Pioneer SX-LX70SW Service Manual page 43

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