Nokia NPE-4 Service Manual page 12

Customer Care Europe & Africa
SCCE Training Group
Flowchart - No service → → → → no RX
Check RX-line to X102
antenna connector for
shorts or disconnections
nOK
Check
PCN RX-Signal
1842.4 MHz, Ch. 700,
at L616
OK
Check G740 26 MHz
oscillator circuit
© NMP 2002
No Service /
No RSSI
Set Phone to RX-Burst-Mode.
Set RF Generator to Ch. 37,
RX-level -55 dBm
Set Spectrum Analyzer to
RX EGSM 942.4 MHz,
.
Check
RX I/Q-Signal 67.71 kHz
,Vpp=1.1V at C721 (set
oscilloscope to DC-Mode)
500 mV, Time base
1 ms.
nOK
Check
Dtos 67.71 kHz OK
at C714.
nOK
Check
nOK RX-Signal 942.4 MHz,
at L626
OK
Check
Sys CLK 26 MHz
nOK
Vpp = 800 mV at
C752
OK
Check
following voltages:
VR3 = 2.8 VDC at C602; VR1A = 4.7 VDC
at C600; VR4 = 2.8 VDC at C601;
VR5 = 2.8 VDC at C604; VR6 = 2.8 VDC
at C605; VR7 =2.8 VDC at R630;
VREFRF01 & VREFRF02
= 1.35 V at R726
OK
Change N600
Hagar
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
OK
Check
CP_F I/Q (BIQUAD)
OK
67.71 kHz
at C714
nOK
Check
C714 for cold or
nOK
broken
solderings.
OK
Check
following voltages :
OK
VR4 = 2.8 VDC at C601;
VR6 = 2.8 VDC
at C605
nOK
nOK
Checked by:
SCCE Training Group
12 (25)
Repairhints
Version 1.0 Approved
Check D200
UEM
Change N600
Hagar
Change C714
Change N600
Hagar
Check D200
UEM
Approved by:
SCCE