Trouble Shooting - Hitachi RAM-40QH5 Service Manual

TROUBLE SHOOTING

Model RAM-40QH5
DANGER
1. Remenber that the
0V line is biased to
155-170V 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
Across a – b (0V line) ..................
Across a – ground ...........................
Across b (0V line)– ground ..............
Outdoor unit P.W.B.
– 73 –
Always keep your hands
and metallic things away
from the enclosure of the
oscilloscope.
Oscilloscope
approx 360V
approx 155-170V
approx 155-170V
DANGER!
Don't install
the ground
line.