’t appear.
Anyone help me, how about it.

 

Turn off the ink ductor on 1st PU. Then PU2
You have a problem with the inverter or motor.
I already wrote to you by mail. PU1 or PU2

 

PU1 and PU2 don’t use.
Workpost and make ready are still not active, that error appear.

Positioning computer of the inking unit was reset automatically, PU4 PU5 and PU6

 

You have removed boards from a process with the power on. You need to find what is damaged. It won't work by writing in a forum. My opinion. The machine has old software. The entire process needs to work. You can't just turn off the PU from the central console.