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-
12
S
y
mp
tom
Probable Cau
se
Recommended A
c
tio
n
RUM
BLES,
WHISTLES,
HUM
I
N
SOUND
Rum
ble in soun
d, reg
ar
dle
ss of
form
at.
Audio g
round
ing
schem
e m
ay
need cha
ng
ing
.
Call
serv
ic
e eng
ine
er.
Whis
tl
es in
sound.
Audio g
round
ing
schem
e m
ay
need cha
ng
ing
.
Call
serv
ic
e eng
ine
er.
Hum
(power lin
e f
requ
ency
) in
sound.
Mal
func
ti
oni
ng
exci
ter
lam
p or l
am
p
power sup
ply
.
Stray
l
ig
h
t st
rik
ing
th
e st
er
eo
sol
ar c
el
ls.
Cov
er the s
o
la
r c
el
ls wi
th
a
busin
ess
car
d or
oth
er op
aq
ue
ob
je
ct
.
D
o
NO
T
t
o
uc
h
t
h
e
ce
ll
s a
n
d
do
N
O
T
di
st
ur
b
t
h
e
posi
tion o
f th
e c
el
l brack
et!
•
If
the hum
disappea
rs,
the
p
robl
em
is in
the
exc
ite
r
lam
p.
•
If
hu
m
persis
ts, tur
n
ou
t
al
l lig
hts in the
b
ooth to check
if s
tr
ay
lig
ht i
s s
tr
ik
ing
the
cel
ls. I
f the h
u
m
disappe
ars
,
turn
on boo
th
lig
hts
tha
t a
re
usua
lly
on du
ring
pro
ject
ion,
one
at a
t
im
e, unti
l y
ou det
ec
t hum
ag
ain.
Redir
ect
th
e l
ig
h
t f
rom
the
offe
nding
sou
rce
or k
eep
it
off d
u
ri
ng
a showing
.
If
the hum
stil
l i
s pr
esen
t,
th
e pro
blem
is e
it
h
er
in
the
g
rounding
or wi
ring
or
in
th
e CP650. Ca
ll y
our
se
rv
ic
e
eng
ineer
.
