Dolb
y
®
Mod
el CP6
50
T
rou
bles
h
o
ot
ing Char
t
Mai
n
ten
anc
e
and
T
roubles
hoot
ing
9-
9
S
y
mp
tom
Probable Cau
se
Recommended A
c
tio
n
NO
SOUND A
T
A
L
L
No sound
, f
ron
t-
panel da
rk
, power
butt
on no
t g
lowing
.
No power
to e
ith
er m
ain o
r
by
pass sy
stem
s.
See i
f AC m
ains pan
el
ci
rc
uit b
re
ak
er fe
edi
ng
the CP6
50 is
tr
ipp
ed.
Ve
ri
fy
that
al
l pow
er
co
nne
ctor
s a
re
ful
ly
inse
rt
ed i
n
to
the
ir s
o
ck
ets.
Press
m
ain power b
u
tt
on. I
f CP650 st
il
l do
es no
t c
o
m
e on, che
ck
fuse
behind
pl
ast
ic door in
AC m
ains
power inl
et
m
odule l
o
cat
ed
on the
rea
r
of the uni
t.
No sound
, and
swi
tch
ing
to
By
pass
doesn
’t res
tor
e
so
und.
OR
No sound
, f
ron
t-
panel da
rk
, power
butt
on i
s i
llum
ina
ted,
and s
y
stem
is
alr
eady
in B
y
pass.
D
efec
tiv
e an
alog
re
ade
r LE
D
, exci
te
r l
am
p, or
LED/lam
p power s
upply
.
Pro
je
cto
r s
el
ect
ion w
ire
/sw
itch
is f
aul
ty
.
N
o
sig
nals
com
ing
from
ste
reo s
o
la
r c
el
ls.
Pow
er
am
pli
fie
rs sw
it
ched off.
Check
that
th
e LED or e
x
ci
ter
lam
p is on
. I
f not, fa
de u
p
back
g
round
m
u
sic, tra
nsf
er
the
ree
l
to t
h
e al
te
rna
tiv
e pr
o
je
cto
r an
d
cont
inue
th
e
show unt
il
th
e LED/l
am
p or i
ts powe
r su
pply
can
be r
eplac
ed. Ca
ll
se
rv
ic
e e
n
gi
n
eer
.
If
the fron
t-
panel i
ndi
cat
ion
(
P1, P2
) fo
r th
e cu
rr
ent
ly
activ
e p
ro
ject
or
is no
t co
rr
ect
, che
ck
the p
ro
jec
tor
se
lec
tor
sw
it
ch w
iri
n
g
.
In
additio
n,
check
tha
t t
h
e sw
it
ch or
re
la
y
is ope
rat
ing
prop
er
ly
.
C
h
eck
that
th
e
si
gnal
-pre
se
nce
LEDs i
n
si
de
the s
etu
p
panel
acc
ess
door a
re
fl
ash
ing
while
fi
lm
is r
unn
ing
.
If
not,
the
re i
s n
o
sig
nal
from
the s
o
la
r c
el
ls, o
r t
h
e Ca
t. N
o. 772 an
alog
boa
rd ha
s f
ai
le
d. Subs
ti
tu
te a
k
nown, work
ing
Cat. No. 772 boa
rd.
Check
power f
eed
to powe
r am
plifi
ers
fo
r bl
own ci
rcu
it
br
eak
er o
r
fuse
or a
cc
iden
ta
l di
sconn
ec
ti
on.
No sound
, f
ron
t-
panel nor
m
al.
Check
the c
ause
s l
is
ted
abo
v
e, plus wrong
fo
rm
at
sele
ct
ed, sy
st
em
m
u
ted, or
fa
der
tu
rned d
o
wn.
Check
sam
e com
ponents as
m
entioned
abov
e. Then v
erify
se
le
cte
d
form
at, m
u
te st
atu
s, an
d fa
d
er se
tting
. I
f no form
ats p
ro
duce s
ound,
ther
e m
ay
be a CP650 in
te
rn
al p
rob
lem
. Call y
our
loca
l se
rv
ice
eng
ineer
.
