Nokia 8208, Руководство по обслуживанию

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RM-384
RF Troubleshooting
Issue1 Company Confidential Page 4-11
Copyright © 2008 Nokia. All rights reserved.
RF TX voltage checking
Steps
1. Set up the main board in the module jig.
2. Check the following:
# Signal name Test point Voltage (all bands)
1 TX_2.85V U403 2.85V
2 MSMP_2.6V U403 2.6V
3 TX_ON U403,U301 2.6V
4 PA_RXX U403,U301 0V for high gain mode 2.4~2.5V for low gain mode
5 PA_ON0 U403,U301 2.5~2.6V for PA turning on, 0V for turning off (CELL)
6 PA_ON1 U403,U301 2.5~2.6V for PA turning on, 0V for turning off ( PCS)
Table 17 RF TX voltage checking point information
Figure 40 Tx DC checking test points