LG VX11000 - Page 90

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LG Electronics Inc.
VX11000
Checking Flow
Checking Flow
Waveform
Waveform
RF_IN fed up with CW signal
in Bypass mode of PAM
Figure 4.2.2.5
RF_OUTRF_IN
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
NO
Replace U1008
YES
NO
YES
whether it is lower than 2.2V.
Check PA_R0 line
NO
YES
NO
YES
Check pin7, 8 at U1008
Check pin3 at U1008(PA _R0 )
whether it is higher than 3.4V.
Check Vcc line
NO
Check pin4, 11 at U1008 (Vcc)
YES
whether it is higher than 2.2V.
Check pin6 at U1008(PA _ON1)
whether it is lower than 2.2V.
Check pin2 at U1008(PA _R1)
Check PA_ON1 line
Check PA_R1 line