(No.RA020<Rev.002>)1-103
Check the PCB side B (a).
[The BT/GPS power supply line 33BT circuit is faulty]
C5, C46, C44, C49.
[The BT/GPS IC is abnormal]
Replace the PCB.
Check the PCB side B (b).
[The BT/GPS power supply line 18BT circuit is faulty]
C2, C47, L5, L13, C45, C48.
[The BT/GPS IC is abnormal]
Replace the PCB.
Verify the BT/GPS control
signal (RXD2).
CN1 (7 pin): Square waveform
UART data of 3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
Check the Main unit PCB (c).
Verify the BT/GPS control
signal (18BT_HCI_TX.).
IC6 (18 pin):
Square waveform UART data
of 1.8V logic.
When an normal
condition is confirmed.
[The RXD2 (18BT_HCI_TX)
line circuit is faulty]
Replace any abnormal parts.
[The BT/GPS IC is abnormal
Replace the PCB.
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
When a normal
condition is confirmed.
When a normal
condition is confirmed.
When a normal
condition is confirmed.
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
Visual check of the CP1, IC6, R22
Replace the
Replace the
Check the Main unit PCB.
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
When a normal
condition is confirmed.
When a normal
condition is confirmed.
Verify the BT/GPS control
signal (TXD2).
CN735 (15 pin): Square
waveform UART data of 3.3V
logic.
Baud rate
Default: 115.2kbps
After: 3.967Mbps.
Verify the BT/GPS control
signal(RXD2).
CN735 (14 pin): Square waveform
UART tada of 3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
Verify the BT/GPS control
signal (18BT_HCI_TX).
CP705, (4 pin):
Square waveform UART data
of 1.8V logic.
When an normal
condition is confirmed.
[The MPU/DSP IC is abnormal]
Replace the PCB.
Descriptions of signal names
1) 33BT: BT/GPS IC 3.3V power supply
2) 18BT: BT/GPS IC 1.8V power supply
3) TXD2: BT/GPS serial data line connected to UART TX of MPU/DSP IC (MPU/DSP to BT/GPS IC)
4) RXD2:BT/GPS serial data line connected to UART RX of MPU/DSP IC (MPU/DSP to BT/GPS IC)
5) 18BT_HCI_RX: BT/GPS serial data line connected to UART RX of BT/GPS IC (MPU to BT/GPS IC)
6) 18BT_HCI_TX: BT/GPS serial data line connected to UART TX of GPS IC (BT/GPS IC to MPU)
7) /BT_SHUTDOWN: BT/GPS active control of MPU/DSP IC (MPU/DSP to BT/GPS IC) High
Active, Low
Reset
Verify the BT/GPS control
signal (G_TXD2).
CP705 (3 pin):
Square waveform UART data
of 3.3V logic.
[The MPU/DSP IC is abnormal
Replace the PCB.
When an abnormal
condition is confirmed.
[The RXD2 (18BT _HCI_TX)
line circuit is faulty]
Replace the CP705.
When an normal
condition is confirmed.
[The RXD2 (18BT _HCI_TX)
line circuit is faulty]
Replace the CP705.
[The MPU/DSP IC is abnormal]
Replace the PCB.
Summary of Contents for NX-5700
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