Nokia 6310i Mather Board

Measurements should be done using Spectrum Analyzer with high-frequency high-impedance passive probe (LO-/reference frequencies and RF-power levels) and Oscilloscope with a 10:1 probe (DC-voltages and low frequency signals).

The RF-section is build around one ASICS Hagar (N600). For easier troubleshooting, this RF troubleshooting document is divided into sections.

Before changing Hagar, please check the following things: Supply voltages are OK and serial communication are coming to Hagar (See Baseband troubleshooting document).

Please note that the grounding of the PA-module is directly below PA-module so it is difficult to check or change. Most RF semiconductors are static discharge sensitive!

So ESD protection must be taken during repair (ground straps and ESD soldering irons). The Hagar IC is moisture sensitive so parts must be pre-baked prior to soldering.

Apart from key-components described in this document here are a lot of discrete components (resistors, inductors and capacitors) which troubleshooting is done by checking if soldering of the component is done properly, for factory repairs (checking if it is missing from PCB). Capacitors can be checked for shortening and resistors for value by means of an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.

Please be aware that all measured voltages or RF levels in this document are rough figures. Especially RF levels varies due to different measuring equipment or different grounding of the used probe.

All tuning must be done with Phoenix Service Software, version 02.90.001, or later.

RF Key component placement

Reference number

Name

Reference number

Name

N600

HAGAR RF IC

X802

RF Connector

N840

PA

L836

Directional Coupler

Z610

PCN RX SAW filter

V830

Detector Diode

Z620

EGSM RX SAW filter

X101

Battery Terminal V+

Z650

EGSM TX SAW filter

X102

Battery Terminal V-

Z804

RX DUAL SAW filter

G630

VCO

Z802

RXTX Switch Module

G740

VCTCXO

T660

PCN TX Balun

T630

VCO Balun

V810

PCN RX LNA

C840

Supply Capacitor

V820

EGSM RX LNA

V130

Bluetooth Module

X800

Antenna signal clip

A002

HAGAR RF Can

X801

Antenna ground clip

A003

PA Can

RF Measurement points PA Can

Connector

Measurement points are shown on the picture below inside the circles.

PA DUAL SAW DUAL SAW VBD PA EGSM out PCN out PCN in EGSM PCN in VANT1 VANT2 LNAB 900

PA DUAL SAW DUAL SAW VBD PA EGSM out PCN out PCN in EGSM PCN in VANT1 VANT2 LNAB 900

Nokia 6310i Replacement Power

V810 RF out

LNAB_ 1800

VTXB_900 TX 900

TX 1800 VTXB 1800

V820 RF out

LNAC_900 V820 RF in DUAL SAW EGSM out

DUAL SAW PCN out

V810 RF in

V810 RF out

LNAB_ 1800

VTXB_900 TX 900

TX 1800 VTXB 1800

Hagar RF can

Measurement points are shown circled on the picture below.

TX_900 TX_1800 Z620 input

LNAC 1800

RXIINP

RXQINP

.TXQOUT

P/N VREFRF01

VCO out

Bluetooth VCTCXO supply VCTCXO out VR3 VCO supply Clockbuffer output

Abbreviations in fault finding charts

BB Baseband

DC Direct Current

EGSM Extended GSM (See section 9.6.1 for frequency range)

ESD Electro Static Dicharge f: Frequency of signal (measured with Spectrum Analyzer) GPRS General Packed Radio Service

HSCSD High Speed Circuit Switched Data

LO Local Oscillator

P: Power of signal in decibels (dB) (measured with Spectrum Analyzer)

PA Power Amplifier

PCB Printed Circuit Board

PCN GSM1800 (See section 9.6.2 for frequency range)

PLL Phase Locked Loop

RF Radio Frequency

RX Receiver

T: Time between pulses

TX Transmitter

UHF Ultra High Frequency

V: Voltage of signal (measured with oscilloscope)

VCO Voltage controlled oscillator

VHF Very High Frequency

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