Hitachi Summit RAC-18YH6, Service Manual, Page: 78 / 96

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Is A
C220-230V being gener
ated at
ter
minals
A
and
B?
Are the connections f
or
ter
minals C and D correct?
Is 5V being gener
ated betw
een
Pin 6 (0V) and Pin
10
(5V) at CN
Is the 15A
fuse nor
mal?
[No oper
ation or abnor
mal oper
ation]
Be sure to tur
n the po
w
er of
f
bef
ore correcting the connection.
mainly
, v
ar
istor (VS2), 3A
fuse
,
smoothing capacitors
, IP
M, etc.
The SW po
w
er supply
s o
vercurrent protection is
activ
ated, disab
ling the microcomputer
.
Correct proper
ly
.
If the 15A
fuse has b
lo
wn,
be a
w
are that other par
ts
ma
y also be def
ectiv
e
.
Replace def
ectiv
e par
ts
.
Is the po
w
er circuit nor
mal?
See the descr
iption on po
w
er
circuit f
or details
.
Is the s
witching po
w
er
circuit OK? Has the 3A
fuse b
lo
wn?
Chec
k to see if C and D cab
les are
connected correctly
.
If re
v
ersed or incompletely inser
ted,
correct the cab
le connection.
Replace an
y def
ectiv
e par
ts
.
If the 3A
fuse has b
lo
wn, the v
ar
istor 2, etc.
ma
y also be def
ectiv
e
.
With the piping and lines (A, B
, C
, D)
connected, oper
ate
the unit in the f
orced cooling
mode using the outdoor unit ser
vice s
witch.
Ho
w did the self-diagnosis
lamp (LD301) b
link?
See the self-diagnosis lamp mode
.
Ye
s
Ye
s
P
o
w
er is OK
Ye
s
Ye
s
Ye
s
No No No No
NG
(Fuse b
lo
wn)
18 (test pin)?
CHECKING OUTDOOR UNIT ELECTRICAL P
AR
TS
RAS_AW_063-082e 11/17/06, 11:54 AM 76