CONFIDENTIAL 16 (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 9 RX DOES NOT WORK
RX does not work
Use Phoenix to set phone
into RX-burstmode
GSM900 Ch.37 / GSM
1800 Ch.700
Set RF-generator to a high
RF-level output
Check C500, L502
or change Z500/520
Check
942.4MHz at
C502
Check
1842.8MHz at
C552
Check
942.4MHz at
L501
Check
1842.8MHz at
L551
Check/change
V550/N600
Check/change
C555/556, Z551
Check/change
V500/N600
Check/change
C505/506, Z501
Check
942.4MHz at
C501
Check
1842.8MHz at
C551
Check
RXIQ-signals at
C608/611
Check
RXIQ-signals
at C608/611
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.
Check SHF oscillator at T650 pin3/4 (GSM900 RX Ch.37: 3769.6MHz,
GSM1800 RX Ch.700: 3685.6MHz)
If signals are ok but no RX-signal is measurable at C608/611, change
HAGAR N600. Probably UPP D400 faulty
GSM900
GSM1800
UEM D200 faulty in all
probability
OKOK
nOK nOK
Check VR3 2.8VDC at C662,
also check AFC-voltage at C661,
normally 1.2VDC.
Change G660 if frequency
deviation is >100Hz.
OK
OK
OK
OK
OKOK
nOK
nOK
nOK
nOK
Check 26MHz
REFCLK at C660,
frequency deviation
<100Hz
OK OK
nOK
Check C550 or
change Z500/520
nOK
nOK
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