C905
1222-9526 rev. 1
TROUBLESHOOTING
FM Radio Problems -
TROU
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FM Radio Antenna Problems
START
NOTE !
Be very careful when you
cut the Shield Can Fence to
avoid component damage
1:
Load ITP SW into the Phone
2:
Use TRS Fixture
Connect:
VBATT and DCIO/SEPI
3:
Use Fault Trace SW
and go to:
Audio and FM Radio
FM Radio
Audio Output: Loudspeaker
Freqvency: 103 MHz
Set FM Radio
FM Radio
Is not
working
neither
with
Loudspeaker
nor
PHF set
Yes
Is the
Loudspeaker
Ok
No
Go to
Loudspeaker
Problems TRS guide
No
Go to
Hands-Free (PHF)
Problems TRS guide
Yes
1:
Remove the DCIO/SEPI Cable
2:
Connect:
Customized FM Radio Cable
Black Lab Plug to
TRS Fixture GND Input and
PHF Connector to the
Phone System Connector
Signal Generator
Instrument Settings:
Frequency: 103 MHz
Amplitude/Level: 50
μ
V
FM Dev:
+/-22.5 kHz
FM Rate:
1 kHz
More than
40 mV AC Pk-PK
1 KHz signal at MP 122
(C3145) and MP 103
(C3146)
Is that
any signal on
MP 122 (C3145) and
MP 103 (C3146)
No
2.6 Volt DC
at MP 125 (ST2201)
and MP 124
(ST2206)
Yes
SL 5 Replace
N2000
SL 4 Escalate
No
1.8 Volt DC
at MP 120 (R3149)
Yes
SL 5 Replace
N2010
SL 4 Escalate
No
More than
40 mV AC Pk-PK
1 KHz signal at
MP 123 (R3151)
Yes
SL 5 Replace
N3103
SL 4 Escalate
No
Signal Generator
Instrument Settings:
Change Amplitude/Level to:
800
μ
V
Go to
FM Radio Antenna
Problems TRS guide
Yes
Is the any of
C3145 or C3146
Short circuit
No
SL 5 Replace
C3145 or C3146
SL 4 Escalate
Yes
1.8 Volt DC
at MP 25 (R3302
FM_INT)
No
SL 5 Replace
N2010
SL 4 Escalate
No
26 MHz BT_CLK
at MP 22 (ST2106)
Yes
No
SL 4 Replace
N1300
SL 5 Replace
N2100
SL 5 Replace
N2000
SL 4 Escalate
Replace
N1300
Yes
Yes
FM Radio Problems
START
Perform System Connector Protection Test
If successful continue with the
FM Radio Antenna Problems TRS guide
Is the
FM Radio Problems
TRS guide
done?
Yes
No
Go to
FM Radio Problems
TRS guide
Use
Digital Multimeter Instrument (DMM)
for these measurements
Is
L3300 = Max 1.5 Ohm
SL 5 Replace
L3300
SL 4 Escalate
No
Is
C3306
Short Circuit
SL 5 Replace
C3306
SL 4 Escalate
No
Yes
Is
MP X2405_Pin 2
Connected to the PBA
GND (Shield Can
Fence)
Yes
Replace
X2405
No
Replace
N1300
Yes
Is the
Signal
Ok
SL 5 Replace
V2413
SL 4 Escalate
No
Claim Component
N1300
Yes
Is
L2408 = Max 1 Ohm
Replace
L2408
No
Yes
FM Radio Antenna Problems
SEMC Troubleshooting Manual
25
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