(No.RA017)1-73Check 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 controlsignal (RXD2).CN1 (7 pin): Square waveformUART data of 3.3V logic.Baud rate:Default: 115.2kbpsAfter: 3.967Mbps.Check the Main unit PCB (c).Verify the BT/GPS controlsignal (18BT_HCI_TX.).IC6 (18 pin):Square waveform UART dataof 1.8V logic.When an normalcondition is confirmed.[The RXD2 (18BT_HCI_TX)line circuit is faulty]Replace any abnormal parts.[The BT/GPS IC is abnormalReplace the PCB.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.Visual check of the CP1, IC6, R22Replace theReplace theCheck the Main unit PCB.When an abnormalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.Verify the BT/GPS controlsignal (TXD2).CN735 (15 pin): Squarewaveform UART data of 3.3Vlogic.Baud rateDefault: 115.2kbpsAfter: 3.967Mbps.Verify the BT/GPS controlsignal(RXD2).CN735 (14 pin): Square waveformUART tada of 3.3V logic.Baud rate:Default: 115.2kbpsAfter: 3.967Mbps.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.Verify the BT/GPS controlsignal (18BT_HCI_TX).CP705, (4 pin):Square waveform UART dataof 1.8V logic.When an normalcondition is confirmed.[The MPU/DSP IC is abnormal]Replace the PCB.Descriptions of signal names1) 33BT: BT/GPS IC 3.3V power supply2) 18BT: BT/GPS IC 1.8V power supply3) 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 ResetVerify the BT/GPS controlsignal (G_TXD2).CP705 (3 pin):Square waveform UART dataof 3.3V logic.[The MPU/DSP IC is abnormalReplace the PCB.When an abnormalcondition is confirmed.[The RXD2 (18BT _HCI_TX)line circuit is faulty]Replace the CP705.When an normalcondition is confirmed.[The RXD2 (18BT _HCI_TX)line circuit is faulty]Replace the CP705.[The MPU/DSP IC is abnormal]Replace the PCB.
