Nokia NPE-4 Service Manual page 13

Customer Care Europe & Africa
SCCE Training Group
No service → → → → no TX
Check EGSM TX signal at R656 / R657 (See picture below)
Set spectrum analyzer to TX EGSM 897.4 MHz, channel 37.
Set phone to TX mode, EGSM 897.4 MHz, channel 37 and power level 10.
If there is no signal measurable, check PCN TX signal at L662 (See picture below)
Set spectrum analyzer to TX PCN 1747.8 MHz, channel 700.
Set phone to TX mode, PCN 1747.8 MHz, channel 700 and power level 10.
If both TX signals ok, check EGSM/ PCN TX lines between Hagar N600 and antenna connector X802 for shorts or disconnections
If there is no TX signal measurable at L662, check TX I/Q at C764 and C766 on both sides of capacitors.
(See picture below)
Oscilloscope settings:
Ampl: 500mV
Time/Div: 1ms/Div
AC/DC/GND: DC
If the TX I/Q signal is not ok, check UEM D200
© NMP 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
Checked by:
SCCE Training Group
13 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE