Hitachi RAF-35NH5 Service Manual page 290

ROUBLE SHOO ING
MODEL RAM-80QH5
DANGER
1.
Remem er that the
0V line is iased to
190V in reference to
the ground level.
2.
Also note that it takes
a out 10 minutes
until the voltages fall
after the power switch
is turned off.
DANGER
When using an oscillo-
scope, never ground it.
Don't forget that high
voltages as noted
a ove may apply to
the oscilloscope.
PRECAUTIONS FOR CHECKING
Power source
1 V, 50Hz
φ, 230
~
C1
Indoor
D1
unit1
C2
Indoor
D2
unit2
C3
Indoor
D3
unit3
C4
Indoor
D4
unit4
Outdoor unit P.W.B.
~
⃝
MAIN P.W.B.
Across a
ー
Across (0V line)
Always keep your hands
and metallic things away
from the enclosure of the
oscilloscope.
- 320 -
a
⃝
M
Compressor motor
(0V)
(0V line) approx 380V
..................
approx 190V
−ground............
DANGER!
Don't install
the ground
line.
Oscilloscope