1-100 (No.RA018<Rev.002>)
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.
C850, R861, R862.
Replace any abnormal parts.
Verify the BT/GPS control
signal (18BT_HCI_RX).
IC852 (8pin):
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]
Visual check of the CP851, IC852, R858
(Whether not damaged)
Verify the BT/GPS control
signal (18BT_HCI_TX).
IC852 (8 pin):
Square waveform UART data
of 1.8V logic.
Check the PCB side B.
Check the PCB side B.
[The RXD2 (18BT_HCI_TX)
line circuit is faulty]
Replace the CP851, IC852, R858
[BT/GPS IC (IC850) is faulty]
Replace the PCB.
Verify the RTC for the BT/GPS.
X850 (3 pin):
Square waveform, 32.768kHz, 1.8Vp-p
Visual check of the RTC line circuit for the BT/GPS.
X850, L854, C875 (Whether not damaged)
Replace any abnormal parts.
[The BT/GPS IC is abnormal]
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 an abnormal
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.
Visual check of the PCB side A parts
(Whether not damaged)
