2.2.2 Check VCTCXO Circuit
TEST POINT
Circuit Diagram
Waveform
Checking Flow
Pin 3
19.2MHz OK?
VCTCXO Circuit is OK
See next page to check
SBI control signal
YES
NO
Pin4
2.8V OK?
Replace X100
NO
Check U400
X100
YES
X100 Pin4
(+2.8V_TCXO)
X100 Pin3
(MSM_VCTCXO_OUT)
X100 Pin3 VCTCXO_OUT
X100 Pin4 +2.85V_TCXO
22
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Summary of Contents for LG-MC2670
Page 17: ...LG MC26 70 DCN Mode Graph 2 1 2 1763 04MHz DCN384 14 Z 3 X B O X C O M ...
Page 21: ...LG MC2670 Waveform DP101 Pin 5 Graph 2 1 4 c DP101 Pin 8 Graph 2 1 4 b 18 Z 3 X B O X C O M ...
Page 32: ...LG MC2670 Circuit Diagram 29 Z 3 X B O X C O M ...
Page 55: ...LG MC2670 Appendix Z 3 X B O X C O M ...
Page 56: ...Z 3 X B O X C O M ...
Page 58: ...Z 3 X B O X C O M TX Line RX Line Local Line RD2670 ...
Page 59: ...Z 3 X B O X C O M TX Line RX Line MIC Line SPK Line RD2670 ...
Page 60: ...Z 3 X B O X C O M RD2670 ...
Page 61: ...Z 3 X B O X C O M SPK Line MIC Line RD2670 ...
Page 65: ...Description LG Part No Q ty MAIN PCB SPFY0083001 1 2 PCB Z 3 X B O X C O M ...