Nokia 6265 Guide

Nokia Customer Care
6265/6265i/6268 (RM-66)
Mobile Terminals
Issue 1 11/2005 Company Confidential ©2005 Nokia Corporation
RF Description and
Troubleshooting

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RF Description and Troubleshooting
Page 2 ©2005 Nokia Corporation Company Confidential Issue 1 11/2005
Contents Page
Mobile Terminal Components ..................................................................................................................... 5
Preliminary RF Troubleshooting.................................................................................................................. 7
Mobile Terminal Cannot Make a Call ....................................................................................................7
Tx Power Low ................................................................................................................................................7
Transmitter RF Troubleshooting ................................................................................................................. 8
Transmitter Block Diagram .......................................................................................................................9
Transmitter Schematics ...........................................................................................................................10
Transmitter Troubleshooting Setup ......................................................................................................12
AMPS Tx Setup ....................................................................................................................................... 12
Cell Tx Setup ........................................................................................................................................... 15
PCS Setup................................................................................................................................................. 17
Transmitter RF Troubleshooting Procedures ......................................................................................19
Failed Test: Tx PA Detector ................................................................................................................. 20
Tx Output Spectrum.............................................................................................................................. 21
Tx DC Test Points ................................................................................................................................... 22
Tx RF Test Points .................................................................................................................................... 23
DC Test Points......................................................................................................................................... 24
Receiver RF Troubleshooting .................................................................................................................... 25
Receiver Block Diagram ...........................................................................................................................26
Receiver Schematics .................................................................................................................................27
RF AGC Status ............................................................................................................................................29
Turning on the Rx Path ............................................................................................................................30
Switching the Rx Gain States ................................................................................................................32
Checking AMPS from RF to IQ ...............................................................................................................33
Checking CDMA CELL Receiver from RF to IQ ...................................................................................35
Checking CDMA PCS Receiver from RF to IQ ....................................................................................37
Receiver Diagnostic Signal Tracing ......................................................................................................38
Receiver RF Test Points ........................................................................................................................ 39
Receiver IF Test Points.......................................................................................................................... 40
Receiver DC Test Points........................................................................................................................ 41
Receiver Logic Input Voltages ................................................................................................................42
Rx Front-End Receiver Troubleshooting .............................................................................................43
Synthesizer Troubleshooting .................................................................................................................... 45
Synthesizer Block Diagram .....................................................................................................................46
Synthesizer Schematics ...........................................................................................................................47
Synthesizer Troubleshooting Setup ......................................................................................................48
Incorrect PLL Frequencies.................................................................................................................... 49
VCTCXO Troubleshooting .........................................................................................................................50
AFC Voltage Troubleshooting .................................................................................................................52
VCTCXO Manual Tuning....................................................................................................................... 53
UHF Synthesizer Schematic ....................................................................................................................55
UHF Synthesizer Troubleshooting .........................................................................................................56
PCS UHF LO CH600 Typical Spectrum .................................................................................................57
Rho and UHF LO..................................................................................................................................... 57
CELL UHF LO CH384 Typical Spectrum ...............................................................................................58
Rho and UHF LO..................................................................................................................................... 58
Rx VHF LO (Rx Back-End IC) Troubleshooting ...................................................................................60

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Tx UHF LO Schematic ...............................................................................................................................61
Tx UHF LO (Tx IC) Troubleshooting .......................................................................................................62
UHF PCS Tx LO (3700 ~ 3819.90)/2MHz Typical Spectrum ..........................................................63
UHF CELL Tx LO (3296.16 ~ 3395.88)/4MHz Typical Spectrum ...................................................64
GPS Troubleshooting................................................................................................................................... 65
GPS RF Block Diagram .............................................................................................................................65
GPS RF Schematic .....................................................................................................................................66
GPS Troubleshooting Setup ....................................................................................................................67
HW Self Test Failure.............................................................................................................................. 68
Oscillator Test Failure........................................................................................................................... 68
CW (Mode 3) Test Failure.................................................................................................................... 68
GPS DC Test Points................................................................................................................................ 69
GPS RF Troubleshooting Setup........................................................................................................... 70
GPS RF Test Points................................................................................................................................. 71
FM Radio Troubleshooting ........................................................................................................................ 72
FM Radio Schematic .................................................................................................................................72
FM Radio Testing - Pop-portTM Headset and UHJ Headset .........................................................73
FM Radio Parts Layouts ...........................................................................................................................74
FM Radio Test Points ................................................................................................................................75
Bluetooth Troubleshooting ....................................................................................................................... 76
Bluetooth Schematic ................................................................................................................................76
Bluetooth Troubleshooting .....................................................................................................................77
Test Setup 1............................................................................................................................................. 77
Test Setup 2............................................................................................................................................. 78
Test Setup 3............................................................................................................................................. 79
Test Setup 4............................................................................................................................................. 80
Test Setup 5............................................................................................................................................. 81
Bluetooth Troubleshooting Flowchart .................................................................................................82
Bluetooth DC and RF Test Points ..........................................................................................................83
Bluetooth DC and RF Test Points ...................................................................................................... 83

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Mobile Terminal Components
The mobile terminal includes two PWB boards, the main PWB and the UI PWB.
Following are the components of the PWB.
Figure 1: PWB - RF component layout - top
PCS Tx Filter
CELL Tx Filter
VCTCXO
Synthesizer IC
Bluetooth section
Rx back-end IC
CDMA IF Saw
filter
AMPS IF Xtal
filter
FM Radio
section
Cell PA
PCS PA
Tx IC
Rx front-end IC
GPS connector
Cell duplexer
VCO
PCS duplexer
Diplexer
RF connector
Antenna connector pad
DC-DC connector
D2800
UEMEK

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Figure 2: PWB - RF component layout - bottom
RX I/Q signal
test points
FM Radio
production
test points

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Preliminary RF Troubleshooting
The following sections identify steps to troubleshoot some common RF issues.
Mobile Terminal Cannot Make a Call
Verify the following if the mobile terminal cannot make a call:
1. The mobile terminal is in Normal Mode (i.e., the mobile terminal is searching for
a signal).
2. The Preferred Roaming List (PRL) is loaded into the mobile terminal.
3. 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.
4. The call box channel is set for a channel in PRL.
5. The SID is correct and entered into the mobile terminal.
6. The VCTCXO is centered as described in the "VCTCXO Manual Tuning" section on
page 53.
7. The transmitter and receiver are working properly in Local Mode. See
"Transmitter RF Troubleshooting"onpage8and "Receiver RF
Troubleshooting"onpage25 for detailed information.
Tx Power Low
Complete the following steps if Tx power is low:
1. Perform a visual inspection of the PWB under a microscope to check for the
proper placement, rotation, and soldering of components.
2. Use Phoenix to turn on the transmitter in Local Mode.
3. Look for the presence of a Tx signal on a spectrum analyzer at the correct
frequency.
• If a signal is present but off-frequency, check the synthesizers for proper
frequency and amplitude. One of the synthesizers may be unlocked or the
VCO has no output signal.
• If a signal is not present or is present but is low in amplitude, check the
probing diagrams to determine where in the chain the fault occurs. (See "DC
Test Points" on page 24.)
4. Ensure that the power supplies to the Tx have the correct voltage. (See "Tx DC
Test Points" on page 22)
5. Ensure that the AGC PDMs are set for the desired Tx power and that the AGC
voltages are correct. (See "AMPS Tx Setup"onpage12, "Cell Tx
Setup"onpage15, or "PCS Setup"onpage17.)

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Transmitter RF Troubleshooting
Following are the main Tx RF components.
Figure 3: Main transmitter RF components
Cell PACell Tx SAW filter
PCS Tx SAW filterTx IC PCS PA PCS Duplexer PCS Coupler
Power detector
Cell coupler
Cell DuplexerDC/DC converter
Do not remove shield when checking DC/DC converter.
C7319 is DC/DC output voltage
Diplexer
C7317

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Transmitter Block Diagram
Following is the block diagram for the Tx RF system.
Figure 4: Tx system block diagram
Div 4
A
ntenna
Diff/Single
Phone test
Connector
RF_BUS_ENABLE ( SIO from TIKU)
RF_BUS_DATA
Div 2
CELL PA
PLL
Pwr Det
PCS PA
Diff/Single
VCC_PA
Iref_CEL
Iref_PCS
Cell Duplexer
PCS Duplexer
Coupler
Coupler
TX_AGC1
RF_BUS_CLK (19.2 MHz )
DCOUT
TEMP
Diplexer
TX_IP
TX_IN
TX_QP
TX_QN
PWROUT
TX_GATE
VCC_PA
A
GC
A
GC
A
GC
A
GC
PA_BIAS
PA_DC_DC_PDM
PA_DC_DC_ENABLE DC/DC
Converter
VBAT
VBAT
Tx IC
N7000

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Transmitter Schematics
The following schematics are for general reference only. See the Schematics chapter for detailed versions.
Figure 5: Transmitter schematic 1
N7000 Tx IC
Tx LO lock
voltage
Loop filter
Cell Tx filter
PCS Tx filter

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Figure 6: Transmitter schematic 2
PCS duplexer Diplexer
Couplers
PCS PA
Cell duplexer Thermistor
Power detector
Antenna Sense Line
Cell PA
DC-DC Converter

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Transmitter Troubleshooting Setup
Use the following sets of procedures to troubleshoot the transmitter using Phoenix. Due
to the compact layout of the mobile terminal, some of the major test points are not
accessible without destroying the shield frames and the LED lamp. To minimize effort,
check the following in order:
1. Tx power at the RF connector.
2. All Tx DC points.
3. All soldering jig points for the whole Tx chain.
4. UHF LO presence:
• If the UHF LO is present, check the N7000 output.
• If the UHF LO is not present, it is a synthesizer problem.
5. If there is no N7000 output:
a. Change the N7000.
b. If the problem persists, reflow the duplexers, diplexer, and couplers.
c. If the problem persists, change the PA.
6. If there are several failed mobile terminals with the same symptoms, it may be
necessary to break one to determine the cause.
Use the following sections to set up troubleshooting in Phoenix according to the band
you are using:
•"AMPS Tx Setup"onpage12
•"Cell Tx Setup"onpage15
•"PCS Setup"onpage17
AMPS Tx Setup
Use the following procedures to prepare for AMPS Tx troubleshooting using Phoenix.
1. Connect the RF test connector to a spectrum analyzer.
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 click Phone Control.
The Phone Control dialog box appears.

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5. Click the LOCAL button in the Phone State area to put the mobile terminal into
Local Mode.
Figure 7: Phone Control dialog box
6. Open the Troubleshooting menu, point to AMPS, and click AMPS Control.
The AMPS Control dialog box appears.
Figure 8: AMPS Control dialog box
7. Click the Tx Control tab.
8. In the Set Channel field, type 384.
9. In the Power Level field, type 5.
10. Select the DSP 2 codes check box
11. Select the Transmitter ON option, and click Execute.

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12. Configure the spectrum analyzer using the following values:
• Center Frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
Figure 9: RF PDM dialog box for AMPS
13. Click Read Phone to update the values.
Table 1: RF PDM Values at Power Level 5
Description/Field Reference Value
AGC1 -512
PA_Bias 129
PA_DC_DC 197
Pout at RF connector TBD dBm
Current TBD mA

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Cell Tx Setup
Use the following procedures to prepare for Cell 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.
3. Connect a power supply to the mobile terminal.
4. On the Phone Control dialog box, click the LOCAL button in the Phone State
area to put the mobile terminal into Local Mode. (See Figure 7 on page 13.)
5. Open the Troubleshooting menu, point to RF, and click RF Main Mode.
The RF Main Mode dialog box appears.
Figure 10: RF Main Mode dialog box for Cell Mode
6. Select the following values on the RF Main Mode dialog box:
•Band = Cell (CDMA)
•Channel = 384
•Mode = Rx/Tx
7. Click Set.
Note: Be sure that the “RF Main Mode set successfully” message appears in
the status bar.
8. Open the Troubleshooting menu, point to RF, and click CDMA Control.
The CDMA Control dialog box appears.

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Figure 11: CDMA Control dialog box for Cell Tx troubleshooting
9. 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
10. Click Execute.
11. Configure the spectrum analyzer using the following values:
• Center Frequency = 836.52 MHz
• Span = 100MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
Table 2: RF PDM Values
Description/Field Reference Value
AGC1 -130
PA_Bias 85
PA_DC_DC 110
Pout at RF connector +16dBm
Current 340mA
Do NOT select
this option

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Figure 12: RF PDM Control dialog box for Cell band
12. Click Read Phone to update the values.
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. (See Figure 7 on page 13.)
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 Figure 10 on page 15.)

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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 11 on page 16.)
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 -130
PA_Bias 85
PA_DC_DC 110
Pout at RF connector +15dBm
Current 340mA

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Figure 13: RF PDM Control dialog box for PCS band
14. Click Read Phone to update the values.
Transmitter RF Troubleshooting Procedures
After Phoenix is set up using either the AMPS, Cell, or PCS setup procedures, use the
following steps to troubleshoot the transmitter.
1. Using a voltmeter, check to see that all VR2, VR6, and VR1B are on the transmit
system. (See "Tx DC Test Points" on page 22.)
• If any are missing, look for SMD problems around the Tx IC and the UEMEK.
• If SMD is good, replace the UEMEK.
2. Once all DC voltages are present, check the AGC control voltages. (See "AMPS Tx
Setup"onpage12, "Cell Tx Setup"onpage15, or "PCS Setup"onpage17.)
• If the voltages are incorrect, check the SMD around TX_AGC1.
• If the SMDs are correct, replace the D2800.
3. Using an oscilloscope, check the I and Q input modulation wave forms at test
points. See "Tx DC test points of the PWB"onpage22. They should all be present
with an AC swing of about 500mVpp, with an offset of +1.2V.
• If one or more waveforms is missing, look for SMD problems around these
resistors.
• If the SMD is good, replace the UEMEK.
4. Use an AAS-10 RF probe to probe the Cell Tx output of the Tx IC.
• If there is no RF or low RF, look for a faulty SMD around the Tx IC.

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• If the SMD is okay, replace the N7000.
5. Probe the PA input.
• If the level is low, look for an SMD issue on the Tx filter.
• Reflow or replace the filter as necessary.
6. Probe the PA output.
• If the RF is missing or low, look for Vbatt voltages and SMD issues on and
around the PA.
• If these are okay, replace the PA.
7. Probe the duplexer output.
• If the RF is missing or low, reflow or replace the duplexer.
8. Probe the coupler output.
• If the RF is missing or low, reflow or replace the coupler.
9. Probe the diplexer output.
• If the RF is missing or low, reflow or replace the diplexer.
Failed Test: Tx PA Detector
Use the following steps if you encounter a failed test for the Tx PA detector:
1. Use Phoenix to set the mobile terminal into Local Mode and activate the Tx with
default output power.
2. The output power at the RF test connector should be 15dBm +/- 4dB. If not,
adjust the PDM values, or troubleshoot per procedure above.
3. Using a voltmeter on DC, probe the detector output at C7315. The voltmeter
should read approximately 1.4V. If not, replace N7302.