Table of Contents
Advertisement
4. TROUBLE SHOOTING
Bluetooth
Power on
Is BLUE_RST signal shape similar
to Fig.1 during powering on Bluetooth?
Yes
No
2V8_VBT at C663=2.8V?
Yes
Bluetooth
Power off
Is DEBUB_TX signal shape similar to
Fig.2 during powering on Bluetooth?
Yes
Is DEBUB_RX signal shape similar to
Fig.2 during powering on Bluetooth?
Yes
Not available
Connect BT Headset
OK
Establish a Call
No
Are PCM_SYNC8, PCM_TX, USCC
similar to Fig.3?
Yes
No
Is PCM_RX similar to Fig.3
Fig.3?
Yes
Re-download
software
No
Replace U100
No
BT_EN at
2V8_VBT at C663=2.8V?
R660=2.8V?
Yes
Yes
Check 2V8_VBT
Replace (U603)
PCB pattern
No
Replace U100
No
Replace M1
No
Is RF Power Level at
Antenna feeding about OdBm?
Yes
Replace Headset
Replace U100
Replace M1
No
Replace U100
Figure 4-32 Blue_RST
Figure 4-32 Blue_RST
Figure 4-33 DEBUG_Tx, Rx
Figure 4-33 DEBUG_Tx, Rx
No
Is Soldering of R643, L601
Resolder
R666, Ant1 good?
Yes
Replace M1
Figure 4-34 PCM_SYNCS, Tx, Rx, USC0
Figure 4-34 PCM_SYNCS, Tx, Rx, USC0
- 68 -
BLUE_
RST
DEBUG
_TX
DEBUG
_RX
PCM_SY
NC8
PCM_TX
PCM_RX
USC0
(Clock)
Advertisement
Table of Contents
