Nokia 1508I Manuale utente

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Nokia Customer Care

1508i (RM-430)

Mobile Terminal

RF Description and Troubleshooting

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Contents

1508i RF troubleshooting

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Component Layout

Figure 1 and Figure 2 show the main components of the 1508i mobile terminal.

Figure 1: Component layout (Top)

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Figure 2: Component layout (Bottom)

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Tx Troubleshooting

Tx System Block Diagram

Figure 3: Tx system block diagram

Tx Introduction

The SA9562 is highly integrated direct conversions transmit IC for use in multi-band

(800MHz, 1700MHz and 1900MHz) mobile phones. It can be used in CDMA modes

conforming to the CDMA2000 1xRTT release A in three frequency bands. Fabricated in

QUBiC4 BiCMOS technology, it integrates an IQ modulator, dual Σ∆ Fractional-N

synthesizers, a semi-integrated crystal oscillator, a fully integrated Transmitter VCO, an RF

VGA for CEL and PCS, one PA driver for the US Cellular band (824 to 849MHz) and two PA

drivers for PCS bands (1750MHz to 1780MHz or 1850MHz to 1910MHz). Figure 3 shows the

RF Tx system block diagram

Main Tx Component

cou

ler

Duplexer

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Figure 4: Tx main components

AMS Setup for Tx Troubleshooting

Put PWB on the module jig. Use the following steps to configure AMS for RF troubleshooting.

1. Connect RF connector to a CMU200 or 8960.

2. Connect the PWB to a PC via the Module Jig, and connect a power supply.

3. Open AMS Tools software and select RF Tool.

4. Choose CP Enable, Enable“off”, then send.

5. Choose DSPM AFC Config. Set Pdm Val “0x0200”, then send

6. Choose CP PLL Channel Config. Set Band “PCS”, Channel “600”, then send..

7. Choose CP TX CDMA Test send.

8. Choose DSPM TX AGC Config. Set Hyst State “High gain”, Power (dBm) “24dBm” then send.

9. Choose CP AUX ADC Get. Set TX PCG Sync “off” then send to get Power detector ADC value.

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Figure 5: FTM dialog box (Picture will be updated )

Tx DC Test Points

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Figure 6: Tx DC test point

Table 1 shows the Tx DC test points shown in Figure 6.

Test Point Description Value

1 PA_R1 2.16V for high gain mode,1.6V for low gain mode

2 PA_ON 3.08V for PA turning on, 0V for turning off

3 Tx_on 2.0 V

4 Tx_pll 3.0V

5 Tx_VccIQmod 3.0V

6 TX_AGC 1.92V for 5dBm, 2.16V for 15dBm, 2.4V for 25dBm.

7 Tx IQ in 0.8 V With oscilloscope: 500 mV p-p

8 Tx_vccRFVGA 3.0V

Table 1: Tx DC Test Points

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Tx RF Test Points

Figure 7: Tx RF Test Points

Table 2 shows the test points shown in Figure 7.

Test Point Description Value

1 LO in About 0dBm

2 RFout About 2dBm

3 PA input About 0dBm

4 PA output About 28dBm

5 Coupler output About 26dBm

6 Connector About 24dBm

Table 2: Tx RF Test Points

1508i(RM-430)

RF Description and Troubleshooting

NokiaCustomerCare

Issue 1

Tx Path Troubleshooting

No No No

yes

No No

yes

Notes:

• CBP5.6 is underfilled and can not be replaced.

• The shield case can not be reused after removal.

• After using the heatgun, the domesheet needs to be replaced

• U109 is PA, it is need special tool to reheat it.

Tx path faults

Measure DC test points

at table 1,is it OK?

Measure Tx RF test point

2 at table 2, is it OK?

Measure Tx RF test point

3 at table 2, is it OK?

Measure Tx RF test point

4 at table 2, is it OK?

Measure Tx RF test point

5 at table 2, is it OK?

If RF antenna feed point pad

obstructed, clean the pad,

connect system simulator to the

MS antenna, is it OK?

Tx troubleshootin

finished

Check ACT5805,

CBP5.6

Reheat solder joints of

ACT5805

Measure Tx RF test point

1 at table 2, is it OK? Rehear solder joints of c244

Reheat L205 and reheat SA9562

Reheat the solder joints of C101,D201

Reheat the solder joints of U109 Chan

e U109

Reheat the solder

oints of C113, U101

Measure Tx RF test point

6 at table 2, is it OK? Reheat the solder

oints of R107, U107

Reheat the solder joints of L123, C120

Check antenna module

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