Nokia 8208, Service Manual, Page: 104 / 170

RM-384
RF Troubleshooting
Page 4-16 Company Confidential Issue1
Copyright © 2008 Nokia. All rights reserved.
Receiver Check from RF to DVGA
Cellular band
Unit: dBm
DVGA LNA 0 LNA 1 LNA 2 LNA 3
Input RF -90 -90 -70 -50 -30
Range 1700 ~4500 50 ~ 175 110 ~ 310 280 ~ 440 430 ~ 650
Table 20 Receiver check from RF to DVGA (Cellular band)
PCS band
Unit: dBm
DVGA LNA 1 LNA 2 LNA 3
Input RF -90 -90 -50 -40
Range 1900 ~ 4000 120 ~ 270 310 ~ 430 455 ~ 600
Table 21 Receiver check from RF to DVGA (PCS band)
RF RX voltage checking
Steps
1. Set up the main board in the module jig. The phone should be in FTM mode.
2. Check the following:
Test
Point
Description Value Check component
1 RX_2.85V 2.85V U403,U205
2 RX_2.85V 2.85V U403,U205
3 RX_2.85V 2.85V U403,U205
4 MSMP_2.6V 2.6V U403,U205
5 RX_2.85V 2.85V U403,U205
6 CELL0_LNA_BIAS 0.8V U205
Table 22 shows the Tx DC test points shown in Figure 43