Mitsubishi SCM80ZA, Manual

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114
Power source 1 Phase 220/230/240V 50Hz
Unit
A
Unit
B
Unit
D
Unit
C
L 1 2 3 1 2 3 1 2 3 1 2 3
Fuse
250V 30A
CT
PCB (POWER)
BK WH
BK WH
RD
PK
BL
Y
R
1
S
1
G
Y
SA
S-A
S-B
S-C
S-D
COM
1
Y/ GN
Y/ GN
N
NF
P
1
N
1
R12
R
4
R
2
RY
1
RY
2
R
3
DS
1
DS
2
Re
CM
C
Y
Y Y
S
2
GR OR
Y
RD
RD
BK
BK
6
1 2
0
4
1
+
RD
BL
+ –
+ –
P N
W
V U
RD
Power transistor
BK
BL WH
P
2
N
2
WH
RD
CNC
CNB
CNN
CNL
CNK
CNM
CND
PCB (POWER TRANSISTOR)
Mark
Color mark
Color
CNN
CNL
CNK
CNM
LED
1
A
LED
4
D
LED
5
ERROR
LED
3
C
LED
2
B
CND
CNS
CNT
CNU
CNV
CNR
51C
CNF
Th
O-R
Th
O-D
Th
O-A
PCB (CONTROL)
EEV
A
FM
O
20S
EEV
B
EEV
C
EEV
D
BK BL GR OR PK
Black Blue Grey Orange Pink
Mark
Color
RD WH Y Y/GN
Red White Yellow Yellow/Green
52
X
5
52
X
5
●
Inspectio
n
of
re
s
istance
valu
e
o
f
discharge
-
pipe
th
e
rmistor
.
Re
mo
ve
th
e
con
ne
cto
r
and
c
hec
k
the
r
esi
st
an
ce
va
lue
.
Se
e
th
e
sec
ti
on
o
f
the
rm
is
to
r
cha
ra
cte
ri
st
ics
o
n
pa
ge
10
9.
●
Inspection of electronic expansion valve
To test if there is voltage. (Voltage
is
only
applied
to
the
electronic
expansion
valve
when
the
valve
angle
is
being changed.) Red to white Red to Orange Brown to yellow Brown to blue If the expansion valve does not operate as shown above, it is defective.
Normal
if
there
is
approximately
DC
5
V
10
seconds
after
the
power
supply
is
turned
on.
}
●
Display
lamp
inspection
• LED 5 (Abnormality display lamp - Red) •
LED
1
to
4:
(Light
display
for
each
room
-
Green)
ON or flashing: Protection function operating) ON
when
there
is
a
serial
signal
being
received
among
each
of
the
indoor
units.
OFF
during
ignition,
stop
(including
no
connection),
abnormality
*
Tester
probe
∞
Normal condition
,
+
(RD)
+
(RD)
~
(OR)
~
(GR)
.
+
(OR)
+
(GR)
–
(BK)
–
(BK)
(When
tester
probes
are
inverted,
the
read
-
ing
should
be
approx.
10~20
Ω
.)
●
Inspection
of
diode
stack
(DS1)
Tester
probe
∞
No
rm
al
co
nd
it
io
n
,
+
(BL)
+
(BL)
.
~
(RD)
~
(RD)
(Wh
en
te
ste
r
pr
obe
s
are
inverted,
the
read
-
ing
shoul
d
be
approx.
10~20
Ω
.)
●
Inspection
of
diode
stack
(DS2)
.
mark
Tester
probe
(BK)
Tester
probe
(RD)
●
Inspection
of
capacitor
Check
the
charging
characteristics
with
a
tester.
(Needle
should
swing
and
return
slowly.
Change
the
polarity
and
check
again.
If
the needle returns, it is normal.)
●
Power
supply
and
serial
signal
inspection
1
to
2
:
AC220/240V
2
to
3
:
Normal
if
the
voltage
oscil
-
lates
between
DC
0
and
approx.
12V
●
Inspe
ction
of
rea
ctor
conduc
ti
vity
R
emove
the
conn
ector
an
d
chec
k
fo
r
conductivi
-
ty. It must be conductive.
●
Inspe
ct
pow
er
trans
istor.
R
emove
the
fa
sten
terminal
and
test
out
-
put voltage.
*
Check
fuse.
There
should
be
conductivity.
Approx.
DC
280
V
(b)
Outdoor
unit
inspection
points
u
*
Check
these
points
with
the
po
wer
supply on.
CAUTION
–
HIGH VOLTAGE
High
voltage
is
produced
in
the
control
box.
Don't
touch
electrical
parts
in
the
control
box
for
5
minutes
after
the
unit is stopped.
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