(No.RA070<Rev.001>)1-59
5.2
Failure diagnosis of the GPS section
Overview:
When the GPS function does not operate, use this flowchart to determine the problem.
BT/GPS IC (IC351)
When the BT/GPS IC is problematic, it is necessary to replace the printed circuit board by the Service Main unit in service. Various
ESN/default adjustment values are written on the service unit. Please refer to "5.6 Replacing Main Unit".
Major parts for a GPS circuit
• GPS antenna (Connect on CN152, CN153)
• Front End Module (A151)
• SAW Filter (L359)
• BT/GPS IC (IC351)
• Level conversion IC (IC352, IC353)
• TCXO 19.2MHz (X401)
• 32.768 kHz clock (X351)
• 32BT Regulator (IC8)
• 18BT Regulator (IC7)
• MPU/DSP IC (IC401)
Positioning is not carried out normally.
Are you operating at a location that is suitable for
receiving the GPS signals?
Operate at place where is good visibility of the sky.
Verify the contact of the GPS internal antenna with
the PCB.
Re-assembling the GPS antenna correctly
If an antenna is defective, replace the GPS internal antenna.
Fail
Pass
Verify the ANT Matching Parts.
Visually check to C172, L173.
Fail
Replace any abnormal parts.
Check the DISPLAY UNIT PCB.
Fail
Pass
Pass
Verify the High Pass Filter Parts.
Verify the C175, L176, C177, L178, C179,
D180 and D181.
Fail
Replace any abnormal parts.
Replace any abnormal parts.
Verify the FEM.
Verify the L187, C184, C186, R189 and
C190. Check the voltage of the C192 with
the side CN157. And verify PCB side B
parts L194, C193 and R191.
Fail
Check the MAIN UNIT PCB.
Pass
Pass
Check the DISPLAY UNIT PCB.
MPU/DSP
IC
Level
conversion
IC
Level
Conversion
IC
BT/GPS
IC
RF
Matching
SAW
Filter
ATT
Hyper
Pogo
FEM
HPF
ANT
Matching
GPS
ANT
Current
Monitor
Circuit
32.768kHz
Clock
TCXO
19.2MHz
PCM
A151
CN354
CN356
IC353
IC401
DISPLAY UNIT
MAIN UNIT
SheetMetal
L359
UART
UART
PCM
IC352
IC351
X401
X351
Содержание NX-3400
Страница 70: ...1 70 No RA070 Rev 001 ESN Label Layout Note Cut a ESN Label at dotted line ESN Label ...
Страница 82: ... No RA070 Rev 001 2 12 2 12 No RA070 Rev 001 MEMO ...
Страница 84: ... MEMO No RA070 Rev 001 2 14 ...
Страница 97: ...MEMO ...
Страница 98: ... No RA070 Rev 001 JKS Printed in Japan JVC KENWOOD Corporation Communications Systems Division ...