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FM radio troubleshooting diagram
Set phone into local mode.
Start FM radio
No
Does the
radio
start?
Yes
Connect RF test signal (note 1)
Set radio channel to 98.0 MHz
Set radio volume to maximum.
Measure
audio signal
from J6128
and J6129. Is
Yes
it 1 kHz 0.5 –
0.8 Vp-p?
No
Check C2032, C2033,
C2037, C2039, L2026,
Yes
C6104, C6109, C6115,
L6102. Measure signal
from J6128 and J6129.
Is it 1kHz 0.5 –0.8
Vp-p?
No
Check R6101 ,
R6103, V6100,
Yes
V6101, L6100,
L6101, C6100,
C6101 and C6102.
Measure signal
from J2023 and
J2024 Is it OK?
No
Change N6100.
Yes
Measure signal
from J2023 and
J2024. Is it OK?
No
Check Baseband
side
Notes to "FM radio troubleshooting diagram":
Use 1MHz 1X probe when measuring audio and clock signals with oscilloscope. Use active RF
probe when measuring frequencies with spectrum analyser.
FM radio RF test signal is connected from FM signal generator to FM radio antenna production
test point J2027.
RF test signal parameters:
•
Amplitude, A, -67.0 dBm
Issue 1 11/2004
Check C6105,
C6113, R6102 and
R6100 and
No
pins 7 and 34, is
measure 32kHz
clock signal from
J6103 and retest
starting. Does it
start now?
Yes
Check R2028,
R2029, R2030,
No
R2031, L2004 and
L2005. Measure
signal from J2023
and J2024. Is it
0.015-0.3Vp-p?
Yes
OK, retest
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Measure
Check N6100
No
voltages from
soldering, (pins
5,6,7,8,9,11,12,
it ~2.7V? Retest
13,17,33,34,35,3
starting. Does it
6,37) Does it
start now ?
Yes
Yes
OK, retest
Set radio and RF
generator to 87.5 and
108.0 MHz. Measure
audio from J6128 and
J6129. Are both cases
1kHz 0.5-0.8 Vp- p?
No
Check R6101, R6103,
V6100, V6101, L6100,
L6101, C6100, C6101
and C6102. Test again
with 87.5 and 108.0MHz.
Measure audio from
J6128 and J6129. Are
both cases OK?
No
Change V6100,
V6101 (BOTH!).
Test again with 87.5
and 108.0 MHz.
Measure audio from
J6128 and J6129.
Are both cases OK?
No
RM-12
No
start?
Change
N6100. Does
the radio start
Yes
now?
No
Baseband digital
failure (UPP)
Yes
Audio amplifier or
DAC failure
Yes
Yes
Page 90
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Troubleshooting
