4. TROUBLE SHOOTING
- 53 -
(4) Checking SAW Filter Circuit
For the test,
RX Stand alone Mode is
needed. Refer to chapter 11
FL401.3: ~ -64dBm
FL402.3: ~ -64dBm
Check RF Level of
Saw Filter Input
For GSM : FL401.3
For DCS : FL402.3
Saw Filter is OK
See next Page to check
Rx IQ Signal
Saw Filter is OK
See next Page to check
Rx IQ Signal
Yes
No
Check the parts are well
Soldered
For GSM : L501,C513,C518
For DCS : L503, C521,C522
Yes
Soldering is
OK?
No
No
Changing
for GSM
for DCS
Changing
L501,C513,C518 for GSM
L503, C521,C522 for DCS
Changing FL401
for GSM, FL402
for DCS
for DCS
FL401
FL402
L503
6.8nH
C522
1p
1
IN
O1
3
4
O2
EFCH1842TCA7
FL402
2
G1
5
G2
EFCH942MTCA7
FL401
2
G1
5
G2
1
IN
3
O1
4
O2
L501
27nH
1p
C513
1p
C518
C521
1p
Test Points
Checking Flow
Circuit Diagram
Figure 4-5
Summary of Contents for C2100
Page 1: ...Service Manual Model C2100 Service Manual C2100 P N MMBD0048201 Date April 2005 Issue 1 0 ...
Page 76: ...4 TROUBLE SHOOTING 77 4 10 KEY backlight Trouble Test Points Figure 4 21 ...
Page 104: ... 105 8 PCB LAYOUT ...
Page 105: ... 106 8 PCB LAYOUT ...
Page 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 117: ...Note 118 ...
Page 119: ......
Page 135: ......