Kenwood NX-5800 Service Manual page 111

Check the Module (BT/GPS) unit PCB side B.
When an abnormal
Verify the BT/GPS power
condition is confirmed.
supply.
(33GPS) L6: 3.3V
When a normal
condition is confirmed.
When an abnormal
Verify the RF input circuit for the GPS. condition is confirmed.
SAW, GPS IC RF Matching parts
When a normal
condition is confirmed.
When an abnormal
Verify the BT/GPS control signal
condition is confirmed.
(BTMF_nSHUTDoWN).
IC1 (5 pin): 1.8V
When a normal
condition is confirmed.
Verify the BT/GPS control
signal (18BT_RX).
When an abnormal
IC6 (7 pin):
condition is confirmed.
Square waveform UART data
of 1.8V logic.
Baud rate:
Default: 115.2Kbps
After: 3.967Mbps.
When a normal
condition is confirmed.
Verify the BT/GPS control
signal (RXD2). When an abnormal
CN1(7 pin): Square waveform condition is confirmed.
UART data of 3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
Verify the power supply voltage
after removing the KRA-40.
(33GPS) L6: 3.3V
When an abnormal
condition is confirmed.
Verify the power supply voltage
and the BT/GPS control signal.
CN1 (1 pin, 2 pin) : 5.4V
CN1 (16 pin) : 3.3V
When a normal
condition is confirmed.
[The BT/GPS power supply
line 33GPS circuit is faulty]
Visual check of the PCB side B parts
(Whether not damaged).
C23, C24, R15, C25, R16, IC4, C7,
R19, C26, C27, C29, L2, R14, C3
Replace any abnormal parts.
Visual check the following parts.
From connector to SAW: CN5, C40, R24, R23
SAW parts : L9(side A), D17, D18
GPS IC RF Matching parts(side A) : C38, C36, L7
Verify the BT/GPS control
signal (BT/_SHUTDOWN).
CN1 (14 pin): 3.3V
When a normal
condition is confirmed.
[/BT_SHUTDOWN line circuit
is faulty]
Visual check of the IC1, R7
(Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS control
signal (TXD2).
CN1 (6 pin):
Square waveform UART data
of 3.3V logic.
When a normal
condition is confirmed.
[The 18BT_HC1 RX (TXD2)
line circuit is faulty]
Visual check of the CP1, IC6, R22
(Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS control
signal (18BT_TX).
IC6 (8 pin):
Square waveform UART data
of 1.8V logic.
When a normal
condition is confirmed.
[The 18BT_HCI TX (RXD2)
line circuit is faulty]
Visual check of the CP1, IC6, R22
(Whether not damaged)
Replace any abnormal parts.
When a normal
condition is confirmed. [The KRA-40 may be broken]
Replace the KRA-40.
r
When an abnormal r
condition is confirmed.
Check the Main unit PCB.
[The GPS RF input circuit is faulty]
Replace the GPS RF input circuit
parts. (only the parts which can be
replaced.) If any unexchangeable
parts are abnormal, replace the PCB.
When an abnormal
condition is confirmed.
Check the Main unit PCB.
[The MPU/DSP IC is abnormal]
Replace the PCB.
When an abnormal
condition is confirmed.
Check the Main unit PCB.
When an abnormal
condition is confirmed.
Check the Main unit PCB.
When an abnormal
condition is confirmed.
Check the Main unit PCB.
When an abnormal
condition is confirmed.
(No.RA017<Rev.003>)1-111