1-64 (No.RA075<Rev.001>)
5.3
Failure diagnosis of the Bluetooth section
Overview:
When the Bluetooth function does not operate, use this flowchart to determine the problem.
Major parts for a Bluetooth circuit
Bluetooth antenna (Pattern Antenna)
LC filter (L11)
BT/GPS IC (IC5)
Level conversion IC (IC6, IC7)
TCXO 19.2MHz (X1)
32.768kHz clock (X2)
33BT Regulator (IC3)
18BT Regulator (IC2)
MPU/DSP IC (IC706)
IC706
IC6
IC5
UART
UART
UART
L11
IC7
Pattern Antenna
PCM
PCM
PCM
MAIN UNIT
X1
X2
MODULE (BT/GPS)
UNIT
MPU/DSP
IC
BT/GPS
IC
TCXO
19.2MHz
32.768kHz
Clock
LC
Filter
Bluetooth
Antenna
Level
conversion
IC
Level
conversion
IC
It is not possible to have pairing the Bluetooth (BT) headset.
Fail
Fail
Fail
Fail
Fail
Fail
No
Replace any abnormal parts.
Verify the BT/GPS power supply.
(33BT) L4: 3.3V
Check the Module (BT/GPS) unit PCB side A.
Check the Module (BT/GPS) unit PCB side A.
Verify the ANT Matching Parts.
Visual check of L15, C68.
(Whether not damaged)
Check the Module (BT/GPS)
unit PCB side B (a).
Verify the BT/GPS power supply.
(18BT) L15: 1.8V
Check the Module (BT/GPS) unit
PCB side B (b).
Verify the RTC for the BT/GPS.
X2 (3pin): Square waveform,
32.768kHz,1.8Vp-p
Is the BT headset charged enough?
Is the BT headset turned on?
Is the BT headset in pairing mode?
Charge the BT headset. Turn on your BT headset and bring
it within one to 2 meters.
Try again pair with BT headset.
Yes
Pass
Pass
Pass
Pass
Verify the RTC Line circuit for
the BT/GPS.
Visual check of X2, L8, C39
(Whether not damaged)
Replace any abnormal parts.
[The BT/GPS power supply
line 33BT circuit is faulty]
Visual check of
the PCB side A
parts (Whether not damaged)
L4, C15, C19, C20, C33
Replace any abnormal parts.
[The BT/GPS power supply
line 18BT circuit is faulty]
Visual check of
the PCB side A
parts (Whether not damaged)
C18, C13, C31, L8, C39
Replace any abnormal parts.
A