Nokia 1508I User manual

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
Nokia Customer Care
1508i (RM-430)
Mobile Terminal
RF Description and Troubleshooting

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
Contents
1508i RF troubleshooting

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
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
Copyright © 2008 Nokia, All rights reserved
Figure 2: Component layout (Bottom)

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
Tx Troubleshooting
Tx System Block Diagram
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
cou
p
ler
Duplexer

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
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
Copyright © 2008 Nokia, All rights reserved
Figure 5: FTM dialog box (Picture will be updated )
Tx DC Test Points

1508i(RM-430)
RF Description and Troubleshooting
NokiaCustomerCare
Issue 1
Copyright © 2008 Nokia, All rights reserved
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
Copyright © 2008 Nokia, All rights reserved
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
Copyright © 2008 Nokia, All rights reserved
Tx Path Troubleshooting
No No No
yes
No
yes
No
yes
No
yes
No No
yes
No
yes
No
yes
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
g
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
g
e U109
Reheat the solder
j
oints of C113, U101
Measure Tx RF test point
6 at table 2, is it OK? Reheat the solder
j
oints of R107, U107
Reheat the solder joints of L123, C120
Check antenna module