Nokia 8208 Service Manual page 99

RM-384
RF Troubleshooting
RF TX voltage checking
Steps
1. Set up the main board in the module jig.
2. Check the following:
# Signal name
1 TX_2.85V
2 MSMP_2.6V
3 TX_ON
4 PA_RXX
5 PA_ON0
6 PA_ON1
Issue1
Test point
U403
U403
U403,U301
U403,U301
U403,U301
U403,U301
Table 17 RF TX voltage checking point information
Figure 40 Tx DC checking test points
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Voltage (all bands)
2.85V
2.6V
2.6V
0V for high gain mode 2.4~2.5V for low gain mode
2.5~2.6V for PA turning on, 0V for turning off (CELL)
2.5~2.6V for PA turning on, 0V for turning off ( PCS)
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