Nokia NPL-4 Series Troubleshooting Instructions page 100

NPL-4/5/RM-104
Troubleshooting Instructions
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
from C162 and
C163.
Is it 1kHz
0.5–0.8Vp–p?
NO
Check
C107, C108,
C109, C117 ,
L105,C367,C378,
C379, L358.
Measure signal
from C162, C163
Is it 1kHz
0.5–0.8
Vp–p?
NO
Check
R359,R360,
V356, V357,
L356,L357,C357,
C358,C362.
Measure
signal from
J103, J104,
OK ?
NO
Change
N356.
Measure signal
from J103 and J104.
Is it
OK ?
NO
Change
radio module TB4
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Figure 41: FM radio troubleshooting diagram
Check
C374, C375, R375,
NO
R372
R358 and measure
32kHz clock signal
from J359,
retest starting.
Start OK ?
YES
YES
Check
R164,
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
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
C162 and C163.
Are both cases
1 kHz 0.5 – 0.8 Vp–p ?
NO
Check
V356, V357, L356,
L357, C357, C358, C362,
R359, R360.
Test again with
87.5 and 108.0 MHz.
Measure audio from
C162 and C163.
Both
OK?
NO
Change
V356 and 357.
BOTH !
Retest with
87.5 and 108.0 MHz.
Measure audio from
C162 and C163.
Both OK ?
NO
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Check
:
N356 solders
NO
(pins 5,6,7,8,9,11,
12,13,17,33,34,35,
,
R364,
36, 37.
R368,
Start OK
R362
now ?
NO
Start OK
now
YES Change
N356.
Radio start
OK
now?
NO
Baseband digital
fault (UPP)
YES
Audio
Amplifier
failure
(N150)
YES
YES
Issue 2 05/05