Kenwood NX-5300 F2, Руководство по обслуживанию

Страница: 70 / 98

1-70 (No.RA015<Rev.001>)
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 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]
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.
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.
[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
Verify the RTC line circuit for the BT/GPS.
X850, L854, C875
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.