Nokia 1508i, RM-430 RF Description and Troubleshooting

1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Nokia Customer Care

1508i (RM-430)

Mobile Terminal

RF Description and Troubleshooting

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Contents

1508i RF troubleshooting

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Component Layout

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

Figure 1: Component layout (Top)

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Figure 2: Component layout (Bottom)

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Tx Troubleshooting

Tx System Block Diagram

Duplexer

coupler

Rx

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

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

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.

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Tx DC Test Points

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

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

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

7

8

TX_AGC 1.92V for 5dBm, 2.16V for 15dBm, 2.4V for 25dBm. Tx IQ in

Tx_vccRFVGA

0.8 V With oscilloscope: 500 mV p-p

3.0V

Table 1: Tx DC Test Points

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

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

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Tx Path Troubleshooting

Tx path faults

Measure DC test points at table 1,is it OK?

No No No

Check ACT5805, CBP5.6

Reheat solder joints of ACT5805

yes

No

Measure Tx RF test point 1 at table 2, is it OK?

yes

No

Measure Tx RF test point 2 at table 2, is it OK?

Rehear solder joints of c244

Reheat L205 and reheat SA9562

yes

Measure Tx RF test point 3 at table 2, is it OK?

Reheat the solder joints of C101,D201

No

yes

Measure Tx RF test point

No No

4 at table 2, is it OK?

Reheat the solder joints of U109

Change U109

No

Measure Tx RF test point 5 at table 2, is it OK?

yes

Reheat the solder joints of C113, U101

yes

Measure Tx RF test point 6 at table 2, is it OK?

yes

No

Reheat the solder joints of R107, U107

If RF antenna feed point pad obstructed, clean the pad, connect system simulator to the MS antenna, is it OK?

yes

Reheat the solder joints of L123, C120 Check antenna module

No

Tx troubleshooting finished

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.

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1508i(RM-430)

p

x

RF Description and Troubleshooting Nokia Customer Care

Rx Troubleshooting

Rx System Block Diagram

er le

Du

Tx

Figure 9: Rx DC troubleshooting test points

Rx Introduction

The SA9522 is a highly integrated receiver IC based on direct down-conversion (Zero IF) radio architecture. It can be used in CDMA mode, compliant to the CDMA standards in Band Class 0 (cellular band) Band Class 1 (US PCS band).And Class 4 (Korean PCS band) also supports GPS functionality. Due to ZIF architecture of the radio IC the mobile phone design requires less external passive components and PCB area. It is fabricated using Philips advanced QuBiC4 BiCMOS technology.

AMS Setup for Rx Troubleshooting

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

1. Connect RF connector to 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 DSPM Rfc Dagc Set Gain State. Set DAgc Enabled “Disable”, DAgc Gain State “Gain5”

8. Set the CMU or 8960 at 600 channel, The level set to -96dBm.

9. Choose DSPM Rfc RXTX send which will return the Received Power.

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Figure 10: AMS dialog box

PCS Receiver Check from RF to IQ

When the AMS is ready for PCS RX troubleshooting, If the received power of the DSPM Rfc RXTX is not close to the signal generator which means that there is a problem in the RX line. First, test the DC points of the RX DC supply lines according to Table3. Then test the RF trace.

1. Inject a –75 dBm CW signal of 1931.55MHz (i.e. 300kHz offset from 1931.25 MHz ).

2. Measure a 300 kHz tuning on the analyzer. You should see a typical -52 dBm IQ tuning for CDMA pcs.

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Figure 11: Receiver IQ level on CDMA pcs band

Figure 12 shows the PCS spectrum with an inject tone at -75 dBm, as well as the IQ output test points. Note that DC is present on the IQ output test points. All test points should be approximately equal.

Figure 12: Pcs spectrum (left) and IQ output test points (right) (Picture will be updated )

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Receiver DC Test Points

Figure 13: Rx DC troubleshooting test points

Table 4 includes the descriptions and values for Rx DC troubleshooting test points shown in Figure 13.

Table 4: Rx DC Test Points

Test Point Description Value

1 VCCBIAS Test C319, 3.0V 2 VCCMX Test C324, 3.0V 3 VCCBB Test C323, 3.0V 4 VCCDD Test c322, 3.0V 5 VDDP Test C334, 3.0V

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Receiver RF Test Points

For the test points in Figure 14, an external signal source of –96 dBm was added to the RF input. Set LNA GAIN STATE = 4.The signal was then traced throughout the receiver chains. An Agilent8960 call box is recommended. Set the band and channel as ETS set. Set the cell power = - 96dBm. Watch the received power of the DSPM Rfc RXTX. Measurements were taken with the RF Probe. Signal levels are approximate, and the accuracy may be +/- 2 dB or more depending on the probe position and grounding.

Figure 14: Receiver RF troubleshooting test points

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Table 5 includes the descriptions and values for Rx RF troubleshooting test points shown in Figure 14.

Test Point Description Value

1 LNA IN 2 LNA_OUT 3 RX SAW OUTPUT1 4 RX SAW OUTPUT2

5 6 7 8 9

RX_QP RX_QN RX_IP RX_IN RX LO IN

About -96dBm About -80dBm About -82dBm About -82dBm

-3dB

Table 5: Rx RF Test Points

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1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care

Rx Path Troubleshooting

Rx path faults

No No

Measure DC test points at

table 4, is it OK?

Check U1001(ACT5808)

Reheat solder joints of

Yes

No

Measure Rx RF test points

1 at table 5, is it OK?

Reheat solder joints of

Yes

No

Measure Rx RF test points

Reheat solder joints of

Yes

No

Measure Rx RF test points

3 ,4 at table 5, is it OK?

Reheat solders joints of

Yes

No

Measure Rx RF test points

5,6,7,8 at table 5,is it OK?

Change U301

Yes

No

Measure RX RF test points

9 at table5, is it ok?

Change U202

Yes

Note:

Connect System

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

• The Shielding Case Assy can not be reused after removal.

Check antenna module

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

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Nokia 1508i, RM-430 RF Description and Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual