LG VX8560 Service Manual page 75

VX8560
Check if there is any major difference referring
To Figure 4.2.1.5. Is it similar?
Check pin4, 11 at U106 (Vcc)
whether it is higher than 3.4V.
Check pin5 at U106 (PA _ON0)
whether it is higher than 2.2V.
Check pin3 at U106(PA _RANGE)
whether it is lower than 2.2V.
RF_IN fed up with CW signal
in low gain mode of PAM
LG Electronics Inc.
Checking Flow
Checking Flow
Start
Check pin1, 14 at U106
YES
YES
YES
YES
Replace U106
Waveform
Figure 4.2.1.5
PAM circuit is OK. See next page
YES
NO
NO
NO
Waveform
RF_IN
Check Vcc line
Check PA_ON0 line
Check PA_RANGE
RF_OUT
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