Philips CT6558 Guida rapida

Revision : 01

PHILIPS Date :2004-9-7

Tuning Up procedure & Operational Manual Page No. : Page 1 of 1

CONTENT

1.0 Objective

This document outlines the trouble shooting for the CT6558.

2.0 Scope

1. Used for radio trouble shooting in factory.

2. Used for radio trouble shooting in customer service.

3.0 Definition of terms

Nil

4.0 Responsibility

Nil

5.0 Detail procedure

5.1 General description………………………………………………………………….

5.11 Product Overview…………………………………………………………….

5.12 Product technical parameters ………………………………………………

5.2 CT6558 Signal Flow Overview………………………………………………..

5.21 Receiver Principle and troubleshooting……………………………………..

5.22 Transmitter Principle and troubleshooting…………………………………..

5.23 Logic circuit Principle and troubleshooting…………………………………

5.3 Exploded view and figures…………………………………………………………...

6.0 Referrence

6.1 CPU (OM6357-7)…………………………………………………………………..

6.2 PMU (PCF50603)…………………………………………………………………..

6.3 Tranceiver (UAA3537HN)………………………………………………………….

6.4 PA&PAC IC (SKY77324)…………………………………………………………..

6.5 CAMERA IC (BU1594GS)…………………………………………………………

6.6 MEMORY (M36L0R7050T0ZAQT/STM)………………………………………...

6.7 MELODY IC (ML2864)…………………………………………………………….

6.8 CHARGE IC (UBA2008)……………………………………………………………

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PHILIPS Date :2004-9-7

Tuning Up procedure & Operational Manual Page No. : Page 2 of 2

5.1 General description

5.11 Product overview:

CT6558 product is new model phone designed by CECW, it works at Tri-band, EGSM、DCS and PCS band

its weight is only 85g, the size is 85x45x24 CT6558 is a more powerful product, with 300,000 pixels camera

sensor inside, 65k colors CSTN main display which pixels is 128*160,sub-display is STN screen, and has 64

polyphonies, and has hand free function.

CT6558 CPU runs at 13MHz, with 128M Flash Memory and 32M SRAM. The main IC include CPU

（OM6357EL/3C5/7）、FLASH(M36L0R7050T0ZAQT /STM)、PMU(PCF50603)、Transceiver(UAA3537HN)、

PA(SKY77324), CT6558 can dial 4 hours continuously and can be in idle mode up to 400hours ,using 600Mah

LI battery.

5.1.2 Product technical parameters:

GENERAL:

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PHILIPS Date :2004-9-7

Tuning Up procedure & Operational Manual Page No. : Page 3 of 3

item EGSM(GSM) DCS PCS

Frequency

allocation

TX（Uplink）

:880MHZ-915MHZ

RX（Downlink）

:925MHZ-960MHZ

TX（Uplink）

:1710MHZ-1785MHZ

RX（Downlink）：

1805MHZ-1880MHZ

TX（Uplink）：

1850MHZ-1910MHZ

RX（Downlink）：

1930MHZ-1990MHZ

Channel

band width 200KHz 200KHz 200KHz

Channel 975-1023,0-124 512-885 512-810

Modulation GMSK,BT=0.3 GMSK,BT=0.3 GMSK,BT=0.3

TX/RX

channel

space 45MHz 95MHz 80MHz

(Fn)Freq.

calculating

formula

GSM

Fn=890.2+(N-1)*0.2

EGSM

Fn=880.2+(N-975)*0.2

N: Channel No. Unit: MHz

Fn=1710.2+(N-512)*0.2

Unit: MHz

Fn=1850.2+(N-512)*0.2

Unit: MHz

5.2 CT6558 Signal Flow Overview:

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PHILIPS Date :2004-9-7

Tuning Up procedure & Operational Manual Page No. : Page 5 of 5

RF Connector

RF Switch

PA&PAC

Bat. Conn.

IO Conn.

PMU

Charger IC

SIM Conn.

Memory

IRDA

CPU

MIDI IC

26M oscillator

Backup Battery

Tranceiver

SAW Filter

LCD conn.

32K oscillator

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PHILIPS Date :2004-9-7

Tuning Up procedure & Operational Manual Page No. : Page 6 of 6

5.2.1 Receiver principle and troubleshooting

CT6558 RX signal flow chart(Figure 1)：

Antenna 7010 7130

Hall IC

Blue backlight

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Tuning Up procedure & Operational Manual Page No. : Page 7 of 7

EGSM SAW Filter

RF CONN RF_SW PCS SAW Filter Tranceiver

DCS SAW Filter

I&Q

Receiver CPU

7300

Figure 1

1.CT6558 downlink signal flow fromAntenna to RF-Connector：

The aerial signal mobile phone received go from antenna to RF Connector。RF Connector, which is a

special parts developed for RF test. By connecting U501 and RF cable to spectrum analyzer, you can

measure the signal.

2. Signal output from RF Connector will be input to RF_SW。Tranceiver control FSW1、FSW2、FSW3

signals, which will be in charge of RF_SW in relative Band(EGSM、

DCS、

PCS)，

and in TX/RX status.。

From Antenna

RF-Connector

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Tuning Up procedure & Operational Manual Page No. : Page 8 of 8

Following is the relative controlling signal status :

3. The RX signal output from RF_SW, flowing to relative SAW Filter, then go through Balun circuit ,

input to tranceiver.

SAW Filter

RF Switch

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Tuning Up procedure & Operational Manual Page No. : Page 9 of 9

For example:(EGAM, 925-960Mhz)

SAWFilter(EGSM)

4. 7130 is the main IC in RF circuit, which response for signal modulation and demodulation. Signal

input in 7130 after pass BPF, Signal pass LNA, then mix with local signal (RF-VCO) get the -100Khz

signal. After pass the filter, output (IA IB QA QB) IQ signal. RF-VCO is fully integrated inside 7130.

EGSM

PCS

DCS

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Tuning Up procedure & Operational Manual Page No. : Page 10 of 10

The receiver consists of two distinct parts, the RF receiver front-end and IF section. The RF

front-end amplifies the EGSM/DCS/PCS aerial signal, converts the chosen channel down to a low IF of

–100kHz,and provides in addition more than 35dB image suppression. Fout LNAs are available on chip

and can be configured to allow 3 bands(low, high and switched).The switched LNA will be used for

roaming in different countries. some selectivity is provided at this stage by an on-chip low-pass filter,chan

channel selectivity is provided by means of a high performance integrated band-pass filter. The IF section

further amplifies the wanted channel, performs gain control to tune the output level to the desired value

and rejects DC.

5.Four IQ signals input to CPU , go through A/D ,DSP, and D/A section in CPU , then output to receiver.

LNA IQ Down mixer Channel Filter

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