Nokia NPE-4 Service Manual page 15

Customer Care Europe & Africa
SCCE Training Group
Flowchart - No service → → → → no TX
Set Phone to TX -Mode
EGSM 897.4 MHz,
Ch. 37, power level 10.
Set Spectrum Analyzer to
TX EGSM 897.4 MHz, Ch.37
Check TX
EGSM 897,4 MHz
at R656.
© NMP 2002
No Service/
No TX EGSM/PCN
Set Phone to TX -Mode
Ch.700, power level 10.
Set Spectrum Analyzer to
PCN 1747.8 MHz, CH. 700
OK
nOK
nOK
Check TX I/Q
67.71 kHz signal at
C764 and C766 at
both sides.
OK
Check
TXP VDC > 1.8 V
at C760 with
oscilloscope
OK
Check TXC
signal at C761
with oscilloscope.
OK
Check 26 MHz
at C752.
OK
Check the
following voltages:
VR2 = 2.8 VDC at C294; VR3 = 2.8 VDC at
C602; VR4 = 2.8 VDC at C601;
VR5 = 2.8 VDC at C604; VR6 = 2.8 VDC at
C605; VR7 = 2.8 VDC at C299;
VrefRF01 & VrefRF02 = 1.35 VDC at R726;
VR1A = 4.7 V at R600
OK
Hagar N600
defect.
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
PCN 1747.8 MHz,
Check TX
PCN 1747.8 MHz OK
at L602.
nOK
nOK
nOK
nOK
nOK
Checked by:
SCCE Training Group
Repairhints
Version 1.0 Approved
Check TX EGSM/PCN path from
Hagar to X802 antenna connector
for shorts or disconnections.
Probably N840 defect.
Check UEM D200
Check UPP D400
Check UEM D200
Check 26 MHz
circuit, especially
G740
Check UEM D200
Approved by:
SCCE
15 (25)