Nokia 7250, 7250i サービスマニュアル
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Set phone into local mode.
Start FM radio.
Does
the radio
start ?
Check
C374, C375, R375,
R358 and measure
R358 and measure
32kHz clock signal
from J359,
retest starting.
Start OK ?
NO
NO
NO
Measure
voltages from
pins 7 and 34,
is it –2.7 V ?
Retest starting.
Start OK now ?
Start OK now ?
Check
N356 solders
(pins 5,6,7,8,9,11,
12,13,17,33,34,35,
36, 37.
Start OK
now ?
Change
N356.
Radio start
OK
now?
Baseband digital
fault (UPP)
NO
NO
OK, RETEST IN FLALI
YES
YES
YES
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?
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 ?
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?
OK?
Check
C107, C108,
C109, C117 ,
L105,C367,C378,
C379, L358.
Measure signal
from C162, C163
Is it 1kHz
0.5–0.8
Vp–p?
Check
R359,R360,
V356, V357,
L356,L357,C357,
C358,C362.
Measure
signal from
J103, J104,
OK ?
Check
R164,
R165, R166,
R167, L103,L104
Measure
signal from J103
and J104.
Is it
0.015–0.3
Vp–p?
NO
NO
NO
Audio
Amplifier
failure
(N150)
NO
YES
YES
NO
Change
N356.
Measure signal
from J103 and J104.
Is it
OK ?
Change
radio module TB4
OK, RETEST IN FLALI
Change
V356 and 357.
BOTH !
Retest with
87.5 and 108.0 MHz.
Measure audio from
C162 and C163.
Both OK ?
NO
YES
YES
YES
YES
YES
YES
NO
NO
E
Nokia Corporation