C903
1228-1147 rev. 1
TROUBLESHOOTING
FM Radio Problems
T
R
O
UBL
ESHOOT
ING
- FM Radio Antenna Problems
START
1:
Load ETS 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
Frequency:
103 MHz
Set Fm Radio
FM Radio
Is
not
working both with
Loudspeaker and
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 7
(C3145) and MP 6
(C3146)
Is there
any signal on
MP 7 (C3145) and
MP 6 (C3146)
No
Yes
SL 5 Replace
N2000
SL 4 Escalate
Signal Generator
Instrument Settings:
Change Amplitude/Level to:
800
μ
V
Go to
FM Radio Antenna
Problems TRS guide
Yes
Is any of
C3145 or C3146
Short circuit
No
SL 5 Replace
C3145 or C3146
SL 4 Escalate
Yes
1.8 Volt DC
at MP 10 (R3302
FM_INT)
No
SL 4 Replace
N1300
SL 5 Replace
N2010
No
Yes
Replace
N1300
FM Radio Problems
START
Is the
FM Radio Problems
TRS guide
done?
Yes
No
Go to
FM Radio Problems
TRS guide
Use the
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 9
(X2405_Pin 2)
Connected to
GND
Yes
SL 5 Replace
X2405
SL 4 Escalate
No
Replace
N1300
Yes
Is the
Signal
Ok
Replace
V2413
No
Claim Component
N1300
Yes
Is L2408
= Max 1 Ohm
Replace
L2408
No
Yes
FM Radio Antenna Problems
SEMC Troubleshooting Manual
27
(129)
