SW
P/S
W
B
Bo
ar
d
flo
wc
ha
rt
(1
/1)
Po
we
r button
o
n
th
e
main
unit
d
oes
n
ot
w
or
k
Ke
y1
doe
s
no
t o
per
at
e
Doe
s
sy
mp
to
m
imp
ro
ve
w
hen
replacing
th
e
SW
P
board?
N
o
To
IF
co
n se
ct
io
n
flo
wch
art
Is th
er
e
volt
ag
e of
ab
out 3.3V at
pin
2
of
CN402
w
ith
ou
t p
ressin
g
the
ke
ys?
N
o
To
IF
con
s
ec
tio
n
flo
wch
art
Ye
s
Y
es
Th
e pote
ntial
of
pin
2
of
CN33
1
doe
s
no
t
ch
an
ge f
ro
m
3.3V t
o ne
ar
0V
wh
en p
ressing
the
po
we
r bu
tton
N
o
Che
ck
pa
ttern
and
S
331
migh
t be
b
ro
ken
Check t
he resist
anc
e of
resist
ors of
Ke
y1
line.
Also
check
the
su
rrounding
pa
tte
rn.
Ye
s
Di
sconnec
te
d ha
rne
ss
or
repla
ce
SW
P
board
Ke
y o
pera
tion
s
canno
t be
made
on
th
e
Ke
y2
doe
s
no
t o
per
at
e
Doe
s
sy
mp
to
m
imp
ro
ve
w
hen
replacing
th
e
SW
B
board?
N
o
To
IF
co
n se
ct
io
n
flo
wch
art
Is th
er
e
volt
ag
e of
ab
out 3.3V at
pin
4
of
CN402
w
ith
ou
t pres
sing
the
k
ey
s?
N
o
To
IF
con
s
ec
tio
n
flo
wch
art
Ye
s
Y
es
W
hich
ro
w of k
ey
s do n
ot
op
er
ate?
Check t
he resist
anc
e of
resist
ors of
Ke
y2
line.
Also
check
the
su
rrounding
pa
tte
rn
STO
P
bu
tto
ns
->
T
o
Ke
y1
d
oe
s
no
t o
pe
ra
te
Re
ference
: Rela
tion
shi
p o
f B
ut
ton
s and
Vol
tages
O
PE
N
/C
LO
SE
b
ut
to
n
->
T
o
Ke
y2
d
oe
s
no
t o
pe
ra
te
PL
AY
bu
tton
->
T
o
Ke
y3
doe
s
no
t opera
te
Ke
y3
doe
s
no
t o
per
at
e
Is th
er
e
volt
ag
e of
ab
out 3.3V at
pin
3
of
CN402
w
ith
ou
t pre
ss
ing
the
k
ey
s?
N
o
To
IF
con
s
ec
tio
n
flo
wch
art
Y
es
Check t
he resist
anc
e of
resist
ors of
Ke
y3
line.
Also
check
the
su
rrounding
pa
tte
rn
In
pu
t
2.
90-3
.30
0.
00-0
.40
{K
EY0}
Ke
y_
O
FF
PO
W
ER
{K
EY1}
Ke
y_
O
FF
ST
OP
{K
EY2}
Ke
y_
O
FF
O
PEN/CL
O
SE
{K
EY3}
Ke
y_
O
FF
PL
AY
BDP-BX37/S270/S370/S373/S470
9-8
