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3.2.2 Check VCTCXO Circuit
TEST POINT
Checking Flow
U101
YES
Pin 3
VCTCXO Circuit is OK
19.2MHz OK?
See next page to check
SBI control signal
NO
U101 Pin3
VCTCXO OUT
YES
Pin4
Replace U101
2.85V OK?
NO
U101 Pin4
Check U401
2.85V_TCXO
Circuit Diagram
Waveform
U101 Pin4 2.85V_TCXO
U101 Pin3 VCTCXO_OUT
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