Failure Diagnosis Of The Bluetooth Section - Kenwood NX-5800 Service Manual

5.3

Failure diagnosis of the Bluetooth section

Over view:
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)
Bluetooth/GPS (IC5)
Level conversion IC (IC6, IC7)
TCXO 19.2MHz (X1)
32.768kHz clock (X2)
33BT Regulator (IC3)
18BT Regulator (IC2)
MPU/DSP IC (IC706)
I can not pair with the Bluetooth (BT) headset.
Make sure the BT headset have enough power?
Turn on your BT headset?
Put your BT headset into pairing mode?
When a normal
condition is confirmed.
Check the Module (BT/GPS) unit PCB side A.
Check the Module (BT/GPS) unit PCB side A.
When a normal
condition is confirmed.
Verify the ANT Matching Parts.
Visual check of L15, C68
(Whether not damaged)
When a normal
condition is confirmed.
Verify the BT/GPS power supply.
(33BT) L4: 3.3V
When a normal
condition is confirmed.
Verify the BT/GPS power supply.
(18BT) L15: 1.8V
When a normal
condition is confirmed.
Verify the RTC for the BT/GPS.
X2 (3 pin): Square waveform,
32.768kHz,1.8Vp-p
When a normal
condition is confirmed.
IC706
UART
MPU/DSP
IC
PCM
MAIN UNIT
No
When an abnormal
condition is confirmed.
Replace any abnormal parts.
[The BT/GPS power supply
When an abnormal
line 33BT circuit is faulty]
condition is confirmed.
Visual check of the PCB side A parts.
(Whether not damaged)
L4, C15, C19, C20, C33
Replace any abnormal parts.
When an abnormal
[The BT/GPS power supply
condition is confirmed.
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.
When an abnormal
Verify the RTC Line circuit for
condition is confirmed.
the BT/GPS.
Visual check of X2, L8, C39
(Whether not damaged)
Replace any abnormal parts.
IC6 IC5
UART UART
Level
conversion
IC
BT/GPS
IC
IC7
PCM PCM
Level
conversion
IC
X1
TCXO
19.2MHz
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
L11
Bluet oot h
LC
Ant enna
Filt er
Pattern Antenna
X2
32.768kHz
MODULE (BT/GPS)
Clock
UNIT
Charge the BT headset. Turn on your BT headset and bring it
within one to two meters.
Try again pair with BT headset.
Check the Module (BT/GPS) unit
PCB side B (a).
Check the Module (BT/GPS) unit
PCB side B (b).
(No.RA017<Rev.002>)1-71