Nokia 2125 Istruzioni operative
Nokia Customer Care
2125/2125i/2126/2126i/2128i (RH-71)
Mobile Terminals
ISSUE 1 08/2005 Company Confidential ©2005 Nokia Corporation
RF Description and
Troubleshooting
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Page 2 ©2005 Nokia Corporation Company Confidential ISSUE 1 08/2005
Contents Page
Component Layouts ....................................................................................................................................... 3
Phoenix Setup.................................................................................................................................................. 5
Tx Troubleshooting......................................................................................................................................... 7
Main Tx Components ..................................................................................................................................7
Cell Transmitter Block Diagram ...............................................................................................................8
Tx DC Test Points .........................................................................................................................................9
Tx RF Test Points ........................................................................................................................................11
TX DC Test Points .......................................................................................................................................13
Receiver Troubleshooting .......................................................................................................................... 15
Rx System Block Diagram .......................................................................................................................15
Cell Receiver Check from RF to IQ ........................................................................................................16
PCS Receiver Check from RF to IQ .......................................................................................................17
AMPS Receiver Check from RF to IQ ...................................................................................................19
Receiver DC Test Points ...........................................................................................................................21
Receiver RF Test Points ............................................................................................................................22
Receiver IF Test Points .............................................................................................................................25
Receiver Logic Input Voltages............................................................................................................ 27
Synthesizer Troubleshooting .................................................................................................................... 28
Incorrect PLL Frequencies .......................................................................................................................28
Synthesizer Block Diagram .....................................................................................................................29
19.2 MHZ VCTCXO Reference Clock .....................................................................................................30
Measuring the AFC Voltage................................................................................................................ 30
VCTCXO Manual Tuning....................................................................................................................... 31
VCTCXO Test Points ...................................................................................................................................35
Receiver UHF Synthesizer ........................................................................................................................36
Rx VHF LO ....................................................................................................................................................39
Rx VHF LO (N7100) Schematic .......................................................................................................... 40
Tx UHF LO ....................................................................................................................................................41
TX UHF LO Schematic ........................................................................................................................... 42
GPS RF Troubleshooting ..........................................................................................................................44
GPS RF General Testing ............................................................................................................................45
Self-test Failure...................................................................................................................................... 46
Oscillator Failure.................................................................................................................................... 46
CW Test Failure....................................................................................................................................... 46
GPS RF Test Points ....................................................................................................................................48
Nokia Customer Care RF Description and Troubleshooting
2125/2125i/2126/2126i/2128i (RH-71)
ISSUE 1 08/2005 ©2005 Nokia Corporation Company Confidential Page 3
Component Layouts
Figure 1 and Figure 2 show the main components of the 2125/2125i/2126/2126i/2128i.
Figure 1: Component layout (top)
Cell RF connector
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Page 4 ©2005 Nokia Corporation Company Confidential ISSUE 1 08/2005
Figure 2: Component layout (bottom)
Diplexer
VCO
Cell duplexer
N7100 Rx
downconverter
GPS LNA
PCS Rx SAW
GPS RF connector
GPS TCXO
PCS duplexer
Cell Rx SAW filter
Cell PA
CDMA IF
SAW filter
VCTCXO
PCS PA
AMPS IF
XTal filter
Cell Tx filter
GPS RF filter (1)
Synthesizer IC
PCS Tx filter
N7160 Rx
front-end IC
Tx upconverter GPS RF filter (2)
Nokia Customer Care RF Description and Troubleshooting
2125/2125i/2126/2126i/2128i (RH-71)
ISSUE 1 08/2005 ©2005 Nokia Corporation Company Confidential Page 5
Phoenix Setup
Use the following steps to configure Phoenix for RF troubleshooting.
1. Connect RF test connector to a call box.
2. Connect the mobile terminal to a PC via the bottom connector, and connect a
power supply.
3. Open the Troubleshooting menu, and click Phone Control.
The Phone Control dialog box appears.
4. On the Phone Control dialog box, click the LOCAL button in the Phone State
area to put the mobile terminal into Local Mode.
Figure 3: Phone Control dialog box
5. Use Table 1, “Phoenix Configuration,” on page 6 to continue Phoenix
configuration based on the band type.
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting Nokia Customer Care
Page 6 ©2005 Nokia Corporation Company Confidential ISSUE 1 08/2005
Table 1: Phoenix Configuration
Cell PCS AMPS
1. On the RF Main Mode dialog box:
• Band = Cell (CDMA)
• Channel = 384
• Mode = Rx/Tx
2. Click Set. Be sure that the “RF Main Mode set successfully”
message appears in the status bar.
3. On the CDMA Control dialog box:
• State = Rho ON
• Band = Cell
• Radio Configuration = Mode 1: IS-95 Voice
• Select the Set default PDM values check box.
4. Click Execute.
5. Configure the spectrum analyzer using the following values:
• Center frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
6. Open the RF PDM Control dialog box, and click Read Phone.
Ensure the following values:
• Tx AGC1 = 0
• Tx AGC2 = -512
• PA Gain = 114
• Pout = +16 dBm
• Current = 360 mA
• Pout with AAS-10 at antenna connection = -8 dBm
1. On the RF Main Mode dialog box:
• Band = PCS (CDMA)
• Channel = 600
• Mode = Rx/Tx
2. Click Set. Be sure that the “RF Main Mode set successfully”
message appears in the status bar.
3. On the CDMA Control dialog box:
• State = Rho ON
• Band = PCS
• Radio Configuration = Mode 1: IS-95 Voice
• Select the Set default PDM values check box.
4. Click Execute.
5. Configure the spectrum analyzer using the following values:
• Center frequency = 1880 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
6. Open the RF PDM Control dialog box, and click Read Phone.
Ensure the following values:
• Tx AGC1 = 0
• Tx AGC2 = -512
• PA Gain = 207
• Pout = +8 dBm
• Current = 300 mA
• Pout with AAS-10 at antenna connection = -8 dBm
1. On the AMPS Control dialog box:
• Click the Tx Control tab.
• In the Set Channel field, type 384.
• In the Power Level field, type 2.
• Select the Transmitter ON option
2. Click Execute.
3. Configure the spectrum analyzer using the following values:
• Center Frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
4. Open the RF PDM Control dialog box, and click Read Phone.
Ensure the following values:
• Tx AGC1 = 0
• Tx AGC2 = -512
• PA Gain = -200
• Pout = +17 dBm
• Current = 370 mA
• Pout w/ AAS-10 at antenna connection = -8 dBm
2125/2125i/2126/2126i/2128i (RH-71)
Nokia Customer Care RF Description and Troubleshooting
ISSUE 1 08/2005 ©2005 Nokia Corporation Company Confidential Page 7
Tx Troubleshooting
Main Tx Components
Figure 4: Tx components
PCS TX SAW filter PCS PA
PCS
duplexer
PCS
coupler
Cell duplexer Cell coupler
Power
detector
Cell PACell TX SAW filter
N7000 TX IC
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting Nokia Customer Care
Page 8 ©2005 Nokia Corporation Company Confidential ISSUE 1 08/2005
Cell Transmitter Block Diagram
Figure 5: Tx system block diagram
2125/2125i/2126/2126i/2128i (RH-71)
Nokia Customer Care RF Description and Troubleshooting
ISSUE 1 08/2005 ©2005 Nokia Corporation Company Confidential Page 9
Tx DC Test Points
Figure 6: Tx DC test points
4
5
2
1
6
VBATT PCS 7 8
3
VBATT Cell
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Page 10 ©2005 Nokia Corporation Company Confidential ISSUE 1 08/2005
Table 2 shows the Tx DC test points shown in Figure 6.
Table 2: Tx DC Test Points
Test Point Description Value
1 AGC 1 From 0.1 to 1.8 V
2 AGC 2 From 0.1 to 1.8 V
3 VR6 2.8 V
4 Tx UHF LO lock voltage 1.2 V
5VR1B 4.8V
6 Tx IQ in 1.2 V
With oscilloscope: 500 mV p-p
7 VR2 (power detector) 2.76 V
8 Power detector output PCS:
• 1.9 V at < 5 dBm
• 1.6 V at 15 dBm
• 0.8 V at 25 dBm
Cell:
• 1.9 V at < 5 dBm
• 1.7 V at 15 dBm
• 1.3 V at 25 dBm
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