Nokia 1508 User manual

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Nokia Customer Care

1508 (RM-338)

Mobile Terminal

RF Description and Troubleshooting

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Contents

1508 RF troubleshooting

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Contents Page

Component Layout................................................................................................4

TxTroubleshooting................................................................................................ 6

Tx System Block Diagram....................................................................................6

Tx Introduction......................................................................................................6

Main Tx Component.............................................................................................6

AMS Setup for Tx Troubleshooting......................................................................6

Tx DC Test Points................................................................................................7

Tx RF Test Points................................................................................................8

Tx DC Test Points................................................................................................9

Tx Path Troubleshooting....................................................................................10

RxTroubleshooting..............................................................................................11

Rx System Block Diagram..................................................................................11

Rx Introduction....................................................................................................11

AMS Setup for Rx Troubleshooting.....................................................................11

Cell Receiver Check from RF to IQ.....................................................................12

Receiver DC Test Points....................................................................................14

Receiver RF Test Points.....................................................................................14

Rx Path Troubleshooting....................................................................................16

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Component Layout

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

Figure 1: Component layout (Top)

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Figure 2: Component layout (Bottom)

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Tx Troubleshooting

Tx System Block Diagram

Figure 3: Tx system block diagram

Tx Introduction

The GRF6401 (Figure 3) provides the Zero-IF transmit signal path for Cellular-CDMA

transmission. For this chipset, Cellular-CDMA refers to band classes 0 and 3 as defined by

the cdma2000 standard, with mobile station transmitters operating between 824 and 849

MHz. The transmit signal path includes baseband amplifiers, quadrature upconversion, gain

control RF amplifier. The gain control RF amplifier output is routed to the final stages of the

transmit chain –Tx saw filter, power amplifier, direction coupler, duplexer, and antenna.

Main Tx Component

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.

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

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 “Cell”, Channel “384”, then send..

7. Choose CP TX CDMA Test send

8. Choose DSPM TX AGC Config. Set Hyst State “medium 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.

Figure 5: FTM dialog box

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Tx DC Test Points

Figure 6: Tx DC test point

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

Test Point Description Value

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

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

3 LOCK_DET 3.08V for Lock, 0 V for unlock

4 TX_AGC 1.92V for 5dB, 2.16V for 15dB, 2.4V for 25dB.

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

6 Tx_on 2.8 V

Table 1: Tx DC Test Points

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

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 Tx saw output about 4dBm

2 PA input about 2dBm

3 PA output about 28dBm

4 TCXO_RF about 0dBm

5 RF connector about 24dBm

6 Coupler output about 26dBm

Table 2: Tx RF Test Points

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Tx Path Troubleshooting

No No No

yes

No No

yes

No No

yes

Tx path faults

Measure DC test points

at table 1,is it OK?

Measure Tx RF test point

1 at table 2, 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

6 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

4 at table 2, is it OK?

Chan

e U202

Reheat the solder joints of R113

Reheat the solder joints of U101 Change U101

Reheat the solder

oints of L113

Measure Tx RF test point

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

oints of C119, U108,U107

Reheat the solder joints of L112, L123

Check antenna module

Change U403

Chan

e U104

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

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.

• U101 is PA, which need suitable tools.

Rx Troubleshooting

Rx System Block Diagram

Figure 9: Rx DC troubleshooting test points

Rx Introduction

The GRF6401 IC (Figure 9) provides the Zero-IF receiver signal path for Cellular-CDMA

reception. For this chipset, Cellular-CDMA refers to band class 0 as defined by the

cdma2000 standard, with mobile station receivers operating between 869 and 894 MHz. The

Rx signal path includes the LNA, Rx saw filter, quadrature downconversion, and baseband

functions. The Cellular-CDMA receive signal is routed from the antenna to the cellular LNA

IC via the duplexer. The analog baseband outputs interface with Via’s CBP5.6 that also

provide status and control signaling. Integrated Rx LO circuits, ideally supplemented by the

GRF6401 transceiver IC, provide frequency plan flexibility and further reduce PCB parts

count.

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 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

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

6. Choose CP PLL Channel Config. Set Band “Cell”, Channel “384”, 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 384 channel, The level set to -96dBm.

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

Figure 10: FTM dialog box

Cell Receiver Check from RF to IQ

When the AMS is ready for Cell RX troubleshooting, If 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 as according to Table3. Then test the RF

trace.

1. Inject a –75 dBm CW signal of 881.82 MHz (i.e. 300 kHz offset from 881.52 MHz or 10

channels away).

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

CDMA Cell.

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Figure 11: Receiver IQ level on CDMA Cell band

Figure 12 shows the Cell 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: Cell spectrum (left) and IQ output test points (right)

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

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.

Test Point Description Value

1 RF_ON1,R103 About 2.9V

2 VDD_RX,L801 About 2.6V

3 VDD_RX,R104 About 2.6V

4 VDD_RX,C212 About 2.6V

Table 4: Rx DC Test Points

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 = 5.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. 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. 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.

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Figure 14: Receiver RF troubleshooting test points

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

Figure 14.

Test Point Description Value

1 LNA IN About -96dBm

2 RX SAW INPUT About -80dBm

3 RX SAW OUTPUT About -82dBm

Table 5: Rx RF Test Points

1508(RM-388)

RF Description and Troubleshooting

Nokia Customer Care

Issue 1

Rx Path Troubleshooting

No No

Yes

No No

Yes

Note:

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

• The Shielding Case Assy can not be reused after removal

• U106 is under the shielding frame, it is hard to reheat or change

• U203 is under the shielding frame, it is hard to reheat or change

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

Rx path faults

Measure DC test points at

table 4, is it OK?

Measure Rx RF test points

1 at table 5, is it OK?

Measure Rx RF test points

2 at table 5, is it OK?

Measure Rx RF test points

3 at table 5, is it OK?

Connect System simulator

to MS antenna Check antenna module

Reheat solders joints of

U203

Reheat solder joints of

U106

Change U106

Reheat solder joints of

L105

Check U1001(ACT5808) Reheat solder joints of U1001

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