Kenwood NX-5800 Service Manual page 72

When a normal
condition is confirmed.
Verify the reference clock for the
BT/GPS.
(BT_CLK) Intersection of
C8 and C9: Sine waveform,
19.2MHz 0.2 to 1.2 Vp-p
When a normal
condition is confirmed.
Check the Module (BT/GPS) unit PCB side B.
Check the Module (BT/GPS) unit PCB side B.
When a normal
condition is confirmed.
Verify the ANT Matching Parts.
Visual check of R27, R29
(Whether not damaged)
When a normal
condition is confirmed.
Verify the BT/GPS control signal
(BTFM_nSHUDoWN).
IC1 (5 pin): 1.8V
When a normal
condition is confirmed.
Verify the BT/GPS control
signal (18BT_RX)
IC6 (7 pin):
Square waveform UART data
of 1.8V logic.
Defeult: 115.2kbps
After: 3.967Mbps.
When a normal
condition is confirmed.
1-72 (No.RA017<Rev.002>)
[The reference clock circuit
When an abnormal
for the BT/GPS is faulty]
condition is confirmed.
Visual check of the R9, Q1, R10, R26, R12, R13,
X1, C4, C8, C9 (Whether not damaged)
Replace any abnormal parts.
When an abnormal
condition is confirmed.
Replace any abnormal parts.
When an abnormal
Verify the BT/GPS control signal
condition is confirmed.
(/BT_SHUTDOWN).
CN1 (14 pin): 3.3V
[/BT_SHUTDOWN Line circuit
is faulty]
Visual check of the IC1, R7
(Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS control
When an abnormal
signal (TXD2).
condition is confirmed.
CN1 (6 pin):
Square waveform UART data
of 3.3V logic.
[The 18BT_HCI_RX(TXD2)
line circuit is faulty]
Visual check of the CP1, IC6, R22
(Whether not damaged)
Replace any abnormal parts.
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
Check the Main unit PCB (a).
Check the Main unit PCB (b).