Hitachi ZAXIS 120-6 class Operator's Manual page 184

Electrical Control Main Switch
By placing the pilot control shut-off lever in the lock release
position, and pressing electrical control main switch (6),
indicator (7) lights, allowing use of the electrical control
(attachment switch). Pressing electrical control main switch (6)
one more time, turns indicator (7) to the OFF position.
Also by turning the key switch to the OFF position changes the
indicator OFF.
d
CAUTION: When there is no need to use the electrical
control (attachment switch) system, turn OFF electrical
control main switch (6) to avoid incorrect operation.
OPERATOR'S STATION
1-102
6
7
MDAA-01-311