Kenwood NX-5700HB, Руководство по обслуживанию

Страница: 70 / 106

1-70 (No.RA073<Rev.001>)
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
Fail
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
Pass
Check the Module (BT/GPS) unit PCB side B.
Check the Module (BT/GPS) unit PCB side B.
Verify the ANT Matching Parts.
Visual check of R27, R29.
(Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS control signal
(BTFM_nSHUDoWN).
IC1 (5pin): 1.8V
Check the Main unit PCB (a).
Verify the BT/GPS control
signal (TXD2).
CN1 (6pin):
Square waveform UART data
of 3.3V logic.
Verify the BT/GPS control signal
(/BT_SHUTDOWN).
CN1 (14pin): 3.3V
Check the Main unit PCB (b).
[/BT_SHUTDOWN Line circuit
is faulty]
Visual check of
the IC1, R7
(Whether not damaged)
Replace any abnormal parts.
[The 18BT_HCI_RX(TXD2)
line circuit is faulty]
Visual check of the CP1, IC6, R22
(Whether not damaged)
Replace any abnormal parts.
Pass
Pass
[The reference clock circuit
for the BT/GPS is faulty]
Visual check of the R9, Q1, R10, R26, R12, R13,
X1, C4, C8, C9 (Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS control
signal (18BT_RX)
IC6 (7pin):
Square waveform UART data
of 1.8V logic.
Default: 115.2kbps
After: 3.967Mbps.
A
B