(No.RA015<Rev.001>)1-67
Verify the reference clock for the BT/GPS.
(BT_CLK) Intersection of
C850 and R861: Sine waveform,
19.2MHz, 0.2 to 1.2 Vp-p
[The reference clock circuit
for the BT/GPS is faulty].
Verify the BT/GPS control
signal (RXD2).
CP851 (1 pin): Square waveform
UART data of 3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
Check the PCB side B (c).
Verify the BT/GPS control
signal (TXD2).
CP851 (2 pin):
Square waveform UART data
of 3.3V logic.
Verify the PCB side A parts
C850, R861, R862.
Replace any abnormal parts.
Verify the LNA power supply
VDD_TCXO (G1 pin) of IC850
(Intersection of C855 and R862): 1.8V
[The power supply line circuit
for LNA is faulty]
Verify the C855, R862 and R851.
Replace any abnormal parts.
[VDD_TCXO (G1 pin) of
IC850 is faulty]
Replace the PCB
Verify the BT/GPS control
signal (18BT_HCI_RX).
IC852 (8 pin):
Square waveform UART data
of 1.8V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
[MPU/DSP (IC702) is faulty]
Replace the PCB.
[The 18BT_HCI_RX (TXD2)
line circuit is faulty]
Verify the CP851, IC852, R858
Replace any abnormal parts.
Verify the BT/GPS control
signal (18BT_HCI_TX).
IC852 (8 pin):
Square waveform UART data
of 1.8V logic.
[BT/GPS IC (IC850) is faulty]
Replace the PCB.
Check the PCB side B.
Check the PCB side B.
[The RXD2 (18BT_HCI_TX)
line circuit is faulty]
Verify the CP851, IC852, R858
Replace any abnormal parts.
Verify the LNA ENABLE.
IC851 (6 pin): 1.8V
[The LNA ENABLE line is faulty]
Verify the R860.
Replace any abnormal parts
[GPS_EXT_LNA_EN
(H6 pin) of IC850 is
faulty]
Replace the PCB.
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 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.
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 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.
