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Bluetooth
Power on
No
Is BLUE_RST signal shape similar
Replace U102
to Fig 1 during powering on Bluetooth?
Yes
No
2V8_VBT at C674=2.8V?
2V8_VBT at C671=2.8V?
Yes
Yes
Check 2V8_VBT
PCB pattern
Bluetooth
Power off
No
Is DEBUB_TX signal shape similar to
Replace U102
Fig.2 during powering on Bluetooth?
Yes
No
Is DEBUB_RX signal shape similar to
Replace M601
Fig.2 during powering on Bluetooth?
Yes
Not available
Is RF Power Level at
Connect BT Headset
Antenna feeding about OdBm?
OK
Replace Headset
Establish a Call
Fig.3
No
Are PCM_SYNC8, PCM_TX, USCC
Replace U102
similar to Fig.3?
Yes
No
Is PCM_RX similar to Fig.3
?
Replace M601
Yes
Re-download
software
5. DOWNLOAD AND CALIBRATION
No
No
BT_EN at
Replace U102
R660=2.8V?
Y
es
Replace (U611)
No
No
Is Soldering of R650, L650
R651, Ant1 good?
Yes
Yes
Replace M601
Figure 3. PCM_SYNCS, Tx, Rx, USC0
- 85 -
BLUE_
RST
Figure 1. Blue_RST
Figur 4 -32 Blue RST
DEBUG
_TX
DEBUG
_RX
Figure EB U
G_Tx, Rx
Figure 2. DEBUG_Tx, Rx
Resolder
PCM_SY
NC8
PCM_TX
PCM_RX
USC0
(Clock)
Figure 4-34 PCM_SYNCS, Tx, Rx,
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