Read Sony HBD-E385 / HBD-E390 / HBD-T39 (serv.man2) Service Manual online
HBD-E385/E390/T39
2
SECTION 1
SERVICING NOTES
TROUBLESHOOTING
Power Check Flow (1/2)
Check that the output voltages of the switching regulator
(SWR1) are the following value.
CN301 pin 1: 12 V (A+12V)
CN301 pin 2: 12 V (UNSW12V)
CN301 pin 3: 12 V (FEUNSW12V)
CN301 pin 8: 6 V (UNSW6V)
CN301 pin 9 : 6V (FL_6V)
Check that the following fuses are not damaged.
F5301/F5303/F5304/F5305/F5306/F5307
Ye
s
Ye
s
C
heck each voltage
w
ith
re
fe
re
nce to
the
sc
hemati
c
diagrams,
and check
that ther
e is
no
pr
oblem
in them.
Check the
related IC
on
the
MB148
board.
Ye
s
C
heck
the
fo
llow
ing
pow
er
contr
ol
si
gnal
in the power on state.
(N
ormally voltage:
+3.3
V)
MB148 board
IC6301
pin
36
to
38
(PCON
T1 to
PCON
T3)
Pin 25
(PCON
T_
FL)
Pin 47
(PVDD_
CON
T)
Ye
s
The power is turned on.
A
No
Yes
Pr
otect
mode happened “PROTECT”
dis
play appear
s
on
fluor
es
cent
tube.
No
Ye
s
C
heck
that har
nes
s is
ins
er
ted nor
mally
at
CN101
Remove harness
of
CN
101, CN
4,
FFC
CN
3503.
Measure
switchi
ng
supply board CN
101 pin4
<->
pin1,
(normal voltage
>
30V)
Ye
s
Ye
s
AMP boar
d
damage.
Exchange the
complete AMP
board.
Check
that harness is
inse
rted normally at
CN
301
and
C
N
5301. When
har
nes
s
is ins
er
ted nor
m
ally, exchange
the
switching regulator (SWR1).
No
Exchange the
damaged f
us
e.
Exchange the
complete
MB148 board, when the power is not turned on,
even if
you
exchange f
us
es
.
No
Pow
er
s
upply IC
is
damaged. Exchange
the
pow
er
s
upply IC.
No
Exchange the
IC
6301.
Part No. A-1857-997-A
Description IC
R5F3650
KC
DF
B
(for
SE
RVICE
)
No
No
Ins
er
t nor
mally the har
nes
s and
pow
er
O
N
again.
No
Sw
itching s
upply
boar
d
damage. Exchange the
complete
sw
itching s
upply
boar
d.
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