Nokia 8280 Service Manual 7 rh10trouble

CCS Technical Documentation

RH-10 Series Transceivers

Troubleshooting

Issue 1 09/2002 Confidential Nokia Corporation

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Troubleshooting CCS Technical Documentation

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CCS Technical Documentation Troubleshooting

Contents

Page No

Transmitter Troubleshooting.......................................................................................... 5

Tuning Information........................................................................................................ 5

ST Batman VHFPLL ...................................................................................................5

ST TX Detector Cell ....................................................................................................5

ST Robin VHFPLL Cell ..............................................................................................6

SN Cell PA Temp ........................................................................................................6

SN Cell RX BB Filter ..................................................................................................7

SN Cell RX DC Offset I (or Q) ...................................................................................7

SN AMPS RX BB Filter ..............................................................................................7

SN AMPS RX DC Offset I (or Q) ...............................................................................7

Test TX Start-up Current .............................................................................................8

Test TX Start-up Amplitude ........................................................................................8

TN VCTCXO Frequency .............................................................................................8

TN TX DC Offset Reference Power ..........................................................................10

TN TX DC Offset Carrier Suppression .....................................................................11

TN TX IF AGC Cell Po (O) [or (1), (2), (3), or (4)] .................................................11

TN PA Gain Cal Cell Po (0) [or, (1), (2), (3), (4), or (5)] .........................................12

TX TX IF 11 dBm Set CELL Po ...............................................................................13

TN TX RF AGC Cell Po (0) [or (1), or (2)] ..............................................................14

TN TX Gain Comp Cell Po MD (or LO, LM, ML, MH, HM, or HI) .......................14

TX IF 11 dBm Set CELL Po .....................................................................................15

TN TX RF AGC Cell Po (0) [or (1), or (2)] ..............................................................15

TN TX Gain Comp Cell (or PCS) Po MD (or LO, LM, ML, MH, HM, or HI) ........16

TN G_Offset Cell MD ...............................................................................................17

TN AMPS PL2 Po Mid (or Low, LowMid, MidLow, MidHigh, HighMid, or High) 17

TN AMPS PL3 (or 4, 5, 6, or 7) Po ...........................................................................18

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

HighMid, or High channel) ......................................................................................18

TN TX Limiting Cell CDMA2000: Po ......................................................................19

TS ACPR Cell — Low ..............................................................................................19

TN RX IF AGC RXdBCtr (0) [or (1) or (2)] .............................................................19

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

HI) ............................................................................................................................20

Final UI Test: Rho .....................................................................................................20

Final UI Test: Frame Error Rate (FER) .....................................................................20

Final UI Test: SINAD ................................................................................................20

Probing/Troubleshooting ............................................................................................. 21

Overview ....................................................................................................................21

Probing Tables ...........................................................................................................22

Probing Diagrams ......................................................................................................29

Phoenix Instructions ..................................................................................................30

Turning on Cell CDMA Transmitter....................................................................... 30

Turning on AMPS Transmitter ............................................................................... 31

Turning on Receiver Only....................................................................................... 32

Verifying a Single Manual Tuning.......................................................................... 33

Adjusting PDM Values for AGCs and AFC........................................................... 33

Reading Tuning Values from the Phone................................................................. 34

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Reading RSSI and AGC PDM Values from the Phone .......................................... 34

Loading PRLs into the Phone.................................................................................. 35

Changing Between Local Mode and Normal Mode................................................ 35

Baseband Test Tone for AMPS Transmitter Tests.................................................. 36

Block Diagrams .........................................................................................................37

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Transmitter Troubleshooting

The Diva troubleshooting section includes tuning information, troubleshooting test,
probing points, and block diagrams.

Tuning Information

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 2), 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: Check C701, C714, R703, R702, C715, R704, V701, C716, L701, and
C702. Check power supplies to Batman, particularly check for 2.7v on VR5 at C710 and
on VR7 at C708. Check for 1.8v on VIO. If no fault is found, replace N701 (Batman).

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, and then each AGC
value is changed individually to ensure that the ADC changes as each AGC change is
made.

Manual Verification: Using Main Mode, turn on the Cell CDMA TX with the 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 self-test measures the power detector reading instead, but at
the present time it cannot be done with Phoenix. An easy way to check functionality
without removing the covers is to check transmitted power.) Transmitter 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).

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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 4.
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 the above cases fail,
troubleshoot the TX chain as described in this section.

If all the output powers pass, perhaps the test is failing because the ADC voltage is
wrong. The limit is 1.64v. If the voltages are wrong, then check the power detector at
R821, R801, R804, L801, C805, R806, R805, C803, V801, C804, 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 11, Figure 1), 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 space to see it since it may be far off frequency.

Troubleshooting: Check C612, C613, R607, R605, C632, R606, C638, L611, C631, C630,
V601, C629, V602, C637, R609, C618. Check power supplies to N601 (Robin), ensuring

2.7v on VR3 and VR6, and 1.8v on VIO. 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 thermistor R808,
and checks to make sure the phone is at room temperature. A phone should not be tuned
while it is either hot or cold.

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

Manual Verification: Ensure the phone is cool by letting it cool down for several minutes.
Retest, keeping in mind that if there is a short circuit on the board, the phone 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 before proceeding. If it still fails, there may be either a short on the board or 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
set limits.

Manual Verification: Use “RF Tuning” dialog box 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 set limits.

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

Manual Verification: Use “RF Tuning” dialog box 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
set limits.

Manual Verification: Use the “RF Tuning” dialog box 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 CDMA
receiver DC offsets until they are within the set limits.

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

Manual Verification: Using the “RF Tuning” dialog box 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 1a for AMPS Power Level 5 (for PCS, set output power
to +12dBm). Read the phone’s current on the power supply and check to see that it is
within the set 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, 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. Look for the hottests 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 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 set limits. The frequency of the signal may not
be accurate since the VCTCXO has not been tuned yet.

Troubleshooting: Check proper placement, rotation, and soldering of the components of
the TX chain, as shown in Figure 1. Check for the presence of LO tones as listed in
Table 2. Check for the 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 then is centered in frequency. This is done to the car­rier after it has been mixed up to 1880 MHz, since it is easier to measure the tolerance of

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1 ppm at 1880 MHz than it is at 19.2 MHz. Additionally, the tone at 1880 MHz can be
measured without taking the phone apart.

The result of this test is a PDM value for the AFC DAC, which must be within +/- 150,
corresponding to 2.2v on the VCTCXO control pin (pin 1) and the carrier centerd 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” dialog box 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 below.

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.) The values you enter into the Values
edit box are the AFC values that control the VCTCXO frequency. Start with a value of “0”,
adjusting until it is centered, staying within the set 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 ensuring 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 2.7v. 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 836.52 MHz is not,
troubleshoot Cell TX Chain 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 also troubleshoot this hardware, 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 pin2 at 0v), then
the VCTCXO (G501) is working correctly but the circuit that delivers the control
voltage is not. Check soldering of all G501 terminals; also check R510, R511,

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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 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 If there is a fault with both the AFC circuitry and the VCTCXO, then several com-

binations of the previously described conditions are possible. Start by ensuring

2.2v on pin 1 of G501, using a PDM within the range of +/- 150. Then center the
phone.

TN TX DC Offset Reference Power

Both this tuning and the next (TN TX DC Offset Carrier Suppression) are to adjust the
DC offset voltages on the I and Q inputs to the modulator 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 dialog box to set the AMPS
transmitter to channel 384. Using the RF Tuning dialog box, 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.
The 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 table/diagrams. If the two tones offset at 20 kHz are
not present, check for them with an oscilloscope on one of the four pads of probing
point 1 in Figure 1, being very careful not to short the pad to an adjacent pad. The fre­quency should be 20 kHz. If tone is not present on these four pads, then there is a prob­lem with D200 (UEM). If the tones are present at probing point 1 but not 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 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.

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TN TX DC Offset Carrier Suppression

(See TN TX DC Offset Reference Power) tuning section. This step reports the delta
between the reference at 836.52 + 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 dialog box, using the values listed below until the min­imum carrier maximum delta is found. Leave Q at 0. On the “Values” line, enter “I,Q”. The
appropriate values (in decimal) are:

-560

-504

-448

-392

-336

-280

-224

-168

-112

-56
0

56
11 2
168
224
280
336
302
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
minumum value determined above, until the delta is at least 35 dB.

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

TN TX IF AGC Cell Po (O) [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.

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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 dialog box under
the RF drop-down 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 Acceptable range for output power (in dBm)

(a) +300 decimal check tuning

(b) +150 results file

(c) 0 for limits

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)
above. This is the RF_AGC gain delta.

Leave the PA_AGC and TX_RF_AGC values as is; then enter the alues 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.

PDM for TX IF AGC

-200 check tuning results

-400 file for limits

Acceptable range for sum:[output power +
RF_AGC gain delta], in dBm

Troubleshooting: Check Robin (N801) and supporting components. Also check D400,
which generates the PDM signals. Check AGC PDM voltages according to Tables 1 and 4.
Troubleshoot the rest of the transmitter chain, if necessary.

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, TX TX IF 11 dBm Set CELL Po). 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).

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Manual Verification: Turn on the cell CDMA transmitter in Phoenix, using the RF Main
Mode dialog box, 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).

Note the value obtained in the step above as it will be needed in other Troubleshooting sections.

Write the PDM values listed in the following table 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 Acceptable range for output power (in dBm)

+218 decimal limit range for Po(5)

-12 limit range for Po(4)

-202 limit range for Po(3)

-268 limit range for Po(2)

-329 limit range for Po(1)

-366 limit range for Po(0)

Troubleshooting: If the power readings are low, check the AGC voltages as given in
Tables 1 and 4. You can also probe on the PA input as given in Table 2 to find out if the
power level is 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 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 (TN PA Gain Cal Cell Po (0) [or, (1), (2), (3), (4), or (5)]). 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.

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Manual Verification: See previous section.

Troubleshooting: See previous section.

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: Set up the transmitter as described in tuning 24.3 above.

Set the Cell PA PDM to -329.

Set the TX_IF_AGC to the value determined in tuning 24.3 above 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. Check to see that they are within the specified range.

PDM for TX RF AGC Acceptable range for output power, in dBm

-512 decimal check

-67 decimal limits

-22 decimal in tuning

+418 results

+511 file

Troubleshooting: Check Robin (N801) according to Tables 1, 2, and 4. 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.

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

Both this tuning and the next (TX IF dBm Set Cell Po) ensure 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
that 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.

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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 dialog box.

Using the Phoenix RF Tuning dialog box, 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.

Channel Cell

Low 991

LowMid 107

MidLow 245

Mid 384

MidHigh 512

HighMid 660

High 799

Troubleshooting: If -8 dBm cannot be attained, troubleshoot Cell TX.

TX IF 11 dBm Set CELL Po

See the previous tuning (TN TX Gain Comp Cell Po MD (or LO, LM, ML, MH, HM, or
HI)). 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: Set up the transmitter as described in tuning 24.3 above.

Set the Cell PA PDM to -329.

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Set the TX_IF_AGC to the value determined in tuning 24.3 above 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. Check to see that they are within the specified range.

PDM for TX RF AGC Acceptable range for output power, in dBm

-512 decimal check

-67 decimal limits

-22 decimal in tuning

+418 results

+511 file

Troubleshooting: Check Robin (N801) according to Tables 1, 2, and 4. Also check D400,
which generates PDM signals. Check AGC PDM voltages according to Table 1. Trouble­shoot the rest of the cell transmitter, if needed.

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

Both this tuning and the next (TN G_Offset Cell MD) ensure 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
that 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 dialog box.

Using the Phoenix RF Tuning dialog box, 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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CCS Technical Documentation Troubleshooting

Channel Cell

Low 991

LowMid 107

MidLow 245

Mid 384

MidHigh 512

HighMid 660

High 799

Troubleshooting: If -8 dBm cannot be attained, troubleshoot Cell TX.

TN G_Offset Cell MD

See previous tuning (TN TX Gain Comp Cell (or PCS) Po MD (or LO, LM, ML, MH, HM,
or HI)). This step reports G_Offset.

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

Manual Verification: See the previous tuning. This is the value of G_Offset needed to get

-8 dBm on the center channel.

Troubleshooting: If G_Offset is not within the limits, troubleshoot the Cell TX.

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 transceiver to
the channel that failed.

Using the Phoenix RF Tuning dialog box, 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, setting the TX AGC values to those
listed for Power Level 0 in Table 1.

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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 1 and 2 are the same as 0 for this phone.)

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

Manual Verification: Use the same procedure as in the previous tuning (TN AMPS PL2
Po Mid (or Low, LowMid, MidLow, MidHigh, HighMid, or High)), but on channel 384

note that the limits are different from the previous tuning.

Troubleshooting: Trouble the cell transmitter, setting the AGCs as in Table 1 for the power
level that failed.

TN TX Limiting Po Cell 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 IS95 mode. The
reason for this is to ensure that the phone never violates the SAR (Specific Absorption
Ratio) 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
transmitter set to each of the channels in the following list.

Using the RF Tuning dialog box, 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

Low 991

LowMid 107

MidLow 245

Mid 384

MidHigh 512

HighMid 660

High 799

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

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TN TX Limiting Cell CDMA2000: Po

This is the same as the previous tuning (TN TX Limiting Po Cell IS95, Low channel (or
LowMid, MidLow, Mid, MidHigh, HighMid or High channel)), except that CDMA2000

(C2K) modulation is used instead of IS95.

For an explanation of result, see the previous tuning.

Manual Verification: Same as the previous tuning, except choose the CDMA2000 tuning
in the RF Tuning dialog box.

Troubleshooting: Same as previous tuning.

TS ACPR Cell — Low

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

Manual Verification: Set up the measurement as described in section 42.3 but turn 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 section 42.3 and also the Cell TX troubleshooting guide. Cell
band TX decoupling capacitors are C653, C633, C649, C648, C619, C841, C817, C810,
C811, C803.

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

This tuning calibrates the RX IF AGC curve, because 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:

-87.5 dBm, -57 dBm, and -18 dBm

Manual Verification: With the phone in local mode, use the Main Mode dialog to turn on
the AMPS receiver set to channel 384. Using the RF Tuning dialog, 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 dialog box 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

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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. The AGC will try to keep the same amplitude
on Batman output; therefore, if the AGC value is larger than normal, this indicates that
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) 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. 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 dialog box.
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 both Cell and PCS, set the
amplitude to -95 dBm. Record RxdBCtr, which is returned from Phoenix in the lowest
field in the RF Tuning dialog box.

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
phone call, and is read directly from the call box. Rho is measured with the sector power
= -75 dBm. If Rho fails, check the signal purity of the LOs. Check synthesizer components
and power supply decoupling.

Final UI Test: Frame Error Rate (FER)

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

-104 dBm), is injected into the receiver, and the FER is recorded. FER is measured in per­centage (0.5% or lower is considered passing). Failures are most often caused by excess
loss/insufficient gain in the receiver chain. Failures may also be the result of excess noise
in the receiver. Check for correct signal levels and AGC values/voltages.

Final UI Test: SINAD

SINAD (Signal-to-Noise-and-Distortion) is similar to a sensitivity/FER measurement for
CDMA, but it is used in AMPS. A low-level signal (typically at sensitivity level of -116.0
dBm) is injected into the receiver, and SINAD is read off the call box. The passing limit is
12 dB.

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Probing/Troubleshooting

Overview

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

Probing is generally done in local mode, although situations may arise whereby the trou­bleshooter may need to probe while in a call. If this is done, be aware that in some cases,
probing may disturb the circuit so that the call drops.

The following tables list power levels for many combinations of AGC values; however, it
generally is only necessary to check one combination. 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
suspect trouble spots should be probed.

Absolute power measurements were made with an Agilent (HP) 85024A active high
impedance probe. While other probes may be used, it is strongly recommended that the
probe be high impedance so that the measurement does not load the circuit. Adjust
absolute measurements if the probe has a different gain or if a probe attenuator is used.

If a range is provided for loss, typically the higher loss occurs at the band edges.

Power depends on the impedance of the circuit. For example, if a circuit has a nominal
loss of 5 dB, then straightforward probing on the input and output, then subtracting,
might not result in 5 dB because the input impedance might be different from the output
impedance. 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
components in the RF section have the same input and output impedance (50 ohms), but
where this is not the case, absolute power is noted in the tables in dBm, rather than loss
or gain in dB.

When testing the CDMA receiver, it is easier to inject a CW tone into the receiver. The
gains and losses will be the same for a CW signal as for CDMA.

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Probing Tables

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

channel 384

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 -102 0.70 -11.2 +/- 3 dB -19 0.84 25.5 (PL0)

-409 0.17 -89 0.72 -13.2 +/- 3 dB -123 0.66 24.2 (PL3)

-409 0.17 -73 0.75 -15.4 +/- 3 dB -310 0.34 19.9 (PL4)

-249 0.44 -63 0.77 -19.2 +/- 3 dB -330 0.30 15.8 (PL5)

-104 0.70 -53 0.78 -22.4 +/- 3 dB -330 0.30 12.5 (PL6)

37 0.95 -48 0.79 -27.9 +/- 3 dB -330 0.30 8.2 (PL7)

-403 0.17 -115 0.66 -16 +/- 3 dB 220 1.27 25

-403 0.17 116 1.08 -42 +/- 3 dB -270 0.40 -2

200 1.23 124 1.09 -58 +/- 3 dB -331 0.29 -23

450 1.68 124 1.09 -65 +/- 3 dB -331 0.29 -39

511 1.78 207 1.24 -75 +/- 3 dB -331 0.29 -50

power on
Balun Out

CELL CDMA

PA AGC RF power

on RF con­nector

Note: AGC PDM values will change (sometimes drastically) as the phone warms up. The table lists
PDM values for initial power up. After 10 minutes at full power, PDM values will be different.

Probing Point

UEM (D200)
out=Robin (N601)
in

Table 2: RF/Analog Probing for Transmitter

Probing
Location on
the board

1, Figure 1 Use O-scope. For CDMA modula-

Probed Absolute Power (dBm) or
gain/loss (dB) or voltage (v)

tion turned on, 550 mV p-p, looks
like noise. For AMPS, with test tone
turned on.

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

D200, N601 (VR2,3,6,IO)

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Table 2: RF/Analog Probing for 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
the 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 1

3, Figure 1 See Table 1 T604, L613, C640, C642, L603,

4, Figure 1 Gain = 12-16 dB through Tomcat N603 (also ensure 3.6v on pin 5

5, Figure 1 Loss = 2-3 dB through SAW filter Z604, N603, N801 (Vbat)

6, Figure 1.
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 = 1 dB, but it will appear as
3-4 dB gain due to impedance dif­ference. On Robin output, you may
see amplitude imbalance between
2 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.
Check AGC voltages/PDMs), T604,
L604, L603, C640, C642, C620,
N603 (including check for 3.6v on
pin 5), D400 (including AGC volt­age)

L604, N601. C620, N603 (includ­ing: check PD_CELL high as in Table

2), N603 (including check for 3.6v
on pin 5 and 2.6v on pin 4)

and PD_CELL high as in Table 1b),
N601, C649, C639, Z604, N801
(Vbat)

N801 (including: check 3.6v on
Vbat, Z802, R821, R801, R804,
L801, C805, R806, R805, V801),
D400 (including AGC voltage),
N601 (since lref, also check
PA_AGC).

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

Cell duplexer
(Z803) out

7, Figure 1.
Probing here
not recom­mended unless
necessary; best
to measure on
RF connector

8, Figure 1.
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 Z802, C801, L812, X800. If no cable

Z802, N801 (Vbat), R821, R801,
Z803

connected to X800, then addition­ally: L802, R823, L803, R824

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Table 2: RF/Analog Probing for 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
the 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

10, Figure 1.
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power

11, Figure 1
(You can touch
top of plastic
to verify pres­ence of LO, but
this won’t
measure
amplitude
accurately.)

Power approx. -3 dBm If LO is present but off freq (could

be off by hundreds of MHz), then
VCO G502 is at least putting out a
signal. If LO not present, check
G502, R507, R505, R515 first. Else,
check C511, C501, C532, C550,
R550, C509, R503, C508, R508,
C518, N501, R506, C516, C515,
C521, R513, C504. Lastly, check
R523, R519, R509.

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

Voltage on Robin UEM output for mode with test turned on

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Voltage on UEM output for mode

Table 3: DC Probing for Transmitter

DC probing

Item to check Setting

TX RF AGC See Table 1 12, Figure 3 See Table 1 D400 (UPP), R433, C426, R434,

TX IF AGC See Table 1 13, Figure 3 See Table 1 D400 (UPP), R427, C422, R428,

PA AGC See Table 1 14, Figure 3 See Table 1 D400 (UPP), R430, C424, R431,

PD_CELL High for TX on,

Low for TX off

VREFRF02 fixed 50, Figure 1 1.36v D200, C606, N601

location on
board

49, Figure 1 High = 2.6v

Table 4: Receiver Probing (PDM and voltage)

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

PDM
lower limit

AMPS ch 384 LowGain 2 102 55 0.98 -65 dBm

PDM
upper limit

PDM mean

Voltage for
PDM mean

RX power in

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Table 4: Receiver Probing (PDM and voltage)

PDM
lower limit

AMPS ch 384 HighGain 127 215 173 1.19 -65 dBm

CELL ch 384 LowGain -1 106 60 0.99 -65 dBm

CELL ch 384 HighGain -119 -3 -64 0.78 -95 dBm

PDM
upper limit

PDM mean

Voltage for
PDM mean

RX power in

7 RSSI should be within +/- 2 dB of actual RX signal above -104 dBm and +2/-4dB

below -104 dBm

8 In AMPS, ensure 230 mV on I,Q traces of Batman out, probing point 38 of

Figure 3.

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

Table 5: 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
the board

Probed Absolute Power (dBm) or
gain/loss (dB)

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

32, Figure 1 Loss = 2-4 dB through duplexer Z803, L750, N750 (VRX)

33, Figure 2 Gain = 12-14 dB for high gain

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

34, Figure 2 Loss = -1-3 dB through SAW filter Z751, N750, R722, C750, R723,

10, Figure 1
Can probe on
top of plastic
to check for
presence of LO,
but won’t read
accurate
power

Approx -3 dBm If LO is present but off freq (could

N750. Also, IF_SEL low for CDMA
and high for AMPS. Ensure
GAIN_CTL high if RX power is
below the LNA switch point. Z751,
C755, L752, C757, R721, C753,
R723, C756

C756, L757, C758

be off by hundreds of MHz), then
VCO G502 is at least putting out a
signal. If LO not present, check
G502, L509, R505, R515 first. Else,
check C511, C501, C532, C550,
R550, C509, R503, C508, R508,
C518, N501, R506, C516, C515,
C521, R513, C504. Lastly, check
R523, R519, R509

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Table 6: 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
the 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

Item to check Setting

36, Figure 2 This point not 50 ohms. Will meas-

37, Figure 2 This point not 50 ohms. Will meas-

38, Figure 3 RSSI most useful N701 (VR5, VR7, VIO, ensure 1.35v

39, Figure 2 N701, C701, C714, R703, R702,

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

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

Table 7: DC Probing for Receiver

DC probing
location on board

DC voltage

N750. IF_SEL low for CDMA and
high for AMPS. R722, C750, L771,
R723, C756, L770, L757, C758,
L755, C769, C766, C784, L764,
C781, Z752

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

on VREFRF01; also check
RX_IF_AGC), R706, C704, R705,
R704, V701, C716, L701, C702,
C715, R702, C714, R703, C701

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

Items to check if voltage
incorrect

RX IF AGC See PDM set-

tings

GAIN_CTL High = LNA

high gain
Low = LNA low
gain

IF_SEL High = AMPS

Low = CDMA

40, Figure 3 See typical volt-

ages

55, Figure 2 High = 2.4v min

Low = 0.3v max

57, Figure 2 1.35v D200, C706, N701

D400, R436, C428, C435, N701

N701, N750, R721, C753

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Table 8: RF Probing for Cell CDMA 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
the board

Probed Absolute Power (dBm) or
gain/loss (dB)

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

VHF LO at

256.2 MHz

46, Figure 2 This point not 50 ohms. Will meas-

ure approx. -14 dBm for -52 dBm
input and RX AGC PDM = 225

47, Figure 2 This point not 50 ohms. Will meas-

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

38, Figure 3 Easiest to use RSSI N701 (VR5, VR7, VIO, ensure 1.35v

39, Figure 2 N701, C701, C714, R703, R702,

Table 9: RF DC Power Supplies

N750 and supporting components
(ensure BAND_SEL low for Cell
CDMA and high for PCS as in
Table 3d. Also, IF_SEL low for
CDMA), L754, C782, C767, C761,
C786, Z753

Z753, N750 and supporting com­ponents (including check for proper
voltages on Alfred signaling), L754,
C782, C767, L759, C770, C771,
C772, L760, L761, N701

on VREFRF01), R705, C704, R706,
C706, C701, C714, R703, R702,
C715, R704, V701, C716, L701,
C702

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

Supply Voltage Supplied Components

VR1A 4.75 VCTCXO, UHF PLL

VR1B 4.75 Robin

VR2 2.78 Robin, Power Detector

VR3 2.78 Robin, VCTCXO

VR4 2.78 UHF PLL

VR5 2.78 Batman

VR6 2.78 Robin, UHF PLL

VR7 2.78 Batman

VIO 1.8 Robin, UHF PLL

VRX 1.8 Alfred

VPLL 2.78 UHF PLL

VBAT 3.1-4.2 PA

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CCS Technical Documentation Troubleshooting

Probing Diagrams

Figure 1: Test Points

Figure 2: Test Points

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Troubleshooting CCS Technical Documentation

Figure 3: Test Points

Phoenix Instructions

Turning on Cell CDMA Transmitter

From the RF menu, select Main Mode from the drop-down menu. This opens the “Main
Mode” dialog box.

To turn on the transmitter, first turn on the carrier by highlighting “RX/TX” in the top
subwindow. (This also turns on the receiver.) Enter the appropriate channel in the “Chan­nel” subwindow and then click the Set button in the upper righthand portion of the dia­log box.

Next, turn on the modulation by opening the “CDMA Control” dialog box from the DSP
drop-down menu. The dialog box is shown here.

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CCS Technical Documentation Troubleshooting

Highlight “Rho” in the Functions subwindow at left, and check “Rho ON” in the State
field. Check either “Cell” or “PCS” in the Band field. Under Radio Configuration, choose
the desired configuration. (Note: C2K is an abbreviation for IS2000.) When you have
completed all the necessary information, click the Execute button.

Turning on AMPS Transmitter

Eventually, the method will be to use the “RF Main Mode” window, choosing “AMPS” in
the Band field. However, a current software problem exists 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 here, can be used.

Select the desired channel and power level, and check “Transmitter ON”. Click the Exe-
cute button.

Note: The reason why this is a temporary solution is because, in some instances, the AFC and AGC
are not disabled. The result is 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 Tool” dialog box, shown here.

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Choose the “Data” option in the Address space field; enter the address; leave the Sub­count (words) field entry at “1”; click the Add button. The address will be displayed in the
subwindow in the lower half of the dialog box.

Use this method to enter both the AFC Disable and AGC Disable addresses.

Note: AFC Disable and AGC Disable addresses may be obtained from R&D. These addresses may
change, depending upon software version.

Once both addresses are entered, check “Periodic Read on” and click the Stop button.

Click the Read button, which then displays the values in both addresses.

Note: Both addresses should be “1”.

Change both addresses to “0” by clicking on the “1”, which highlights the data in the
address. Next, you can edit the contents and make the change from “1” to “0”. Click the
Return key on your keyboard to enter the new values. Once the contents of both
addresses are changed to “0”, click the Write button on the “DSP Memory Test” dialog
box. This will write the new values into the phone. This data will remain in the phone
until the phone is powered down.

Turning on Receiver Only

To turn on the receiver only, use the “Main Mode” dialog box as described in the Turning
on Cell CDMA Transmitter section. Highlight “RX” in the Band field and then choose

“Cell CDMA”.

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CCS Technical Documentation Troubleshooting

Verifying a Single Manual Tuning

Open the “RF Tuning” dialog box, shown here.

Note: The tuning descriptions given in the Tun i n g section describe the tuning process and provide
information as to what values will be returned to you from the phone, if any.

According to these descriptions, click “Self-Tuning” for self tunings or “RF Tuning” for the
others. Choose the appropriate test from the “Tuning Names” list. Values that you must
enter are entered into the Values subwindow. If more than one value is entered, enter a
delay time (in seconds) in the Delay (Sec) field. This indicates the delay between applica­tions of the multiple values entered. Three seconds is sufficient time 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 grayed box at the
bottom of the dialog box). 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.

Adjusting PDM Values for AGCs and AFC

The following “PDM Control” dialog box has several sliders—one each for each of the
AGCs and the AFC. Use your mouse to move the slider pointer to the value that you want
to set. (Values are indicated in decimal format.) When completed, click the Set button.

(Alternatively, you can click the up and down arrows next to the value fields below the
sliders. This will increase or decrease the value one step at a time. If you use this method,
you do not have to click the Set button.)

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Reading Tuning Values from the Phone

Open the “Batch Tune” dialog box, shown here. To read the tuning values from the phone,
click the Read All button under the Phone heading. However, if you want the tuning val­ues to be displayed, you must first load the template file by clicking the Load File but­ton, which is located under the Parameter File heading.

Note: Ensure that the template file used is appropriate for the software version in the phone.

Reading RSSI and AGC PDM Values from the Phone

Open the “AGC Status” dialog box. Check the “Enable Trace” box. 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 fol­lowing diagram from right to left, IF_AGC, RF_AGC, PA_AGC.

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Loading PRLs into the Phone

Using the “Preferred Roaming List” dialog box, click the Load PRL From File button and
choose the desired file from the list that displays in the left side of the dialog box. (When
you choose your desired file, note that the text color changes to blue.) Click the Write
PRL To Phone button. At the bottom of the dialog box, a status message will indicate if
the file was loaded correctly.

Changing Between Local Mode and Normal Mode

To make a call, the phone should be in normal mode. When 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

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should be in local mode. When in local mode, the phone’s software is not running, and it
will not search for a pilot.

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

Baseband Test Tone for AMPS Transmitter Tests

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

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CCS Technical Documentation Troubleshooting

Block Diagrams

Figure 4: Transmitter Block Diagram

Figure 5: Receiver Block Diagram

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Figure 6: Synthesizer Block Diagram

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2 1

2 1

CCS Technical Documentation Troubleshooting

TX I

TX Q

RX I

RX Q

TX VHF

CELL

346.2

RX VHF

CELL

256.2

°

0

°

90

UHF LO

CELL

997.14 - 1022.07 MHz, 30 kHz

°

0

°

90

TX IF
CELL

TX

RX

RX IF
CELL

173.6

128.1

CELL

CELL

824.04 - 848.97
30 kHz

869.04 - 893.97
30 kHz

Figure 7: Frequency Plan

Figure 8: Distribution of VCTCXO tone at 19.2 MHz

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ut

1

1

D

D

Troubleshooting 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

VCO

pump

charge

phase

detector

MUX

TEST

divider

reference

digital test output

9.2 MHz reference

VHF VCO ta n k

VHF charge-pump o

VCO BAND SWITCH

oscillator input

Figure 9: Detailed Robin Block Diagram

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Figure 10: Detailed Batman Block Diagram

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Figure 11: Block Diagram for both Shark (Cell, AMPS, PA)

Figure 12: CDMA AGC Algorithm

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10 20 30 40 50 60 70 80 90

0

20 30 10

5 6

2

12 16 8

AMPS PWR LEVE L

CCS Technical Documentation Troubleshooting

AMPS AGC

IF AGC

TOTAL

GAIN dB

PA AGC

RF AGC

7

0

-40

-30

-20

-10

Output Power dBm

3 4

24

Figure 13: AMPS AGC Algorithm

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