Nokia 3570, 3585 Service Manual 8 npd1troubleRF

CCS Technical Documentation

NPD-1 Series Transceivers

Troubleshooting — RF

Issue 1 11/2002 Confidential Nokia Corporation

NPD-1

Troubleshooting — RF CCS Technical Documentation

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CCS Technical Documentation Troubleshooting — RF

Contents

Page No

RF Troubleshooting ....................................................................................................... 5

Tuning Descriptions....................................................................................................... 8

ST Batman VHFPLL ...................................................................................................8

ST TX Detector Cell ....................................................................................................9

ST Robin VHFPLL Cell ............................................................................................10

ST TX Detector PCS .................................................................................................10

ST Robin VHF PLL PCS ...........................................................................................11

SN Cell PA Temp ......................................................................................................11

SN Cell RX BB Filter ................................................................................................12

SN Cell RX DC Offset I (or Q) .................................................................................12

SN AMPS RX BB Filter ............................................................................................12

SN AMPS RX DC Offset I (or Q) .............................................................................13

Test TX Start up Current ...........................................................................................13

Test TX Start up Amplitude ......................................................................................13

TN VCTCXO Frequency ..........................................................................................13

TN TX DC Offset Reference Power ..........................................................................15

TN TX DC Offset Carrier Suppression .....................................................................16

TN TX IF AGC Cell Po (0) [or (1), (2), (3), or (4)] ...............................................17

TN PA Gain Cal Cell Po (0) [or, (1), (2), (3), (4), or (5)] ......................................18

TX TX IF 11 dBm Set CELL Po ...............................................................................19

TN TX RF AGC Cell Po (0) [or (1), or (2)] ...........................................................19

TN TX Gain Comp Cell (or PCS) Po MD (or LO, LM, ML, MH, HM, or HI) ........20

TN G_Offset Cell MD ...............................................................................................21

TN AMPS PL2 Po Mid (or Low, LowMid, MidLow, MidHigh, HighMid, or High) 21

TN AMPS PL3 (or 4, 5, 6, or 7) Po ...........................................................................22

TN PA Gain Cal PCS Po (0) [or (1), (2), (3), (4), or (5)] .......................................22

TN TX IF 11 dBm Set PCS Po ..................................................................................22

TN TX RF AGC PCS Po (0) [or (1), or (2)] ...........................................................22

TN TX Limiting Po Cell (or PCS) IS95, Low channel (or LowMid, MidLow, Mid,

MidHigh, HighMid, or High channel) .....................................................................23

TN TX Limiting Cell (or PCS) CDMA2000: Po ......................................................23

TS ACPR PCS- Low (High) ......................................................................................24

TN PA Detector PCS Po (0) [or (1), (2), (3), (4), (5), (6), or (7)] .........................25

TS ACPR Cell - Low .................................................................................................26

TN RX IF AGC RXdBCtr (0) [or (1) or (2)] ..........................................................26

TN LNA AMPS (or Cell or PCS) LowGain (or HighGain) LO (or LM, ML, MD,

MH, HM, HI) ...........................................................................................................27

Final UI test: Rho .......................................................................................................27

Final UI test: Frame Error Rate (FER) ......................................................................28

Final UI test: SINAD .................................................................................................28

Probing/Troubleshooting Tables and Diagrams .......................................................... 28

Transmitter Probing................................................................................................. 29

Receiver Probing..................................................................................................... 34

RF Power Supplies.................................................................................................. 40

Probing Diagrams ................................................................................................... 41

APPENDIX A: Phoenix Instructions........................................................................... 45

To turn on the PCS or Cell CDMA transmitter....................................................... 45

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To turn on the AMPS transmitter............................................................................ 46

To turn on the receiver only, in any mode .............................................................. 48

To verify a single, manual tuning............................................................................ 48

To adjust PDM values of AGCs and AFC.............................................................. 48

To read tuning values from the phone..................................................................... 49

To read RSSI and AGC PDM values from the phone............................................. 49

To load a PRL into the phone.................................................................................. 50

To change between Local and Normal modes ........................................................ 50

To add a baseband test tone to the AMPS transmitter............................................ 51

APPENDIX B: Definitions.......................................................................................... 52

APPENDIX C: Block Diagrams.................................................................................. 53

APPENDIX D:

Descriptions of selected components, signaling, and architecture ........................ 58

Robin (N601) Key Features .................................................................................... 58

Robin (N601) Signaling.......................................................................................... 58

Batman (N701) Key Features.................................................................................. 59

Batman (N701) Signaling........................................................................................ 60

PA Key Features: Shark (N801, Cell) and Snapper (N802, PCS) .......................... 60

LNA/Downconverter (N750) Key Features............................................................ 60

APPENDIX E: AGC Algorithms................................................................................. 61

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RF Troubleshooting

If TX power is low, turn on transmitter in local mode using Phoenix. Check:

• current (0.7 – 1 A for max power, mode and channel dependent.)

• perform visual inspection of PWB under microscope to check proper
placement, rotation, and soldering of components

• Look for presence of TX signal on spectrum analyzer at the correct fre­quency. If signal is n ot on frequen cy, check in 100 MHz span . If signal is
present but off frequency, check synthesizer. If signal is not present, or
present but low in amplitude, use probing Tables 1 through 5 to deter­mine where in the chain the fa ult occur s, wi th AG C PD Ms set for know n
transmit power as listed in Table 1

• Check that AGC PDMs are set for desired TX power according to
Tables 1 and 3, and ensure that AGC voltages are correct

• according to Tables 2 (cell/AMPS) and 4 (PCS), check the LOs for
proper frequency and amplitude

• ensure power supplies to transmitter have correct voltage, as per
Table 12

If Receiver is not working properly, turn on transmitter in local mode and check:

• turn on receiver with Phoenix, inject a signal into the receiver

• check the RSSI level and AGC PDM according to Table 6

• perform a visual inspection of the PWB under a microscope to check
proper placement, rotation, and so ldering of components

• use probing Tables 6 through 11 to measure signal levels at various
points in the chain and determine where in the chain the fault lies

• according to tables 3a through 4b, check the LOs for proper frequency
and amplitude

• ensure power supplies to receiver have correct voltage as per Table 5

If phone won’t make a call:

• ensure phone is in n orm al mod e ( i.e., ensure t he ph one i s sea rchin g for
a signal, i.e., net server is on).

• ensure Preferred Roaming List (PRL) is loaded into phone

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• ensure phone is tuned (read tuning parameters using Batch Tune com­ponent in Phoenix, an untuned phone will have all zeros in tuning file),
and has passed tuning

• ensure call box channel is set for a channel in PRL, and ensure SID is
correct

• ensure MIN, MDN, and SID are entered into the phone

• ensure VCTCXO is centered, as described in VCTCXO tuning descrip­tion below

• ensure transmitter and receiver are working properly by checking them
in local mode.

To troubleshoot the antenna circuits, refer to document DHK00086-EN by Tim Mcgaf-

figan.

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Figure 1: Eagle PWB bottom (general placement)

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Figure 2: Eagle PWB top (general placement)

Tuning Descriptions

NOTE: Pass/Fail limits are not provided in this document as they may be changed.

ST Batman VHFPLL

This is one of the phone’s self tests, which gives either a “pass” or “fail” result only. The
VHFPLL is inside the Batman IC. The phone checks the VHFPLL’s lock detect bit. If this bit
indicates that the PLL is unlocked, the test will fail.

Manual Verification: Turn on the Cell or PCS receiver to any channel and probe at L701
(probing point 39 in Figure 6) using an RF probe connected to a spectrum analyzer tuned
to 256.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked, you may
have to use a wide span to see it since it may be far off frequency.

Troubleshooting: First check that V701 has the proper orientation, then check C701,
C714, R703, R702, C715, R704, C716, L701, and C702. Also check power supplies to Bat­man, particularly check for 2.7v on VR5 at C710, and on VR7 at C708, and check for 1.8v
on VIO. If no fault is found, replace N701 (Batman).

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ST TX Detector Cell

This is one of the phone’s self tests which gives either a “pass” or “fail” result only. The
phone transmits at several power levels and checks the ADC value of the power detector.
The ADC value is measured first for a set of AGC values, then each AGC value is changed
one at a time to make sure that the ADC changes as each AGC is changed individually.

Manual Verification:

Using Main Mode: Turn on the Cell CDMA TX with channel set to 384, and turn on IS95
modulation using CDMA control.

Using the PDM window, set:

TX_IF_AGC to – 100
TX_RF_AGC to –512
PA_AGC to +511.

Record the TX signal power from the antenna connector using a spectrum analyzer cen­tered at 836.52 MHz. (The selftest measures the power detector reading instead, but at
the present time this cannot be done with Phoenix; therefore, an easy way to check
functionality without removing the covers is to check transmitted power. If the covers
are removed, the voltage on PWR_OUT, at probing point 48 in Figure 1, can be mea­sured). Transmitted power should be greater than 24 dBm. (PWR_OUT greater than 1.91v,
which corresponds to the power detector ADC=700).

For each of the next three cases, TX power should be less than 24 dBm (less than 1.91v
on PWR_OUT).

(1) TX_IF_AGC to – 80

TX_RF_AGC to -512,
PA_AGC to -512.

(2) TX_IF_AGC to +511,

TX_RF_AGC to -512,
PA_AGC to +511.

(3) TX_IF_AGC to -80

TX_RF_AGC to +511
PA_AGC to +511.

Troubleshooting: If there is a failure associated with only some of the cases above, check
the AGC voltages and components of the associated PDMs as described in Tables 1 and 3.
For problems with the IF or RF AGC, also check Robin and supporting components. For PA
AGC problems, also check the PA and supporting components. If all of the above cases
fail, troubleshoot the TX chain as described in the Probing Diagrams section. If all the
output powers are passing, then perhaps the test is failing because the ADC voltage is
wrong (which at this point we cannot read, so we are measuring the actual output
power). This can be verified by measuring the voltage on the PWROUT probing point 48

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in Figure 10. The limit is 1.6v. If the voltages are wrong, check the power detector at
R821, R801, R804, L801, C805, R806, R805, C803, V801, C804, R803, and C807, and also
Robin. If the voltages are correct and it still fails, check the UEM D200.

ST Robin VHFPLL Cell

This is one of the phone’s self tests which gives either a “pass” or “fail” result only. The
VHFPLL is inside the Robin IC. The phone checks the VHFPLL’s lock detect bit. If this bit
indicates that the PLL is unlocked, the test will fail.

Manual Verification: Turn on the Cell CDMA receiver to any channel and probe at L611
(probing point 11a in Figure 5) using an RF probe connected to a spectrum analyzer
tuned to 346.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked,
you may have to use a wide span to see it since it may be far off frequency.

Troubleshooting: First check that V601 and V602 have the proper orientation, then check
C612, C613, R607, R605, C632, R606, C638, L611, C631, C630, C629, C637, R609, C618,
and R613. Check power supplies to N601 (Robin), and ensure there is 2.7v on VR3 and
VR6, and 1.8v on VIO (Table 12 and Figure 9). If no problems are found, replace Robin.

ST TX Detector PCS

This is one of the phone’s self tests which gives either a “pass” or “fail” result only. The
phone transmits at several power levels and checks the ADC value of the power detector.
The ADC value is measured first for a set of AGC values, then each AGC value is changed
one at a time to make sure that the ADC changes as each AGC is changed individually.

Manual Verification:

Using Main Mode: Turn on the PCS CDMA TX with channel set to 600. Turn on IS95 mod­ulation using CDMA control.

Using the PDM window, set:

TX_IF_AGC to –150
TX_RF_AGC to –512
PA_AGC to +511

Record the TX signal power from the antenna connector using a spectrum analyzer cen­tered at 1880 MHz. (The selftest measures the power detector reading instead, but at the
present time this cannot be done with Phoenix; therefore, an easy way to check func­tionality without removing the covers is to check power out. If the covers are removed,
the voltage on PWROUT, at probing point 48 in Figure 10, can be measured). Transmitted
power for the above case should be greater than 24 dBm. (PWR_OUT greater than 1.09v,
which corresponds to the power detector ADC=400).

For each of the next three cases, TX power should be less than 24 dBm (less than 1.09v
on PWR_OUT):

(1) TX_IF_AGC to – 80

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TX_RF_AGC to -512
PA_AGC to -512.

(2) TX_IF_AGC to +511

TX_RF_AGC to -512
PA_AGC to +511

(3) TX_IF_AGC to -80

TX_RF_AGC to +511
PA_AGC to +511

Troubleshooting: If there is a failure associated with only some of the cases above, check
the AGC voltages and components of the associated PDMs as described in Tables 1 and 5.
For problems with the IF or RF AGC, also check Robin and supporting components. For PA
AGC problems, also check the PA and supporting components. If all of the above cases
fail, troubleshoot the TX chain as described in the Probing Diagrams section. If all the
output powers are passing, then perhaps the test is failing because the ADC voltage is
wrong (which at this point we cannot read, so we are measuring the actual output
power). This can be verified by measuring the voltage on the PWROUT, at probing point
48 in Figure 10. The limit is 1.09 v. If the voltages are wrong, then check the power
detector at R821, R801, R804, L801, C805, R806, R805, C803, V801, C804, R803, and
C807, and also Robin. If the voltages are correct and it still fails, check the UEM (D200).

ST Robin VHF PLL PCS

This is one of the phone’s self tests which gives either a “pass” or “fail” result only. The
VHFPLL is inside the Robin IC. The phone checks the VHFPLL’s lock detect bit. If this bit
indicates that the PLL is unlocked, the test will fail.

Manual Verification: Turn on the PCS CDMA receiver to any channel and probe at L611
(probing point 11a in Figure 5) using an RF probe connected to a spectrum analyzer
tuned to 416.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked,
you may have to use a wide span so see it since it may be far off frequency.

Troubleshooting: First check that V610 and V602 have the proper orientation, then check
C612, C613, R607, R605, C632, R606, C638, L611, C631, C630, C629, C637, R609, C618,
and R613. Check power supplies to N601 (Robin) and ensure there is 2.7v on VR3 and
VR6, and 1.8v on VIO (Table 12 and Figure 9). If no problems are found, replace Robin.

SN Cell PA Temp

This is one of the phone’s self tunings, which reads the ADC voltage of a thermistor
R808, and checks to make sure the phone is at room temperature. The reason for this is
that we don't want to tune a phone while it's hot or cold.

The phone reports the ADC voltage value of the thermistor, and it should be within the
limits.

Manual Verification: Ensure the phone is cool by letting it cool down for several minutes,
and retest, keeping in mind that if there is a short circuit on the board, then it will get

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hot very quickly.

Troubleshooting: If the phone was recently transmitting in Cell band at full power for an
extended period of time, it is probably hot for that reason. Let it cool down for a few
minutes, then try again. If it still fails, there may either be a short on the board or else a
problem with the PA Temp circuitry. To check PA Temp circuitry, check R808, C232,
R202, and D200. If a short is suspected, check the cell PA first. If an infrared camera is
available, this is one of the easiest methods to detect a short.

SN Cell RX BB Filter

This is one of the phone’s self tunings, which tunes the lowpass filter in the Batman IC
N701, in cell CDMA mode.

This self tuning returns one of the filters tuned parameters, which should be within the
limits.

Manual Verification: Use RF Tuning window in Phoenix, set mode to “self tune” and
choose this tuning.

Troubleshooting: Check Batman (N701) and supporting components.

SN Cell RX DC Offset I (or Q)

This is one of the phone’s self tunings, which measures and adjusts the cell band CDMA
receiver DC offsets until they are within the limits.

The DC offset is returned for I (or Q).

Manual Verification: Use RF Tuning window in Phoenix, set mode to “self tune” and
choose this tuning.

Troubleshooting: Check Batman (N701) and supporting components.

SN AMPS RX BB Filter

This is one of the phone’s self tunings, which tunes the lowpass filter in the Batman IC
(N701) in AMPS mode.

This self tuning returns one of the filters tuned parameters, which should be within the
limits.

Manual Verification: Use RF Tuning window in Phoenix, set mode to “self tune” and
choose this tuning.

Troubleshooting: Check Batman (N701) and supporting components.

SN AMPS RX DC Offset I (or Q)

This is one of the phone’s self tunings which measures and adjusts the cell band AMPS
receiver DC offsets until they are within the limits.

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The DC offset is returned for I (or Q).

Manual Verification: Use RF Tuning window in Phoenix, set mode to “self tune” and
choose this tuning.

Troubleshooting: Check Batman (N701) and supporting components.

Test TX Start up Current

This test turns on the AMPS transmitter (PCS transmitter for PCS-only phones) and mea­sures current of the whole phone, which can detect some assembly errors.

Manual Verification: Set the phone to local mode and turn on the AMPS transmitter. Set
the PDM values as listed in Table 1 for AMPS Power Level 5 (for PCS, set output power to
+12 dBm). Read the phone’s current on the power supply and check to see that it is
within the limits. If the power supply does not display current draw, use a current meter
in series with the phone. If the phone powers down when the mode is set, it may be that
the phone is drawing more current than the current limit setting on the power supply.

Troubleshooting: If current is very high, there may be a short circuit on the phone caused
by a solder bridge, a failed component that is internally shorted, a component placed
with the wrong rotation (which shorts two nodes that shouldn’t be), or some other rea­son. Short circuits can be difficult to find, but one of the easiest methods is to use a
thermal camera and look for hot spots that are not normally hot, and look for the hottest
spots. A visual inspection can find solder bridges or wrong component rotations. A failed
component can be found by functional tests of the phone’s sub-blocks.

Test TX Start up Amplitude

This test turns on the AMPS transmitter (PCS transmitter in PCS-only phones) and checks
for the presence of a TX signal with an amplitude within a specified range. A wide range
is allowed since the transmitter is not yet tuned.

Manual Verification: Set the phone to local mode and turn on the AMPS transmitter set
to channel 384. Set the AGC PDM values as in test 17. Look for an output signal at

836.52 MHz with an amplitude within the limits. The frequency of the signal may not be
accurate since the VCTCXO has not yet been tuned.

Troubleshooting: Check proper placement, rotation, and soldering of the components in
the TX chain, as shown in Figure 5. Check for the presence of LO tones as listed in
Table 2. Check for presence of a TX signal at each point in the TX chain, probing accord­ing to Table 2.

TN VCTCXO Frequency

The purpose of this tuning is to determine what the AFC DAC value needs to be in order
to center the VCTCXO frequency. The PCS transmitter is turned on and no TX baseband
modulation is provided. The carrier is then centered in frequency. This is done to the car­rier after it has been mixed up to 1880 MHz, since it’s easier to measure the tolerance of
1 ppm at 1880 MHz than it is at 19.2 MHz. Additionally the tone at 1880 MHz can be

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measured without taking the phone apart.

The result is a PDM value for the AFC DAC, which must be within +/- 150, which corre­sponds to 2.2 v on the VCTCXO control pin (pin 1) and the carrier centered within
+/- 100Hz. The VCTCXO must be able to be centered within a certain voltage range in
order to allow for aging of the crystal (the centering voltage slowly drifts over time and
the phone will eventually run out of voltage range if it begins too close to the edge of
the range).

Manual Verification: Using the RF Main Mode window in Phoenix, turn on the PCS trans­mitter, and set it to channel 600. Do not add any modulation.

Using the RF Tuning window, set mode=RF Tuning and choose this tuning. Look for a
transmitted tone on the spectrum analyzer at 1880 MHz. If no tone is present, proceed
to Troubleshooting section.

Center the carrier to within +/- 100 Hz of 1880 MHz. (If sidetones are present, be careful
to center the carrier and not one of the sidetones, which will probably have a higher
amplitude than the carrier.) The values you enter in the “values” edit box are the AFC val­ues which control the VCTCXO frequency. Start with a value of 0, then adjust until it is
centered, staying within the limits.

Troubleshooting:

1) If there is no tone, probe pin 3 of G501 for a tone at 19.2 MHz. If this is not present
check power supplies, particularly ensure 2.7v on VCTCXO Vcc pin, pin 4 of G501. Also
check the control pin, pin 1 of G501, for a voltage between 0.4 and 2.7 v. If the voltages
are correct, and soldering of all G501 terminals is correct, replace G501. If 19.2 MHz tone
is present but tone at 1880 MHz is not, troubleshoot PCS TX chain as described in the
Probing Diagrams section.

2) If the carrier is present but the PDM needed to center it is outside of the +/- 150
range, or if it cannot be centered, there is a hardware problem.

3) In the following procedure, performing frequency centering on the RF carrier at
1880 MHz will detect frequency errors due to the VCTCXO and supporting hardware,
which will be the majority of the problems, but will not detect frequency errors due to
the hardware that mixes the VCTCXO tone at 19.2 MHz up to 1880 MHz. In order to
troubleshoot this hardware also, frequency centering should be performed on the

19.2 MHz tone to +/- 19.2 Hz on pin 3 of G501 using a frequency counter, then the VHF
and UHF LOs should be checked. Since this will be time-consuming and will probably
only account for a small percentage of the failures, it is not recommended unless the sit­uation justifies the time spent. The VHF LO is inside the Robin IC (N601) and trouble­shooting of the cell UHF LO is according to Table 2.

4) If the carrier can be centered but the PDM is out of range, check the control voltage
on pin 1 of G501. If it is 2.2v, (and pin 4 is at 2.7v, and pin 2 at 0v), then the VCTCXO
(G501) is working correctly but the circuit that delivers the control voltage is not. Check

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soldering of all G501 terminals; also check R510, R511, C503, and D200. If the control
voltage on pin 1 of G501 is not 2.2v, but the carrier is centered, then there is a problem
with the VCTCXO G501. If there is 2.7v on pin 4 and the soldering is correct, then replace
G501.

5) If the carrier cannot be centered, check to see if you can adjust to 2.2v on pin 1 of
G501. If you can, within the PDM range of +/- 150, then the circuitry that delivers the
voltage is working correctly, and the VCTCXO has a problem. Troubleshoot it as described
in the previous section. If you cannot adjust to 2.2v within the accepted range, then the
AFC circuitry has a problem. Troubleshoot it as described in the previous section.

6) In cases where there is a fault with both the AFC circuitry and the VCTCXO, several
combinations of the previously described conditions are possible. Start by ensuring 2.2v
on pin 1 of G501 using a PDM within the range +/- 150, then center the tone.

TN TX DC Offset Reference Power

The DC offset voltages on the I and Q inputs to the modulator are adjusted for minimal
carrier feedthrough (maximum carrier suppression). Initially the DC offsets are set to a
nominal value, and the power of a tone offset in frequency 20 kHz from the carrier is
measured in dBm and recorded as a reference (in this tuning). Then in the next tuning,
the carrier suppression (delta between center tone and tone that is offset 20 kHz) is
measured. If it passes, it is reported in that tuning. If not, the DC offsets are adjusted
until it passes, and the passing value is reported.

The reported result is the power in dBm of the tone that is offset 20 kHz from the carrier,
as measured on the antenna connector, with the nominal DC offsets applied.

Manual Verification:

In Phoenix, use the RF Main Mode window to set the AMPS transmitter to channel 384.

Using the RF Tuning window, set the I and Q DC offsets to 0,0 by entering 0,0 in the “val­ues” edit box.

Center the transmit signal on the spectrum analyzer, set the span to 100 kHz. Lower the
bandwidth so that the two sidetones can be differentiated from the carrier. Measure the
amplitude of the sidetone at 20 kHz above the carrier. The amplitude of the sidetone will
probably be higher than that of the carrier; amplitude should be within the test limits.

Troubleshooting: If the carrier is not present, troubleshoot the cell TX chain using the
“things to check” list and probing tables/diagrams. If the two tones offset at 20 kHz are
not present on the TX signal, check to see if they are on Robin output at L613 at

836.52 MHz + 20 kHz. If not, there is likely a problem with N601 (Robin). Ensure power
supplies to Robin (VR2, VR3, VR6, and VIO) are correct. Check components around Robin.
If still failing, replace Robin.

TN TX DC Offset Carrier Suppression

See previous tuning. This step reports the delta between the reference at 836.52 MHz

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+ 20 kHz, and the minimum carrier level at 836.52 MHz.

The result is a delta in dB between the reference at 836.52 MHz + 20 kHz, and the mini­mum carrier level at 836.52 MHz, found by adjusting the DC offsets for I and Q individu­ally. The delta should be at least 35 dB.

Manual Verification: Set up the phone as in the previous test, and record the reference
power of the offset tone. Measure the delta between the center and offset tones. If the
delta is 35 dB or greater, the phone passes. If less than 35 dB, vary the “I“ DC offset on
the “values” line in the RF Tuning window, using the below listed values until the mini­mum carrier maximum delta is found. Leave Q at 0. On the “values” line, you enter “I,Q”.
The values, in decimal, are:

-560

-504

-448

-392

-336

-280

-224

-168

-112

-56

56

112
168
224
280
336

0

392
448
504
560

If the minimum is 35 dB or greater, the phone passes. If the minimum is less than 35 dB,
then vary Q in the same manner as I using the above values, holding I constant at the
minimum value determined above, until the delta is at least 35 dB.

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Troubleshooting: Check N601 (Robin), D200 (UEM), and associated components.

TN TX IF AGC Cell Po (0) [or (1), (2), (3), or (4)]

The IF gain curve is characterized by varying the TX_IF_AGC and measuring the transmit
power. This is only done once (in cell CDMA mode) since the same circuitry is used for
both cell and pcs.

The results are TX power readings in dBm of the transmitted signal corresponding to
given PDM settings of the Cell TX IF AGC.

Manual Verification:

Set the phone in local mode, then program it to Cell CDMA RX/TX mode on channel 384.
Set modulation to IS95 voice.

Set the Cell PA PDM to +218 decimal and the TX RF AGC to –512 decimal using the slid­ers in the PDM window under the RF menu.

Change the TX_IF_AGC to the settings in the following table, and measure the TX power
levels, checking to see that they are within the specified range.

PDM for TX IF AGC

(a) +300 decimal check tuning results file for limits

(b) + 150

(c) 0

Acceptable range for output
power (in dBm)

Change the TX_RF_AGC PDM to +511. Leave the TX_IF_AGC at 0 and the PA_AGC at
+218. Measure the output power. Subtract this power from the power measured in (c) in
the table above. This is the RF_AGC gain delta.

Leave the PA_AGC and TX_RF_AGC values as is, then enter the values listed below for
the TX_IF_AGC. Measure the output power, then add to each the RF_AGC gain delta cal­culated above. Check that these sums are within the listed ranges.

Acceptable range for

PDM for TX IF AGC

sum:[output power +- RF_AGC
gain delta] in dBm

-200 check tuning results file for limits

-400

Troubleshooting: Check Robin (N801) and supporting components. Also check D400,
which generates the PDM signals. Check AGC PDM voltages according to Tables 1 and 3.
Troubleshoot the rest of the transmitter chain if necessary as described in Table 2.

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TN PA Gain Cal Cell Po (0) [or, (1), (2), (3), (4), or (5)]

These tunings model the cell PA gain curve by setting the PA AGC PDM to several values
and measuring output power. First, the TX PA AGC and the TX RF AGC are set to (approx­imately) their maximum used values (not the maximum possible values, but the maxi­mum of the range over which they are used). Then the TX IF AGC is set so that the
transmit power on the antenna connector is approximately +11 dBm (this power is
reported in the next tuning). Then, six PDM values are written to the PA AGC and the
output power is measured for each. These values are reported in this tuning. The soft­ware then performs curve fitting to interpolate between the measured data points.

The result is the transmitted power in dBm for each of the six PA AGC PDM settings
(results labeled 0 through 5).

Manual Verification:

Turn on the cell CDMA transmitter in Phoenix using the RF Main Mode window, and set
it to channel 384. Set modulation to IS95 voice.

Set the TX_IF_AGC PDM to 0 decimal.

Set the PA AGC PDM to +218 decimal.

Set the TX RF AGC PDM to –512 decimal.

Adjust the TX IF AGC PDM so that the transmitted tone at 836.52 MHz measures
+11 dBm +/- 0.5 dB on the antenna connector, using a spectrum analyzer (use 0 as a
starting point). Make a note of this value as it is needed in other Troubleshooting sec­tions.

Write the PDM values listed below into the PA AGC and record the output power. Check
to see if the output power is within the ranges listed on the tuning result printout. (Lim­its are not provided in this document as they may change.)

PDM for PA AGC

+218 decimal limit range for Po(5)

-12 limit range for Po(4)

-202 limit range for Po(3)

Acceptable range for output
power (in dBm)

-268 limit range for Po(2)

-329 limit range for Po(1)

Troubleshooting: If the power readings are low, check the AGC voltages as in Tables 1
and 3. You can also probe on the PA input as in Table 2 to find out if the power level is
low going into the PA, or if the power level is correct going into the PA but the PA gain is
too low. If the power level going into the PA is too low, probe the TX chain at all the

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other points prior to the PA listed in the table to see where the gain is lacking. When
that point is identified, check the soldering of all related components, and replace com­ponents until the fault is found. If the power on the PA input is not low and the PA AGC
voltage is correct, similarly probe the power at all points after the PA to find the fault,
being extremely careful not to short the probing point to ground because this will
instantly destroy the PA. Visually check soldering first, and probe on PA output as a last
resort.

TX TX IF 11 dBm Set CELL Po

See previous tuning. This is the part of the previous tuning when the TX IF AGC is
adjusted so that the output power is +11 dBm

The result is a power in dBm. A perfect result would be +11.00 dBm.

Manual Verification: See previous tuning.

Troubleshooting: See previous tuning.

TN TX RF AGC Cell Po (0) [or (1), or (2)]

This tuning characterizes the RF AGC curve by entering PDM values to the RF AGC and
measuring the output power.

The results are TX power readings in dBm of the transmitted signal measured for each of
the listed PDM settings of the Cell TX RF AGC.

Manual Verification:

Turn on the cell CDMA transmitter in Phoenix using the RF Main Mode window, and set
it to channel 384. Set modulation to IS95 voice.

Set the Cell PA PDM to –329.

Set the TX_IF_AGC to the value determined in tuning TX TX IF 11 dBm Set CELL Po (above
section) to give +11 dBm on the output.

Change the TX RF AGC to the settings in the following table, and measure the TX power
levels, checking to see that they are within the specified range.

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PDM for TX RF AGC

-512 decimal check limits in tuning results file

-67 decimal

-22 decimal

+418

+511

Acceptable range for output
power (in dBm)

Troubleshooting: Check Robin (N801) according to Tables 1, 2, and 3. Also check D400,
which generates the PDM signals. Check AGC PDM voltages according to Table 1. Trou­bleshoot the rest of the cell transmitter, if needed, according to Table 2.

TN TX Gain Comp Cell (or PCS) Po MD (or LO, LM, ML, MH, HM, or HI)

Description for this and next tuning: This tuning ensures that the value of TxdBCtr cor­rectly corresponds to the absolute TX output power. On the midchannel, with TxdBCtr set
to a specified value, G_Offset is adjusted so that the output power is –8 dBm, and the
value of G-Offset is recorded (which is an absolute value) in the next tuning. The output
power in dBm is recorded in this tuning. After this is done on the midchannel, the chan­nel is changed to each of the other channels, and output power is reported. (G_offset is
not adjusted on the other channels as it was on the center channel — just the output
power is recorded).

The result is the transmitted power in dBm, which should be –8.0 dBm +/- 0.5 dB on the
center channel.

Manual Verification:

Set the phone to local mode and program it to Cellular (or PCS) CDMA RX/TX mode on
channel 384 (or 600 for PCS) using the Main Mode window.

Using the Phoenix RF Tuning window, choose “mode” = RF Tuning, and choose this test.
Adjust G_Offset in the “values” dialog box line until the TX output power (measured on
the RF connector with a spectrum analyzer) is equal to –8.0 dBm +/- 0.5 dB. Use the
G_Offset limit range as a guide to which values to enter.

Once this is done on the center channel, change to each of the other channels, and
record the power. Do not adjust G_Offset on the other channels — just record the power.
It should be within the limits listed in the tuning results file.

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Channel Cell PCS

Low 991 25

LowMid 107 200

MidLow 245 400

Mid 384 600

MidHigh 512 800

HighMid 660 1000

High 799 1199 (1199 not a voice channel,

but used in tuning

Troubleshooting: If –8 dBm cannot be attained, troubleshoot Cell TX as described in the
beginning of this chapter.

TN G_Offset Cell MD

See description of previous tuning. This step reports G_Offset.

The result is the value of G_Offset which gives –8.0 dBm transmitted power.

Manual Verification: See previous tuning. The value of G_Offset needs to be -8 dBm on
the center channel.

Troubleshooting: If G_Offset is not within the limits, troubleshoot the Cell TX as
described in the beginning of this chapter.

TN AMPS PL2 Po Mid (or Low, LowMid, MidLow, MidHigh, HighMid, or High)

This procedure tunes the AMPS transmit Power Level 0 on seven channels by adjusting
TxdBCtr. The channels are: Low= 991, LowMid= 107, MidLow= 245, Mid= 384,
MidHigh= 521, HighMid= 660, High=799. The algorithm then interpolates between the
measured points for frequency compensation.

The result is measured transmit power in dBm for power level 0 on each of the seven
channels.

Manual Verification: Set the phone to local mode and turn on the AMPS transmitter to
the channel which failed.

Using the Phoenix “RF Tuning” window, set “mode” = RF Tuning, and select this test.
Adjust TxdBCtr in the “values” dialog box until the output power is within the limits
(adjusting for cable loss).

Troubleshooting: Troubleshoot the cell transmitter as described in the Probing/Trouble­shooting Tables and Diagrams section, setting the TX AGC values to those listed for

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Power Level 0 in Table 1.

TN AMPS PL3 (or 4, 5, 6, or 7) Po

This procedure tunes power levels 3 through 7, all on the center channel. Power level 0
was tuned in the previous test. (Power levels 0, 1, and 2 are the same for this phone.)

The result is measured transmit power in dBm for power levels 3 through 7 on
channel 384.

Manual Verification: Use the same procedure as in previous tuning, but on channel 384.
Note that the limits are different from the previous tuning.

Troubleshooting: Troubleshoot the cell transmitter as described in the beginning of this
chapter, setting the AGCs as in Table 1 for the power level that failed.

TN PA Gain Cal PCS Po (0) [or (1), (2), (3), (4), or (5)]

This tuning characterizes the PCS PA gain curve, and the method is the same as the Cell
PA Gain Cal tuning described in TN PA Gain Cal Cell Po (0).

The result is the transmitted power in dBm for each of the six PA AGC PDM settings
(results labeled 0 through 5).

Manual Verification: This is the same as described in TN PA Gain Cal Cell Po (0), except
the phone is set to transmit in PCS mode on channel 600. The transmit frequency is
1880 MHz.

Troubleshooting: Troubleshoot in the same manner as described in TN PA Gain Cal Cell Po
(0) for cell band, using the PCS band tables in the Probing/Troubleshooting Tables and
Diagrams section: Tables 1, 4, and 5.

TN TX IF 11 dBm Set PCS Po

See previous tuning. This is the part of the previous tuning when the TX IF AGC is
adjusted so that the output power is +11 dBm

The result is a power in dBm. A perfect result would be +11.00 dBm.

Manual Verification: See previous tuning.

Troubleshooting: See previous tuning.

TN TX RF AGC PCS Po (0) [or (1), or (2)]

This tuning characterizes the PCS TX_RF_AGC, and the method is the same as in the SN
Cell PA Temp section, except that the phone is set up to transmit in PCS mode on chan­nel 600. The transmit frequency is 1880 MHz

The results are TX power readings in dBm of the transmitted signal corresponding to
PDM settings of the PCS TX RF AGC.

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Manual Verification: Use the same method as for the cell band described in the TN TX RF
AGC Cell Po (0) section, but set the phone to transmit in PCS on channel 600.

Troubleshooting: Check Robin (N801) according to Tables 1, 4, and 5. Also check D400,
which generates the PDM signals.

TN TX Limiting Po Cell (or PCS) IS95, Low channel (or LowMid, MidLow, Mid,
MidHigh, HighMid, or High channel)

This tuning provides an upper limit on the transmit power while in Cell (or PCS) IS95
mode. This ensures that the phone never violates the Specific Absorption Ratio (SAR)
limit, which is a health and safety specification that limits the amount of radiation near
the user’s head. The phone is set to transmit and TxdBCtr is adjusted for the maximum
transmit power.

The result is a power level in dBm, which is the maximum allowed. This is done on each
of the seven channels.

Manual Verification: Using Phoenix, set the phone to local mode, then turn on the Cell
(or PCS) transmitter set to each of the channels in the list below.

Using the RF Tuning window, adjust TxdBCtr in the “values” dialog box until the TX power
— measured on the RF connector with a spectrum analyzer — is within the limits on each
of the following channels.

Channel Cell PCS

Low 991 25

LowMid 107 200

MidLow 245 400

Mid 384 600

MidHigh 512 800

HighMid 660 1000

High 799 1199 (1199 not a voice channel,

but used in tuning)

Troubleshooting: If the maximum cannot be reached, either a component in the trans­mitter has too much loss, or not enough gain. Troubleshoot the Cell (PCS) transmitter,
with the phone set to the same channel as the failed channel.

TN TX Limiting Cell (or PCS) CDMA2000: Po

Same as previous tuning, except that CDMA2000 (C2K) modulation is used instead of
IS95.

Explanation of Result: See previous tuning.

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Manual Verification: Same as previous tuning, except choose the CDMA 2000 tuning in
the RF Tuning window.

Troubleshooting: Same as previous tuning.

TS ACPR PCS- Low (High)

Adjacent Channel Power Ratio (ACPR) is a measure of band power in the adjacent chan­nel as compared to the tuned channel, so it is a power delta in dB. Band power is mea­sured at the center tuned frequency and also at an offset lower (higher) than the center
frequency, and the difference is ACPR. For this test, the offset is –1.25 MHz (+1.25 MHz).
Band power is integrated power over a frequency band, rather than at a single frequency.
The bandwidth for the measurement centered at the tuned frequency is the bandwidth
of the signal, which for IS95 is 1.23 MHz. The bandwidth used at the offsets is 30 kHz.

Result is ACPR (a power delta) in dB.

Manual Verification: Set the phone in local mode, and turn on the PCS transmitter set to
channel 600. Use the TX Limiting function in the RF Tuning window to set the transmit
power to the maximum value (within the limits for the “TX Limiting” tuning).

Observe the TX signal on the spectrum analyzer. If the spectrum analyzer being used has
a CDMA personality card, ACPR can be read directly off the screen. If not, then set the
bandwidth to 30 kHz, and set the averaging on. Center the marker at 1880 MHz and note
the power in dBm. Use the offset marker to measure the power at an offset of -1.25 MHz
(+1.25 MHz). Subtract the two power readings, then add 16 dB to compensate for the
fact that the power at the center frequency was measured with a 30 kHz bandwidth
rather than 1.23 MHz. Figures 3 and 4 below show examples of good and bad ACPR.

Figure 3: Good ACPR (analyzer screenshot)

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Figure 4: Bad ACPR (analyzer screenshot)

Troubleshooting: If one or more of the AGC values needs a value much higher than nor­mal to achieve maximum power, that would indicate that a component in the chain has
less gain (or more loss) than it should, and another component that is compensating for
that could be saturating. Use the AGC information as a guide to troubleshoot the PCS
chain as described in the Probing/Troubleshooting Tables and Diagrams section, being
careful to check all decoupling capacitors (C614, C615, C605, C603, C602, C624, C621,
C651, C611, C634, C635, C608, C650, C817, C808, C814, C809, C813). Severely degraded
ACPR is detectable just by looking at the shape of the CDMA curve (see figure above);
therefore, you can also probe each point in the TX chain to see if ACPR becomes
degraded at one point.

TN PA Detector PCS Po (0) [or (1), (2), (3), (4), (5), (6), or (7)]

This tuning determines the output voltage of the TX power detector as a function of
transmitted RF power.

The result is the measured transmitted power in dBm.

Manual Verification: Find out the value of TxdBCtr which sets TX Limiting in IS95 mode
on channel 600 in PCS by performing the manual tuning of the TN TX Limiting Po Cell (or
PCS) IS95 section (TX Limiting). Next, choose the PA Detector PCS tuning in the RF Tun­ing window. Enter the values of TxdBCtr that are listed in the following table into the
“values” dialog box, and ensure that the transmitted power is within the limits.

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TxdB Ctr Value Transmitted power (in dBm)

(TxdBCtr for TX limiting) + 350 Check tuning results file for limits

(TxdBCtr for TX limiting) - 500

(TxdBCtr for TX limiting) - 1000

(TxdBCtr for TX limiting) - 1500

(TxdBCtr for TX limiting) - 3200

(TxdBCtr for TX limiting) - 4200

Troubleshooting: If transmitted power levels can not be attained, check PCS TX as
described at the beginning of this chapter.

TS ACPR Cell - Low

See description for PCS ACPR. In cell band, however, the offset is –0.9 MHz (+ 0.9 MHz).

See TN TX Limiting Po Cell (or PCS) IS 95 section for an explanation of results.

Manual Verification: Set up the measurement as described in the TN TX Limiting Po Cell
(or PCS) section, but turning on the Cell transmitter to channel 384. Likewise, use the
TxdBCtr value for Cell TX Limiting on channel 384 in IS95 mode. Measure at the center
frequency of 836.52 MHz, and the offset of +/- 0.9 MHz.

Troubleshooting: Refer to the TN TX Limiting Po Cell (or PCS) IS95 section, and also the
Cell TX troubleshooting guide of the Probing/Troubleshooting Tables and Diagrams sec­tion. Cell band TX decoupling capacitors are C653, C633, C649, C648, C619, C817, C810,
and C811.

TN RX IF AGC RXdBCtr (0) [or (1) or (2)]

This tuning calibrates the RX IF AGC curve since the output power of the IF part of the
Batman IC is not a linear function of RX_IF_AGC. The tuner injects three known signal
power levels into the phone’s receiver, and for each one the phone’s AGC algorithm
adjusts the RX_IF_AGC to get the same amplitude at the output of Batman, although
different amplitudes are going in. From these three points, curve fitting is used to inter­polate between measurement points.

The result is a value of RxdBCtr (which corresponds to a value of RX_IF_AGC) for each of
three CW input powers injected into the receiver:

Trimode PCS only

-87.5 dBm -89 dBm

-57 dBm -61 dBm

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Trimode PCS only

-18 dBm -22 dBm

Manual Verification: With the phone in local mode, use the Main Mode window to turn
on the AMPS receiver set to channel 384. Using the RF Tuning window, perform the man­ual tuning three times, each time injecting the CW signal at the amplitudes listed above
— one amplitude per tuning. Each time, record RxdBCtr, which is returned by Phoenix
during the manual tuning. For the manual tuning, use the RF Tuning window with
“mode”=RF Tuning, and choose the appropriate tuning name. Ensure that the resulting
value of RxdBCtr is within the limits in the tuning results file.

Troubleshooting: While injecting a signal into the receiver, check the values of RSSI and
RX_IF_AGC PDM value and, if needed, voltage. RSSI should be within +/- 2 dB of the
actual power in dBm on the RF connector. Table 3a lists limits and typical values. The
AGC will try to keep the same amplitude on Batman output; therefore, if the AGC value
is larger than normal, then the AGC is compensating for loss in the chain prior to the
variable gain amplifier.

After checking RSSI and AGC value, if it is still necessary to probe to pinpoint the source
of the error, use the AMPS probing tables.

TN LNA AMPS (or Cell or PCS) LowGain (or HighGain) LO (or LM, ML, MD,
MH, HM, HI)

This tuning records RxdBCtr (which is automatically adjusted to produce the same ampli­tude on the receiver output no matter what the input is) for the receiver with the LNA in
highgain mode, and again with the LNA in lowgain mode. For AMPS, this is done only on
the center channel, but for Cell and PCS it is done over several channels.

The result is a value of RxdBCtr.

Manual Verification: Using Phoenix, choose this tuning in the RF Tuning window. Inject a
CW signal that is 10 kHz offset from the center frequency of the channel that is being
tuned. For AMPS, set the amplitude to –65 dBm, for Cell and PCS set it to –95 dBm.
Record RxdBCtr, which is returned from Phoenix in the lowest field in the RF Tuning win­dow.

Troubleshooting: Check Alfred and supporting components.

Final UI test: Rho

Rho is a measure of CDMA transmit signal quality which encompasses other transmitter
indicators such as phase error and magnitude error. Rho is measured with the phone in a
phonecall, and is read directly from the call box. Rho is measured with sector power=
75 dBm. If Rho fails, first check the signal purity of the LOs. Check synthesizer compo­nents and power supply decoupling.

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Final UI test: Frame Error Rate (FER)

This measurement — also made in a phone call — measures the frame errors of the
receiver in CDMA mode. A low amplitude signal (typically at receiver sensitivity level of –

104.0 dBm) is injected into the receiver, and the FER is recorded. FER is measured in per­centage, and 0.5 % or lower is passing (w/ 95% confidence). Failures are most often
caused by excess loss/insufficient gain in the receiver chain, (and sometimes by excess
noise in the receiver). Check for correct signal levels and AGC values/voltages as
described in the Probing/Troubleshooting Tables and Diagrams section.

Final UI test: SINAD

Signal-to-Noise-and-Distortion (SINAD) is similar to a sensitivity/FER measurement for
CDMA, but is used in AMPS.

A low-level signal (typically at a sensitivity level of -116.0 dBm) is injected into the
receiver, and SINAD is read off the call box, with 12 dB as the passing limit.

Probing/Troubleshooting Tables and Diagrams

When measuring CDMA transmit signals, if the spectrum analyzer does not have a CDMA
personality card, then the CDMA signal power can be approximated by setting the Resolu­tion Bandwidth to 1 MHz and using the marker. This is because CDMA signal power is
measured by integrating power over a 1.23 MHz bandwidth, and the marker measures
power at only one frequency.

In most cases, probing is done in local mode (i.e., not in a call). Situations may arise
whereby the troubleshooter may need to probe while in a call; however, in some cases
probing may disturb the circuit so that the call drops.

Although the tables list power levels for many combinations of AGC values, it is generally
only necessary to check one combination. The extra information is provided in case it
may be useful in an unexpected situation. Likewise, 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 high
impedance 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 measurements if using a
probe attenuator.

Where a range is given for loss, typically the higher loss occurs at the band edges.

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 since the input impedance might be different from the output imped­ance. However, after mathematically adjusting the power on either the input or output
to compensate for the difference in impedance, 5 dB is then calculated. Most compo-

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nents 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 will be the same for a CW signal as for CDMA.

Transmitter Probing

Table 1: Transmit Output Powers and Associated AGC PDM values and voltages

channel 384 (Cell) or 600 PCS

AMPS

TX RF AGC TX IF AGC Probed RF

PDM value voltage PDM value voltage PDM value voltage

typical v typical v dBm typical v dBm

-409 0.17 -110 0.68 -11.2 +/- 3 dB -19 0.84 26.5 (PLO)

-409 0.17 -92 0.71 -13.2 +/- 3 dB -123 0.66 25.0 (PL3)

-409 0.17 -76 0.74 -15.4 +/- 3 dB -310 0.34 21.0 (PL4)

-249 0.44 -66 0.77 -19.4 +/- 3 dB -330 0.30 17.0 (PL5)

-104 0.70 -56 0.78 -22.4 +/- 3 dB -330 0.30 13.5 (PL6)

37 0.95 -48 0.79 -27.9 +/- 3 dB -330 0.30 9.0 (PL7)

CELL CDMA

-403 0.17 -115 0.678 -14 +/- 3 dB 220 1.27 25

-403 0.17 100 1.064 -38 +/- 3 dB -270 0.40 -2

200 1.23 100 1.064 -56 +/- 3 dB -331 0.29 -23

450 1.68 105 1.07 -70 +/- 3 dB -331 0.29 -39

511 1.78 170 1.19 -80 +/- 3 dB -331 0.29 -50

power on

Balun Out

PA AGC RF power

on RF con­nector

PCS

-428 0.13 -220 0.495 -17 +/- 3 dB 220 1.27 24

-235 0.46 -28 0.832 -47 +/- 3 dB -324 0.31 -3

290 1.39 -28 0.832 -66 +/- 3 dB -324 0.31 -23

511 1.78 -20 0.846 -76 +/- 3 dB -324 0.31 -38

511 1.78 110 1.082 +/- 3 dB -324 0.31 -50

IMPORTANT NOTE: AGC PDM values will change (sometimes drastically) as the phone warms up.
The table above lists PDM values for when the phone is first turned on. After 10 minutes at full power,
PDM values will be different.

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Table 2: RF/Analog Probing for Cell/AMPS Transmitter

Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)

Probing Point

Probing
location on
board

Probed absolute power (dBm) or
gain/loss (dB), or voltage (v)

Robin (N601) out
= Balun (T604) in

Balun (T604) out =
Tomcat (N603) in

Tomcat (N603) out
= TX SAW filter
(Z604) in

TX SAW filter
(Z604) out = cell
PA (N801) in

Cell PA (N801) out
= cell isolator
(Z802) in

2a and 2b,
Figure 5

3, Figure 5 See Table 1 T604, C640, C642, L603, L604,

4, Figure 5 Gain = 12-16 dB through Tomcat N603 (also ensure 3.6v on pin 5

5, Figure 5 Loss = 2-3 dB through SAW Z604, N603, N801 (Vbat)

6, Figure 5.
Probing here
not recom­mended unless
necessary; best
to measure on
RF connector

easiest to probe on balun output as
per Table 1. Nominal loss through
balun=1dB, but will appear as
3-4 dB gain due to impedance dif­ference. On Robin output, you may
see amplitude imbalance between
two sides of probing point 2 due to
impedance differences (less in cell).

PA has variable gain, see Table 1.
Best to measure on RF connector.

N601 (ensure VREFRF02 is 1.35v as
in Table 2. Check AGC voltages/
PDMs as in Table 2), T604, L604,
L603, C640, C642, C907, N603
(including check for 3.6v on pin5),
D400 (including AGC voltage check
in Table 2)

N601, C907, N603 (including check
for 3.6v (Vbat) on pin 5 and 2.6v on
pin 4)

and PD_CELL high as in Table 2),
N601, C649, C639, Z604, N801
(Vbat)

N801 (including: check 3.6v on
Vbat), Z802, R805, R801, L801),
D400 (including AGC voltage check
in Table 1), N601 (since Iref, also
check PA_AGC as in Table 1)

Cell isolator
(Z802) out = cell
duplexer (Z803) in

Cell duplexer
(Z803) out =
diplexer (Z805) in
(In singlemode
phones, a resistor
replaces the
unused duplexer:
R810 for PCS only,
R811 for Cell only)

7, Figure 5.
Probing here
not recom­mended unless
necessary; best
to measure on
RF connector

8, Figure 5.
Probing here
not recom­mended unless
necessary; best
to measure on
RF connector

Loss = 0.6 dB through isolator. Best
to measure on RF connector as in
Table 1.

Loss = 1-3 dB through duplexer Z803, Z805, Z804, L750, N750,

Z802, N801 (Vbat), R805, R801,
Z803

X814. If no cable connected to
X814, then additionally: X811.

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CCS Techni cal Documentation Troubleshooting — RF

Table 2: RF/Analog Probing for Cell/AMPS Transmitter

Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)

Probing Point

Probing
location on
board

Probed absolute power (dBm) or
gain/loss (dB), or voltage (v)

UHF LO at 1009.62
MHz for channel
384

VHF LO at 346.2
MHz for cell band,
any channel

10E, Figure 5.
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power.

11a, Figure 5
(you can touch
top of plastic
to verify pres­ence of LO, but
this won’t
measure
amplitude
accurately)

Power approximately -3 dBm Check to see if LO is present. If no

LO present, check R515, C511,
C501, C532. Make sure there is

2.7v at TP 10B. If voltage is less
than 2.6v, refer to Baseband regu­lator troubleshooting. If voltage is

2.7v, check G502 at TP 10A with a
FET probe to see if UHF LO is
present. Check that 19.2MHz clock
is present at TP 10C. If LO is
present but unlocked, check C518,
C508, R508, R503, C509, R550,
and C550. Pay attention to C508,
as it is easily damaged. If LO is
present and locked, but doesn’t
appear at TP 10E, check R519,
R509, C506, N502, L501, C514, and
C519.

N601, C612, C613, R607, R605,
C632, R606, C618, R609, C629,
V602, C637, V601, C630, C631,
L611, C638, R604, R601, R602,
R613

Table 3: DC probing for Cell/AMPS transmitter

Item to
check

TX RF AGC See Table 1 12, Figure 8 See Table 1 D400 (UPP), R433, C426, R434,

TX IF AGC See Table 1 13, Figure 8 See Table 1 D400 (UPP), R427, C422, R428,

PA AGC See Table 1 14, Figure 8 See Table 1 D400 (UPP), R430, C424, R431,

PD_CELL High for TX on,

VREFRF02 fixed 50, Figure 5 1.35v D200, C606, N601

Setting

Low for TX off

DC probing
location on
board

49, Figure 5 High=2.6v

DC Voltage

Low=0v

Items to check if voltage
incorrect

C427, C429, V420, N601

C423, C430, V421, N601

C425, C431, V422, N601

N601, C649, N603 (pin 4)

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Troubleshooting — RF CCS Technical Documentation

Table 3: DC probing for Cell/AMPS transmitter

Item to
check

PA_BOOST N/A N/A N/A N/A

Probing point

Robin (N601)out =
PCS Balun (T603)
in

Setting

Probing
location on
board

16a and 16b,
Figure 5

DC probing
location on
board

Table 4: RF/Analog Probing for PCS transmitter

Measured power (dBm) using RF
probe, or gain/loss (dB)

Easiest to probe on balun output as
per Table 1. Nominal loss through
Balun = 1 dB, but it will appear as
1-2 dB gain due to impedance. On
Robin output you may see ampli­tude imbalance between 2 sides of
probing point 16 due to impedance
differences, (less in cell).

DC Voltage

Items to check if voltage
incorrect

What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)

N601 (also check VR2, VR3, VR6,
VRIO, include check of AGCs as in
Table 5, check VREFRF02 as in
Table 5), T603, L609, L610, C624,
C647, L666, C646, L667, C660,
N602 (including check for 3.6v on
pins 7 and 9), D400

PCS Balun (T603)
out = Hornet
(N602) in

Hornet (N602) out
= PCS TX SAW
filter (Z601) in

PCS TX SAW filter
(Z601) out =
switch (N805) in

Switch (N805) out
= PCS PA (N802)
in

17, Figure 5 See Table 1. T603, L609, L610, C624, C647,

L666, C646, L667, C660, N602
(including check for 3.6v on pins 7
and 9), D400

18a for chan­nels 25-599,
18b for chan­nels 600-1175,
both Figure 5

19a for chan­nels 25-599,
19b for chan­nels 600-1175,
both Figure 5

20, Figure 5 Loss=0.5 – 1.0 dB through switch N805 (including FILSEL1 and

Gain=14.5-17.5 dB through Hornet N602 (including: ensure 3.6v on

pins 7 and 9; ensure PD_PCS high
as in Table 5; and check PCS_CTRL
as in Table 5 according to the
channel used), Z601, C611, C635,
C634, C627, C645, N605 (including
FILSEL1 and FILSEL2 as in Table 5)

Loss=2-3.5 dB through filter N602 (including: ensure 3.6v on

pins 7 and 9; ensure PD_PCS high
as in Table 5; and check PCS_CTRL
as in Table 5, according to the
channel used), Z601, C611, C635,
C634, C627, C645, N805 (including
FILSEL1 and FILSEL2 as in Table 5)

FILSEL2 as in Table 5), N802
(including check for 3.6v on Vbat),
C809, C814, C808

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CCS Techni cal Documentation Troubleshooting — RF

Table 4: RF/Analog Probing for PCS transmitter

What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)

Probing point

Probing
location on
board

Measured power (dBm) using RF
probe, or gain/loss (dB)

PCS PA (N802) out
= PCS isolator
(Z801) in

PCS isolator
(Z801) out= PCS
duplexer (Z804) in

PCS duplexer
(Z804) out =
diplexer (Z805) in.
In singlemode
phones, a resistor
replaces the
unused duplexer:
R810 for PCS only,
R811 for Cell only.)

Diplexer (Z805)
out= RF connector
(X814) in.

21, Figure 5.
Probing here
not recom­men-ded
unless neces­sary. Best to
measure on RF
connector.

22, Figure 5 Loss=0.6 dB through isolator Z801, Z804

23, Figure 7 Loss=3 dB through PCS duplexer,

9, Figure 7 Loss=0.5 dB through diplexer Z803, Z804, L750, N750, C801,

See Table 1. Best to measure on RF
connector.

TX to ANT port

N802 (3.6v on Vbat), Z801, R802,
L801, L802, D400, N601 (since Iref,
also check PA_AGC as in Table 5)

Z801, N802 (Vbat), R802, Z804,
Z801, Z805, L750, N750, X811
X814

L812, X814. If no cable connected
to X814, then additionally: X811

UHF LO at

2088.1 MHz for
PCS on channel
600

VHF LO at

416.2 MHz for
PCS, any channel

10E, Figure 5.
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power

11a, Figure 5 N601, C612, C613, R607, R605,

Approx –3 dBm Check to see if LO is present. If no

LO is present, check R515, C511,
C501, C532. Make sure there is

2.7V at TP 10B. If voltage is less
than 2.6V, then refer to baseband
regulator troubleshooting. If volt­age is 2.7V, check G502 at TP 10A
with a FET probe. Check that the

19.2 MHz clock is present at TP
10C. If LO is present but unlocked,
check C518, C508, R508, R503,
C509, R550, and C550. Pay partic­ular attention to C508, as it is eas­ily damaged. If LO is present and
locked, but doesn’t appear at TP
10E, then check R519, R509, C506,
N502, L501, C514, and C519.

C632, R606, C618, R609, C629,
V602, C637, V601, C630, C631,
L611, C638, R604, R601, R602

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Troubleshooting — RF CCS Technical Documentation

Table 5: DC probing for PCS transmitter

Item to
check

TX RF AGC See Table 1 12, Figure 8 See Table 1 D400 (UPP), R433, C426, R434,

TX IF AGC See Table 1 13, Figure 8 See Table 1 D400 (UPP), R427, C422, R428,

PA AGC See Table 1 14, Figure 8 See Table 1 D400 (UPP), R430, C424, R431,

Filter
select 1

Filter
select 2

PCS_
CTRL

PD_PCS High=

Setting

Low for ch 25­599, high for
ch 600-1175

High for ch
25-599, low
for
ch 600-1175

Low=ch 600­1175, high =
ch 25-599

TX on, Low =
TX off

DC probing
location on board

30a, Figure 5 Low=0v

30b, Figure 5 Low=0v,

52, Figure 5 Low=0v, high=

53, Figure 5 High=2.6v

DC voltage

High=2.5v min

high=2.5v min

1.9v min

min, low=0v

Items to check if voltage
incorrect

C427, C429, V420

C423, C430, V421

C425, C431, V422

N601, N605, C650

N601, N605, C608

N601, N602 (pin1)

N601, N603, C611

Receiver Probing

AMPS ch 384
LowGain

AMPS ch 384
HighGain

CELL ch 384 Low­Gain

CELL ch 384 High­Gain

PCS ch 600 Low­Gain

PCS ch 600 High­Gain

Table 6: Receiver PDM values

PDM lower
limit

2 102 55 0.98 -65 dBm should be

127 215 173 1.19 -65 dBm

-1 106 60 0.99 -65 dBm

-119 -3 -64 0.78 -95 dBm

16 11 8 72 1.01 -65 dBm

-109 7 -55 0.79 -95 dBm

PDM
upper
limit

PDM mean

PDM mean
voltage

RX power
in

RSSI

within +/- 2dB
of actual RX
signal above

-104 dBm,
+2/-4 below

-104

In AMPS, ensure 230 mV on I,Q traces of Batman out, probing point 40 of Figure 6.

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CCS Techni cal Documentation Troubleshooting — RF

Use CW signal for AMPS, use CDMA signal for CELL and PCS. Call box can generate both.

Table 7: RF probing for Cell CDMA and AMPS front end receiver

What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)

Probing point

Probing
location on
board

Probed absolute
power (dBm) or gain/
loss (dB)

Diplexer (Z805)
out= cell duplexer
(Z803) in.

Cell duplexer
(Z803) out= Alfred
(N750) in

Alfred (N750) LNA
out= cell RX saw
(Z751) in

Cell RX saw (Z751)
out=Alfred (N750)
mixer in

UHF LO at 1009.62
MHz in Cell
CDMA/AMPS for
channel 384

8, Figure 7 Loss=0.5 dB through

diplexer

32, Figure 5 Loss=2-4 dB through

duplexer

33, Figure 7 Gain=12-14 dB for

high gain mode
(GAIN_
CTL=high. Use RF AGC
status window to
monitor state.),
Loss=-3 to –5 dB for
low gain

34, Figure 7 Loss=1-3 dB through

SAW filter

10D, Figure 7.
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power

Approx –3 dBm Check to see if LO is present. If no

X800, L812, C801, Z805, Z803

Z803, L750, N750 (VRX)

N750 (Also ensure BAND_SEL low
as in Table 9. Also IF_SEL low for
CDMA and high for AMPS, as in
Table 9. Ensure GAIN_CTL is high if
RX power is below the LNA switch
point.), Z751, C755, L752, C757,
R764, C753, R768, C756

Z751, N750, R765, C750, R768,
C756, L757, C758

LO is present, check R515, C511,
C501, C532. Make sure there is

2.7V at TP 10B. If voltage is less
than 2.6V, then refer to baseband
regulator troubleshooting. If volt­age is 2.7V, check G502 at TP 10A
with a FET probe to see if UHF LO is
present. Check that the 19.2MHz
clock is present at TP 10C. If LO is
present but unlocked, check C518,
C508, R508, R503, C509, R550,
and C550. Pay particular attention
to C508, as it is easily damaged. If
LO is present and locked, but
doesn’t appear at TP 10D, then
check R505, R507, L771.

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Table 8: RF probing for AMPS back end receiver

What to check if RF power not
correct (soldering, shorts, DC
power applied if active, correct
voltage of DC signals, otherwise
replace)

Probing point

Probing
location on
board

Probed absolute
power (dBm) or gain/
loss (dB)

Alfred (N750)
mixer out= AMPS
RX IF saw (Z752)
in

AMPS RX IF filter
(Z752) out= Bat­man (N701) in

Batman (N701)
out= UEM (D200)
in

VHF LO at 256.2
MHz

36, Figure 6 This point not 50

ohms. Will
measure approx

-28 dBm for -52 dBm
input and RX AGC
PDM=225.

37, Figure 6 This point not 50

ohms. Will
measure approx

-46 dBm for -52 dBm
input and RX AGC
PDM=225.

40, Figure 6 See Table 6, RSSI most

useful.

39, Figure 6 N701, C701, C714, R703, R702,

N750 (Also ensure BAND_SEL low
as in Table 9. Also IF_SEL low for
CDMA and high for AMPS, as in
table 3d.), R765, C750, L771, R768,
C756, L770, L757, C758, L755,
C769, R750, L753, C759, C766,
C784, L764, C781, Z752

Z752, L765, C777, L766, C778,
L768, L767, C779, N701 (VR5, VR7,
VIO)

N701 (VR5, VR7, VIO, ensure 1.35v
on VREFRF01 as in Table 9, also
check RX_IF_AGC as in Table 9),
R706, C704, R705, R704, V701,
C716, L701, C702, C715, R702,
C714, R703, C701,

C715, R704, V701, C716, L701,
C702, R705, C706

Table 9: DC probing for receiver

Item to check Setting

RX IF AGC See Table 6 for

PDM settings

BAND_SEL High=PCS

Low=Cell

GAIN_CTL High=LNA high

gain, Low=LNA
low gain (both
Cell & PCS)

IF_SEL High=

AMPS, Low=
CDMA

DC probing
location on
board

60, Figure 6 See Table 6 for

54, Figure 7 High=2.4vmin,

55, Figure 7 High=2.4vmin,

56, Figure 7 High=2.4vmin,

DC voltage

typical voltages

Low=0.3v max

Low=0.3v max

Low=0.3v max

Items to check if voltage
incorrect

D400, R435, C428, C435, N701

N701, N750, R768, C756, G502

N701, N750, R764, C753

N701, N750, R765, C750

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CCS Techni cal Documentation Troubleshooting — RF

Table 9: DC probing for receiver

DC probing

Item to check Setting

VREFRF01 fixed 57, Figure 6 1.35 v D200, C706, N701

Table 10: RF probing for PCS front end receiver

Probing

Probing point

Diplexer (Z805)
out= PCS duplexer
(Z804) in.

PCS duplexer
(Z804) out= Alfred
(N750) LNA in

location on
board

23, Figure 7 Loss=0.5 dB through

42, Figure 7 Loss=1-3.5 dB

location on
board

Probed absolute
power (dBm) or gain/
loss (dB)

diplexer

through duplexer

DC voltage

Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)

X800, L812, C801, Z805, Z804,
Z801, C752, L751, N750. (If all
these are ok and it passes con­ducted test but fails radiated test,
then check the following: L802,
R823, L803, R824, X811, X810,
X814, L851)

Z804, Z801, Z805, C752, L751,
N750 (including check for proper
voltages on Alfred signaling as in
table 3c)

Items to check if voltage
incorrect

Alfred (N750) LNA
out= PCS RX saw
(Z750) in

PCS RX saw
(Z750) out=Alfred
(N750) mixer in

43, Figure 7 Gain=12-14 dB for

high gain, Loss=-3 to
–5 dB for low gain,
use AGC status win­dow to monitor gain
status

44, Figure 7 Loss=1-4 dB Z750, N750 and supporting com-

N750 and supporting components
(Also ensure BAND_SEL high as in
Table 9. Also IF_SEL low for CDMA
as in Table 9. Ensure GAIN_CTL
high if RX power is below the LNA
switch point), Z750

ponents (including check for proper
voltages on Alfred signaling as in
Table 9)

Issue 1 11/2002 Nokia Corporation Confidential Page 37

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Table 10: RF probing for PCS front end receiver

Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)

Probing point

Probing
location on
board

Probed absolute
power (dBm) or gain/
loss (dB)

UHF LO at 2088.1
MHz for PCS
channel 600

Probing point

10D, Figure 7.
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power

Table 11: RF probing for Cell CDMA and PCS back end receiver

Probing
location on
board

Approx –3 dBm Check to see if LO is present. If no

LO is present, check R515, C511,
C501, C532. Make sure there is

2.7V at TP 10B. If voltage is less
than 2.6V, then refer to baseband
regulator troubleshooting. If volt­age is 2.7V, check G502 at TP 10A
with a FET probe. Check that the

19.2MHz clock is present at TP
10C. If LO is present but unlocked,
check C518, C508, R508, R503,
C509, R550, and C550. Pay partic­ular attention to C508, as it is eas­ily damaged. If LO is present and
locked, but doesn’t appear at TP
10D, then check R505, R507, L771.

Where to start checking if RF
Probed absolute
power (dBm) or gain/
loss (dB)

power not correct (soldering,

shorts, DC power applied if

active, correct voltage of DC

signals, otherwise replace)

Alfred (N750)
mixer out= CDMA
RX IF saw (Z753)
in

CDMA RX IF saw
(Z753) out= Bat­man (N701) in

Batman (N701)
out= UEM (D200)
in

46, Figure 6 This point not 50

ohms. Will
measure approx -14
dBm for -52 dBm
input and RX AGC
PDM=225.

47, Figure 6 This point not 50

ohms. Will
measure approx

-47 dBm for -52 dBm
input and RX AGC
PDM=225

40, Figure 6 Easiest to use RSSI,

see Table 6.

N750 and supporting components

(Also ensure BAND_SEL low for

Cell CDMA and high for PCS as in

Table 9. Also IF_SEL low for CDMA

as in Table 9), L754, C782, C767,

C761, C786, Z753

Z753, N750 and supporting com-

ponents (including check for proper

voltages on Alfred signaling as in

Table 8), L754, C782, C767, L759,

C770, C771, C772, L760, L761,

N701

N701 (VR5, VR7, VIO, ensure 1.35v

on VREFRF01 as in Table 9, also

check RX_IF_AGC as in Table 9),

R705, C704, R706, C706, C701,

C714, R703, R702, C715, R704,

V701, C716, L701, C702

Page 38 Nokia Corporation Confidential Issue 1 11/2002

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CCS Techni cal Documentation Troubleshooting — RF

Table 11: RF probing for Cell CDMA and PCS back end receiver

Where to start checking if RF

power not correct (soldering,

shorts, DC power applied if

active, correct voltage of DC

signals, otherwise replace)

Probing point

Probing
location on
board

Probed absolute
power (dBm) or gain/
loss (dB)

VHF LO at 256.2
MHz

39, Figure 6 N701, C701, C714, R703, R702,

C715, R704, V701, C716, L701,

C702, R705, C706

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RF Power Supplies

Table 12: DC supplies for RF circuitry

Supply Voltage Supplied components Probing location

VR1A 4.75 VCTCXO, UHF PLL, Charge Pump figure 9

VR1B 4.75 Robin Not accessible

VR2 2.78 Robin, Power Detector figure 9

VR3 2.78 Robin, VCTCXO figure 9

VR4 2.78 UHF PLL figure 9

VR5 2.78 Batman figure 9

VR6 2.78 UHF LO Buffer figure 9

VR7 2.78 Batman figure 9

VIO 1.8 Robin, UHF PLL figure 9

VRX 2.78 Alfred figure 9

VPLL 2.78 UHF PLL figure 9

VBAT 3.1-4.2 PA figure 9

Page 40 Nokia Corporation Confidential Issue 1 11/2002

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A

B

CCS Techni cal Documentation Troubleshooting — RF

Probing Diagrams

32

7

6

19B

19A

4

(pin6)

3

10E

22

21

30

30

5

20

18B

18A

49
2A

2B

52

pin1

53

16A

16B

17

D

E

11B

50

11A

Figure 5: Probing diagram (TX components)

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Troubleshooting — RF CCS Technical Documentation

36

46

37

10B

F

10

C

10A

39

57

A

10C

47

(che ck

both)

B

40

Figure 6: Probing diagram (RX IF components)

60

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CCS Techni cal Documentation Troubleshooting — RF

42

33

34

23

43

54

44

55

9

8

56

Figure 7: Probing diagram (RX LNA components)

10D 23

13

12

Figure 8: Probing diagram (BB area)

14

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Figure 9: Probing diagram (voltage regulators)

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CCS Techni cal Documentation Troubleshooting — RF

48

Figure 10: Probing diagram (power detector)

APPENDIX A: Phoenix Instructions

To turn on the PCS or Cell CDMA transmitter

Under the "RF" menu, choose "main mode", which opens the dialog box shown below.

To turn on the transmitter, first turn on the carrier by highlighting "RX/TX" in the sub-

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Troubleshooting — RF CCS Technical Documentation

window at the top (which also turns on the receiver), typing the channel in the "channel"
field, then clicking the Set button in the upper right hand corner.

Next turn on the modulation by opening the “CDMA Control” dialog box under the “DSP”
menu. This dialog box is shown below.

Highlight "Rho" in the "functions" field, and click "Rho ON" in the "state" field. Choose
"Cell" or "PCS" in the "band" field. Under "Radio Configuration" choose the desired con­figuration. C2K is an abbreviation for IS2000. Click Execute button.

To turn on the AMPS transmitter

Eventually, the method will be to use the “RF Main Mode” dialog box as shown above,
choosing “AMPS” in the “Band” field. However, at the moment there is a software prob­lem with this method, with the result that once the AMPS transmitter is turned on in this
manner, it does not respond correctly to AGC PDM adjustment.

As a temporary solution, the “AMPS Control” dialog box, shown below, can be used.

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Select the desired channel and power level, click “Transmitter ON”, then click Execute.
The reason why this is a temporary solution is because in some instances, the AFC and
AGC are not disabled, with the results that the signal will not be stable in frequency and
will not respond to AGC PDM adjustment. If this is the case, manually disable the AFC
and AGC using the “DSP Memory” dialog box shown below.

Choose the “Data” option in the “Address Space” field, type in the address, leave the
“subcount” entry at “1”, then click Add button. The address will then be displayed in the
field in the lower half of the dialog box. Use this method to enter in both the AFC Disable
and AGC Disable addresses. These addresses can be obtained from R&D, and they can
change with software version. This is the reason this method is temporary.

Once both addresses are entered, check “Periodic Read On”, then click Stop button. Then
click the Read button, which will display the values in both addresses. Both should be
“1”. Change both to “0” by clicking on the “1”, which will highlight the data in the
address, then you can edit the contents and change the “1” to a “0”. Enter a return on
your keyboard to enter the new value. Once the contents of both addresses are changed
to “0”, click the Write button, which writes them into the phone. This data will remain in
the phone until the phone is powered down.

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To turn on the receiver only, in any mode

To turn on the receiver only, use the “Main Mode” dialog box as shown previously, high­light "RX". In the "band" field, choose "Cell CDMA" or "PCS CDMA"

To verify a single, manual tuning

Open the “RF Tuning” dialog box, shown below. The tuning descriptions at the beginning
of this document describe the tuning and tell you what you need to enter, if anything,
and what values will be returned to you from the phone, if any.

According to these descriptions, choose “self tuning” for self tunings, and “RF Tuning” for
the others. Choose the appropriate test from the “tuning names” list. Values that you
must enter are entered in the “values” dialog box. If more than one value is entered,
enter a delay time in seconds in the “delay” box. This is the delay between applications of
the multiple values entered. Three seconds is sufficient for all tests to run, however in
certain cases you may want to increase the delay in order to closely observe the phone’s
behavior during the tuning.

Any data returned from the phone is displayed on the status line, the box at the bottom
which in the figure below says “8 tuning, 7 self-tune Ids configured”. If no tuning value
is returned, this line will indicate if the tuning was successful or not. To begin a tuning,
click the Tune button.

To adjust PDM values of AGCs and AFC

In the "PDM" dialog box, which follows, are several sliders, one each for each of the AGCs
and the AFC. Drag the slider pointer with your mouse to the value that you want to set.
The values are in decimal. Then click Set button. Alternatively, you can click the up and
down arrows next to the value fields below the sliders, which will increase or decrease
the value one step at a time. If you do this, you do not have to click Set.

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To read tuning values from the phone

Open the "Batch Tune" dialog box, as shown below. To read the tuning values from the
phone, click Read All button under the "phone" heading. However, in order for the tun­ing values to be displayed, you must first load the template file by clicking Load File but­ton under the “Parameter File” field. Ensure that the template file used is appropriate for
the software version in the phone.

To read RSSI and AGC PDM values from the phone

Open the “AGC Status” dialog box, which follows. Click “Enable Trace”. RSSI is the value
near the antenna on the receiver side. The AGC PDM values are shown beside their
respective variable gain amplifier in the block diagram. The TX AGC PDMs are, as shown
in the diagram from right to left, IF_AGC, RF_AGC, PA_AGC.

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To load a PRL into the phone

Use the "PRL" dialog box as shown below. Click the Load PRL From File button, and
choose the desired file, which will then appear in the list on the left side of the window.
Highlight the desired file in the list so that it is blue, then click the Write PRL To Phone
button. At the bottom of the window, a status message will indicate if the file was
loaded correctly or not.

To change between Local and Normal modes

To make a call, the phone should be in normal mode. In normal mode, the phone soft­ware is running, and the phone will search for a pilot. To troubleshoot so that you can
manually control the phone (not in a call), the phone should be in local mode. In local
mode, the phone’s software is not running and it will not search for a pilot. To switch

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between normal and local modes, use the “Phone Control” dialog box as shown below.
This setting will be lost if the phone is powered down.

To add a baseband test tone to the AMPS transmitter

To add a baseband test tone to the AMPS transmitter, open the “Test Tone” dialog box as
shown below and set the parameters as desired.

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APPENDIX B: Definitions

ACPR: Adjacent Channel Power Ratio. A ratio of power at an offset frequency as com-

pared to the power at the center frequency.

ADC: Analog to Digital Converter

AGC: Automatic Gain Control

AFC: Automatic Frequency Control

CW: Continuous Wave. This is a pure sine wave with no modulation such as CDMA or

FM.

DAC: Digital to Analog Converter

dB: A power ratio. Formula is 10log(power1/power2). It is used to denote differences,

such as gain or loss. Power1 and power2 are in linear units such as W or mW.

dBm: A unit for an absolute power level. Formula is 10log(power in mW/1 mW).

LNA: Low Noise Amplifier

LO: Local Oscillator. This is a CW signal used to mix signals up or down to a different fre-

quency.

PA: Power Amplifier

PDM: Pulse Density Modulation. This is used for control signals. The density of a stream

of digital voltage pulses is varied proportionally to the desired control level, then it is
converted to an analog voltage used as the control signal.

PLL: Phase Locked Loop. Used in Synthesizer circuits to generate an LO.

PPM: part per million

RSSI: Received Signal Strength Indicator

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APPENDIX C: Block Diagrams

Figure 11: Transmitter Block Diagram

Figure 12: Receiver Block Diagram

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Figure 13: Synthesizer Block Diagram

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°

°

°

°

CCS Techni cal Documentation Troubleshooting — RF

824.04 - 848.97 MHz

TX I

TX VH F LO

CELL 346.2 MHz
PCS 416.2 MHz

TX Q

RX I

TX IF
CELL 173.6 MHz
PCS 208.1 MHz

0

1

2

90

TX Block

UHF LO

CELL 997.14 - 1022.07 MHz, 30 kHz Step
PCS 2058.10 - 2118.05 MHz, 50 kHz Step

CELL

1850.00 - 1909.95 MHz

PCS

30 kHz Steps

50 kHz Steps

RX VHF LO

CELL 256.2 MHz
PCS 256.2 MHz

RX Q

0

1

2

90

RX Block

RX IF
CELL 128.1 MHz
PCS 128.1 MHz

869.04 - 893.97 MHz

CELL

1930.00 - 1989.95 MHz

PCS

30 kHz Steps

50 kHz Steps

Figure 14: Frequency Plan

Figure 15: Distribution of VCTCXO tone at 19.2 MHz

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ut

1

1

D

D

Troubleshooting — RF CCS Technical Documentation

UHF LO-inputs

.35V reference voltage

RBIAS SSB MIXER

TX_IF_AGC_R EF

TX_IF_AGC

cellular

PACTRL_RB

TX_GATE

PACTRL_ICEL

PACTRL_IPCS

PCS

TX_PA_AGC

BIAS

o

90

gain

control

driver output

TX_RF_AGC

RBIAS driver

gain

control

o

90

driver output

o

90

UPLEX_BAN

FILSEL1

FILSEL2

PCSCTRL

DEAF_CH_EN

PD_CELL

PD_PCS

CONTROL

o

90

TEST2
TEST1

EXT VCO input

PLL_TESTN
PLL_TESTP

VHF

REGISTER 5

2

REGISTER 4

REGISTER 3

REGISTER 2

RF_BUS_EN1X
RF_BUS_DATA

RF_BUS_CLK

SIO

interface

Reset

REGISTER 1

REGISTER 0

I-input

:

loop

divider

MUX

BIASING

PWR1

PWR2

PWROUT

Q-input

RBIAS PLL

Figure 16: Detailed Robin Block Diagram

VCO

pump

charge

phase

detector

MUX

TEST

divider

reference

oscillator input

digital test output

9.2 MHz reference

VHF VCO ta n k

VHF charge-pump o

VCO BAND SWITCH

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Figure 17: Detailed Batman Block Diagram

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Figure 18: Block Diagram for both Cumulus (Cell PA) and Nimbus (PCS PA)

APPENDIX D:
Descriptions of selected components, signaling, and
architecture

Robin (N601) Key Features

- Transmitter chip: both Cell & PCS

- Supports IS95, IS2000 & AMPS

- Input is baseband IQ signal, output is RF signal. Contains IF circuitry

- 84 ball TFBGA

- has 2 upconverters (BB to IF IQ modulator, IF to RF)

- contains on-chip VHF LO

- contains RF and IF Variable Gain Amplifiers, and part of circuitry for PA gain control

- contains op-amp as part of power detection circuit

- has serial interface for control by external digital controller

- 2.7v and 4.7v for analog functions, 1.8v for digital functions

Robin (N601) Signaling

-PCS_CTRL: 1=channels 25-599, 0=channels 600-1175. Output of Robin to Hornet

-PD_Cell & PD_PCS:. Robin output to Tomcat and Hornet, powers down those chips.
0=off, 1=on

- FALSE_DET: Used by UEM to monitor VR2 to ensure it is low when it should be (i.e.,
phone not transmitting when it’s not supposed to be)

- TX_GATE: used to turn on various blocks. Used with puncturing, and to turn on power
down circuits. Input to Robin.

- VREFRF02: Robin input, voltage reference from UEM. Should be 1.35v

- FILSEL1 and FILSEL2: control lines which enable Robin to control the switch N605.

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These lines are Robin outputs.

-FilSel1 Fil Sel2

0 1 channels 25-599

1 0 channels 600-1175

- P_DET: Voltage output of power detector, input to Robin.

- P_REF: Voltage reference from a diode which is the same type as used in power detec­tor.

Used to obtain temperature variations of diode in order to cancel out temperature
variations from power detector data. Input to Robin.

- PWROUT: This is an analog Robin output that is proportional to transmitted power (the
output of an op amp which subtracts P_REF (reference data) from P_DET (power detector
data))., goes to UEM.

- IREF_CEL/IREF_PCS: (names within Robin: PACTRL_ICEL and PACTRL_IPCS) Output
from Robin to PA. Within Robin, it’s the output of a current mirror that is used to control
PA gain. (Therefore the PA_AGC is an input to Robin.)

- TX IF AGC: This is a PDM controlled line. The higher the PDM value the lower the gain.

- TX RF AGC: This is a PDM controlled line. The higher the PDM value the lower the gain

- PA AGC: This is a PDM controlled line. The higher the PDM value the higher the gain

PCS TX Split Band Filter Z601

Due to the close separation between RX and TX bands in PCS compared to the width of
the RX and TX bands, a single filter in PCS is not available that gives the required rejec­tion in the RX band, with the required insertion loss in the TX band. Therefore, two filters
are used, which are housed in the same package. One filter is for the lower half of the
band (channels 25-599), and the other filter is for the upper half of the band (channels
600-1175). Switching circuitry selects the correct path depending on the channel.

Batman (N701) Key Features

- Receiver chip: both Cell & PCS; IS95, IS2000& AMPS

- Input is IF signal, output is baseband IQ

- 84 ball UFBGA

- IF to BB downconverter

- Contains on-chip VHF LO

- Contains IF Variable Gain Amplifier

- Contains baseband filters (BBFIL) and baseband amplifiers (BBAMP) Has digital inter­face for control by external digital controller

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Batman (N701) Signaling

- BAND_SEL: 1=PCS, 0=Cell. Batman output that controls external UHF VCO

- GAIN_CTL: output that controls Alfred LNA. 1=LNA high gain, 0=LNA low gain

- IF_SEL: Output that controls Alfred. 1=AMPS, 0=CDMA

- PURX=power up reset. Batman input.
VREFRF01: voltage reference input from UEM. Should be 1.35v

PA Key Features: Shark (N801, Cell) and Snapper (N802, PCS)

- PAs are 50 ohm input/output with internal DC block.

- MODE signal sets the PA into boost (mode=0) or non-boost (mode=1). Boost mode
causes the PA to draw more current in order to improve linearity (which decreases Power
Added Efficiency). Boost Mode is used in CDMA (both IS2000 and IS95, both Cell & PCS)
above +21 dBm transmit power.

- Biased directly from battery.
IREF: input to PA from Robin that controls gain of PA.

LNA/Downconverter (N750) Key Features

Alfred (N750) Key Features

- Front end Receiver chip

- Contains PCS and Cell band fixed gain LNAs that can be switched in or out.

- Contains PCS and Cell band RFAs

- Contains RF to IF downconverter

- Contains fixed gain IF amplifiers, one for CDMA (PCS and Cell) and one for AMPS

Hornet (N602) and Tomcat (N603)

Hornet (PCS) and Tomcat (Cell) are driver amplifiers whose outputs are connected to the
TX filters. Hornet has one input and two outputs, since the output is connected to the
split band filter. Both are powered directly from the battery.

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APPENDIX E: AGC Algorithms

Figure 19: CDMA (Cell and PCS) AGC Algorithm

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10 20 30 40 50 60 70 80

0

20 30 10

4 5 6

2

12 16 8

AMPS PWR LEVEL

Troubleshooting — RF CCS Technical Documentation

GAIN dB

90

AMPS AGC

IF AGC

TOTAL

0

-40

-30

-20

-10

Output Power dBm

Figure 20: AMPS AGC Algorithm

PA AGC

RF AGC

7

3

24

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