1-112 (No.RA015)Check the PCB side B (a).[The BT/GPS power supply line 33BT circuit isfaulty]Verify the PCB side B parts.IC39, IC38, C55, L850Replace any abnormal parts.Check the PCB side B (b).[The BT/GPS power supply line 18BT circuit isfaulty]Verify the PCB side A parts.IC37, L38, C52, C53, L851, L854, C875Replace any abnormal parts.[The BT/GPS IC is abnormal]Replace the PCB.[The BT/GPS IC is abnormal]Replace the PCB.[The BT/GPS IC is abnormal]Replace the PCB.Check the PCB side B (c).[The reference clock circuit for the BT/GPS is faulty]Verify the PCB side B parts.X700 (OUTPUT pin): Clipped sine wave,X700 (VCC pin): 3.3V,R700, R702, C701, C702, R704, C703, R705,R706, R780,Q700 (B, E): Clipped sine wave, Q700(C): 3.3V,R707, C704, C706, R708, C705, L701, C707,R772, C708Replace any abnormal parts.If any unexchangeable parts are 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 ResetWhen a normalcondition is confirmed.When a normalcondition is confirmed.When a normalcondition is confirmed.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.
