Nokia 6015 Service Manual 09RH55rf
Nokia Customer Care
6015/6015i/6016i/6019i (RH-55),
6012 (RM-20) Series Transceivers
Troubleshooting - RF
Issue 1 - Revision 002 09/2004 Company Confidential ©2004 Nokia Corporation
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Troubleshooting - RF Nokia Customer Care
Contents Page
RF Troubleshooting......................................................................................................................................... 5
Phone Components .....................................................................................................................................6
General Troubleshooting ...........................................................................................................................8
TX Power Low............................................................................................................................................. 8
Receiver Not Working Properly............................................................................................................. 8
Phone Cannot Make a Call..................................................................................................................... 8
Transmitter Parts .........................................................................................................................................9
Cell Transmitter Block Diagram......................................................................................................... 10
Transmitter Schematics ...........................................................................................................................11
Transmitter Troubleshooting Setup ......................................................................................................13
AMPS TX Setup....................................................................................................................................... 13
Cell TX Setup........................................................................................................................................... 14
PCS TX Setup........................................................................................................................................... 16
Transmitter Troubleshooting ..................................................................................................................17
Failed Test: TX PA Detector................................................................................................................. 18
TX DC Probe Points................................................................................................................................ 19
TX RF Probe Points................................................................................................................................. 21
Receiver Troubleshooting ........................................................................................................................22
Receiver Schematics ............................................................................................................................. 24
RF AGC Status......................................................................................................................................... 26
Turning on the RX Path........................................................................................................................ 27
Switching the RX Gain States............................................................................................................ 29
Cell Receiver Check from RF to IQ.................................................................................................... 29
PCS Receiver Check from RF to IQ.................................................................................................... 31
AMPS Receiver Check from RF to IQ................................................................................................ 32
Receiver Diagnostic Signal Tracing................................................................................................... 34
Receiver IF RF.......................................................................................................................................... 34
Receiver IF................................................................................................................................................ 35
Receiver DC.............................................................................................................................................. 37
Receiver Logic Input Voltages............................................................................................................ 38
Alfred (N750) Receiver Troubleshooting .............................................................................................39
Alfred DC Troubleshooting.................................................................................................................. 39
Synthesizer Troubleshooting ..................................................................................................................40
Incorrect PLL Frequencies.................................................................................................................... 40
Synthesizer Block Diagram ................................................................................................................. 41
Synthesizer Schematic ......................................................................................................................... 43
19.2 MHZ VCTCXO Reference Clock .....................................................................................................44
Measuring the AFC Voltage................................................................................................................ 45
VCTCXO Manual Tuning....................................................................................................................... 46
VCTCXO and UHF Synthesizer Probe Points .......................................................................................49
UHF Synthesizer Troubleshooting .........................................................................................................50
UHF Synthesizer Schematic................................................................................................................ 52
PCS UHF LO Channel 600 Spectrum................................................................................................. 53
Cell UHF LO Channel 384 Spectrum................................................................................................. 53
RX VHF LO ....................................................................................................................................................54
RX VHF LO (Batman) Schematic........................................................................................................ 55
TX UHF LO ....................................................................................................................................................56
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TX UHF LO Schematic ........................................................................................................................... 57
UHF PCS TX LO Spectrum .................................................................................................................... 59
UHF Cell TX LO Spectrum .................................................................................................................... 60
GPS RF Troubleshooting ..........................................................................................................................61
GPS Schematic........................................................................................................................................ 62
GPS RF General Testing ............................................................................................................................63
Self Test Failure...................................................................................................................................... 64
Oscillator Failure.................................................................................................................................... 64
CW Test Failure....................................................................................................................................... 64
GPS RF Probing ..........................................................................................................................................66
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RF Troubleshooting
When troubleshooting the receiver, first check the RX_AGC PDM value. The AGC value
should be close to the typical values (see "RF AGC Status" on page 26). The RX AGC tries
to keep a constant amplitude at the output of the receiver chain; if the AGC value
indicates an AGC gain that is substantially higher than normal, the AGC is compensating
for extra loss in another component. If the AGC PDM values are normal and there is still
a problem, check the actual AGC voltages. RF probing at specific locations in the chain
can then help to pinpoint the source of the problem.
Likewise, when troubleshooting the transmitter, first check the measured output power
and AGC values, which give an indication of where to start probing. Although probing
points and signal-level information are given for each point in the receiver and
transmitter chains, the troubleshooter is not expected to probe each point on every
phone — only the suspected trouble spots.
Absolute power measurements were made with an Agilent (HP) 85024A active highimpedance probe. Other probes can be used (but should be high-impedance so that the
measurement does not load the circuit) but may very well have a different gain;
therefore, adjust the absolute measurements accordingly. Also, adjust if using a probe
attenuator.
Where a range is given for loss, typically the higher loss occurs at the band edges.
Probing is not a very accurate method to measure absolute power; therefore, you cannot
expect measured results to exactly match the numbers listed here.
Power depends on the impedance of the circuit. For example, if a filter has a nominal loss
of 5 dB, then straightforward probing on the input and output, then subtracting, might
not result in 5 dB because the input impedance might be different from the output
impedance. Most components in the RF section have the same input and output
impedance (50 ohms), but where this is not the case, absolute power is noted in the
tables in dBm, rather than loss or gain in dB.
When testing the CDMA receiver, it is easier to inject a CW tone into the receiver. The
gains and losses are the same for a CW signal as for CDMA.
Note: After opening the shield lids, always replace them with new lids.
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Phone Components
Figures 1 and 2 illustrate the main components of the 6015/6015i/6016i/6019i, and
6012.
Cell RF connector
GPS RF Connector
GND
VBATT
BSI
Flash
SRAM
UPP
BB Connector
UI LEDs
UEM
Figure 1: Component layout (bottom)
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Audio ASIP
HS jack pads
Battery connector
PCS duplexer
Diplexer
Cell duplexer
PWR detector
Cell PW amp
Cell antenna pads HF speaker pads
Power switch
GPS shield
GPS CER filter
GPS antenna pads
GPS SAW filter
GPS LNA
GPS BB IC
GPS RF IC
GPS TCXO
SAW filter
LNA Alfred
SAW filter
VCTCXO
PCS PW amp
Jupiter RF TX
TX shield
RUIM connectors
Antenna
ground clip
Mic pads
UHF VCO
PLL synthesizer
RX shields
Batman RF RX
BI-DIR diode
ESD filter
Vibra pad
SM fuse
System
connector
diode
DC padsBI-DIR
Figure 2: Component layout (top)
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General Troubleshooting
Use the following steps to troubleshoot some common issues, such as low transmitter
power, a faulty receiver, or a phone that cannot make a call.
TX Power Low
If TX power is low, use Phoenix to turn on the transmitter in Local Mode and check the
following:
1. Perform a visual inspection of the PWB under a microscope to check for the
proper placement, rotation, and soldering of components.
2. Look for the presence of a CDMA modulated signal on a spectrum analyzer at the
correct frequency.
• If a signal is present but off-frequency or distorted, check the synthesizer.
Most likely, one of the synthesizers is not locked or the VCO has no output
signal.
• If a signal is not present, or present but low in amplitude, use check the
probing diagrams to determine where in the chain the fault occurs.
3. Check that the AGC PDMs are set for the desired TX power and ensure the AGC
voltages are correct.
4. Check the synthesizers for proper frequency and amplitude.
5. Ensure that the power supplies to the transmitter have the correct voltage.
Receiver Not Working Properly
If the receiver is not working properly, turn it on in Local Mode and check the following:
1. Turn on receiver with Phoenix and inject a signal.
2. Check the AGC PDM.
3. Perform a visual inspection of the PWB under a microscope to check for the
proper placement, rotation, and soldering of components.
4. Measure signal levels at various points in the chain and determine where in the
chain the fault lies.
5. Check the LOs for proper frequency and amplitude.
6. Ensure power supplies to receiver have correct voltage.
Phone Cannot Make a Call
Verify the following if the phone cannot make a call:
1. The phone is in Normal Mode (i.e., the phone is searching for a signal, net server
is on).
2. The Preferred Roaming List (PRL) is loaded into the phone.
3. The phone is tuned and has passed tuning. (Read the tuning parameters using the
batch tune component in Phoenix; an untuned phone has all zeros in the tuning
file.)
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4. The call box channel is set for a channel in PRL.
5. The SID is correct and entered into the phone.
6. The VCTCXO is centered as described in the VCTCXO tuning description on
page 49.
7. The transmitter and receiver are working properly in Local Mode.
Transmitter Parts
Following are the transmitter RF parts.
PCS PAPCS duplexer
PCS
coupler
PCS TX SAW filter
Diplexer
Cell
coupler
Cell
duplexer
Power detector
Cell PA
Figure 3: Transmitter parts
Cell TX SAW filter Jupiter TX IC
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Cell Transmitter Block Diagram
Following is the block diagram for the TX system.
Figure 4: TX system block diagram
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Transmitter Schematics
The following schematics are for general reference only. See the Schematics chapter for detailed versions.
Jupiter TX IC
TX LO lock voltage
Cell TX filter
PCS TX filter
Loop filter
Figure 5: Transmitter schematic 1
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PCS PA
PCS duplexer
Diplexer
Power detector
Couplers
Cell PA
Cell duplexer
Figure 6: Transmitter schematic 2
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Transmitter Troubleshooting Setup
Use the following sections to set up troubleshooting in Phoenix according to the band
you are using:
• "AMPS TX Setup"
• "Cell TX Setup"
• "PCS TX Setup"
AMPS TX Setup
Use the following procedures to prepare for AMPS TX troubleshooting using Phoenix.
1. Connect RF test connector to a call box.
2. Connect the phone 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 phone into Local Mode.
Figure 7: Phone Control dialog box
5. Open the Troubleshooting menu, point to AMPS, and click AMPS Control.
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The AMPS Control dialog box appears.
6. Click the Tx Control tab.
7. In the Set Channel field, type 384.
8. In the Power Level field, type 2.
9. Select the Transmitter ON option, and click Execute.
10. Configure the spectrum analyzer using the following values:
Cell TX Setup
Use the following procedures to prepare for Cell TX troubleshooting using Phoenix.
1. On the Phone Control dialog box, click the LOCAL button in the Phone State
Figure 8: AMPS Control dialog box
• Center Frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
area to put the phone into Local Mode. (See Figure 7 on page 13.)
2. Open the Troubleshooting menu, point to RF, and click RF Main Mode.
The RF Main Mode dialog box appears.
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3. Select the following values on the RF Main Mode dialog box:
• Band = Cell (CDMA)
• Channel = 384
• Mode = Rx/Tx
Figure 9: RF Main Mode dialog box
4. Click Set.
Note: Be sure that the “RF Main Mode set successfully” message appears in the status bar.
5. Open the Troubleshooting menu, point to RF, and click CDMA Control.
The CDMA Control dialog box appears.
Figure 10: CDMA Control dialog box for Cell TX troubleshooting
6. Select the following values 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.
7. Click Execute.
8. Open the Troubleshooting menu, point to RF, and click PDM Control.
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The RF PDM Control dialog box appears.
9. Click Read Phone to update the values.
10. Configure the spectrum analyzer using the following values:
PCS TX Setup
Use the following procedures to prepare for PCS TX troubleshooting using Phoenix.
1. Open the Troubleshooting menu, and point to Phone Control.
2. Click the LOCAL button in the Phone State area to put the phone into Local
3. Open the Troubleshooting menu, point to RF, and click RF Main Mode.
Figure 11: RF PDM Control dialog box for Cell troubleshooting
• Center Frequency = 836.52 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
The Phone Control dialog box appears.
Mode. (See Figure 7 on page 13.)
The RF Main Mode dialog box appears. (See Figure 9 on page 15.)
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4. Select the following values on the RF Main Mode dialog box:
• Band = PCS (CDMA)
• Channel = 600
• Mode = Rx/Tx
5. Click Set.
Note: Be sure that the “RF Main Mode set successfully” message appears in the status bar.
6. Open the Troubleshooting menu, point to RF, and click CDMA Control.
The CDMA Control dialog box appears. (See Figure 10 on page 15.)
7. Select the following values 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.
8. Click Execute.
9. Open the Troubleshooting menu, point to RF, and click PDM Control.
The RF PDM Control dialog box appears. (See Figure 11 on page 16.)
10. Click Read Phone to update the values.
11. Configure the spectrum analyzer using the following values:
• Center Frequency = 1880 MHz
• Span = 100 MHz
• Amplitude = 20 dBm
• Attenuation = Auto
• BW = Auto
Transmitter Troubleshooting
After Phoenix is set up using either the AMPS, Cell, or PCS setup procedures, use the
following steps to troubleshoot the transmitter.
1. Use a voltmeter to verify that the VR2, VR6, and VR1B are on the transmit
system. (See Figure 13 on page 19 and Figure 14 on page 20).
• If any are missing, look for SMD problems around Jupiter and the UEM.
• If the SMD is good, replace the UEM.
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2. If all DC voltages are present, check the AGC control voltages. (See Figure 13 on
page 19).
• If the voltages are incorrect, check the SMDs around the TX_AGC1 and
TX_AGC2 lines.
• If SMDs are all good, replace the UPP.
3. Using an oscilloscope, look at the input modulation waveforms on R603, R604,
R605, and R606. They should all be present with an AC swing of about 500 mVpp
and a +1.2 V offset.
• If one or more waveforms are missing, look for SMD problems around these
resistors.
• If the SMD is good, replace the UEM.
4. Probe the Cell TX output of Jupiter using AAS-10 type RF probe.
5. Use the spectrum analyzer to probe the RF center frequency (see the "AMPS TX
Setup", "Cell TX Setup", or "PCS TX Setup" section for the correct spectrum
analyzer settings).
• If there is no RF or low RF, look for faulty SMD around the Jupiter chip.
• If the SMD is good, replace the Jupiter chip.
6. Probe the PA input. If level is low, look for an SMD issue on the TX filter. Reflow
or replace the filter as necessary.
7. 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 voltages are good, replace the PA.
8. Probe the duplexer output. If the RF is missing or low, reflow or replace the
duplexer.
9. Probe the coupler output. If the RF is missing or low, reflow or replace the
coupler.
10. Probe the diplexer output. If the RF is missing or low, reflow or replace the
diplexer.
Failed Test: TX PA Detector
1. Use Phoenix to set the phone in Local Mode, and activate the TX with default
output power. The output power at the RF test connector should read
9 dBm +/- 4 dB.
2. Use a voltmeter on DC, and probe the detector output at C813. The voltmeter
should read approximately 1.4 V. If not, replace the detector (N803).
See Figure 13 on page 19 for test point location and common power and voltage
variations.
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Good output
Figure 12: The output of the phone on a spectrum analyzer should look like the figure on the left
Bad output
If using the AAS-10 probe with the phone connected to the call box, the amplitude
should be approximately -7 dBm at the antenna test point on the top of the PWB.
TX DC Probe Points
Following are the transmitter DC probe points on the top side of the PWB. See Table 1 on
page 20 for test point descriptions and values.
1
2
4
3
5
6
7
8
10 9
Figure 13: Top side TX DC test points
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11
16
12
13
Figure 14: Bottom side TX DC probe points
14
15
Table 1 shows the TX DC probe points for the bottom and top sides of the PWB.
Table 1: TX DC Probe Points
Test Point Description Value
1 Power detector VR2 2.76V
2 Vbatt PCS*
3 AGC 2 0.1 to 1.8V
4 AGC 1 0.1 to 1.8V
5 TX IQ IN
TX IQ IN with oscilloscope
6VR6 2.8V
7VR1B 4.8V
8 TX UHF LO lock voltage 1.2V
9 Vbatt Cell*
10 Power detector output PCS:
11 V re fR F 1 1 .4 5 V
Approximately 1. 2V
Approximately 500 mV p-p
1.9V at <5dBm
1.6V at 15dBm
0.8V at 25dBm
Cell:
1.9V at <5dBm
1.7V at 15dBm
1.3V at 25dBm
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Table 1: TX DC Probe Points (Continued)
Test Point Description Value
12 VR6 2.78V
13 VR1B 4.7V
14 VR2 2.78V
15 Vbatt* 3.2 to 4.7V
16 TX detector out Approximately 1.5V
Note: Vbatt also appears at the outputs of the PAs.
TX RF Probe Points
Following are the TX RF probe points.
21
3
4
14
13
12
11
10
89
Figure 15: TX RF test points
7
Table 2 includes the values from the test points in Figure 15. The PCS frequency is at
1880 MHz, and the Cell/AMPS frequency is at 836.25 MHz.
Table 2: TX RF Probe Points
Test Point Description Value
5
6
1 PCS duplexer out -2 dBm
2 PCS PA out -2 dBm
3 PCS PA in -23 dBm
4 PCS Jupiter out -22 dBm
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