Kenwood NX-3400 Service Manual page 64

Pass
Verify the BT/GPS power
supply.
(18BT) C15: 1.8V
Pass
Check the PCB side B.
Check the PCB side B (a).
[The BT/GPS power supply line 32BT circuit is
faulty]
Verify the PCB side B parts.
L351, L366, R367
Replace any abnormal parts.
Check the PCB side B (b).
[The BT/GPS power supply line 18BT circuit is
faulty]
Verify the PCB side B parts.
L352, L365
Replace any abnormal parts.
Check the PCB side B.
Verify the reference clock for
the BT/GPS.
(BT_CLK) Intersection of
C356 and R360: Sine
waveform, 19.2MHz, 0.2 to
1.2 Vp-p
Pass
Verify the BT/GPS control
signal (18BT_HCI_RX).
IC352 (7pin):
Square waveform UART data
of 1.8V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
Pass
1-64 (No.RA070<Rev.001>)
[The BT/GPS power supply
Fail
line 18BT circuit is faulty]
Verify the parts.
IC8, L9, C16, C15, R8
Replace any abnormal parts.
Fail
Fail
[The reference clock circuit
for the BT/GPS is faulty]
Fail
Verify the parts
C356, R360, R361, .R413,
R412, C408, L402, C406,
Q401, R407, R405, R406,
C404, R404, X401, R401
Replace any abnormal parts.
Verify the BT/GPS control
signal (TXD2).
Fail
CP352 (2pin):
Square waveform UART data
of 3.2V logic.
[The 18BT_HCI_RX (TXD2)
line circuit is faulty]
Verify the CP352, IC352
Replace any abnormal parts.
Fail
[The BT/GPS IC is
abnormal]
Replace the PCB.
[The BT/GPS IC is
abnormal]
Replace the PCB.
Fail
Fail
Pass
Check the PCB
side B (b).
[MPU/DSP (IC401) is
faulty]
Replace the PCB.
[MPU/DSP (IC401) is
faulty]
Replace the PCB.