(No.RA054<Rev.001>)1-157
Pass
Check the BT/GPS UNIT PCB side A.
Pass
Verify the BT/GPS power
Fail
supply.
(33BT) L4: 3.3V
Pass
Verify the BT/GPS power
supply.
(18BT) L5: 1.8V
Pass
Fail
Fail
Verify the RTC for the
BT/GPS.
X2 (3 pin): Square waveform,
32.768 kHz, 1.8Vp-p
Pass
Fail
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
Pass
Check the BT/GPS UNIT PCB side B.
Check the BT/GPS UNIT PCB side B.
Pass
Fail
Fail
[The BT/GPS power supply
line 33BT circuit is faulty]
Verify the PCB side A parts.
L4, C15, C19, C20, C33
Replace any abnormal parts.
[The BT/GPS power supply
line 18BT circuit is faulty]
Verify the PCB side A parts.
C18, C13, C31, L8, C39
Replace any abnormal parts.
Check the BT/GPS UNIT
PCB side B (a).
Check the BT/GPS UNIT
PCB side B (b).
Verify the RTC line circuit for
the BT/GPS.
X2, L8, C39
Replace any abnormal parts.
[The reference clock circuit
for the BT/GPS is faulty]
Verify the R9, Q1, R10, R26,
R12, R13, X1, C4, C8, C9
Replace any abnormal parts.
Fail
Verify the BT/GPS power
supply.
(33GPS) L6: 3.3V
Fail
Fail
Verify the power supply voltage
after removing the KRA-40.
(33GPS) L6:3.3V
[The BT/GPS power supply
line 33GPS circuit is faulty]
C7, C23, C24, R15, C25, R16,
R19, C26, C27, C29, L2, R14,
C3
Replace any abnormal parts.
[The KRA-40 may be
broken]
Replace the KRA-40
[The BT/GPS IC is
abnormal]
Replace the PCB.
[The GPS RF input circuit is faulty]
Replace the GPS RF input circuit
parts. (only the parts which can be
replaced) If any unexchangeable
parts are abnormal, replace the PCB.
Fail
Verify the RF input circuit for the GPS.
SAW, GPS IC RF Matching
From connecter to SAW: CN5, C40, R24, R23
SAW parts: L9, D17, D18
GPS IC RF Matching parts: C38, C36, L7
Summary of Contents for NX-3720
Page 188: ...MEMO No RA054 Rev 001 2 20 ...
