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4.1.3 Checking VCTCXO Circuit
Test Point
U407. 4
U407. 3
Figure 4-3
Circuit Diagram
Waveform
Graph 4-1(a)
Check U407 Pin 3
◆ Refer to Graph 4-1(a)
U400. 32
CheckU407 Pin 4
◆ Refer to Graph 4-1(b)
Checking Flow
VCTCXO Circuit is Ok
Yes
19.2MHz OK?
See next Page to check
Rx VCO
No
Yes
+2.8V_TCXO OK?
No
Check U400
Graph 4-1(b)
Changing U407
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