1-100 (No.RA020<Rev.002>)
Descriptions of signal names
(1) 33BT: BT/GPS IC 3.3V power supply
(2) 18BT: BT/GPS IC 1.8V power supply
(3) 33GPS: BT/GPS IC 3.3V power supply
(4) TXD2: BT/GPS serial data line connected to UART TX of MPU/DSP IC (MPU/DSP to BT/GPS IC)
(5) RXD2:BT/GPS serial data line connected to UART RX of MPU/DSP IC (MPU/DSP to BT/GPS IC)
(6) 18BT_HCI_RX: BT/GPS serial data line connected to UART RX of BT/GPS IC (MPU to BT/GPS IC)
(7) 18BT_HCI_TX: BT/GPS serial data line connected to UART TX of GPS IC (BT/GPS IC to MPU)
(8) /BT_SHUTDOWN: BT/GPS active control of MPU/DSP IC (MPU/DSP to BT/GPS IC) High
→
Active, Low
→
Reset
Check the Main unit PCB.
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
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.
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.
Verify the BT/GPS control
signal (G_RXD2).
CP705, (3 pin):
Square waveform UART data
of 1.8V logic.
[The MPU/DSP IC is abnormal]
Replace the PCB.
Verify the BT/GPS control
signal (G_TXD2).
CP705 (2 pin):
Square waveform UART data
of 3.3V logic.
[The MPU/DSP IC is abnormal]
Replace the PCB.
[The TXD2 (18BT_HCI_RX)
line circuit is faulty]
Replace the CP705.
[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
Page 106: ...MEMO ...
Page 137: ...MEMO ...
