CCS Technical Documentation RH-27 Series Transceivers Troubleshooting - RF (Part 1) Issue 1 11/2003 Confidential ©2003 Nokia Corporation
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Contents Page No RF Troubleshooting ....................................................................................................... 3 Equipment List for RF Troubleshooting ......................................................................4 Phoenix Service Software ............................................................................................4 RF (Manual Control) Components in Phoenix ................................
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation RF Troubleshooting The RH-27 is based on Apollo Engine with dual band, tri-mode operation. The handsets are based on GSM Wolfgang/Jacqueline mechanics with a common engine. RH-27 features 1900MHz PCS CDMA, 800MHz Cell CDMA and AMPS, an internal antenna, GPS, FM radio, RUIM card, and a color LCD, and a VGA camera.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Equipment List for RF Troubleshooting • Computer with Phoenix • Agilent 8960 CDMA call box Note: (If 8960 is not available, then a Signal Generator is needed. • 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.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation RF Tuning in RF RF AGC Status in RF RF (Manual Control) Components in Phoenix c Phone Control in DSP d RF Main Mode in RF Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 5
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation e CDMA Control in DSP f RF PDM in RF Page 6 ©2003 Nokia Corporation Confidential Issue 1 11/2003
RH-27 Troubleshooting - RF (Part 1) CCS 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.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation p q RF PDM Settings 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. Used as control lines to adjust the transmitter output levels. Monitor the Tx power with call box or analyzer.
CCS Technical Documentation RH-27 Troubleshooting - RF (Part 1) Note: This RF PDM component only works in Local Mode.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Other RF Parameters in Phoenix g Gen I/O in RF h RF register Read/Write in RF i Frequency Calculator in RF Page 10 ©2003 Nokia Corporation Confidential Issue 1 11/2003
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation RF Tuning Parameters in Phoenix j Batch Tune in RF k RF Tuning in RF 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.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation RF AGC Status Components in Phoenix l RF AGC Status in RF LNA Gain (High/Low) Rx IF AGC PDM settings BBAMP Gain settings Note: This RF AGC Status component only works in Call Mode. Tx IF AGC PDM settings Tx RF AGC PDM settings PA AGC PDM settings NOTE: Always measure resistance with the phone powered OFF. CDMA In-Call Testing 1 Page 12 Connect phone to call box via RF port (X814). (Add RF cable loss on call box ≅0.2 dB Cell band, ≅0.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation 2 Power up phone in “Normal” mode. 3 If necessary, to load CDMA PRL, first put phone into “Local” mode. Load PRL; set phone back to “Normal” mode. Make sure to set RF channel and SID according to PRL. 4 Register phone and establish call at –65dBm Call box sector power. • If you cannot register phone, set sector power to –25dBm and try again.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Cell: Tx pwr (dBm) = -73 — RSSI PCS: Tx pwr (dBm) = -76 — RSSI CDMA In Call Testing (High Gain) Rx AGC PA AGC RF AGC Receiver IF AGC Transmitter AGC Tolerances for -105dBm INPUT 9 Band Rx AGC IF AGC RF AGC PA AGC Cell CDMA >-150 -115+-15 <-400 =220 PCS CDMA >-150 -100+-20 <-400 =220 If Steps 6-9 are OK, then adjust the call box sector power to -105dBm. This will turn the LNA to High Gain.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation CDMA In Call Testing (AMPS) 1 Connect Phone to call box via RF port (X814). (Add cable loss on call box ≅0.2dB band.) 2 Power up phone in “Normal” mode. 3 If necessary, to load AMPS PRL, put phone into “Local” mode first, load PRL, then set phone back to “Normal” mode. Make sure to set Call Box control channel and SID. 4 Use “Call Control” under DSP menu. Add 8-digit phone number and create AMPS call.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Summary of Typical Cell Band PDM Readings Typical PDM Values -65dBm Sector Power CDMA CH600 Page 16 ©2003 Nokia Corporation RSSI = -65dBm 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 = -11dBm Confidential Issue 1 11/2003
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Typical PDM Values -104dBm Sector Power CDMA CH600 Issue 1 11/2003 Confidential RSSI = -104dBm LNA = High Gain State Rx IF AGC PDM = -115 Tx IF AGC PDM = -54 Tx RF AGC PDM = -456 Tx PA Gain PDM = +220 Tx Power = +19dBm ©2003 Nokia Corporation Page 17
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Summary of Typical PCS Band PDM Readings Typical PDM Values -65dBm Sector Power CDMA CH384 Page 18 ©2003 Nokia Corporation RSSI = -65dBm 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 = -8dBm Confidential Issue 1 11/2003
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Typical PDM Values RSSI = -103dBm 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 = +19dBm -104dBm Sector Power CDMA CH384 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 Issue 1 11/2003 -40 Confidential -30 -20 -10 0 Tx Pow er(dBm ) ©2003 Nokia Corporati
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation 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 sweeping from –25 ~ -109 dBm Note that the abrupt change of PDM is due to the LNA gain state switched between Hi and Lo gains -100 -200 -300 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 Rx Power (dBm) Key RF Performance Tests in Call Mode Tx Tests
CCS Technical Documentation RH-27 Troubleshooting - RF (Part 1) 2dB. Vary the sector power from -25dBm to -104dBm for accuracy. If the RSSI reading is off (e.g., 20dB), start the Local Mode troubleshooting. LNA Switching (High/Low Gain State) When in a call, you can verify at what point the LNA is turned ON (High Gain State) by using the Phoenix RF AGC component. The indicator for the LNA will turn red when it is turned ON. Usually, the LNA turns ON in between -93dBm and -95dBm.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Supply Lines Measurement Using Phoenix Baseband Regulator component There are 12 RFRF-related regulators 1. VR1A 2. VR1B 3. VR2 4. VR3 5. VR4 6. VR5 7. VR6 8. VR7 9. VrefRF1 10. VrefRF2 11. VIO 12. VCORE Before writing to phone, read the RF Regulators from phone to determine current state. 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.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Supply Lines Distribution by RF Components 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 VR1A 100kΩ to GND Synthesizer (VCTCXO, UHF PLL) VR1B 29kΩ to GND Robin VR2 4.
RH-27 Troubleshooting - RF (Part 1) CCS 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.
RH-27 Troubleshooting - RF (Part 1) CCS Technical Documentation Test Failed What to Check RF MS RX FER PCS CH600 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 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).
RH-27 Troubleshooting - RF (Part 1) Page 26 ©2003 Nokia Corporation CCS Technical Documentation Confidential Issue 1 11/2003
