Pioneer SX-LX70SW Service Manual page 43

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QQ
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Step 5: Communication Confirmation
Insert the XM Antenna and check it.
IC501 (Pins 26,28) OSC
Does
crystal oscillate
about 2 to 3 Vp-p?
Yes
IC501 (Pin 11)
Is the
input signal
3.3 V?
Yes
IC501 (Pins 3,5)
Does
I/O signal operate
with 0 V to
3 V?
Yes
IC501 (Pins 18,19) COMM_RX_P/M
Is a
TE
signal unstable at
L 13942296513
200mVp-p level?
Yes
(About 1.2 V center)
to STEP6
Step 6: Sound Confirmation
IC501 (Pin 43)
Is there
a master clock
output?
Yes
IC4001 (Pin 16)
Is there
a master clock input
(24.576 MHz)?
www
Yes
IC501 (Pin 41)
.
Is there
a LR clock
output?
Yes
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No
If there is not abnormality in the path
to the crystal, replace IC501 or X501.
XMRST3
No
Check the path to the microcomputer.
XMDI3, XMDO3
No
Check the path to the microcomputer.
Is a
No
signal of CN501-
No
pins 2 and 3 unstable
at 200mVp-p level?
Yes
Abnormality in XM
Antenna or replace
IC501.
Check the parts and
patterns in the input path.
XMMK
Is there
No
No
abnormality at the
parts and patterns
in the output path?
Replace IC501.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC501.
x ao u163
XMLK
y
i
Is there
No
No
abnormality at the
parts and patterns
in the output path?
Replace IC501.
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IC4001 (Pin 3)
Is there
a LR clock
input?
Yes
IC501 (Pin 37)
Is there
a audio data
output?
Yes
IC4001 (Pin 2)
Is there
a audio data
input?
Yes
IC501 (Pin 39)
Is there
a bit clock
Q Q
output?
3 6 7 1 3 1 5
Yes
IC4001 (Pin 1)
Is there
a bit clock
input?
Yes
IC4001 (Pins 7, 8)
Is an ANALOG
L/R out?
Yes
IC4002 (Pins 1, 7)
Is an ANALOG
L/R out?
Yes
IC4003 (Pins 3, 13)
co
Is an ANALOG
L/R out?
.
Yes
to DSP TROUBLESHOOTING Step 4-2 : When a sound is not
out with the analog signal input
SX-LX70SW
7
8
9 4 2 8
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC501.
XMFD
Is there
No
No
abnormality at the
parts and patterns
in the output path?
Replace IC501.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC501.
XMBK
Is there
No
No
abnormality at the
parts and patterns
0 5 8 2 9 9 4 2 8
in the output path?
Replace IC501.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC501.
DAC L, R
No
Replace IC4001.
LPF OUT
No
Check the parts and patterns
in the path.
Replace IC4002.
TUNER/XM SELECTOR
m
No
Check the parts and patterns
in the path.
Replace IC4003.
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A
B
C
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D
E
F
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