3-4 V
erify power functionality
Ve
rify
po
we
r
fu
nc
tio
na
lit
y.
Is
th
e
st
at
us
L
E
D
stea
dy
lig
ht
red
Replace
the
m
ai
n
bo
ar
d
Y
es
E
ns
ur
e
al
l c
on
ne
ct
or
s
ar
e
co
nn
ec
te
d
pr
op
re
ly
C
he
ck
L
E
D
S
TA
TU
S
E
ns
ur
e
th
at
th
e
ai
rfl
ow
ve
nt
s
ar
e
no
t b
lo
ck
ed
and
tha
t the
op
erating
te
m
pe
ra
tu
re
is
le
ss
th
an
4
0o
C
Is
p
ro
bl
em
so
lv
ed
?
R
ep
la
ce
th
e
th
er
m
al
s
w
itc
h
Is
problem solved?
N
o
N
o
Con
tin
ue
function
te
st
Is
th
e
st
at
us
L
E
D
fla
sh
in
g
re
d
N
o
M
easure
voltag
e
of
J29
-
J3
8
pi
n1
=4
.5
~1
2V
±0
.3
V
?
Y
es
N
o
Rep
lace
th
e
main
bo
ard
Y
es
M
ea
su
re
v
ol
ta
ge
o
f J
29
-
J3
8
pi
n2
=3
.3
V
?
R
ep
la
ce
th
e
corre
sp
ond
ing
fan
or
b
lo
w
er
N
o
Is
th
e
Li
gh
t L
E
D
o
ff
an
d
st
at
us
L
E
D
flashing
g
ree
n
N
o
M
ea
su
re
v
ol
ta
ge
J4
8
P
in
1=
5V
?
Y
es
M
easure
vo
lta
geJ25
P
in
1=
5V
?
Y
es
Re
place
LD
dr
iver
board
N
o
R
ep
la
ce
p
ho
to
se
ns
or
N
o
Y
es
Re
place
the
main
b
oard
N
o
EK-815U
3-4
