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4. TROUBLE SHOOTING
(4) Checking SAW Filter Circuit
Test Points
FL401
FL402
Soldering chec k
Figure 4-6
Checking Flow
Check RF Level of
Saw Filter Input
For GSM : FL401.3
For DCS : FL402.3
For the test,
RX Stand alone Mode is
needed. Refer to chapter
FL401
FL402
No
FL401.3: ~ -64dBm
FL402.3: ~ -64dBm
Yes
Saw Filter is OK
Saw Filter is OK
See next Page to check
Rx IQ Signal
Check the parts are well Soldered
For GSM : L501,C523,C525
For DCS : L503, C526,C529
- 58 -
Circuit Diagram
C523
3
2
G1
O1
1
IN
FL401
G2
O2
EFCH942MTCA7
5
4
C525
C526
3
2
G1
O1
1
IN
FL402
G2
O2
EFCH1842TCA7
5
4
C529
Soldering is
OK?
No
No
Change
L501,C523,C525 for GSM
L503, C526,C529 for DCS
1p
L501
27nH
1p
1p
L503
6.8nH
1p
Change
Yes
FL401 for GSM
FL402 for DCS
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