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Oscilloscope settings:
Ampl:
500mV
Time/Div:
1ms/Div
AC/DC/GND:
DC
If one of the four TX I/Q signals is missing or too low (TX IN, TX IP and TX QN, TX QP), check R713 on both sides.
If TX I/Q signals towards UEM D200 are not ok, UEM or PWB is faulty.
If one of the voltages described is missing, probably UEM D200 is faulty.
If all signals towards RF-IC N601 are ok, change Mjoelner N601.
No TX 1800/1900
Check VAPC_DCS signal at R821 (see picture below).
Use Phoenix and open menu Testing/RF controls. Set phone to TX 1800 / Powerlevel 0 or 15.
Oscilloscope settings:
Ampl:
50mV
Time/Div:
2ms/Div
AC/DC/GND:
DC
Powerlevel 0
Powerlevel 15
If there is no signal measureable, check R821, R820 and C832 for cold or broken solderings and resolder or change if
necessary. If all three components are ok, change N601 Mjoelner.
© NMP 2003
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 22.04.2003
Checked by:
SCCE Training Group
24 (29)
Repair Hints
Version 3.0 Approved
Approved by:
SCCE
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