Philips CT6558 Quick start guide

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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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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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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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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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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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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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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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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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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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Trouble shooting to receiver circuit
1．We separate the failures in 3 parts: Logic failure, receiver failure and transmission failure. First we need define the
failure according to the failed item then we begin the analysis in detail.
2. Receiver key parameters include: RX LEVEL、RX QUALITY、MOBILE CALL、FLATNESS、TIME MASK、PHASE
ERROR、FREQUENCY ERROR, etc.
2.1 Confirm the analyzer station has been set up：
a .Setup the right work condition of Agilent8960：Band: EGSM; Channel,Altitude of transmitter of the BS.
b. Power on radio, Connect the RF cable from 8960 to radio, setup right channel no. and RX altitude of debug
tool, same as 8960.
C. then using debug tool in RX mode, press ‘measure’ button to check whether the received signal is same as
input signal.
Test signal on a good radio to get reference signal when you don’t know if the signal is right
Step1:Measure the received signal according to signal flowing chart.
Measure the signal with spectrum analyzer on 2001 to check if the input signal is right. If wrong signal was
detected it maybe U501 cold sold or part defect.
Measure the signal on pin12 of 7010 to check if the input signal is right. If wrong signal was detected it
maybe 2001 cold soldering, tombstone part, part missing or screwed part.
CPU
Receiver

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Step2: Measure the output signal from 7010 to check if the signal is right, EGSM signal: measured from pin 7
(Measure at 2011); DCS signal: measured from pin5 (at 2015), and for PCS at 2014. If the signal is not right, should
check if 7010 cold soldering, soldering short part, part defect or un-soldering. If no defect was found at 7010, then check
if the control signal “FSW1, FSW2,FSW3” is right. If the signal is not right please check 7130 and parts around them. If
no clear issue found, change 7010,7130, one by one
RF Connector
Connect to Antenna
RF Switch
SAW Filter
Tranceiver

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Step3: Measure the input signal and output signal of BPF. If the input signal is wrong, check on 2011: EGSM and
2015: DCS, 2014:PCS. If the output signal is wrong , check the filter 5010：EGSM，5014：DCS, 5012:PCS: 2014
Step4: Measure I/Q signal output from 7130. If the signal is not good, check if there are defects on
7130. Also need check the working voltage of 7130.
Step5: Measure I/Q Signal input to CPU, Otherwise change 7300.
5.2.2 Transmitter principle and troubleshooting:
Transmitter circuit signal flowing chart:
7010
U501 DCS_PCS
Antenna RFCONN RF_SW 7011
EGSM
7300 EGSM
CPU 7130
I&Q DCS_PCS
MIC
PA
&
Power Control Loop
Balun
Balun

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1. Micphone to CPU (7300):
Audio signal input from Micphone , Micphone convert the voice signal to analog signal and input
to CPU (7300).
2.After A/D, convert analog signal to logic signal in CPU. Then send the logic signal to DSP passASI.
Then processed logic signal pass D/A converter divided into four signals (IQ), output from CPU (7300)
to 7130, QRX-TX-P, QRX-TX-N, IRX-TX-P, IRX-TX-N .
CPU

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2. Then the I/Q signal modulate in 7130. The transmitter is fully differential using a direct-up conversion architecture.
It consists of a single side band power up mixer. The fully-integrated VCO and the power mixer are designed to achieve
LO suppression, quadrature phase error, quadrature amplitude balance and low noise floor specifications.
3.Output Signal from tranceiver will pass by Balun circuit, then flow to PA&PAC IC.

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4.TX signal flow through balun circuit, then input to PA&PAC IC.
5. Tx signals output from PA, flow through RF-SW, RF-Connector to antenna.
Balun Circuit
PA&PAC IC
GSM
DCS/PCS
GSM
DCS/PCS

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TX circuit troubleshooting:
Key parameter of Tx circuit is “Freq. error”, “MAX POWER”, “TX-CURRENT”, “PA table”, etc.
Following is normal analysis of the circuit, according to failed item to do more analysis.
Confirm the instrument for analysis is good:
a. Power on radio, press ‘Tx command’button, setting up the channel and power level.
b. Set the right frequency and sweeping time on spectrum analyzer.
c. Set up the voltmeter and oscilloscope.
Step1: Measure the I/Q signal from CPU (7300) to modulation and demodulation IC (7130). If the I/Q signal is not good,
check CPU.
Step2: if I/Q signal is good, Measure the output signal of 7130, If the signal is not good, check 7130, and parts
around 7130.
Step3: If the signal output from 7130 is right, continue to measure the TX signal at Balun circuit, and check balun
Circuit parts around.
Step4:If the output signal from Balun circuit is good , continue to check output signal of PA. Measure the EGSM
signal at pin12 of PA; Measure DCS signal at pin17 of PA. If the output signal is not good check PA or parts around PA.
Check the operating voltage “VBAT” and control signal.
RF-Switch

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Step5: Measure the input signal and output signal of RF-SWITCH (7010).Also need check and control signal of 7010 .
Measure antenna at last. CheckU501,Antenna, if the signal is not good.
5.2.3 Logic circuit principle and troubleshooting：
radio can’t turn on
1. the turning on process introduction :
A. First power on radio, then after getting V_BAT, PMU will generate V_ISUP(2.7V),
7400 32.768K oscillator begin to run. ONKEY_N output 2.3V.
If radio is connected with I/O CABLE, when DownLoad software into radio, PC Sever will be ready.
B. Pressing ON_KEY, about 14ms later, PMU will generate VDD1,VDD2, VDD3,AVDD,VCC_SYN.and
VDD1,VDD2 ,AVDD is supplied to CPU, V-MEM is supplied to Memory, VCC_SYN is supplied to
7130.
7130 will generate VCCREF which will be used for 1060(oscillator). After 9 CLK32 period(one CLK32
period is about 30uS),1060 will generate stable 26M clock signal, which will be divided by 2 inside
7130 ,and output REF_13M supplied to CPU.
C. After 32 CLK32 period when already generated stable 26M clock, the ON/OFF CONTROL module
in PMU will generate RESTO_N signal, which will flow to CPU ,and reset CPU.
Tranceiver
PA&PAC ICRF Switch
RF connector

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D. After resetting CPU, the basic turning on information read from ROM inside will be sent out by TXD0
pin, these codes will be sent to connector, if connector is connected with PC Sever by I/O CABLE, PC
Sever will send back a reply code by RXD0 pin to CPU, Radio hand in PC successfully. Then begin to
download ‘.fdl’ file into Flash.
E. If connector is not connected with PC by I/O CABLE, no reply code feedback, CPU will run , open
Bus, send out Chip-select signal, then run ‘.fdl’ file in Flash, open backlight, display etc, enter normal
mode.
2. Trouble shooting :Radio cannot power on:
A.
a. Power the radio measure “VBAT”. If the voltage is not correct check battery or power supply.
b. Check the battery connector or interface connector.
c. Check the base band power supply and RF power supply provide by 7400. if not correct change 7400.
d. Check if 32Khz oscillator work. If not work change oscillator.
e. Check if 26M oscillator work. If it doesn’t work, change 26M oscillator. Also need check the parts around it;
f. Check PMU, Memory, CPU, tranceiver, otherwise change them.
Vibration issue:
Check if the vibrator is good.
Check if there are assembly issues.
Check if the motor connector, has problem.
Check relative parts.
No key function:
Check metal dome, otherwise change it.
Check side key, whether there is soldering issue.
Check whether it’s PCB issue.
Check CPU IC whether CS,US, otherwise change it.

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No hand free function:
Check the soldering issue of component.
Check Audio PA 7200,whether CS,US CD.
Check Speaker, LCD FPC, otherwise change them.
Mic has no function:
Check the assembly of Mic. Avoid assembly issue.
Check the signal at contact point to the Mic.
If the signal is not correct check the part in the circuit.
Check the signal “MIC-BIAS”. If it’s not correct, change 7400.
Otherwise change MIC, U503 in turns.