Read Sony HCD-GPX3G (serv.man2) Service Manual online
HCD-GPX3G
2
SECTION 1
SERVICING NOTES
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
(1) A
C
in
pu
t
(2) Fu
se
(3) S
ub P
ow
er t
ran
sf
orm
er
(4
) CN 3
Co
nn
ec
to
r
pi
n1
:13.5V
, pi
n2
:GN
D
, pi
n3
: A
C
D
ET
, pi
n4
: MA
IN
ON
pi
n5
: SU
B
O
N
(5) MA
IN
P
ow
er tran
sf
orm
er
(6
) CN 2
Co
nn
ecte
r
pi
n1-3: P
VD
D
(D
C
+54.5V
)
pi
n4
: P
VDD
(DC+
22
V)
pi
n5
: G
ND
pi
n6
: P
VDD
(DC-
22
V)
pi
n7
-9
: P
VDD
(DC-
54
.5
V)
AC
IN
Th
e P
ow
er
C
on
trol
s
ign
al
to S
w
itc
hi
ng r
egu
lat
or
is
c
hec
ked.
Is
fol
low
in
g
pow
er
v
ol
tage
O
K?
Ch
ecks
wh
et
he
r th
e
sta
te
o
f a
Ca
bl
e
an
d
O
ut
let
ar
e
nor
m
al
. I
f t
her
e ar
e n
o
pr
obl
em
s,
ch
ecks cir
cu
m
fe
re
nce
cir
cu
it
fo
r M
ain
on
/S
ub on
O
ut
pu
t of
M
ai
n m
ou
nt
s
ide .
Ye
s
No
Th
e
O
ut
pu
t f
ro
m
S
w
itch
in
g
re
gu
la
to
r
is ch
ecke
d.
Is
fol
low
in
g pow
er
v
ol
tage
up t
o
st
an
dar
d?
S
tan
dby
D
em
o
m
ode
C
N
3 1p
in
:
C
N
2 1p
in
:
Re
pl
ac
es
S
wit
ch
in
g
re
gu
la
to
r
if
it is n
ot
up t
o
st
an
dar
d.
No
Ye
s
EN
D
13.5V ± 0.5V
13.5V ± 0.5V
7.5V ± 0.5V
54.5V
±
0.5V
Po
w
er
O
n
Main on/Sub on Standby
Demo mode Power On
CN 3 :4pin: Low (0V) Low (0V)
Hi (3V)
CN 3 :5pin
Low (0V) Hi (3V) Hi (3V)
( 1
)
(2
)
(
3)
(4
)
( 5
)
(
6
)
0V
0V
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