Self Test Failure; Oscillator Failure; Cw Test Failure; Gps Rf Troubleshooting - Nokia 6255 Rf Description And Troubleshooting

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5. In the Test Mode field, ensure that Galvanic is selected.
6. Click Execute.

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" on page 66 for test point locations and values.)
2. Inspect all GPS circuit elements around the GPS BB chip (N6200).
3. If the elements pass a visual inspection, replace the N6200.

Oscillator Failure

1. Inspect all GPS circuit elements around the GPS RF chip (N6250).
2. If the elements pass a visual inspection, replace the GPS TCXO (B6250).

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 69.
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.
Issue 2 05/2005
©2005 Nokia Corporation
6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting
Company Confidential Page 65