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3. TROUBLE SHOOTING
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3.2.2.3 Checking B5 TX PA
START
No
No
No
Replace U1602
Yes
Yes
Yes
Check TP1(C1643) at U1602
Check if there is any major difference referring
To Figure 3.2.1.4 Is it similar ?
Check TP2(1655)at U1602
Check if there is any major difference referring
To Figure 3.2.1.4 Is it similar ?
Check TP3(C2034) at U1602 (VPWR)
Whether it is higher than 1.5V
Check C1644
PAM circuits OK, See next page
The Problem may be Logic part
Refer to Logic troubleshoot