Xm Troubleshooting - Pioneer SX-LX70SW Service Manual

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5.3 XM TROUBLESHOOTING

QQ
3 7 63 1515 0
A
Troubleshooting
• This flow is the diagnosis method when there is no reception or no sound output.
• It is assumed that there is no loose connection or damage in the LCRs.
• Refer to Block Diagram beside the Schematic Diagram about the signal flow.
Step 1: Preliminary connecting confirmation
Confirm the following items before checking
Is XM ANTENNA
B
is surely connected
to XM JACK
?
Yes
To Step 2
Step 2: Power
DC-DC CONVERTER
IC502 (Pin 1)
No
Is the voltage
C
around 12.0V?
Yes
L502 C507 side
TE
L 13942296513
No
Is the voltage
over 5.0V?
Yes
D IC501 (Pins 4, 8, other)
No
Is the voltage
around 3.3V?
Yes
IC4001 (Pin 5) 3.3V INPUT
(Pin 6) 5.0V INPUT
Is the voltage
No
around each
E
3.3V or 5.0V?
Yes
IC4003 (Pin 16) TUNER/XM SELECTOR
No
Is the voltage
www
around 12.0V?
Yes
To Step 4
F
42
1
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2
No
Tighten the connection.
Check the parts and patterns
in the path.
Replace IC502 or XM ANTENNA.
Check CN501.
To STEP3
XM DT
Check the parts and patterns
in the path.
DAC
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
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y
. i
2
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8
Step 3: Abnormal in external Power Supply
"XM POWER ERR" is displayed on FL display or no display, etc.
IC5201 (Pin 54)
Is the voltage
around 3.3V?
Yes
IC5201 (Pin 55)
Is the voltage
around 3.3V?
Yes
To Step 4
Q Q
3 6 7
Step 4: Reception Confirmation
Switch to Antenna Aiming mode at XM menu.
Signal strength indicator
Is the indication
OK?
Yes
To Step 6
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SX-LX70SW
3
4
2 9 9 4
DIGITAL RADIO U-COM
No
Check the communication and power
line of IC5201
DIGITAL RADIO U-COM
No
Check the parts and patterns
in the path.
Or the XM ANTENNA may be
defective .
1 3 1 5 0 5 8 2 9
DISPLAY
Does the reception becomes
No
OK by relocating the antenna
near a window?
No
To Step 5
m
co
.
4
2 8
9 9
9 4 2 8 9 9
Yes