CONFIDENTIAL 13 (18)
Customer Care Europe & Africa NHM-7 Repairhints
SCCE Training Group Version 1.0 Approved
2002 Nokia Mobile Phones
Date 28.02.2002
© NMP 2002
Checked by:
SCCE Training Group
Approved by:
SCCE
CHAPTER 8 NO SERVICE
In case that this fault occurs with your phone, the first thing you should do is to calibrate RX/TX-values of the phone. If for
example TX-power is not measurable or too low, continue with the chapter below. If RX does not work, continue with the
corresponding chapter on page 16. If RX and TX do not work check parts which are needed for both signalpathes (e.g. oscillators
G650/660, Hagar N600 or UPP D400).
No or too low TX-power
Use Phoenix to set phone into
TX-burstmode (GSM900
Ch.37, GSM1800 Ch.700).
Check
TX/IQ signals at both
sides of C616/617
GSM 1800 GSM 900
Check
1747.8MHz at
L702
Check
897.4MHz at
C726
Check
897.4MHz at
C704
Check
897.4MHz at
L750 pin1
Check
897.4MHz at
J501
Check
1747.8MHz at
L750 pin3
Check
1747.8MHz at
J501
check R607/608,
probably UEM D200 faulty
Check signals for HAGAR N600:
VR1A 4.75VDC at C600; VR2 2.8VDC at C723;
VR3 2.8VDC at C602/662; VR4 2.8VDC at C601; VR5 2.8VDC at C603;
VR6 2.8VDC at C605; VREFRF_1 1.35VDC at C613;VREFRF_2 1.35VDC at
C612; RFBUSDA at J2; RFBUSCLK at J3; RFBUSEN1 at J4; TXC at C615.
Check SHF oscillator at T650 pin3/4 (GSM900 TX Ch.37: 3589.6MHz,
GSM1800 TX Ch.700: 3495.6MHz)
If signals are ok but no TX-signal is measurable at C700/726, change
HAGAR N600. Probably UPP D400 faulty
Check/change Z700,
R706/707, C701/702
Check C731 or
change N700
Ckeck L750/Z500 in
& out, also check
C716
Check/change
N700
Check/change
T700, R705, C705
No or too low
TX-power
nOK
OK
OK
OK
OK
nOK nOK
nOK
nOKnOK
OK
OK OK
nOK nOK
Check 26MHz
REFCLK at C660,
frequency deviation
<100Hz
OK
nOK
Check VR3 2.8VDC at C662,
also check AFC-voltage at C661,
normally 1.25VDC.
Change G660 if frequency deviation
is >100Hz.
Ckeck L750/Z500 in
& out, also check
C717
Check
1747.8MHz at
R705
OK
OK
nOK
To Next Page
Loading...
