20
XV-DV575
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5.2 DVD TROUBLE SHOOTING
No.
Symptoms
Dia
g
nosis Contents
Possible Defective Points
1
The power is not turned on. Are wires of output connector (PO
W
ER SUPPLY Unit) and C
N
96
8
(0
8
D
V
DM Assy) disconnected or damaged ?
Connector / cable
Check that the following voltage is output :
C
N
96
8
-pin 24 or pin 25 (0
8
D
V
DM Assy): 3.3
V
POWER SUPPLY Unit
2
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism does not work.)
Are the signals output from IC201-pin 97 (MDATA) and pin 9
8
(SCLK)
on the 0
8
D
V
DM Assy ? (in the range of 0 - 3
V
)
0
8
DVDM Assy
D
V
D IC (IC201)
Are the signals input into IC5501-pin 50 (MDATA) and pin 51 (SCLK) on
the SYSMAI
N
Assy ? (in the range of 0 - 3
V
)
SYSMAIN Assy
UCOM (IC5501)
Check that the following voltage are output :
Q1302-collector on the SYSMAI
N
Assy: 5
V
POWER SUPPLY Unit /
SYSMAIN Assy
Q1302
Is a resonator (X201: 27 MHz) on the 0
8
D
V
DM Assy oscillating ?
0
8
DVDM Assy
Crystal resonator (X201)
D
V
D IC (IC201)
• Is a signal input into IC203-pin26 (PCE#) on the 0
8
D
V
DM Assy ?
(Is a signal "H" for
8
0 ms and then "L" after the power is turned on ?)
-> Communication with flash ROM.
• Are the signals input into IC202-pin 16 (D
W
E#), pin 19 (DCS#)
and pin 3
8
(SDCLK) on the 0
8
D
V
DM Assy ?
(Is a signal fluctuating ?)
-> Communication with SDRAM
0
8
DVDM Assy
D
V
D IC (IC201)
Flash ROM (IC203)
SDRAM (IC202)
Is a signal output from IC203-pin 2
8
(PRD#) on the 0
8
D
V
DM Assy?
(Is a signal fluctuating for several hundred ms after the power is turned
on ?)
0
8
DVDM Assy
Flash ROM (IC203)
Is a signal input into IC5501-pin 67 (D
V
D ACK) on the SYSMAI
N
Assy ? (Is a signal fluctuating ?)
-> Communication with FL Control IC
0
8
DVDM Assy
D
V
D IC (IC201)
SYSMAIN Assy
UCOM (IC5501)
Is a signal output from IC5501-pin 7
8
(XREADY) on the SYSMAI
N
Assy
? (Is a signal fluctuating in the range of 0-5
V
?)
SYSMAIN Assy
UCOM (IC5501)
Are the signals output from IC5501-pin 49 (SDATA) on the SYSMAI
N
Assy ? (in the range of 0-5
V
)
0
8
DVDM Assy
D
V
D IC (IC201)
SYSMAIN Assy
UCOM (IC5501)
Are the signals of IC204-pin 5 (SDA) and pin 6 (SCL) on the 0
8
D
V
DM
Assy fluctuating for one or two seconds after the power is turned?
0
8
DVDM Assy
EEPROM (IC204)
3
An opening screen is not
displayed on the monitor
(The FL display lights. The
mechanism works.)
Check the video signal path between D
V
D IC (0
8
D
V
DM Assy IC201)
and video-out terminal (see the block diagram)
0
8
DVDM Assy
V
ideo circuit after D
V
D IC
(IC201)
Symptoms that may occur when any of the followin
g
ICs is in failure
IC
Symptoms
EEP ROM
(0
8
D
V
DM Assy : IC204)
User's data cannot be stored in memory.
The ID number is lost.
Flash ROM
(0
8
D
V
DM Assy : IC203)
The power cannot be turned on.
Downloading of the firmware cannot be performed.
DVD IC
(0
8
D
V
DM Assy : IC201)
Any kind of symptoms (no power, a failure in any of the servo, video and audio systems, USB etc.) may be
generated, because the D
V
D processing is performed by a single chip.
64M SDRAM
(0
8
D
V
DM Assy : IC202)
N
o power.
Block noise is generated during playback.