Pioneer XW-NAC3-K Service Manual page 21

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QQ
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Step 5 : USB Signal Check
CN801 (Pins 2,3)
Are there
the waveforms
like figure?
Yes
USB operation of IC701 is OK.
fig. : D+
TE
L 13942296513
fig. : D-
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D+/D-
D+ and D- should have waveform
No
during normal condition.
Check the pattern in the path.
X : 1 usec/div, Y : 2 V/div
X : 1 usec/div, Y : 2 V/div
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Step 6 : Operation of PHY IC
Note: Connect this unit to the router with an LAN cable,
and check it.
IC861 (Pins 8, 32)
Is the
voltage 1.8 V?
Yes
IC861 (Pins 46, 47)
Does
the crystal
oscillate at
25.000 MHz?
Yes
D861, D862
Does
LED start lighting
and blinking when
turning the power
on?
Yes
IC861 is normal.
Q Q
3 6 7 1 3 1 5
Meaning of each LED
D861 Yellow
D862 Green
Step 7 : Audio (I
Note: Check it in the state that played some contents.
CN901 (Pins 5, 7, 9, 11)
Is there
2
the I S digital
audio signal?
No
IC701 (Pins 195,168,167,21)
Is there
2
the I S digital
audio signal?
No
Check the IC701 (DM850E)
co
operation.
.
XW-NAC3-K
7
9 4 2 8
PHY IC
No
Check the power (pin 48) of IC861
and check the path and circuit
between pin 32 and pin 8.
XIN/XOUT
No
Check the voltage of IC861 again.
Link LED/ACT LED
No Check the path between JA701
and IC861.
Check the MII interface between
IC861 and IC701.
Replace the IC861.
0 5 8 2 9 9 4 2 8
LINK Light when links it.
ACT Blink when it transmits and receives data.
2
S) Output
BCLK, MCLK, LRCK, DATA output
Yes
Check the DAC part of the
MAIN PCB Assy.
Yes
Check the parts and patterns in
the path between IC701 and CN901.
m
8
9 9
A
B
C
9 9
D
E
F
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