Hitachi RAS-E10H2 - POWER CIRCUIT DISCHARGE AND SHUT OFF PROCEDURE

TROUBLE SHOOTING
PRECAUTIONS FOR CHECKING
MODEL RAC-E10H2
WARNING
WARNING
Always keep your hands
and metallic things away
from the cabinet.
DANGER!
Don't install
the ground
line.
When using an
oscilloscope, never
ground it.
Don't forget that high
voltage as noted in
the figure above may
apply to the
oscilloscope.
Remember that
voltage of 175 V is
applied to the 0V line
on the P.W.B. or the
like as shown in the
right diagram.
Indoor
Controller
O
utdoor
C
ontro
ller
Po
w
er
S
w
itc
h
Point
400
F
I.P.M
Co
m
pressor
motor
P
oint
line
Control
P.
W
.B
.
Main P.W.B.
V
oltage at point
A
G
round voltage
Grounding
350V
P
oint
B (0V
line)
Power
inlet
WARNING
Do not use a soldering iron with
transformer: Otherwise, thermal fuse
inside transformer will be blown.
Caution
• V
oltage of about 350
• Voltage of about 350 • V
V is charged between the ter
minal of smoothing capacitors (375µF x 2).
•
Dur
ing
continuity
chec
k
f
or
each
circuit
par
t
of
the
outdoor
unit,
be
sure
to
discharge
the
smoothing
capacitors
.
Disc
ha
rg
e Pr
ocedur
e
1.
Tu
rn
off the po
w
er of the indoor unit or pull out the po
wer supply plug.
2.
After po
wer
is tur
ned off
, wait f
or 10 minutes or more
.
Then, remo
ve
electrical par
ts co
ve
r
and
apply
solder
ing
iron
of
30
to
75
W
f
or
15
seconds
or
more
to
T
AB05 and R001
TAB05 and R001T
terminals on the main
P.
W.
P.W.P.
B.
as shown in the figure belo
w,
in order to dischargevoltage in
smoothing capacitor.
DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT
LEAD WIRE
SOLDERING IRON (30 TO 75W)
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