Nokia 1508i Troubleshooting Manual
Rf description and troubleshooting
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Also See for 1508i:
- User manual (73 pages) ,
- Troubleshooting manual (37 pages) ,
- Service manual (17 pages)
Related Manuals for Nokia 1508i
Summary of Contents for Nokia 1508i
- Page 1 1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care Nokia Customer Care 1508i (RM-430) Mobile Terminal RF Description and Troubleshooting Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 2 1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care Contents 1508i RF troubleshooting Issue 1 Copyright © 2008 Nokia, All rights reserved...
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Page 3: Component Layout
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) Issue 1 Copyright © 2008 Nokia, All rights reserved... - Page 4 1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care Figure 2: Component layout (Bottom) Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 5 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 Issue 1 Copyright © 2008 Nokia, All rights reserved...
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Page 6: Ams Setup For Tx Troubleshooting
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. Issue 1 Copyright © 2008 Nokia, All rights reserved... - Page 7 1508i(RM-430) RF Description and Troubleshooting Nokia Customer Care Figure 5: FTM dialog box (Picture will be updated ) Tx DC Test Points Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 8 3.0V Tx_VccIQmod 3.0V TX_AGC 1.92V for 5dBm, 2.16V for 15dBm, 2.4V for 25dBm. Tx IQ in 0.8 V With oscilloscope: 500 mV p-p Tx_vccRFVGA 3.0V Table 1: Tx DC Test Points Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 9 Test Point Description Value LO in About 0dBm RFout About 2dBm PA input About 0dBm PA output About 28dBm Coupler output About 26dBm Connector About 24dBm Table 2: Tx RF Test Points Issue 1 Copyright © 2008 Nokia, All rights reserved...
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Page 10: Tx Path Troubleshooting
• 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. Issue 1 Copyright © 2008 Nokia, All rights reserved... - Page 11 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. Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 12 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. Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 13 Note that DC is present on the IQ output test points. All test points should be approximately equal. (Picture will be updated ) Figure 12: Pcs spectrum (left) and IQ output test points (right) Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 14 Figure 13. Table 4: Rx DC Test Points Test Point Description Value VCCBIAS Test C319, 3.0V VCCMX Test C324, 3.0V VCCBB Test C323, 3.0V VCCDD Test c322, 3.0V VDDP Test C334, 3.0V Issue 1 Copyright © 2008 Nokia, All rights reserved...
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Page 15: Receiver Rf Test Points
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 Issue 1 Copyright © 2008 Nokia, All rights reserved... - Page 16 LNA IN About -96dBm LNA_OUT About -80dBm RX SAW OUTPUT1 About -82dBm RX SAW OUTPUT2 About -82dBm RX_QP RX_QN RX_IP RX_IN RX LO IN -3dB Table 5: Rx RF Test Points Issue 1 Copyright © 2008 Nokia, All rights reserved...
- Page 17 • CBP5.6 is underfilled and can not be replaced. • The Shielding Case Assy can not be reused after removal. • After using the heatgun, the domesheet needs to be replaced Issue 1 Copyright © 2008 Nokia, All rights reserved...