Pioneer XV-LX61DV Service Manual page 29

5
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Step 2: Check of oscillation
IC401 (Pins 6,7)
8
Does the
oscillation waveform
at 12MHz
?
Yes
IC408 (Pins 2,3)
9
Does the
oscillation waveform
32.768MHz
?
Yes
Check of oscillation is OK
To step 3
Step 3: Check of operation of USB u-COM
TE
L 13942296513
IC401 (Pins 44,45) Main u-COM communication (USBDAI, USBDAO)
10
Do the USBDAO
and USBDA perform
communication with
main u-COM?
Yes
CN401 (Pins 7,8)
11
Can the
waveform shown in
Fig.2 be observed
?
Yes
IC401 is OK.
To step 4.
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* Turn ON the power of product and check the power supply by iPod function.
X401(CF1/CF2)
Is
USBRST3
No No
(Pin 2) high
(3.3V)?
Yes
Check the peripheral circuit of X401.
Replace of X401.
X481(XIN/XOUT)
No
Recheck the power supply
(3.3V) of IC408.
Note : X401 oscillates when the power supply of IC408 is turned ON.
USBDAO and USBDAI should be
No
set to High during the operation.
Replace of IC401 or main u-COM.
D+/D- * Make a confirmation with iPod* connected.
* The iPod that can be used for this product is iPod 5G, iPod nano, iPod classic and iPod touch
(as of April 1, 2008).
Check the power supply voltage of IC401.
No
Check the oscillation of X401.
Check the USBRST.
Replace of IC401.
Note :
When the iPod is connected, the waveform
shown on right side can be observed in
D-/D+.
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2 9
8
Check the Pin 20
(USB XRST) of CN3.
Note : USBRST3 is set to high during the operation.
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3 6 7 1 3 1 5
Fig. 1
IC401
USBDAI Pin 44
IC401
USBDAO Pin 45
Fig. 2
D+
D-
co
.
As it is USB2.0 (FS),
the P-P value is approximately 3 to 3.5V.
XV-LX61DV
7
8
9 4 2 8
0 5 8 2 9 9 4 2 8
IC331 (5 V → 3 V)
Pin 8 Pins 9,10
IC351 (3 V → 5 V)
Pin 9 Pin 11
m
X: 1 μsec/div, Y: 2 V/div
8
9 9
A
B
C
9 9
CN3
Pin 18
D
CN3
Pin 17
E
F
29