Pioneer DV-490V-S Service Manual page 61

5
No. Symptoms
QQ
3 7 63 1515 0
4 A tray cannot be opened.
(An opening screen is
displayed on the monitor)
5 Playback impossible
(no focusing)
6 Playback impossible
(Spindle does not turn)
TE
L 13942296513
7 Playback impossible
(Playback stops)
8 Picture disturbance during
playback
(block noise, freeze, other)
9 No sound
(Picture is normal)
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Does the voltage of CP2302-pin 3 and pin 1 on the DVD MT Assy
change normally ?
Pin 5 (SW2(TRIN)): Tray is fully closed: "L"
Pin 3 (SW1(TROUT)): Tray is fully opened: "L"
Is a LOAD-DRV signal reaching ?
Are the signals output from IC2301-pin 5 and pin 6 (CP2302-pin 4 and
pin 5) on the DVDMT Assy ?
Pin 5: Approx. 4.5 V during opening tray approx. 0V during closing tray.
Pin 4: Approx. 0V during opening tray approx. 4.5 V during closing tray.
Are wires of CP2302 and CP2303 on the DVDMT Assy disconnected
or damaged ?
Does the voltage of CP2303-pin 5 change by pressing the Inside
switch.
Are the signals output from IC2301-pin 9 (F+) and pin 8 (F–) on the
DVDMT Assy ?
Does 650-nm LD emit light ?
Does a pickup lens move up / down ?
Does an actuator spring bend ?
Are plastic parts damaged ? Or is a shaft detached ?
Is the turntable detached or tilted ?
Is flexible cable of CP2301 on the DVD MT Assy disconnected or
damaged ?
Is signal output from IC4001-pin 42 (FOSO) on the DVDMT Assy ?
(Device control of about 1.4 V is output usually. It is fluctuated by about
± 250 mV with focus up / down.)
Are the signals output from IC2301-pin 13 (MOT SPDL–), and pin 14
(MOT SPDL+) on the DVD MT Assy ?
Is pin 41, 42 (STBY) fixed LOW?
Is there any part detached from the spindle motor ?
Or Is there any foreign object lodged in it ?
Are wires of CP2303 on the DVD MT Assy disconnected or damaged ? Flexible cable / connector
Is signal output from IC4002-pin 37 (DMSO) on the DVDMT Assy ?
Does 650-nm LD deteriorate ?
If the voltage at each both ends of R2321 and R2323 on the DVD MT
Assy is 0.4 V or more, the 650-nm LD is definitely deteriorated.
Does 780-nm LD deteriorate ?
If the voltage at each both ends of R2320 and R2322 on the DVD MT
Assy is 0.4 V or more, the 780-nm LD is definitely deteriorated.
Are there scratches or dirt on the disc ?
Are there scratches or dirt on the disc ?
Is there a problem with the format of the disc ?
Is signal output from IC4001-pin184 and pin 186 on the DVD MT Assy
?
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Diagnosis Contents
2 9
8
Q Q
3 6 7 1 3 1 5
co
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DV-490V-S
7
8
Possible Defective Points
9 4 2 8
Tray SW
DVD MT PCB Assy
DVD IC (IC4001)
DVD MT PCB Assy
FTS Driver IC (IC2301)
Connector / cable
Inside switch
DVD MT PCB Assy
FTS Driver IC (IC2301)
Pickup
Mechanism section (motor)
Flexible cable / connector
DVD MT PCB Assy
DVD IC (IC4001)
DVD MT PCB Assy
FTS Driver IC (IC2301)
Mechanism section
(Spindle motor)
DVD MT PCB Assy
0 5 8 2 9 9 4 2 8
DVD IC (IC4001)
650-nm LD deteriorated.
(When playback of a DVD is
impossible)
780-nm LD deteriorated.
(When playback of a CD is
impossible)
Disc
Disc
DVD MT PCB Assy
DVD IC (IC4001)
m
9 9
A
B
C
9 9
D
E
F
61
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