CC Technical Documentation RM-11 Series Transceivers Troubleshooting - RF (Part 1) Issue 1 02/2004 Confidential ©2004 Nokia Corporation
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Contents Page RF Troubleshooting ....................................................................................................... 3 Equipment List for RF Troubleshooting ......................................................................3 Phoenix Service Software ............................................................................................4 RF (Manual Control) Components in Phoenix ...................................
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation RF Troubleshooting The RM-11 features 1900MHz PCS CDMA, 800MHz Cell CDMA and AMPS, an internal antenna, GPS, an FM radio, a RUIM card, a color LCD, a VGA camera, and a flashlight.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation • Power supply • Diagnostic test jig • RF connector snap cable • Spectrum analyzer • Active FET probe • Tomahawk headset and universal headset for FM radio TX I TX IF CELL 173.6 MHz PCS 208.1 MHz TX VHF LO CELL PCS 346.2 MHz 416.2 MHz 1 0° 2 90 ° CELL 824.04 - 848.97 MHz 30 kHz Steps PCS 1850.00 - 1909.95 MHz 50 kHz Steps CELL 869.04 - 893.97 MHz 30 kHz Steps PCS 1930.00 - 1989.95 MHz 50 kHz Steps TX Block TX Q 346.
CC Technical Documentation RM-11 Troubleshooting - RF (Part 1) RF (Manual Control) Components in Phoenix c Phone Control in DSP Figure 4: Phone Control dialog box in DSP d RF Main Mode in RF Figure 5: RF Main Mode dialog box in RF Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 5
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation e CDMA Control in DSP Figure 6: CDMA Control dialog box in DSP f RF PDM in RF Figure 7: RF PDM dialog box in RF Page 6 ©2004 Nokia Corporation Confidential Issue 1 02/2004
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Observing Tx Output Spectrum on Analyzer dBm CDMA signal obtained in Local mode by turning modulation ON CDMA signal on channel 384 0 1 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 Start: 834.020000 MHz Res BW: 30 kHz 6/23/03 3:55:47 PM Vid BW: 30 kHz Stop: 839.020000 MHz Sweep: 50 ms HP8562E,007 Figure 8: Tx output spectrum To observe a Tx waveform using a spectrum analyzer: 1. Enable Local Mode on the Phone Control dialog box.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation 2. Select Cell (CDMA) in the Band field, and Rx/Tx (Tx path enabled) in the Mode field on the RF Main Mode dialog box. Figure 10: RF Main Mode dialog box 3. Select the Rho ON check box in the State area on the CDMA Control dialog box. Figure 11: CDMA Control dialog box 4. Adjust the three Tx AGC settings for the proper output power level on the RF PDM dialog box.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Following are definitions of the settings on the RF PDM dialog box: • Automatic Frequency Control (AFC): Control range from -1024 to +1023. Used as a control line to tune the VCTCXO. Monitor the change in frequency of the VCTCXO as the AFC is changed. Use in Local Mode only. • Automatic Gain Control for Transmitter (Tx AGC): Consists of the Tx IF AGC, the Tx RF AGC, and the PA AGC.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation h RF register Read/Write in RF Figure 14: RF Register R/W dialog box i Frequency Calculator in RF Figure 15: UHF Synthesizer dialog box Page 10 ©2004 Nokia Corporation Confidential Issue 1 02/2004
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation RF Tuning Parameters in Phoenix j Batch Tune in RF Figure 16: Batch Tune dialog box k RF Tuning in RF Figure 17: RF Tuning dialog box Note: When reading the tuning parameters from the phone, always use the “Read All” button in order to read the entire set of tuning values.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation RF AGC Status Components in Phoenix l RF AGC Status in RF LNA Gain (High/Low) PA AGC PDM Settings Rx IF AGC PDM Settings Rx RF AGC PDM Settings BBAMP Gain Settings Tx IF AGC PDM Settings Note: This RF AGC Status component only works in Call Mode. Always measure resistance with the phone powered OFF. CDMA In-Call Testing See Step 1 below Figure 18: CDMA In-call testing Note: There are two CDMA bands for this phone (Cell and PCS).
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation 1. Connect phone to call box via RF port (X814). (Add RF cable loss on call box ≅0.2 dB Cell band, ≅0.4dB PCS). 2. Power up the phone in “Normal” mode. 3. If you need to load CDMA PRL, first put the phone into Local Mode. Load the PRL; set the phone back to Normal Mode. Make sure to set the RF channel and SID according to PRL. 4. Register the phone and establish a call at –65 dBm call box sector power.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation 8. Compare the RSSI reading from the RF AGC status to the sector power. Compare the TX power to the digital average power on the call box. The reading should be accurate within +/- 2 dBm. 9. Verify that the cell PDMs for RX and TX are within the following tolerances: • Cell: Tx pwr (dBm) = -73 — RSSI • PCS: Tx pwr (dBm) = -76 — RSSI CDMA in Call Testing (High Gain) See step 10. Receiver Rx AGC See step 11. See step 11.
CC Technical Documentation RM-11 Troubleshooting - RF (Part 1) 13. Verify that all PDMs for Rx and Tx are within tolerances specified in Table 2. • Cell: Tx pwr (dBm) = -73 — RSSI • PCS: Tx pwr (dBm) = -76 — RSSI CDMA in Call Testing (AMPS) Figure 21: CDMA in call testing (AMPS) 1. Connect the phone to a call box via an RF port (X814). (Add the cable loss on the call box ≅0.2dB band.) 2. Power up the phone in Normal Mode. 3. If you need to load AMPS PRL: a. Put the phone into Local Mode. b.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Summary of Typical Cell Band PDM Readings Following are the typical cell band PDM readings for the Low Gain state: • RSSI = -65 dBm • LNA = Low Gain state • Rx IF AGC PDM = +93 • Tx IF AGC PDM = +27 • Tx RF AGC PDM = +237 • Tx PA Gain PDM = -330 • Tx Power = -11 dBm Figure 22: -65 dBm sector power CDMA channel 600 Following are the typical cell band PDM readings for the High Gain state: Page 16 • RSSI = -104 dBm • LNA = Hig
CC Technical Documentation RM-11 Troubleshooting - RF (Part 1) Figure 23: -104 dBm sector power CDMA channel 600 Summary of Typical PCS Band PDM Readings Following are the typical PCS band PDM readings for the Low Gain state: • RSSI = -65 dBm • LNA = Low Gain state • Rx IF AGC PDM = +54 • Tx IF AGC PDM = +24 • Tx RF AGC PDM = +125 • Tx PA Gain PDM = -327 • Tx Power = -8 dBm Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 17
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Figure 24: -65 sector power CDMA channel 384 Following are the typical PCS band PDM readings for the High Gain state: • RSSI = -103 dBm • LNA = High Gain state • Rx IF AGC PDM = -127 • Tx IF AGC PDM = -85 • Tx RF AGC PDM = -450 • Tx PA Gain PDM = +220 • Tx Power = +19 dBm Figure 25: -104 dBm sector power CDMA channel 384 Page 18 ©2004 Nokia Corporation Confidential Issue 1 02/2004
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Tx PDM Characteristic Curves (Phone Call Mode) Tx AGC PDM Plots in a Call 488 Tx_IF_AGC 388 Tx_RF_AGC PA_AGC 288 188 PDM 88 -12 -112 -212 -312 -412 -512 -50 -40 -30 -20 -10 0 Tx Pow er(dBm ) 10 20 30 Figure 26: Tx AGC PDM plots in a call Rx PDM Characteristic Curve (Phone Call Mode) Rx PDM AGC Plots in a Call 400 300 Sector Power (Hi to Lo) Sector Power (Lo to Hi) 200 PDM 100 0 This is a typical Rx AGC Curve that sweepin
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Waveform Quality (rho) This can be measured on the 8960 call box. Always measure at maximum power. The value should be greater than 0.97. The frequency error should be within +/-150Hz. Spurious Emissions (ACPR) ACPR can be measured on the 8960 call box. Always measure at maximum power. The limits for +/-885kHz and 1.98MHz are lower than at least -42dBc and -54dBc. Rx Tests Rx Sensitivity Measure this on the 8960 call box.
CC Technical Documentation RM-11 Troubleshooting - RF (Part 1) Supply Lines Measurement Using Phoenix Before writing to the phone, read the RF regulators from the phone to determine the current state.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation 12 RF-related Supply Lines Distribution VIO = 1.8VDC VREFRF1 = 1.35VDC UEM IC VR5 = 2.78VDC VR3 = 2.78VDC VREFRF2 = 1.35VDC VR7 = 2.78VDC VR2 = 2.78VDC VR1A = 4.75VDC VR4 = 2.78VDC VR6 = 2.78VDC VR1B = 4.75VDC VCORE = 1.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Supply Lines Distribution by RF Components Component Part Number Supply Lines Alfred N750 VR5 Batman N701 VR5, VR7, VIO, VREFRF1 Robin N601 VR2, VR3, VR6, VIO, VR1B, VREFRF2 Tomcat N603 VBAT PA N801 VR2, VBAT PA Detector N806 VR2 VCTCXO G503 VR3, VR1A UHF PLL N507 VIO, VR1A VCO G502 VR4 VCO Buffer N502 VR6 12 Supply Lines Resistance to Ground Supply Line Resistance Components VR1A 100kΩ to GND Synthesizer (
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Top RF-related Failures Seen in FLALI Test Failed What to Check RF EX Self-test Batman VHF PLL Perform Local Mode testing of Rx VHF PLL on Batman (N701). Check that voltage levels at VR5 and VR7 are 2.7V. Also, check UHF LO level into Alfred (N750). RF EX Self-test Robin VHF PLL CELL Perform Local Mode testing of the Tx VHF PLL on Robin (N601). Check DC voltage (VIO, VR2, VR3, VR6). Probe Tx chain in Local Mode.
RM-11 Troubleshooting - RF (Part 1) CC Technical Documentation Test Failed What to Check RF MS RX FER CELL CH384 At this stage, FER is most likely caused by a poor RF connection. Perform a conductive RSSI measurement with sector power at 65dBm (low LNA gain) and -100dBm (high LNA gain). RF MS SINAD SINAD is measurement of a phone’s audio quality in an AMPS call. Hence, a secured audio plug is needed to be checked for any connection problem. Verify this on the bench in an AMPS call.
RM-11 Troubleshooting - RF (Part 1) Page 26 ©2004 Nokia Corporation CC Technical Documentation Confidential Issue 1 02/2004
