2.1.4 Checking Rx VCO Signal
Test Point
Checking Flow
Check U106 Pin 18
Check if there is
Any Major Difference
◆
Refer to Graph 4-2
Check U106 Pin 16
Check if the voltage is
around 1.5V
UHF_LO OK?
CP_RX OK?
No
Yes
Yes
No
Rx VCO is Ok
See next Page
to check Control Signal
Check U105
Figure 2.1.4
Rx TEST SETUP(HHP)
- Test Channel : 384(DCN)
Spectrum Analyzer Setting
Oscilloscope Setting
U106.18 (UHF_LO_OUT)
U106.16 (CP_RX)
Replace U106
13
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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 ...