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Check pin2(TP1),7(TP2) at U111
Check if there is any major difference referring
To Figure 4.2.2(i) Is it similar?
Check pin4, 12(TP3) at U111 ( Vcc)
whether it is higher than 3.4V.
Check pin4 at U111(PA_ON2 signal)
whether it is higher than 2.2V.
Check pin3(TP4) at U111(PA_R1)
whether it is lower than 2.2V.
Replace U111
RF_IN fed up with CW signal
in low gain mode of PAM
Checking Flow
Checking Flow
YES
YES
YES
YES
Waveform
Waveform
PAM circuit is OK. See next page
YES
Check Vcc line
NO
Check PA_ON line
NO
Check PA_R1 line
NO
RF_OUT
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Table of Contents
Troubleshooting
