1-66 (No.RA073<Rev.001>)
5.2
Failure diagnosis of the GPS section
Overview:
When the GPS function does not operate, use this flowchart to determine the problem.
Major parts for a GPS circuit
GPS antenna (KRA-40 (option))
Coaxial cable (E0E-0034-00)
SAW Filter (L9)
BT/GPS IC (IC5)
Level conversion IC (IC6,IC7)
TCXO 19.2MHz (X1)
32.768kHz clock (X2)
33BT Regulator (IC3)
18BT Regulator (IC2)
33GPS Regulator (IC4)
MPU/DSP IC (IC706)
IC706
IC6
IC5
UART
UART
UART
L9
GPS antenna unit
IC7
PCM
PCM
PCM
coaxial cable
MAIN UNIT
X1
X2
CN5
MODULE (BT/GPS)
UNIT
MPU/DSP
IC
BT/GPS
IC
TCXO
19.2MHz
32.768kHz
Clock
RF
Matching
GPS
Antenna
Level
conversion
IC
Level
conversion
IC
SAW
Filter
Bias
Positioning is not carried out normally.
When the power supply is ON,
“
No GPS Antenna
” is displayed.
Verify the connection of KRA-40.
(SMA connector)
Connect the KRA-40 correctly.
Check the Module (BT/GPS)
unit PCB side A.
No
Fail
Fail
Yes
Pass
Pass
Verify the connection of the SMA
connecting cable.
CN5 - E0E-0034-00
Connect the cable to
the CN5 correctly.
Check the Module (BT/GPS) unit PCB side B.
Verify the BT/GPS power supply.
(33BT) L4: 3.3V
[The BT/GPS power supply
line 33BT circuit faulty]
Visual check of the PCB side A parts
(Whether not damaged)
L4, C15, C19, C20, C33
Replace any abnormal parts.
Fail
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
Verify the reference clock for the
BT/GPS.
(BT_CLK) Intersection of C8 and
C9: Clipped Sine waveform,
19.2MHz, 0.2 to 1.2 Vp-p
Check the Module (BT/GPS) unit
PCB side B.
Verify the RTC line circuit for
the BT/GPS.
Visual check of X2, L8, C39
(Whether not damaged)
Replace any abnormal parts.
Verify the BT/GPS power supply.
(18BT) L5:1.8V
[The BT/GPS power supply
line 18BT circuit is faulty]
Visual check of the PCB side A parts
(Whether not damaged)
C18, C13, C31, L8, C39
Replace any abnormal parts.
Check the
Module (BT/GPS) unit
PCB side B.
Verify the RTC for the BT/GPS.
X2 (3pin): square waveform,
32.768kHz, 1.8Vp-p
[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.
Check the Module (BT/GPS) unit PCB side B.
Check the Module (BT/GPS) unit PCB side A.
Содержание NX-5700HB
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