Nokia RM-14 User manual

Nokia Customer Care
ISSUE 1 11/04 Copyright © 2004 Nokia. All Rights Reserved.
6(b) - RF Troubleshooting
Instructions
6(b) RF Troubleshooting
and Manual Tuning

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
2 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
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ISSUE 1 11/04 COMPANY CONFIDENTIAL 3
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
Table of Contents
Page No
Introduction ......................................................................................................... 5
Notes on reference measurements.................................................................... 5
Helgo / Synthesizer Troubleshooting................................................................ 6
N500 Helgo troubleshooting .............................................................................. 7
Synthesizer troubleshooting............................................................................... 8
Tx Troubleshooting............................................................................................. 9
Tx 900 GMSK troubleshooting......................................................................... 10
Tx 1800/1900 GMSK troubleshooting.............................................................. 11
Rx Troubleshooting .......................................................................................... 12
Rx 900 troubleshooting.................................................................................... 13
Rx 1800 troubleshooting.................................................................................. 14
Rx 1900 troubleshooting.................................................................................. 15
Bluetooth / FM Radio Troubleshooting........................................................... 16
Bluetooth troubleshooting................................................................................ 17
FM radio troubleshooting................................................................................. 18
Service Tool Concept for RF Tunings ............................................................. 19
Service concept for RM-14 RF tunings............................................................ 20
Receiver Tunings............................................................................................... 21
RX channel select filter calibration................................................................... 21
RX calibration................................................................................................... 22
EGSM900 band ............................................................................................. 22
GSM1800 band .............................................................................................. 24
GSM1900 band .............................................................................................. 25
RX band filter response compensation............................................................ 26
EGSM900 band ............................................................................................. 27
GSM1800 band .............................................................................................. 30
GSM1900 band .............................................................................................. 31
Transmitter Tunings.......................................................................................... 33
TX power level tuning ...................................................................................... 33
EGSM900 PA High Mode with EDGE off ....................................................... 34
EGSM900 PA high mode with EDGE on ....................................................... 35
GSM1800 PA high mode with EDGE off ........................................................ 36
GSM1800 PA high mode with EDGE on ........................................................ 37
GSM1900 PA high mode with EDGE off ........................................................ 38
GSM1900 PA high mode with EDGE on ........................................................ 39
TX I/Q tuning.................................................................................................... 40

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
4 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
EGSM900 band with EDGE Off ..................................................................... 40
EGSM900 band with EDGE On ..................................................................... 42
EGSM1800 band with EDGE Off ................................................................... 42
GSM1800 band with EDGE On ..................................................................... 42
GSM1900 band with EDGE Off ..................................................................... 42
GSM1900 band with EDGE On ..................................................................... 43
List of Figures
Page No
Fig 1 Helgo/Synthesizer........................................................................................ 6
Fig 2 PA/TX........................................................................................................... 6
Fig 3 Helgo/Synthesizer........................................................................................ 9
Fig 4 PA/TX........................................................................................................... 9
Fig 5 TX 900 GMSK troubleshooting .................................................................... 10
Fig 6 TX 1800/1900 GMSK troubleshooting ......................................................... 11
Fig 7 Helgo/Synthesizer........................................................................................ 12
Fig 8 PA/TX........................................................................................................... 12
Fig 9 RX 900 troubleshooting................................................................................ 13
Fig 10 RX 1800 troubleshooting............................................................................ 14
Fig 11 RX 1900 troubleshooting............................................................................ 15
Fig 12 Bluetooth/FM.............................................................................................. 16
Fig 13 Bluetooth troubleshooting .......................................................................... 17
Fig 14 FM radio troubleshooting ........................................................................... 18

ISSUE 1 11/04 COMPANY CONFIDENTIAL 5
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
Introduction
This document is the troubleshooting guide for RM-14. On the following pages you will find a
step-by-step fault finding procedure and reference measurements at the relevant signal points.
Note! Most test points are not accessible unless shielding cans are cut open.
This must ONLY be done by the Return Analysis technicians and for analysis
only!
■ 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 band the leakage is not as high due to lower fre-
quency.
• GSM SA settings: RBW=500kHz, VBW=500kHz.
• Bluetooth SA settings: RBW=2MHz, VBW=2MHz.
• All reference measurements were made on a RM-14 phone (GSM900).
• RF loss Module Repair Jig: 900: 0.6 dB, 1800: 1.1dB and 1900: 1.2dB. Bluetooth
is 1.8dB.

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
6 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
Helgo / Synthesizer Troubleshooting
Figure 1:Helgo/Synthesizer
Figure 2:PA/TX

ISSUE 1 11/04 COMPANY CONFIDENTIAL 7
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
■ N500 Helgo troubleshooting
N500 HELGO troubleshooting
Set Phoenix to RF local burst RX mode
Measure N500 reference voltage:
.
VrefRF01 = 1,35V (C549)
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 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.
-VR1 at C516 - 4,75V?
-VR2 at C510 - 2,8V?
-VR3 at C522 - 2,8V?
-VR4 at C520 -2,8V?
-VR5 at C518 -2,8V
-VR6 at C521 -2,8V?
-VR7 at C500 -2,8V?
(C524)
1,44V

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
8 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
■ Synthesizer troubleshooting
Synthesizer Troubleshooting
Phoenix: RF local mode Rx continuous
Frequency = 3770.4 MHz @ ch. 38
Measure G501 VCTCXO output voltage at G501 pin 3
26 MHz 900 mVpp. OK ?
Measure N500 26 MHz reference output voltage at
Measure G501 VCTCXO AFC voltage at C540.
Measure RF frequency and level at T500.
Place the probe through the hole in the shield!
Correct frequency found? YES
NO
No frequency or wrong frequency ?
Synthesizer is ok
No frequency found within the 3-4 GHz span
Wrong frequencies found
Measure VCO supply voltage at C560
= 2.8 V OK ?
Replace VCO
YES
Measure VCO control voltage at C505.
YES
YES
VCO does not work or
the control loop is open
NO
Check C503, R501, R502,
C504, C505
L515 800 mVpp. OK?
Voltage = 4.8V?
R420
C52
7
C504
C501
Check R502, C503, C504
R501 and C502

ISSUE 1 11/04 COMPANY CONFIDENTIAL 9
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
Tx Troubleshooting
Figure 3:Helgo/Synthesizer
Figure 4:PA/TX

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
10 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
■ Tx 900 GMSK troubleshooting
Figure 5:TX 900 GMSK troubleshooting
TX850/900
GMSK
t
rou
bl
es
h
oo
ti
ng
Apply a 50 ohm load at the antenna connector of the jig.
GSM900/ cha. 37 = 897.4 MHz, burst mode power level 10
Spectrum analyzer: RBW = 500 Khz and VBW = 500 kHz,
center = 500 kHz and span = 20 MHz
c) VANT_3 = 2.7 V at C810
b) VANT_2 = 0 V at C809
a) VANT_1 = 2.7 V at C811
Measure Z800 antenna switch control signal voltages
Measure N700 PA supply voltage VBAT at C705
Measure RF level = 20 dBm at antenna pad J124
Note: VPCTRL_G voltage is a function of power level.
b) VTXB_G = 2.7V (C701).
R713 and N700 PA bias voltage.
Measure N700 PA control voltage a) VPCTRL_G = 1.2 V during burst at
Note: DET voltage is a function of power level
Measure N700 PA power detector DET = 850 mV during burst at R701.
NOK
(Z800 pin1)
Measure RF level = +10 dBm at N700 PA output TX_OUT_EGSM OK
Measure RF level = -13 dBm at N700 PA input (R704 pin1)
Measure RF level = -13 dBm at input of Z700 SAW filter C702
Measure modulator supply voltage VR2 = 2.7 V (C511, both terminals)
Measure voltage of a) TXI at C529 and TXQ at C530,
Txi and TXQ = 500 mVpp min. and 1.4 VDC during burst
Measure a) TXC = 800 mV during burst at R514 and
b) TXP = 1.8 V during burst at J504 .
Note: TXC voltage is a function of power level
Check
baseband.
NOK
NOK
NOK
Check
N500 Helgo.
Check Z700
Tx SAW.
TX 900 GMSK troubleshooting

ISSUE 1 11/04 COMPANY CONFIDENTIAL 11
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
■ Tx 1800/1900 GMSK troubleshooting
Figure 6:TX 1800/1900 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
and span = 20 MHz
c) VANT_3 = 2.7 V at C810
b) VANT_2 = 2.7 V at C809
a) VANT_1 = 0 V at C811
Measure Z800 antenna switch control signal voltages
Measure N700 PA control voltage a) VPCTRL_1800/1900 = 1.0 V during burst at R715
and N700 PA bias voltage
b) VTXB_1800/1900 = 2.7 V (C709).
Note: VPCTRL_1800/1900 voltage is a function of power level.
Measure RF level = 2 dBm at antenna pad J124
Measure N700 PA supply voltage VBAT at C705
Note: DET voltage is a function of power level
Measure N700 PA power detector DET = 810 mV during burst at R701.
NOK
Measure RF level = -3 dBm at N700 PA output TX_OUT_DCS (Z800)
OK
Measure RF level = -10 dBm at N700 PA input R707 pin1
Measure RF level = -15 dBm at input of T700 Tx balun C714
Measure modulator supply voltage VR2 = 2.7 V at L505
Note: TXC voltage is a function of power level
b) TXP = 1.8 V during burst at J504 .
Measure a) TXC = 800 mV during burst at R514 and
Measure voltage of a) TXI at C529 and TXQ at C530,
Txi and TXQ = 500 mVpp min. and 1.4 VDC during burst
TX1800/1900 GMSK troubleshooting
Check
baseband.
NOK
Check
N500 Helgo.
NOK
NOK Check T700
Tx balun.
and N700 PA bias voltage

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
12 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
Rx Troubleshooting
Figure 7:Helgo/Synthesizer
Figure 8:PA/TX

ISSUE 1 11/04 COMPANY CONFIDENTIAL 13
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
■ Rx 900 troubleshooting
Figure 9:RX 900 troubleshooting
RX 900 Troubleshooting
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 J124
Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz,
center = 942 MHz and span = 20 MHz
Measure voltage of a) RXI (J512) b) RXQ (J513). RXI and
RXQ = 800 mVpp and 1.35 VDC.
Note: DC level drops after a while.
Change the signal level to -30 dBm
Measure RF level = -55 dBm at Z803 SAW filter input.
Measure Z800 antenna switch control signal voltages
a) VANT_1 = 0V (C811)
b) VANT_2 = 0V (C809)
c) VANT_3 = 0V (C810).
Measure RF level = -55 dBm
at Helgo input (C808, both terminals).
go to
“Helgo/Synthesizer
troubleshooting”
NOK
OK
OK
OK
NOK

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
14 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
■ Rx 1800 troubleshooting
Figure 10: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 J124
Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz,
center = 1840 MHz and span = 20 MHz
Measure voltage of a) RXI (J512) b) RXQ (J513).
Note: DC level drops after a while.
Change the signal level to -30 dBm
Measure RF level = -30 dBm at Z802 SAW filter input.
Measure Z809 antenna switch control signal voltages
a) VANT_1 = 0V (C811)
b) VANT_2 = 0V (C809)
c) VANT_3 = 0V (C810).
Measure RF level
at Helgo input
(C807, not assembled, both terminals).
go to
“Helgo/Synthesizer
troubleshooting”
NOK
OK
OK
(Z800 antenna switch pin11)
OK
NOK
RXI and RXQ = 500 mVpp and 1.35 VDC.

ISSUE 1 11/04 COMPANY CONFIDENTIAL 15
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
■ Rx 1900 troubleshooting
Figure 11: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 J124.
Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz,
f = 1960 MHz and span = 20 MHz
Measure voltage of a) RXI (J512) b) RXQ (J513). RXI and
RXQ = 700 mVpp and 1.35 VDC.
Change the signal level to -50 dBm and set “gain step” = 6
Measure RF level at Z801 SAW filter input.
Measure antenna switch control signal voltages
a) VANT_1 = 0V (C811)
b) VANT_2 = 2.7V (C809)
c) VANT_3 = 2.7V (C810).
Measure RF level at V800 LNA input (C801).
(Z800 antenna switch pin1)
OK
NOK
Measure RF level at V800 LNA output (C804)
Measure a) V800 LNA supply voltage LNA_P = 2.8 V (V800 pin 4)
and b) LNA control voltage LNAB_P = 2,8 V (R801)
Measure RF level at N500 Helgo input (L807). OK
troubleshooting”
“Helgo/Synthesizer
go to

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
16 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
Bluetooth / FM Radio Troubleshooting
Figure 12:Bluetooth/FM

ISSUE 1 11/04 COMPANY CONFIDENTIAL 17
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
■ Bluetooth troubleshooting
Figure 13:Bluetooth troubleshooting
Bluetooth troubleshooting
Phoenix normal mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW).
BC02 Bluetooth control. Options: Internal gain = 52
Measure N130 BT supply voltage = 2.8V (C6036). Replace N6031
NOK
OK
Replace N6030
NOK
b) VDD_MEM supply voltage = 1.8V
c) Rx/Tx supply voltage = 1.8V (C130)
Check L6033
and L130
NOK
Measure SYSCLK voltage = 800 mVpp (26 MHz) 1.8 VDC (C6038). Check C6038 and go to
Synthesizer
troubleshooting.
Measure N6030 XTAL_IN
voltage = 0.6Vpp square wave (R6042)
Measure D6030 supply voltage = 2,8V
at C6040
Check L6031, L6032. If passive components
OK, replace D6030.
Measure RF level = -15 dBm at a TX_A and TX_B,
(C6046) at both terminals
Replace Z6030
Check L6031, L6032. If passive componen
OK, replace N6030
NOK
NOK
NOK
NOK
OK
OK
OK
OK
OK
Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz,
center = 942 Mhz and span = 20 Mhz.
NOK
Measure N6030 VDD-ANA voltage regulator output = 1.8V (C6031)
Measure a) N6030 VDD_VCO supply voltage = 1.8V (C6048)
and
and R6034
Check L6033
OK
Measure RF level = -18 dBm at Z6030 SAW filter output.

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
18 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
■ FM radio troubleshooting
Figure 14:FM radio troubleshooting
FM Radio Troubleshooting
Phoenix: Testing -> FM radio -> Power on.
FM signal: Frequency = 100 MHz, frequency deviation = 67.5 kHz, modulation fre-
quency = 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 (C6180, both sides
b) VAFR = 200mVpp (1 kHz) 850 mVDC
(C6182, both sides).
FM Radio OK
NOK
OK
Measure CPOUT voltage = 0.9 V @ 100 MHz (C6162). Check 6158, R6159,
R6160, C6162
and C6157
Visual inspect C110, C111 and L1103
NOK
NOK
OK
Measure RF level at antenna input (C6176).
C6179, C6176, C6178 and L6176
(all bottom side) and

ISSUE 1 11/04 COMPANY CONFIDENTIAL 19
Copyright © 2004 Nokia. All Rights Reserved.
RM-14
RF Troubleshooting and Manual Tuning Nokia Customer Care
Service Tool Concept for RF Tunings
All RF tunings for RM-14 phones must be carried out in MJ-34 Module Jig.
Power to MJ-34 should be supplied from an external DC power supply, not FPS-8 prommer.
MJ-34 input voltages:
• Maximum + 16 VDC
• Nominal input for RF tunings is +12 V DC
Remember cable attenuation when setting required RF levels.
RF tunings should be made in the same order as shown in this document, the order of the cor-
responding menu items in the Phoenix Service SW may be different.
If baseband tunings are needed, they should be made before the RF tunings.
Avoid unnecessary tuning – factory tuning values are always the most accurate ones.
Views in this document may change as the service software is developed. Please refer to the
Phoenix help files, phone model specific service manual and bulletins for help.

RM-14
Nokia Customer Care RF Troubleshooting and Manual Tuning
20 COMPANY CONFIDENTIAL ISSUE 1 11/04
Copyright © 2004 Nokia. All Rights Reserved.
■ Service concept for RM-14 RF tunings
Table 1:
Item Type Description Product code
1 MJ-34 Module jig 0780346
2 PCS-1 DC power cable 0730012
3 XRF-1 Modular cable 0730085
4 DAU-9S Service MBUS cable 0730108