22
BDP-320
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5. DIAGNOSIS
5.1 POWER ON SEQUENCE
Pressing of the POWER key is detected
b
y the IC4001 S
ub
microcomp
u
ter on the MAI
N
Assy.
The IC4001 then o
u
tp
u
ts a POWER_O
N
signal to the POWER SUPPLY U
N
IT.
After recei
v
ing the POWER_O
N
signal, the POWER SUPPLY U
N
IT acti
v
ates, secondary
Po
w
er[SW+12
V
], setting it to O
N
.
Comm
u
nication
b
et
w
een the R
8
A34019BG and the DDR2 SDRAM starts.
Comm
u
nication
b
et
w
een the R
8
A34019BG and the FLASH_IC starts.
It takes a
b
o
u
t 1 min
u
te to complete the start
u
p process.
The R
8
A34019BG (IC1001), the core LSI, starts
u
p. {RS-232C connector C
N
1601,
log it to O
N
}
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