Trouble Shooting; Precautions For Checking - Hitachi RAM-130QH5 Service Manual

TROUBLE SHOOTING

Model RAM-55QH5
RAM-65QH5
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
1 ø 220-240V, 50Hz
(A)
(B)
Across a – b (0V line)....................
Across a – ground..........................
Across b (0V line)– ground............
DANGER !
Don't install
the ground line
– 88 –
Always keep your
outdoor unit 1 P.W.B
hands and metallic
things away the
enclosure of the
scilloscop
outdoor unit 2 P.W.B
approx 360V
approx 155-170V
approx 155-170V