Nokia RH-27 Series Bedienungsanleitung

CCS Technical Documentation

RH-27 Series Transceivers

Troubleshooting - GPS

RH-27

Troubleshooting - GPS CCS Technical Documentation

Contents Page No

Troubleshooting - Global Positioning System (GPS) Engine........................................ 3

GPS General Block Diagram .......................................................................................3

GPS RF Schematic ......................................................................................................3

GPS Testing .................................................................................................................4

GPS RF Probing Setup ................................................................................................7

GPS RF Probing Measurements................................................................................ 8

CCS Technical Documentation Troubleshooting - GPS

RH-27

Troubleshooting - Global Positioning System (GPS) Engine

The RH-27 handset supports 800 Amps and 800 CDMA / 1900 CDMA + GPS with IS 2000

capability. The RH-27 engine supports CDMA and GPS functionality for Enhanced 911

(E911) services.

GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to

determine latitude and longitude of the handset. The GPS circuitry and the cellular

engine (CE) circuitry are completely separate in the handset. The GPS circuitry is located

almost exclusively on the secondary side of the PWB, underneath the display module.

GPS General Block Diagram

GPS RF Schematic

ADC

Synthesiser

TRF5101

LNA

FilterFilter

AGC

Amp

Xtal

16.368MHz

IF = 4.092MHz

Ref Clk

Rx Data

Out

GPS

Baseband

Cellular Baseband

GPS RF

F Input

Filter 1 (Z001)

Filter 2 (Z002)

GPS RF Chip (N001)

Circuits located on Bottom Layer Circuits located on Top Layer

RH-27

Troubleshooting - GPS CCS Technical Documentation

GPS Testing

1 Set Local Mode.

2 Inject -110dBm tone @ 1575.52MHz at GPS connector (X001) with signal gener-

ator or call box.

3 Open “GPS Control” from the “BB/Hwd” drop-down menu.

Signal Generator

RF OUT

Signal Generator

RF OUT

4. Execute the GPS Quick Test.

5. Analyze Results: See next figures.

CCS Technical Documentation Troubleshooting - GPS

RH-27

5a. Self-Test Failure:

• Repeat Steps 1-5 for first failure. If the test still fails, continue.

• Inspect all GPS circuit elements around D051.

• If pass visual inspection, then replace D051.

5b. Oscillator Failure:

• Inspect all GPS circuit elements around D051.

• If pass visual inspection, then replace B002.

5c. CW Test Failure:

• Check that signal generator is on and sourcing a signal to the GPS RF input port (X001).

• Inspect all GPS RF circuit elements.

• Inspect all GPS circuit elements around D051.

• If all visual inspection looks good, then replace GPS RF IC (N001).

Top Layer

D051

B002

RH-27

Troubleshooting - GPS CCS Technical Documentation

INSPECT!

CCS Technical Documentation Troubleshooting - GPS

RH-27

GPS RF Probing Setup

1 Turn on the GPS Receiver

2 Inject -25dBm tone @ 1575.52MHz at GPS Connector (X001) with signal gener-

ator or Call Box.

3 Continue to the GPS RF Probing Diagram diagram which follows, and measure

probe points with either a FET probe and a spectrum analyzer set at center fre-

quency 1575.25MHz, Span = 500kHz, or a voltmeter as specified.

Signal Generator

RF OUT

Signal Generator

RF OUT

RH-27

Troubleshooting - GPS CCS Technical Documentation

GPS RF Probing Measurements

PT Description Value Instrument

LNA output 1575.25MHz @ -19.5dBm spectrum analyzer

2nd BPF output 1575.25MHz @ -21dBm spectrum analyzer

TXCO supply VRF_GPS 2.78V (DC) voltmeter

TXCO output freq 16.368MHz @ +6dBm spectrum analyzer

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