User Guide

Nokia Customer Care RF Description and Troubleshooting
6235/6235i/6236i (RM-60)
Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 63
Self Test Failure
If the test fails, repeat steps 1—6. If the test fails again, continue with the following self-
test failure troubleshooting:
1. Verify the DC voltages at VRF_GPS and VIO_GPS. ("GPS DC Test
Points"onpage64 for test point locations and values.)
2. Inspect all GPS circuit elements around the GPS BB chip (D6200).
3. If the elements pass a visual inspection, replace the D6200.
Oscillator Failure
1. Inspect all GPS circuit elements around the GPS RF chip (N6251).
2. If the elements pass a visual inspection, replace the GPS TCXO (N6250).
CW Test Failure
1. Check that the signal generator is on and sourcing a signal to the GPS RF input
port (X6250).
2. Inspect all GPS RF circuit elements.
3. Probe the GPS RF test points on page 65.
4. If the elements pass a visual inspection and the RF is good, replace the GPS RF IC
(N6250).
GPS RF Troubleshooting
Use the following steps to trouble shoot the GPS receiver.
1. On the GPS Control dialog box, select On.
2. Click Execute.
Figure 64: Turning on the GPS receiver on the GPS Control dialog box