LG VX8560 - Page 89

LG Electronics Inc.
VX8560
RF_OUT
Checking Flow
Checking Flow
RF_IN fed up with CW signal
in low gain mode of PAM
Waveform
Waveform
Figure 4.2.2.5
Check if there is any major difference referring
To Figure 4.2.2.5. Is it similar?
Start
PAM circuit is OK. See next page
YES
Replace U106
YES
whether it is higher than 3.4V.
Check Vcc line
NO
YES
whether it is lower than 2.2V.
Check PA_RANGE
NO
YES
whether it is higher than 2.2V.
Check PA_ON1 line
NO
YES
Check pin7, 8 at U106
Check pin4, 11 at U106 (Vcc)
Check pin3 at U106(PA _RANGE)
Check pin6 at U106 (PA _ON1)
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