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Bluetooth troubleshooting
Check
VBAT (pads 52–54)
VIO (pads 18, 32, 49/1.8VDC)
VFLASH1 (pad 6/2,8VDC)
All OK ?
No
Check L132, L133,
C131, C132, R130
and BT module
solders
If all OK –>
lines to BT module
broken
Replace LA4
module
Check V660,
R660, R662,
R663, C664
and
line to
BT module
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Bluetooth
faults
Is BT flashing
OK ?
No
Yes
Check
26MHz SYSCLK
Is it >200mVpp ?
(typ.~600mVpp)
No
Check C133
and D130
(pins 1, 2
1.8 VDC
If OK –>
change D130
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Yes
Phoenix SW
Yes
BT locals.
Run self–tests.
All passed?
Check BT
antenna
connections.
If OK–>
change
antenna
Yes
Check:
is SLEEPX
(pad 48)
1,8 V ?
No
Check for open/short
circuits, is SPCLK
(pad 26) 32 kHz ?
Check CBUS (pads34–36)
and other signals
to BT module.
If all OK –>
replace BT module
Use
No
Change
BT
module
Yes
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