FR
Bo
ar
d f
low
ch
ar
t (
1/2
)
FL
D
do
es
no
t li
gh
t
Is
there
vo
ltage
of
ab
ou
t 5
.8V
at
PS
70
1?
No
To
F
LD
S
wi
tch
S
ur
ro
un
din
g C
he
ck
Ye
s
Is
there
vo
ltage
of
ab
ou
t -
22
V
at
JL
70
1?
No
Check
th
e c
ircu
its
surro
un
ging
the
FL
D
DD
CO
NV
ER
TE
R.
Ye
s
Is
there
vo
ltage
of
3.
3V
at
P
in43
of
IC
702?
No
Ch
eck
th
e 3.3
V
lin
e of
th
e F
R
bo
ard.
Ye
s
Is
pin5
of
IC
70
2 osc
illat
ing?
No
Rep
lac
e I
C702.
If
no
ef
fect
, re
plac
e t
he
F
R
board.
Ye
s
Is
the
re
in
put
of
pu
lse
to
pi
ns
7,
8
and
9
of
IC
70
2?
No
Re
pla
ce
FF
C
be
tw
ee
n F
R
an
d M
B.
If
no
eff
ect
, th
en
go
to
IF
D
flow
Ye
s
Check
co
nn
ec
tion
of
FL
D
an
d I
C702.
Re
plac
e I
C702
if
OK
.
If no
de
fect
, rep
lac
e t
he
FR
bo
ard
FL
D
Sw
itch
Surro
un
din
g C
he
ck
Is
the
po
ten
tia
l of
th
e b
ase
of
Q
704
aro
und
5V
?
Ye
s
Is
the
co
llector
vo
ltage
of
Q
70
3 abou
t 0
V?
No
Is
the
vo
ltage
of
th
e base
of
Q
70
3 at
3.3
V?
No
Is
pin
7 of
CN
70
2
at
3.3
V?
No
Re
pla
ce
FF
C
an
d C
he
ck
pa
tte
rn
near
IC
15
03
of
MB
bo
ard.
Re
place
IC
15
03
or
MB
board
if
Y
es
Y
es
Re
pla
ce
Q
70
3
Re
pla
ce
th
e F
R
bo
ar
d
BDP-BX37/S270/S370/S373/S470
9-9
Re
pla
ce
Q
70
4
Re
pla
ce
Q
70
4
Y
es
No
