1-62 (No.RA075<Rev.001>)
[The MPU/DSP IC is abnormal]
Replace the PCB.
Check the Main unit PCB.
[The 18BT_HCI TX (RXD2)
line circuit is faulty]
Visual check of the CP1, IC6, R22
(Whether not damaged)
Replace any abnormal parts.
Fail
Pass
Verify the RF input circuit for the GPS.
SAW, GPS IC RF Matching parts
[The GPS RF input circuit is faulty]
Replace the GPS RF input circuit
parts. (only the parts which can be
replaced.) If any unchangeable
parts are abnormal, replace the PCB.
Verify the BT/GPS control signal
(BTMF_nSHUTDoWN).
IC1 (5pin): 1.8V
Verify the BT/GPS control
signal (BT/_SHUTDOWN).
CN1 (14pin): 3.3V
Verify the BT/GPS control
signal (18BT_RX).
IC6 (7pin):
Square waveform UART data
of 1.8V logic.
Baud rate:
Default: 115.2Kbps
After: 3.967Mbps.
Check the Main unit PCB.
Check the Main unit PCB.
Check the Main unit PCB.
[/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 (6pin):
Square waveform UART data
of 3.3V logic.
[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 (8pin):
Square waveform UART data
of 1.8V logic.
Verify the BT/GPS control
signal (RXD2).
CN1(7pin): Square waveform
UART data of 3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
Fail
Check the Module (BT/GPS) unit PCB side B.
Verify the BT/GPS power
supply.
(33GPS) L6: 3.3V
Verify the power supply voltage
after removing the KRA-40.
(33GPS) L6: 3.3V
[The KRA-40 may be broken]
Replace the KRA-40.
Fail
Pass
Verify the power supply voltage
and the BT/GPS control signal.
CN1 (1pin, 2pin) : 5.4V
CN1 (16pin) : 3.3V
Check the Main unit PCB.
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Fail
Fail
[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