Hitachi GR4000 Series Installation Manual page 199

Step 2
Figure 5.5-2 below. (The basic control unit will come out 15mm or so towards you.)
Lever
Figure 5.5-2 Basic control unit unlocked
*
*
520-10-014-20X
Open the big levers (not the small ones) towards the direction indicated in
NOTE: When removing a basic control unit from the slot, do it holding its levers so that
its connector part is detached smoothly. When moving levers, do it slowly
without giving much pressure to them.
NOTE: The small levers, which are located above the big ones, are not used for the
purpose of unlocking a basic control unit, therefore do not try to open them
forcibly.
GR4000 Installation Guide Version 1.00 - Preliminary
Lever
181