CCS Technical Documentation RH-12/RH-28 Series Transceivers 6(b) - RF Troubleshooting Instructions Issue 1 02/04 Nokia Corporation
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation [This page left intentionally blank] Page 2 Nokia Corporation Issue 1 02/04
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Table of Contents Page No Introduction.................................................................................................................... 5 Notes on reference measurements ...............................................................................5 Helgo / Synthesizer Troubleshooting............................................................................. 6 N500 Helgo troubleshooting ..........................
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation [This page left intentionally blank] Page 4 Nokia Corporation Issue 1 02/04
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Introduction This document is the troubleshooting guide for RH-12/RH-28. On the following pages you will find a step-by-step fault finding procedure and reference measurements at the relevant signal points. Notes on reference measurements • LF & DC signals are measured with Textronix 100 MHz Scope (TDS3014) and P3010 13pF probe.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Helgo / Synthesizer Troubleshooting 4 4 b a 1 f 4 1 c e 1 2 a 2 1 b 1 1 d 1 3 3 a 3 Page 6 Nokia Corporation c d 3 3 b c Issue 1 02/04
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation N500 Helgo troubleshooting N500 HELGO troubleshooting Set Phoenix to RF local burst RX mode Measure N500 Helgo supply voltages: - VR1 at C551 - 4,75V? - VR2 at C520 - 2,8V? - VR3 at C503 - 2,8V? - VR4 at C554 - 2,8V? - VR5 at C553 - 2,8V? - VR6 at C555 - 2,8V? - VR7 at C297 - 2,8V? (located at BB bottom grid S3) Measure N500 reference voltage: VrefRF01 = 1,35V (C549) Measure N500 serial bus signals - RfBusClk at J501 - RfBusEna1 a
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Synthesizer troubleshooting Synthesizer Troubleshooting Phoenix: RF local mode Rx continuous Frequency = 3590.4 MHz @ ch. 38 Measure G501 VCTCXO output voltage at G501 pin 3 26 MHz 600 mVpp. OK ? Measure N500 26 MHz reference output voltage at L515 800 mVpp. OK? Measure G501 VCTCXO AFC voltage at C540. Measure RF frequency and level at T500.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Tx Troubleshooting 11a 11a 9 11b 11b 9 6 1b 1b 6 11c 11c 2a 1a 1a 2b 2a 2b 10 3 10 8b 4 8a 8a 5 4 7 7 3 8b 5 Issue 1 02/04 Nokia Corporation Page 9
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Tx 850/900 GMSK troubleshooting TX850/900 GMSK troubleshooting Apply a 50 ohm load at the antenna connector of the jig. GSM850/ ch. 190 = 836.6 MHz, burst mode power level 10. GSM900/ cha. 37 = 897.4 MHz, burst mode power level 10 Spectrum analyzer: RBW = 500 Khz and VBV = 500 kHz, center = 500 kHz and span = 20 MHz Measure voltage of a) TXI at C535 and TXQ at C536, Txi and TXQ = 500 mVpp min. and 1.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Tx 1800/1900 GMSK troubleshooting TX1800/1900 GMSK troubleshooting Apply a 50 ohm load at the antenna connector of the jig. GSM1800 ch. 700 = 1747,8 MHz, burst mode power level 5 GSM1900 ch. 661 = 1880,0 MHz, burst mode power level 5 Spectrum analyzer RBW = 500 kHz and VBW = 500 kHz, center = 500 kHz and span = 20 MHz Measure voltage of a) TXI at C535 and TXQ at C536, Txi and TXQ = 500 mVpp min. and 1.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Rx Troubleshooting 4 6 5 3 3 3 3 b 3 c c 3 3 c 6 a 2a b 3 3 a 2 a 2 b b 1 1 1 a a 1 b a 1 b 1 b 4 4 4 Page 12 Nokia Corporation Issue 1 02/04
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Rx 850/900 troubleshooting RX 850/900 Troubleshooting GSM850 ch. 190 or GSM900 ch. 37. Continuous Rx. Use AGC “gain step” 14 Apply a signal of 942.46771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J800 Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 MHz and span = 20 MHz Measure voltage of a) RXI (J511) b) RXQ (J510). RXI and RXQ = 800 mVpp and 1.35 VDC. Note: DC level drops after a while.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Rx 1800 troubleshooting RX 1800 Troubleshooting GSM1800 ch. 700. Continuous Rx. Use AGC “gain step” 14 Apply a signal of 1842,86771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J800 Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 1840 MHz and span = 20 MHz Measure voltage of a) RXI (J511) b) RXQ (J510). RXI and RXQ = 500 mVpp and 1.35 VDC. Note: DC level drops after a while.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Rx 1900 troubleshooting RX 1900 Troubleshooting GSM1900 ch. 661. Continuous Rx. Use AGC “gain step” 12. Apply a signal of 1960,06771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J800. Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, f = 1960 MHz and span = 20 MHz Measure voltage of a) RXI (J511) b) RXQ (J510). RXI and RXQ = 700 mVpp and 1.35 VDC.
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Bluetooth / FM Radio Troubleshooting 4 8 7 a 4 7 a c 2 1 4 9 6 6 a b2 3 2 d 5 2 2 e c 1 b 5 4 b b 2 b 1 a a s 3 g M F i nla Page 16 Nokia Corporation Issue 1 02/04
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation Bluetooth troubleshooting Bluetooth troubleshooting Phoenix local mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW). BC02 Bluetooth control. Options: Internal gain = 52 Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 Mhz and span = 20 Mhz. NOK Measure PURX voltage = 1.8 V (N131) BB troubleshooting OK Measure N130 BT supply voltage = 2.8V (C144).
RH-12/RH-28 RF Troubleshooting Instructions CCS Technical Documentation FM radio troubleshooting FM Radio Troubleshooting Phoenix: Testing -> FM radio -> Power on. FM signal: Frequency = 100 MHz, frequency deviation = 67.5 kHz, modulation frequency = 1 kHz, R=L, pilot tone on and RF level -67 dBm. Signal is injected at X102 bottom connector pin 11, 12, 13 or 14. Alternative: Use FM signal received by headset.
