34
SC-27
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCHART
[1] DSP Troubleshootin
g
(1) Simplified dia
g
nosis
Errors in the DSP Block of the DSP Assy (those simply and ro
u
ghly predicta
b
le
b
y machine operation only)
• Has DSP
b
lock ca
u
sed the malf
u
nction?
Inp
u
tting a 2 ch PCM (s
u
ch as CD) digital signal, check if the so
u
nd plays
b
y s
w
itching AUTO SURR / STREAM DIRECT.
When the so
u
nd doesn’t play in AUTO SURROUND or DIRECT MODE tho
u
gh it does in PURE DIRECT (PCM DIRECT)
MODE, DSP
b
lock might
b
e defecti
v
e.
(2) Troubleshootin
g
• Ass
u
me that the LCRs are neither in poor connection nor damaged.
• This sho
w
s fail
u
re analysis for the DSP Block of the DSP Assy.
Step 2: Power supply
Step 1: Connections
CN2001,CN2002,CN2003,
CN2602,CN2901,CN2902
Are the
connectors sec
u
rely
inserted?
Insert the connectors
sec
u
rely.
No
CN2003 (Pins 1-3)
IC2307 (Pin 2)
Is the
v
oltage
6 V?
No
6V inp
u
t
Connection
w
ith
the INTERFACE Assy.
1st, 2nd Block 3.3V
CN2601
Connection
w
ith
the DIGITAL MAIN Assy.
No
Replace CN2003.
Check the o
u
tp
u
t from the
REG Assy.
Yes
Replace IC2307.
Yes
Is there
any poor connection
at Pins 1-3 of
CN2003?
Is the
v
oltage
4.2 V-4.5 V
?
No
No
The o
u
tp
u
t and GND may
b
e short-
circ
u
ited. Check the path
b
et
w
een
them.
Yes
Yes
Is IC2307
a
b
normally hot?
A
Yes
Is the
FFC sec
u
rely
inserted?
Insert the FFC
sec
u
rely.
No
CN2201
Connection
w
ith
the DIGITAL_BRIDGE Assy.
Yes
Is the
connector sec
u
rely
inserted?
Insert the connector
sec
u
rely.
No
Yes
To Step 2
A
• The parts marked like in the follo
w
ing chart are located in "Check Points of the DSP Assy."
A
B
IC2301 (Pin 72, etc.) 1st DSP 3.3V
Is the
v
oltage
3.3 V?
No
Yes
C
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
IC2307 (Pin 4)
Is the
v
oltage
3.3 V?
No
Yes
IC2304 (Pin 20)
LATCH 1
Is the
v
oltage
3.3 V?
No
Yes
D
E
