Hitachi RAM-60QH4 Manuel De Service page 132

DANGER
1.
Remember that the
0V line is biased to
162V in reference to
the ground level.
2. Also note that it takes
about 10 minutes
until the voltage fall
after the power switch
is turned off.
DANGER
When using an
oscilloscope, never
ground it. Don't forget
that high voltages as
noted above may
apply to the
oscilloscope.
PRECAUTIONS FOR CHECKING
Power source
1φ 230V, 50Hz
N L
Indoor unit
electric parts
C
Control
D
P.W.B.
Outdoor unit P.W.B.
System power module
◯
b
DC 35V
MAIN P.W.B.
0V
Across a ー b (0V line)..................approx 360V
Across a −ground ........................approx 155-170V
Across b (0V line)−ground............approx 155-170V
Always keep your hands
and metallic things away
from the enclosure of the
oscilloscope.
– 144 –
◯
a
M
Compressor motor
(0V)
DANGER!
Don't install
the ground
line.
Oscilloscope