Nokia RM-155, 2366i RF Description and Troubleshooting
Nokia Customer Care
2366i (RM-155)
Mobile Terminals
RF Description and
Troubleshooting
Issue 2 - February 2007 Company Confidential ©2007 Nokia Corporation
2366i (RM-155)
RF Description and Troubleshooting
Contents Page
Introduction ..................................................................................................................................................... 5
Preliminary RF Troubleshooting ..............................................................................................................6
RF Troubleshooting Equipment List ........................................................................................................7
Configure Phoenix for RF Troubleshooting ..........................................................................................7
Transmitter RF Troubleshooting .............................................................................................................. 10
Transmitter Schematics ...........................................................................................................................11
Transmitter Troubleshooting Guidelines .............................................................................................13
Transmitter Initial Troubleshooting ......................................................................................................13
DC Power Checks ................................................................................................................................... 14
Cell Tx Setup ........................................................................................................................................... 14
PCS Setup................................................................................................................................................. 16
Transmitter RF Troubleshooting Procedures ......................................................................................17
Failed Test: Tx PA Detector ................................................................................................................. 18
Tx Output Spectrum.............................................................................................................................. 19
Tx RF Component Diagram ................................................................................................................. 20
DC Test Points......................................................................................................................................... 21
TX RF Test Points .....................................................................................................................................22
Receiver RF Troubleshooting .................................................................................................................... 23
Receiver Block Diagram ...........................................................................................................................24
Receiver Schematics .................................................................................................................................25
RF AGC Status ............................................................................................................................................26
Turning on the Receive Path ..................................................................................................................27
Switching the Rx Gain States ................................................................................................................29
Receiver Diagnostic Signal Tracing ......................................................................................................29
Receiver DC and RF Test Points ......................................................................................................... 30
Receiver I and Q Test Points ...................................................................................................................34
Synthesizer Troubleshooting .................................................................................................................... 36
VCTXCO Troubleshooting .........................................................................................................................36
Synthesizer Schematic .............................................................................................................................37
Synthesizer Troubleshooting Setup ......................................................................................................38
Synthesizer Troubleshooting ..................................................................................................................39
Incorrect PLL Frequencies.................................................................................................................... 40
AFC Voltage Troubleshooting .................................................................................................................41
VCTCXO Manual Tuning....................................................................................................................... 42
GPS Troubleshooting................................................................................................................................... 44
GPS RF Block Diagram .............................................................................................................................44
GPS RF Schematic .....................................................................................................................................44
GPS Troubleshooting Setup ....................................................................................................................45
HW Self Test Failure.............................................................................................................................. 46
Oscillator Test Failure........................................................................................................................... 46
CW (Mode 3) Test Failure.................................................................................................................... 47
GPS DC Test Points................................................................................................................................ 47
GPS RF Troubleshooting Setup........................................................................................................... 48
GPS RF Probe Points.............................................................................................................................. 49
Bluetooth Troubleshooting ....................................................................................................................... 50
Bluetooth Schematic ................................................................................................................................50
Test Setup 1 ................................................................................................................................................50
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Nokia Customer Care RF Description and Troubleshooting
Test Setup 2 ................................................................................................................................................52
Test Setup 3 ................................................................................................................................................53
Test Setup 4 ................................................................................................................................................54
Test Setup 5 ................................................................................................................................................55
Bluetooth Troubleshooting Flowchart .................................................................................................56
Bluetooth DC and RF Probe Points .......................................................................................................57
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RF Description and Troubleshooting Nokia Customer Care
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Nokia Customer Care RF Description and Troubleshooting
Introduction
The 2366i mobile terminal is based on a tri-mode, code division multiple access or
“CDMA,” dual-band engine and a GPS receiver.
DC/DC
Converter
FM Radio
IC (Not
used)
Figure 1: PWB components - top
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RF Description and Troubleshooting
Coupler
GPS
Connector
Diplexer
PCS Duplexer
Cell/PCS PA
Cell Duplexer
Cell TX Filter
TX IC
PCS TX Filter
VCORE
TX ASIC
UEMCR D2200
Memory (D3000)
UPP (D2800)
32KHz
VFlash 1
VR3
VANA
GPS LNA
RX circuits
G7100
19.2MHz
VPP
FBus Tx
MBus Tx/Rx
FBus Rx
VR1A
VR1B
VIO
VSIM
Bluetooth
Figure 2: PWB components - bottom
Preliminary RF Troubleshooting
Verify the following if the mobile terminal cannot make a call:
• The mobile terminal is in Normal or Test Mode (i.e., the mobile terminal is
searching for a signal, net server is on).
• The Preferred Roaming List (PRL) is loaded into the mobile terminal (for Normal
mode).
• The mobile terminal is tuned and has passed tuning. Read the tuning parameters
using the Read Parameters component in Phoenix. An untuned mobile terminal
has all zeros in the tuning file.
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Nokia Customer Care RF Description and Troubleshooting
• The call box channel is set for a channel in PRL.
• The SID is correct and entered into the mobile terminal. For Test mode, SID is 4
and paging channel is: 385/Cell and 1175/PCS.
• The VCTCXO is centered properly within tuning limits as described in the
"VCTCXO Manual Tuning" section on page 42.
• The transmitter and receiver are working properly in Local mode. See "Transmitter
RF Troubleshooting"onpage10 and "Receiver RF Troubleshooting"onpage23
for detailed information.
RF Troubleshooting Equipment List
You will need the following equipment for RF troubleshooting:
• Computer with AMS version of Phoenix
• Agilent 8960 CDMA call box (or equivalent)
• Signal generator
• Power supply
• Digital multimeter
• Diagnostic test jig
• Spectrum analyzer
• AMS RF Probe, AAS-10A or AAS-10B
• Oscilloscope
• RF connectors and cables
• High impedance probe (optional)
Configure Phoenix for RF Troubleshooting
1. Ensure that the phone is connected to the computer as shown in "Service
Configurations", in the Service Tools chapter.
2. Start the Phoenix software and set it up with the following controls:
• Troubleshooting > Phone Control
• Troubleshooting > RF > Main Mode
• Troubleshooting > RF > CDMA Control
• Troubleshooting > RF > PDM Control.
See Figure 3.
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RF Description and Troubleshooting
Figure 3: Phoenix Control Setup
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Nokia Customer Care RF Description and Troubleshooting
3. In the Phone Control window, select the Phone State tab, Local, and Execute.
4. See Table 1 for the remaining settings.
Table 1: Phoenix Settings—RF Test
For Cell For PCS
RF Main Mode window: 1. Select Cell (CDMA)
2. Select Channel (384
3. Select RX/TX mode
4. Select “Set”.
CDMA Control window: 1. Select Mode 1 (IS95/Voice)
2. De-select Default PDM
3. Select Cell Band
4. Select Rho ON
5. Select “Execute”.
PDM Control window: Set values:
• PC_DC_DC = -208
• V CTL = -361
• AGC1 = 412 mA
Set up the Spectrum Analyzer as
indicated:
Typical default values for TX RF
PDM:
Note: these are representative
values only; actual values are set
according to the tuning file. These
settings are for an output power of
20 dBm.
• Center frequency: 836.52 MHz
• Span: 100 MHz
• Amplitude: 20 dBm
• Attuenuation: auto
• BW: auto
AGC1 = -248
V CTL = -361
PC_DC_DC = 208
Current = 412 mA
1. Select PCS (CDMA)
2. Select CHannel (600)
3. Select TX/TX mode
4. Select “Set:.
1. Select Mode 1 (IS95/Voice)
2. De-select Default PDM
3. Select PCS Band
4. Select Rho ON
5. Select “Execute”.
Set values:
• PC_DC_DC = -213
• V CTL = -428
• AGC1 = 372 mA
• Center frequency: 1880 MHz
• Span: 100 MHz
• Amplitude: 20 dBm
• Attuenuation: auto
• BW: auto
AGC1 = -213
V CTL = -428
PC_DC_DC = 265
Current = 372 mA
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RF Description and Troubleshooting
Transmitter RF Troubleshooting
Figure 4 is the block diagram for the Tx RF system.
Figure 4: Transmitter system block diagram
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Nokia Customer Care RF Description and Troubleshooting
Transmitter Schematics
The following schematics are for general reference only. See the Schematics chapter for detailed versions.
TX LO Lock
Voltage
Loop
Filter
TX IC
Figure 5: Transmitter schematic
PCS TX
Filter
Cell TX Filter
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RF Description and Troubleshooting Nokia Customer Care
PCS Duplexer
Diplexer
PA IC
DC-DC Converter
Cell Duplexer
Figure 6: Power Amplifier schematic
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Nokia Customer Care RF Description and Troubleshooting
Figure 7: Measurement Points and Voltages
Transmitter Troubleshooting Guidelines
Use the following guidelines when troubleshooting.
• Always perform visual inspection of PCB under microscope to check proper
placement, rotation, and soldering of components.
• Look for the presence of a well-defined CDMA modulated signal on a spectrum
analyzer at the correct frequency. If a signal is present but off frequency or the
shape looks distorted, check the synthesizer. Possibly, one of the synthesizers is
not locked or the VCO has no output signal. Check the synthesizers for proper
frequency and amplitude. See "Tx Output Spectrum" on page 19 and "Synthesizer
Troubleshooting"onpage36.
• Check that power supplies to the transmitter have the correct voltage. See "Tx RF
Component Diagram" on page 20.
• If the signal is very low in amplitude, check the probing diagram to determine
what part of the TX chain is ‘broken’. See "DC Test Points" on page 21.
• Check that AGC PDMs produce and adjust TX power within the proper limits.
Transmitter Initial Troubleshooting
Prepare the test setup:
1. Connect the RF test connector to a call box.
2. Connect the phone to the Phoenix PC
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RF Description and Troubleshooting
3. Set up Phoenix as described in "Configure Phoenix for RF
Troubleshooting"onpage7.
DC Power Checks
Check the Tx DC points to ensure that voltages are present (see "TX RF Test
Points"onpage22).
1. Use a voltmeter to check that all VTX_RF, VTX_PPA, and VPA voltages are present.
If any voltage is missing, check for surface mount problems around the TX IC, the
PA, and the PA DC-to-DC Converter.
2. Verify that the Tx_Reg_EN, PA_DC-DC_EN, and PA_Cell/PCS_EN voltages are
present. If VTX_PPA is low and the surface mount connections are good around
the TX IC, replace the Tx Regulator (N7002). If VPA is low and surface mount
connections are good around the PA and DC-DC converter, replace the DC-DC
converter.
3. Use a voltmeter to check that VIO and VR1A voltages are present. If any is
missing, check for surface mount problems around the UEMCR. If the surface
mount connections appear good, replace the UEMCR IC.
4. Use a voltmeter to check that TxAGC1, PA_Vctrl, and PA Dc to DC PDM voltages
5. Verify that all the enable voltages (Tx_Reg_En, PA_DC-DC_EN, and PA_Cell/
Use the following sections to set up troubleshooting in Phoenix according to the band
you are using:
•"Cell Tx Setup"onpage14
•"PCS Setup"onpage16
Cell Tx Setup
Use the following procedures to prepare for Cell Tx troubleshooting using Phoenix.
1. Connect the mobile terminal to the PC via a test jig. (The bottom connector is a
2. Connect a power supply to the mobile terminal.
3. On the Phone Control dialog box, click the LOCAL button in the Phone State
from the UPP are present.
PCS_EN) are activated. If any of these signals are missing, check the surface
mount connections around the PDM lines. If the surface mount connections all
appear good, replace the UPP.
USB port.)
area to put the mobile terminal into Local Mode. (See "Configure Phoenix for RF
Troubleshooting"onpage7.)
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4. Open the Troubleshooting menu, point to RF, and click RF Main Mode. The RF
Main Mode dialog box appears.
Figure 8: RF Main Mode dialog box for Cell Mode
5. Select the following values on the RF Main Mode dialog box:
• Band = Cell (CDMA)
• Channel = 384
• Mode = Rx/Tx
6. Click Set.
Note: Be sure that the “RF Main Mode set successfully” message appears in
the status bar.
7. Open the Troubleshooting menu, point to RF, and click CDMA Control. The
CDMA Control dialog box appears.
Do NOT select this option
Figure 9: CDMA Control dialog box for Cell Tx troubleshooting
8. Select the following values:
• State = Rho ON
• Band = Cell
• Radio Configuration = Mode 1: IS-95 Voice
Note: Do NOT select the Set default PDM values option.
9. Click Execute.
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RF Description and Troubleshooting
10. Configure the spectrum analyzer using the following values:
• Center Frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
Table 2: RF PDM Values
Description/Field Reference Value
AGC1 -248
V ctl -361
PA_DC_DC 208
Current 412mA
PCS Setup
Use the following procedures to prepare for PCS Tx troubleshooting using Phoenix.
1. Connect an RF test connector to a call box.
2. Connect the mobile terminal to the PC via a test jig. (The bottom connector is a
USB port.)
3. Connect a power supply to the mobile terminal.
4. Open the Troubleshooting menu, and point to Phone Control. The Phone
Control dialog box appears. ("Configure Phoenix for RF
Troubleshooting"onpage7.)
5. Click the LOCAL button in the Phone State area to put the mobile terminal into
Local Mode.
6. Open the Troubleshooting menu, point to RF, and click RF Main Mode. The RF
Main Mode dialog box appears. (See "Configure Phoenix for RF
Troubleshooting"onpage7.)
7. Select the following values on the RF Main Mode dialog box:
• Band = PCS (CDMA)
• Channel = 600
• Mode = Rx/Tx
8. Click Set.
Note: Be sure that the “RF Main Mode set successfully” message appears in
the status bar.
9. Open the Troubleshooting menu, point to RF, and click CDMA Control. The
CDMA Control dialog box appears. (See Figure 9 on page 15.)
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Nokia Customer Care RF Description and Troubleshooting
10. Select the following values on the CDMA Control dialog box.
• State = Rho ON
• Band = PCS
• Radio Configuration = Mode 1: IS-95 Voice
Note: Do NOT select the “Set default PDM values” option.
11. Click Execute.
12. Open the Troubleshooting menu, point to RF, and click PDM Control.
13. Configure the spectrum analyzer using the following values:
• Center Frequency = 1880 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
Table 3: RF PDM Values
Description/Field Reference Value
AGC1 -136
V ctl -428
PA_DC-DC 265
Current 372mA
Transmitter RF Troubleshooting Procedures
After Phoenix is set up using either the Cell, or PCS setup procedures, use the following
procedures to troubleshoot the Transmitter RF section:
1. Using an oscilloscope, check the I and Q input modulation wave forms at test
points. See "Tx RF Components of the PWB"onpage20. They should all be
present with an AC swing of about 500mVpp, with an offset of +1.5 V dc.
• If one or more waveforms is missing, look for SMD problems around these
resistors.
• If the SMD is good, replace the UEMCR.
2. Use an AAS-10 RF probe to probe the Cell Tx output of the Tx IC. See Figure 10
for setup parameters and a typical display.
• If there is no RF or low RF, look for a faulty SMD around the Tx IC N7001.
• If the SMD is okay, replace the N7001 TX IC.
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RF Description and Troubleshooting
3. Probe the PA input.
• If the level is low, look for an SMD issue on the Tx SAW filter.
• Reflow or replace the filter as necessary.
4. Probe the PA output.
• If the RF is missing or low, look for Vbat, VCC_PA, and VR1A voltages and
SMD issues on and around the PA IC N7300.
• If these are okay, replace the PA IC N7300.
5. Probe the duplexer output.
• If the RF is missing or low, reflow or replace the duplexer.
6. Probe the coupler output.
• If the RF is missing or low, reflow or replace the coupler.
7. Probe the diplexer output.
• If the RF is missing or low, reflow or replace the diplexer Z7301.
Failed Test: Tx PA Detector
Use the following steps if you encounter a failed test for the Tx PA detector:
8. Use Phoenix to set the mobile terminal into Local Mode and activate the Tx with
default output power.
• The output power at the RF test connector should be 20dBm ± 4dB. If not,
adjust the PDM values or troubleshoot per procedure above.
9. Using a voltmeter on DC, probe the detector output at C7300. The voltmeter
should read approximately 0.86 V. If not, replace N7300.
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