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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
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CCS Technical Documentation Table of Contents
RH-12/RH-28 RF Troubleshooting Instructions
Page No Introduction.................................................................................................................... 5 Notes on reference measurements ...............................................................................5 Helgo / Synthesizer Troubleshooting............................................................................. 6 N500 Helgo troubleshooting ........................................................................................7 Synthesizer troubleshooting .........................................................................................8 Tx Troubleshooting........................................................................................................ 9 Tx 850/900 GMSK troubleshooting ..........................................................................10 Tx 1800/1900 GMSK troubleshooting ......................................................................11 Rx Troubleshooting...................................................................................................... 12 Rx 850/900 troubleshooting ......................................................................................13 Rx 1800 troubleshooting ............................................................................................14 Rx 1900 troubleshooting ............................................................................................15 Bluetooth / FM Radio Troubleshooting ....................................................................... 16 Bluetooth troubleshooting .........................................................................................17 FM radio troubleshooting ..........................................................................................18
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RH-12/RH-28 RF Troubleshooting Instructions
CCS Technical Documentation
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CCS Technical Documentation
RH-12/RH-28 RF Troubleshooting Instructions
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. RF signals are measured with R&S FSIQ 7GHz Spectrum Analyzer and Agilent resistive divider probe (10dB, 500ohm). Please be aware that the RF connector on service adaptor is leaking power (into air) and acts as noise source when probing on RX chain. In 1800 band the problem is most severe while there is no external LNA to amplify the signal above the noise level like in the 1900 band. In 900/ 850 band the leakage is not as high due to lower frequency. GSM SA settings: RBW=500kHz, VBW=500kHz. Bluetooth SA settings: RBW=2MHz, VBW=2MHz. All reference measurements were made on a RH-12 phone (GSM900). RH-28 (GSM850) results should be very similar. RF loss Module Repair Jig: 0.3dB (low bands), 0.4dB (high bands). RF loss RF Adaptor: 0.4dB (low band), 0.7dB (high bands).
· · · · ·
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RH-12/RH-28 RF Troubleshooting Instructions
CCS Technical Documentation
Helgo / Synthesizer Troubleshooting
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RH-12/RH-28 RF Troubleshooting Instructions
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 at J502 - Reset at J503 - RfBusData at J509 All .measured in Burst Mode Logic high level = 1,8V. NOK
Check baseband.
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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. Place the probe through the hole in the shield!
NO
Correct frequency found?
YES
Synthesizer is ok
No frequency or wrong frequency ?
Wrong frequencies found YES
No frequency found within the 3-4 GHz span YES Measure VCO supply voltage at C560 = 2.8 V OK ? YES Replace VCO
Measure VCO control voltage at C505. Voltage = 4.8V? NO VCO does not work or the control loop is open
Check C503, R501, R502, C504, C505
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RH-12/RH-28 RF Troubleshooting Instructions
Tx Troubleshooting
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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 1.2 VDC during burst Measure a) TXC = 950 mV during burst at R522 and b) TXP = 1.8 V during burst at J504 . Note: TXC voltage is a function of power level NOK NOK
Measure modulator supply voltage VR2 = 2.7 V (C568, both terminals) Measure RF level = -13 dBm at input of Z700 SAW filter L700 Measure RF level = -13 dBm at N700 PA input (C707)
Check baseband. Check N500 Helgo. Check Z700 Tx SAW.
NOK
Measure RF level = +7 dBm at N700 PA output TX_OUT_EGSM (Z809) NOK Measure N700 PA power detector DET = 850 mV during burst at R503. Note: DET voltage is a function of power level
OK
Measure N700 PA control voltage a) VPCTRL_G = 1.2 V during burst at R715 and N700 PA bias voltage. b) VTXB_G = 2.7V (C533). Note: VPCTRL_G voltage is a function of power level.
Measure N700 PA supply voltage VBAT at C724
Measure RF level = 2 dBm at antenna pad J800
Measure Z809 antenna switch control signal voltages a) VANT_1 = 0 V at C804 b) VANT_2 = 0 V at C806 c) VANT_3 = 2.7 V at C805
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RH-12/RH-28 RF Troubleshooting Instructions
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 1.2 VDC during burst Measure a) TXC = 900 mV during burst at R522 and b) TXP = 1.8 V during burst at J504 . Note: TXC voltage is a function of power level Measure modulator supply voltage VR2 = 2.7 V at R539 Measure RF level = -15 dBm at input of T700 Tx balun C709 NOK NOK
Check baseband. Check N500 Helgo. Check T700 Tx balun.
Measure RF level = -20 dBm at N700 PA input L702
NOK OK
Measure RF level = -3 dBm at N700 PA output TX_OUT_DCS (Z809) NOK Measure N700 PA power detector DET = 810 mV during burst at R503. Note: DET voltage is a function of power level
Measure N700 PA control voltage a) VPCTRL_P = 1.0 V during burst at R716 and N700 PA bias voltage b) VTXB_P = 2.7 V (C532). Note: VPCTRL_P voltage is a function of power level.
Measure N700 PA supply voltage VBAT at C724
Measure RF level = 2 dBm at antenna pad J800 Measure Z809 antenna switch control signal voltages a) VANT_1 = 2.7 V at C804 b) VANT_2 = 2.7 V at C806 c) VANT_3 = 0 V at C805
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CCS Technical Documentation
Rx Troubleshooting
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RH-12/RH-28 RF Troubleshooting Instructions
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. Change the signal level to -30 dBm
OK
Measure RF level = -55 dBm at Z808 SAW filter input. NOK Measure Z809 antenna switch control signal voltages a) VANT_1 = 0V (C804) b) VANT_2 = 0V (C806) c) VANT_3 = 0V (C805). OK Measure RF level = -55 dBm at Helgo input (C840, both terminals). NOK
go to "Helgo/Synthesizer troubleshooting"
OK
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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. Change the signal level to -30 dBm
OK
Measure RF level = -30 dBm at Z807 SAW filter input. (Z809 antenna switch pin X) NOK Measure Z809 antenna switch control signal voltages a) VANT_1 = 0V (C804) b) VANT_2 = 0V (C806) c) VANT_3 = 0V (C805). OK NOK
Measure RF level at Helgo input (C839, not assembled, both terminals).
go to "Helgo/Synthesizer troubleshooting"
OK
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RH-12/RH-28 RF Troubleshooting Instructions
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. Change the signal level to -50 dBm and set "gain step" = 6
OK
Measure RF level at Z806 SAW filter input. (Z809 antenna switch pin X) NOK Measure antenna switch control signal voltages a) VANT_1 = 0V (C804) b) VANT_2 = 2.7V (C806) c) VANT_3 = 0V (C805).
Measure RF level at V802 LNA input (C826).
Measure RF level at V802 LNA output (C829)
go to "Helgo/Synthesizer troubleshooting"
Measure a) V802 LNA supply voltage LNA_P = 2.8 V (V802 pin 4) and b) LNA control voltage LNAB_P = 2,8 V (R801) OK
Measure RF level at N500 Helgo input (L805).
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CCS Technical Documentation
Bluetooth / FM Radio Troubleshooting
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RH-12/RH-28 RF Troubleshooting Instructions
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.
Measure PURX voltage = 1.8 V (N131) OK
NOK
BB troubleshooting
Measure N130 BT supply voltage = 2.8V (C144). OK
NOK
Replace N131
Measure N130 VDD-ANA voltage regulator output = 1.8V (C140). OK Measure a) N130 VDD_VCO supply voltage = 1.8V (C137) b) VDD_MEM supply voltage = 1.8V c) Rx/Tx supply voltage = 1.8V (C130) OK
NOK
Replace N130
NOK
Check L133, R132 and L130
Measure SYSCLK voltage = 550 mVpp (26 MHz) 1.3 VDC (C133). NOK OK Measure N130 XTAL_IN voltage = 1.8Vpp square wave (R131) OK NOK
Check C133 and go to Synthesizer troubleshooting.
Measure D130 supply voltage = 2,8V at D130 pin 5 NOK Check L131, L132. If passive componentsOK, replace D130. NOK Check L131, L132. If passive components OK, replace N130
Measure RF level = -15 dBm at a TX_A (C131) and b) TX_B (C132). OK
Measure RF level = -18 dBm at Z131 SAW filter input. OK Measure RF level = -18 dBm at Z131 SAW filter output.
NOK
Check T130 and C130
NOK
Replace Z131
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RH-12/RH-28 RF Troubleshooting Instructions
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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.
Measure audio voltage a) VAFL = 200 mVpp (1 kHz) 850 mVDC (C380, both sides b) VAFR = 200mVpp (1 kHz) 850 mVDC (C382, both sides).
OK
FM Radio OK
NOK
Measure N356 supply voltages a) VCCD = 2.78 V (C359) b) VCCA = 2.78 V (C372) c) VCCVCO = 2.78 V (C362) d)VCOTANK1 = 2.78 V (L356) e) VCOTANK2 = 2.78 V (L357).
NOK
Check passives and then go to BB troubleshooting.
OK
Measure N356 XTAL2 voltage = 600 mVpp (32.768 kHz) 1.7 VDC (C375)
NOK
Check C374 and C375, then go to BB troubleshooting
OK
Measure CPOUT voltage = 0.9 V @ 100 MHz (V356).
NOK
OK
Measure RF level at antenna input (C367).
Check V356, V357, L356, L357, R359, C357 and C358.
NOK Visual inspect C110-C113, L103 (all bottom
side, grid T5), C367, C378, C379 and L358.
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