1-98 (No.RA018)HPF parts: C882, C881, C880, L859, L858Pre-SAW parts: L857, D850, D851LNA parts: C879, L856, C878, IC851, C876, C877, C874, R860ATT parts: R857, R856, R855Post-SAW parts: L853, GPS IC RF Matching parts: C867, C866, L852Verify the RF input circuit for the GPS.HPF, Pre-SAW, LNA, ATT, Post-SAW,GPS IC RF Matching.[The GPS RF input circuit is faulty]Replace the GPS RF input circuitparts. (only the parts which can bereplaced.) If any unexchangeableparts are abnormal, replace the PCB.Verify the RTC for the BT/GPS.X850 (3 pin): Square waveform, 32.768 kHz,1.8Vp-pReplace any abnormal parts.[The BT/GPS IC is abnormal]Replace the PCB.Check the PCB side B (a).[The BT/GPS power supply line 33BT circuit is faulty]Visual check of the PCB side B parts(Whether not damaged).IC39, IC38, C55, L850Replace any abnormal parts.[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]IC37, L38, C52, C53, L851, L854, C875Replace any abnormal parts.[The BT/GPS IC is abnormal]Replace the PCB.Check the PCB side B (c).[The BT/GPS IC is abnormal]Replace the PCB.[The reference clock circuit for the BT/GPS is faulty]Verify the PCB side B partsX700 (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,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 BT/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 Resetreplace the PCB.When a normalcondition 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.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.When an abnormalcondition is confirmed.Visual check of the RTC line circuit for theBT/GPS (Whether not damaged).X850, L854, C875Visual check of the PCB side B parts.(Whether not damaged).
