T
ro
u
b
l
eshooting
S
ams
u
ng
El
ectronics
4-69
4-4-
2
5 C
o
mmun
i
c
atio
n E
rror
b
et
w
ee
n MCU
a
n
d
O
u
tdoor
Un
it
t3FGFSFODFCFMPX
t$PNNVOJDBUJPO&SSPSCFUXFFO.$6BOEPVUEPPSVOJU
Indoor Unit Display
Judgment Method
Special Cause
Outdoor Unit Display
1
.
I
nspection
Method
-
Y
es
Y
es
M
CU I
nsta
ll
ation
Qu
antit
y S
et
u
p
S
witch
for
Ou
tdoor
U
nit
P
CB C
ompare
and
check
the
set
v
a
lu
es
and
the
act
u
a
l
M
CU
insta
ll
ation
qu
antit
y
.
Press
the
reset
ke
y (K
3)
of
the
o
u
tdoor
u
nit
P
CB
and
check
the
disp
l
a
y
mod
ul
e
to
check
the
qu
antit
y
of
M
CU
which
responds
to
tracking.
Remo
v
e
the
comm
u
nication
cab
l
e
which
connects
the
o
u
tdoor
u
nit
to
the
M
CU,
and
meas
u
re
the
2
cab
l
es
of
the
o
u
tdoor
u
nit
with
a
scope.
I
s
there
an
y
response
from
the
M
CU
on
the
disp
l
a
y
mod
ul
e
d
u
ring
tracking
?
C
heck
the
comm
u
nication
cab
l
e
which
connects
the
o
u
tdoor
u
nit
to
the
M
CU
.
I
f
there
is
no
pec
ul
iarit
y,
connect
the
M
CU
s
one
b
y
one
to
find
the
M
CU
which
interferes
with
the
comm
u
nication
to
check
and
change
the
M
CU
P
CB
.
I
s
the
v
o
l
tage
between
the
2
cab
l
es
a
s
qu
are
wa
v
e
with
D
C±0
.
7V
or
more
?
A
re
the
qu
antit
y
of
the
act
u
a
lly
insta
ll
ed
M
CU
s
and
the
set
v
a
lu
e
of
the
insta
ll
ation
qu
antit
y
set
u
p
switch
the
same
?
C
orrect
ly
set
the
insta
ll
ation
qu
antit
y
set
u
p
switch
of
the
o
u
tdoor
u
nit
M
CU,
and
press
the
reset
ke
y (K
3)
of
the
o
u
tdoor
u
nit
P
CB
to
re
-
e
x
ec
u
te
tracking.
A
fter
two
min
u
tes
,
find
the
M
CU
which
disp
l
a
y
s
the
comm
u
nication
error
and
check
if
the
P
CB
address
settings
are
o
v
er
l
apped.
(A
comm
u
nication
error
occ
u
rs
if
the
indoor
u
nit
addresses
are
o
v
er
l
apped.)
- I
n
this
case
,
a
comm
u
nication
error
wi
ll
occ
u
r
in
e
v
er
y
M
CU (
2
or
more
u
nits)
with
the
address
incorrect
ly
set.
I
f
there
is
no
pec
ul
iarit
y
in
the
address
,
then
check
the
comm
u
nication
cab
l
e
and
change
the
M
CU
P
CB
.
C
hange
the
comm
u
nication
cab
l
e
and
the
connector
of
the
o
u
tdoor
P
CB,
and
then
change
the
P
CB
.
Y
es
No
No
No
❈
Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.4-80
