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Checking Flow
Is BT_RST signal shape similar
to Fig.1 during Powering
on Bluetooth
Yes
2V8_VBT at C300=2.8V
Bluetooth
Power off
Is DEBUG_TX signal similar to
Fig.2 during Powering on
Bluetooth?
Is DEBUG_RX signal similar to
Fig.2 during Powering on
Bluetooth?
Connect BT headset?
Establish a call
Are PCM_SYC8,PCM_TX,USC3
signal similar to Fig.14-8(c) ?
Is DEBUG_RX signal similar to
Fig.4-10(b) during Powering on
Bluetooth?
Redownlapd SW
No
Replace U101
No
BT_EN at R311=2.8V
Yes
Replace U300
No
Replace U101
No
Replace M300
Is RF Power level at
No
Antenna Feeding about
0dBm?
Replace Headset
No
Replace U101
No
Replace M401
Figure 4-24.
- 87 -
4. TROUBLE SHOOTING
No
Replace U101
No
Is RF Power level at
Antenna Feeding about 0dBm?
Replace M300
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