Nokia NEM-4 Series Troubleshooting Instructions page 53

CCS Technical Documentation
Set phone into local mode.
Start FM radio.
Does
the radio
start ?
YES
Connect RF test signal (note1)
Set radio channel to 98.0 MHz
Set radio volume to max.
Measure
Audio signal
C017 and
from C162 and
C018
C163.
Is it 1kHz
0.5–0.8Vp–p?
NO
Check
C516, C519
C107, C108,
C501, C502, C001
C109, C117 ,
C002, L500, L503 L105,C367,C378,
C379, L358.
Measure signal
C017, C018
from C162, C163
Is it 1kHz
0.5–0.8
Vp–p?
NO
Check
R503, R504, V500
R359,R360,
V501, L501, L502
V356, V357,
L356,L357,C357,
C512, C513, C511
C358,C362.
Measure
signal from
J103, J104,
OK ?
NO
Change
N500
N356.
Measure signal
from J103 and J104.
Is it
OK ?
NO
Change
radio module TB4
Issue 1 09/2003
Company Confidential
Figure 13: FM radio Troubleshooting diagram
Check
C521, C522, R505
C374, C375, R375,
NO
R358 and measure
32kHz clock signal
L511
from J359,
retest starting.
Start OK ?
YES
YES
Check
C005, C006, R028
R164,
R029, L002, L003 R165, R166,
YES
R167, L103,L104
NO
Measure
signal from J103
and J104.
Is it
0.015–0.3
Vp–p?
YES
YES
YES
OK, RETEST IN FLALI
Copyright  2003 Nokia Corporation
Company Confidential
Measure
NO
voltages from
pins 7 and 34,
is it –2.7 V ?
Retest starting.
Start OK now ?
YES
OK, RETEST IN FLALI
Set
Radio and RF generator
to 87.5 and 108.0 MHz.
Measure Audio from
C017, C018
C162 and C163.
Are both cases
1 kHz 0.5 – 0.8 Vp–p ?
NO
Check
R503, R504, V500, V501
V356, V357, L356,
L357, C357, C358, C362, L501, L502, C512, C513, C511
R359, R360.
Test again with
87.5 and 108.0 MHz.
Measure audio from
C017, C018
C162 and C163.
Both
OK?
NO
Change
N500
V356 and 357.
BOTH !
Retest with
87.5 and 108.0 MHz.
Measure audio from
C017, C018
C162 and C163.
Both OK ?
NO
E Nokia Corporation
NEM-4
BB Troubleshooting
Check
N500
N356 solders
NO
(pins 5,6,7,8,9,11,
12,13,17,33,34,35,
36, 37.
Start OK
now ?
NO
YES Change
N500
N356.
Radio start
OK
now?
NO
Baseband digital
fault (UPP)
YES
Audio
Amplifier
failure
(N150)
YES
YES
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