Pioneer VSX-1018AH-K Service Manual page 58

1
A
Step 2: Check of oscillation
IC801 (Pins 6,7)
9 X801(CF1/CF2)
Does the
No
oscillation waveform
at 12MHz
?
Yes
Check the peripheral circuit of X801.
B
Replace of X801.
IC808 (Pins 2,3)
10 X881(XIN/XOUT)
Does the
No
oscillation waveform
32.768MHz
?
Yes
Check of oscillation is OK
C
To step 3
Step 3: Check of operation of USB u-COM
IC801 (Pins 44,45) Main u-COM communication (USBDAI, USBDAO)
11
Do the USBDAO
No
and USBDA perform
communication with
main u-COM?
D Yes
CN801 (Pins 7,8)
12 D+/D-
Can the
No
waveform shown in
E
Fig be observed
?
Yes
IC801 is OK.
To step 4.
F
58
1
2
* Turn ON the power of product and check the power supply by USB iPod function.
Is
USBRST3 No
Check the Pin 8 (USB XRST)
(Pin 2) high
of CN701 (CN702).
(3.3V)?
Note : USBRST3 is set to high during the operation.
Yes
Recheck the power supply
(3.3V) of IC808.
Note : X801 oscillates when the power supply of IC808 is turned ON.
USBDAO and USBDAI should be
set to High during the operation.
Replace of IC801 or main u-COM.
* Make a confirmation with USB memory or 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 IC801.
Check the oscillation of X801.
Check the USBRST.
Replace of IC801.
Note :
When the usable USB memory or iPod is
connected, the waveform shown on right
side can be observed in D-/D+.
2
3
Fig. 1
IC801
USBDAI Pin 44
IC801
USBDAO Pin 45
Fig.
D+
D-
As it is USB2.0 (FS),
the P-P value is approximately 3 to 3.5V.
VSX-LX51
3
4
CN701
IC701 (5 V → 3 V)
(CN702)
Pin 11 Pins 12,13 Pin 6
CN701
IC702 (3 V → 5 V)
(CN702)
Pin 2 Pin 18 Pin 5
X: 1 μsec/div, Y: 2 V/div
4