Nokia NPE-4 Service Manual page 20

Customer Care Europe & Africa
SCCE Training Group
Oscilloscope settings:
Ampl: 500mV
Time/Div: 1ms/Div
AC/DC/GND: DC
If one of the four TX I/Q signals are missing or to 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 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 Maintenance/RF controls. Set phone to TX 1800 / Powerlevel 0 and/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 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
Checked by:
SCCE Training Group
20 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE