Nokia 2270, 2272, 2275, 2285 Service Manual 10 rf
CCS Technical Documentation
RH-3 Series Transceivers
Troubleshooting - RF
Issue 1 06/2003 Confidential Nokia Corporation
RH-3
Troubleshooting - RF CCS Technical Documentation
Page 2 Nokia Corporation Confidential Issue 1 06/2003
RH-3
CCS Technical Documentation Troubleshooting - RF
Contents
Page No
RF Troubleshooting ....................................................................................................... 5
RH-3/RH-3P General Troubleshooting Notes .............................................................5
Conditions of Phone ....................................................................................................5
TX Power Low.......................................................................................................... 5
Receiver Not Working Properly................................................................................ 6
Phone Cannot Make a Call........................................................................................ 6
Transmitter Troubleshooting .......................................................................................7
Cell Transmitter......................................................................................................... 7
PCS Transmitter...................................................................................................... 14
Receiver Troubleshooting ..........................................................................................21
Cell Receiver........................................................................................................... 21
PCS Receiver........................................................................................................... 28
GPS Troubleshooting .................................................................................................36
GPS Receiver .......................................................................................................... 36
GPS RF Quick Fault-finding Chart......................................................................... 39
Block Diagrams............................................................................................................ 40
Transmitter .................................................................................................................40
Receiver .....................................................................................................................40
Synthesizer .................................................................................................................41
GPS ............................................................................................................................41
Frequency Plan ..........................................................................................................42
Jedi .............................................................................................................................42
Yoda ...........................................................................................................................43
Description of RF ASICs............................................................................................. 43
Jedi (N601) ................................................................................................................43
Yoda (N700) ..............................................................................................................44
Alfred (N901) ............................................................................................................44
Orca (N803) ...............................................................................................................44
Shamu (N802) ............................................................................................................44
GPS ASIC (N054) .....................................................................................................44
Probing Diagrams ........................................................................................................ 44
Tuning Descriptions..................................................................................................... 50
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Troubleshooting - RF CCS Technical Documentation
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RH-3
CCS Technical Documentation Troubleshooting - RF
RF Troubleshooting
RH-3/RH-3P General Troubleshooting Notes
When troubleshooting the receiver, first check the RX_AGC PDM value. The AGC value
should be close to the typical values in the tables. Since the RX AGC will try to keep a
constant amplitude at the output of the receiver chain, if the AGC value indicates an
AGC gain that is substantially higher than normal, then the AGC is compensating for
extra loss in another component. If the AGC PDM values are normal, but there is still a
problem, check the actual AGC voltages. RF probing at specific locations in the chain can
then help to pinpoint the source of the problem.
Likewise, when troubleshooting the transmitter, first check the measured output power
and AGC values, which will give an indication of where to start probing.
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 signallevel information are given for each point in the receiver and transmitter chains, the
troubleshooter is not expected to probe each point on every phone — only the suspected
trouble spots.
Absolute power measurements were made with an Agilent (HP) 85024A active highimpedance probe. Other probes can be used (but should be high-impedance so that the
measurement does not load the circuit) but may very well have a different gain; therefore, adjust the absolute measurements accordingly. Also, adjust if using a probe attenuator.
Where a range is given for loss, typically the higher loss occurs at the band edges. Probing is not a very accurate method to measure absolute power; therefore, you cannot
expect measured results to exactly match the numbers listed here.
Power depends on the impedance of the circuit. For example, if a filter has a nominal loss
of 5 dB, then straightforward probing on the input and output, then subtracting, might
not result in 5 dB because the input impedance might be different from the output
impedance. Most components in the RF section have the same input and output impedance (50 ohms), but where this is not the case, absolute power is noted in the tables in
dBm, rather than loss or gain in dB.
When testing the CDMA receiver, it is easier to inject a CW tone into the receiver. The
gains and losses will be the same for a CW signal as for CDMA.
Note: After opening the shield lids, allways replace them with new lids.
Conditions of Phone
TX Power Low
If TX power is low, turn on transmitter in local mode using Phoenix. Check:
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Troubleshooting - RF CCS Technical Documentation
1 Current (0.7 - 1 A for max power, mode, and channel dependent).
2 Perform visual inspection of PWB under microscope to check proper placement,
rotation, and soldering of components.
3 Look for presence of TX signal on spectrum analyser at the correct frequency. If
signal is not on frequency, check in 100 MHz span. If signal is present but offfrequency, check synthesizer. If signal is not present, or present but low in amplitude, use probing tables to determine where in the chain the fault occurs, with
AGC PDMs set for known transmit power as listed in the tables.
4 Check that AGC PDMs are set for desired TX power and ensure AGC voltages are
correct.
5 Check the LOs for proper frequency and amplitude.
6 Ensure power supplies to transmitter have correct voltage.
Receiver Not Working Properly
If Receiver is not working properly, turn on receiver in local mode and check:
1 Turn on receiver with Phoenix, inject a signal into the receiver.
2 Check the AGC PDM.
3 Perform a visual inspection of the PWB under a microscope to check proper
placement, rotation, and soldering of components.
4 Measure signal levels at various points in the chain and determine where in the
chain the fault lies.
5 Check the LOs for proper frequency and amplitude.
6 Ensure power supplies to receiver have correct voltage.
Phone Cannot Make a Call
If phone won't make a call:
1 Ensure phone is in normal mode (i.e., ensure the phone is searching for a signal,
net server is on).
2 Ensure Preferred Roaming List (PRL) is loaded into phone.
3 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.
4 Ensure call box channel is set for a channel in PRL, and ensure SID is correct.
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CCS Technical Documentation Troubleshooting - RF
5 Ensure MIN, MDN, and SID are entered into the phone.
6 Ensure VCTCXO is centered, as described in VCTCXO tuning description.
7 Ensure transmitter and receiver are working properly by checking them in local
mode.
Transmitter Troubleshooting
Cell Transmitter
Cell Transmitter Path
The following table indicates the test points to probe when troubleshooting the cell
transmitter path. The steps shown are the recommended but do not have to be followed
in that order. Refer to the Appendix for a reference diagram that illustrates the test
points on the circuit board. An HP high frequency probe is used to make the frequency
and output power measurements.
Constant Reference
Values
CELL Oscillator and IF:
VHF Tx Lo
457.2
VHF Rx Lo
367.2
Setup:
Mode
Local On On PCS/CELL CDMA GenIO 8 = H TxIF and RF
Tx Rx Band
Chnn Tx Freq Rx Freq UHF GenIO 12 = L
384 836.52 881.52 1065.12 GenIO 13 = L
600 1880 1960 2143.6
Tx IF
228.6
Rx IF
183.6
CW or
CDMA
BB GenIO PDM Rho
AGC = 0
On
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Troubleshooting - RF CCS Technical Documentation
Step # Part Part Ref Label Test Point
1 Jedi Pin 7 I+ J601 0.1 to 0.9,
2 Jedi Pin 8 I- J602 0.1 to 0.9,
3 Jedi Pin 4 Q+ J603 0.1 to 0.9,
4 Jedi Pin 5 Q- J604 0.1 to 0.9,
5 Jedi Pin 45 IF CELL- top-C603 -45, 228.6 dBm/30kHz,
6 Jedi Pin 46 IF CELL+ bottom-C603 -45, 228.6 dBm/30kHz,
7 Jedi Pin 31 CELL_DRVout pin 1-Z601 -38 dBm/30kHz
8 Z601 Pin 3 SAW out pin 3 -40 dBm/30kHz
9 Orca Pin 2 RF in pin 3-Z601 -40 dBm/30kHz
10 Orca Pin 8 PA out left-R814 -17.5 dBm/30kHz
Typical
Value
1.7
1.8
1.9
1.10
Units Comments
VAC, VDC Test Point on
VAC, VDC
VAC, VDC
VAC, VDC
MHz
MHz
BB side
11 Z802 Pin 1 Iso Out=Dup Inpin 11-Z803 dBm/30kHz This test point
is inaccessible
12 Z803 Pin 8 Dup-Ant pin 8 -19 dBm/30kHz This point is
only accessible if the CELL
duplexer can
shield is
removed
13 Z800 Pin 3 Diplexer left-L802 -19
Cell Power Amplifier
The table above is the path that one would take to determine where the problem is in the
transmitter path. There are other circuits that affect the operation of the transmitter
path; for example, the power amplifier (PA) has the DC/DC converter (PMIC device)
which controls it. The following tables illustrate the circuits that have an effect on the
transmitter path and how to troubleshoot them.
The following table illustrates the PA troubleshooting information.
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CCS Technical Documentation Troubleshooting - RF
PA Power and Gain Measurements
Power Amplifier Input
Test Point
pin3-Z601 right-R814
PA Power and Gain Specifications
Power
Mode Name
Gain mode 0 V0 up to 9 23.8 0.75- 0.88 C806
Gain mode 1 V1 9 to 13 25.2 1.125- 1.375 C806
Gain mode 3 V2 Not used Not used 2 - 2.5 C806
Gain mode 2 Bypass 13 up 29 3 - 4 C806
Overall Gain V0 to
Bypass
unit N/A dBm dB VDC N/A
Output
Range
9 3.5 to 7.3
Power Amplifier Output
Test Point
Nominal
Gain
+/- 0.5
Vcc Range
Vcc Test
Point
* Depends on VBATT
Cell PMIC
The following table illustrates the PMIC troubleshooting information.
PA Gain Step
Gen IO 12 GenIO13
LL0.8V0
HL 1.2V1
LH2.2V2
HH3.7Bypass
Setup:
Mode
Local On On PCS/CELL
Tx Rx Band
PA Vcc
volt (v)
Spec
Name
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Measurements:
Pin Label Test Point Units
1 EP Pin 1 1.8 UPP IC enable = GenIO 10
2 M0 Pin 2 1.8 UPP Control 0 = GenIO 12
3 M1 Pin 3 1.8 UPP Control 1 = GenIO 13
4NCNCNCNCNC
5 FB Pin 5 0.75 - 4 M0, M1 See PA worksheet. Output to fly-
6 FB Pin 6 0.75 - 4 M0, M1 Shares PWB pad with pin 5
7 BYPVout bottom-
C808
8 VDD right-L810 VBATT VBATT Digital DC supply, shared with
9 VSS GND GND GND Digital GND, shared gnd with pin
10 NC NC NC NC NC
11 Vbgap NC NC NC Bandgap voltage output
0.75 - 4 M0, M1 PMIC bypass output used at Pout
Depends
on
Comments
back inductor
> 12 dBm
pin 12, 14, 15
13
12 VDD right-L810 VBATT VBATT Digital DC supply
13 Vss GND GND GND Digital GND, shared gnd with pin
9
14 Vsw right-L810 VBATT VBATT Switcher supply
15 Vsw right-L810 VBATT VBATT Switcher supply
16 Gsw GND GND GND Switcher GND, does not share
with pin 9 and pin 13
Good phone PMIC
Resistances
Pin Resistance
160k
275k
380k
41.59M
51.6M
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CCS Technical Documentation Troubleshooting - RF
Good phone PMIC
Resistances
Pin Resistance
62M
72M
82M
90.1
10 100
11 115 k
12 60k
13 0.2
14 1.3M
Cell IF and RF AGC and PA Control
The following table illustrates the PDM values and their typical values for the IF AGC, RF
AGC Jedi Pout, Gain steps, and the PA VCC levels. It also shows the typical power output
at the RF connector.
15 1.18M
16 0.1
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.
Cell CDMA Chnn 384
TX RF AGC TX IF AGC Jedi Po
PA Gain
Step
PA Vcc
Con
Typi
PDM
cal
Valu
Test
Point
PDM
e
-324 0.41 Bottom
C606
-226 0.56 -226 0.56 -21 H H 3.61 28 20
-146 0.68 -146 0.68 -21 H H 3.67 28 15.1
-146 0.68 -146 0.68 -27 H L 1.2 26 13
-111 0.74 -111 0.74 -28 H L 1.2 25.8 10.3
-111 0.74 -111 0.74 -28 L L 0.82 24.5 9
-6 0.9 -6 0.9 -35 L L 0.82 0
52 1 52 1 -45 L L 0.82 -10
105 1.09 105 1.09 -54 L L 0.82 -20
180 1.09 180 1.21 -64 L L 0.82 -30
266 1.36 266 1.36 -74 L L 0.82 -40
-324 0.41 Top
Typi
cal
Valu
e
Test
Point
C605
Typi
cal
Valu
Test
Point
e
-17 pin 1
Z601
Gen
IO
13
Typi
cal
Valu
e
Test
Point
PA
Gain
Gen
IO
12
H H 3.47 C806 DM 25
n RF
Pout
353 1.5 353 1.49 -83 L L 0.82 -50
Cell Power Detector
The following tables illustrate the measurements required for troubleshooting the Cell
power detector.
Setup:
Mode Tx Rx Band Chnn Rho
Local On On PCS/CELL 600/384 On
Input Chnn Tx Freq Rx Freq
384 836.52 881.52
600 1880 1960
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Measurements:
CELL, Channel 384
TX
ADC
RF/IF
pdm
353 L L -50 -86.3 right
140 L L -25 -63 2 235
-5 L L 0 -41 1.998 235
-105 L L 9 -30 1.967 250
-105 H L 10 -29 1.957 268
-143 H L 13 -26 1.93 286
-143 H H 14.9 -23.5 1.9 435
-175 H H 17 -21.5 1.86 486
-210 H H 19 -19 1.812 550
-246 H H 21 -17 1.745 630
PA Gain Step
GIO 12GIO
13
Conn RF
Pout
Power Detector Comments
Pout at
detector
Test
Point
R814
Det Out
2left
Test
Point
C807
mA
235 CELL band and
Det=Detector
Po=Power
detector coupling is about
22 dB
-286 H H 23 -15 1.667 730
-330 H H 25 -12 1.547 860
-352 H H 26 -11.5 1.485 950
-365 H H 26.5 -11 1.44 1000
-387 H H 27.5 -10 1.36 1095
none dBm dBm/
30kHz
Detector Reference and DC Supply
Label Test Point
Det Ref left-C803 2
Det Supply bottom-C257 2.8
VDC dBm only
Typical
Value
refers to total
power measured
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Detector Reference and DC Supply
PCS Transmitter
PCS Transmitter Path
The following table indicates the test points to probe when troubleshooting the PCS
transmitter path. The steps shown are the recommended but do not have to be followed
in order. Refer to the Appendix for a reference diagram that illustrates the test points on
the circuit board. An HP high-frequency probe is used to make the frequency and output
power measurements.
Label Test Point
Constant Reference
Values
PCS Oscillator and IF:
VHF Tx Lo
527.2
VHF Rx Lo
367.2
Typical
Value
VDC
Tx IF
263.6
Rx IF
183.6
Setup:
Mode Tx Rx Band
Local On On PCS/CELL CDMA GenIO 8 = H Tx IF and
Chnn Tx Freq Rx Freq UHF GenIO 12 = L
384 836.52 881.52 1065.12 GenIO 13 = L
600 1880 1960 2143.6
PCS TX
Step
#
1 Jedi Pin 7 I+ J601 0.1 to 0.9,
Part Part Ref Label Test Point
CW or
CDMA
BB GenIO PDM Rho
RF AGC = 0
Typical
Value
1.7
Units Comments
VAC, VDC
On
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CCS Technical Documentation Troubleshooting - RF
PCS TX
Step
#
2 Jedi Pin 8 I- J602 0.1 to 0.9,
3 Jedi Pin 4 Q+ J603 0.1 to 0.9,
4 Jedi Pin 5 Q- J604 0.1 to 0.9,
5 Jedi Pin 45 If PCS- top C604 -44, 263.6 dBm/30kHz,
6 Jedi Pin 46 IF PCS+ bottom
7 Jedi Pin 31 PCS_DRVout_A bottom
8 Jedi Pin 31 PCS_DRVout_B right L605 -30, 1880 dBm/30kHz,
Part Part Ref Label Test Point
C605
L604
Typical
Value
1.8
1.9
1.10
-44, 263.6 dBm/30kHz,
-51, 1880 dBm/30kHz,
Units Comments
VAC, VDC
VAC, VDC
VAC, VDC
MHz
MHz
MHz
MHz
A output is for
chnns 25 to 599.
This measured
power is leakage.
B output is for
channs 600 to
11 75
9 Z602 Pin 1 SAW out A pin3 N602 -56 dBm/30kHz The outputs of
Z602 and the
inputs to N602
are difficult to
reach
10 Z602 Pin 3 SAW out B pin 1 N602 -32 dBM/30kHz If not necessary,
skip to the PA
input measurement
11 Shamu Pin 4 RF in left C640 -32 dBm/30kHz
12 Shamu Pin 8 PA out left R803 -9 dBm/30kHz Accessible only if
Isolator shield
can is removed
13 Z801 Pin 6 Iso Out=Dup In none none dBm/30kHz Accessible only if
PCS duplexor
shield can is
removed
14 Z804 Pin Rx ant none none dBm/30kHz Accessible only if
PCS duplexor
shield can is
removed
15 Z800 P3 Diplexer left L802 -14 dBm/30kHz
PCS Power Amplifier
The preceding table is the path that one would take to determine where the problem is in
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the transmitter path. There are other circuits that affect the operation of the transmitter
path; for example, the power amplifier (PA) has the DC/DC converter (PMIC device) that
controls it. The following tables illustrate the circuits that have an affect on the transmitter path and how to troubleshoot them.
The table below illustrates the PA troubleshooting information.
PA Power and Gain Measurements
Power Amplifier Input
Test Point
right C640 * left R803 ** right C804
* inaccessible unless shield can is removed (no lid)
** This is the coupled power. You must 30 dB to get correct value
PCS PA Power and Gain Specifications
Mode Name
Gain mode 0 V0 up to 8 22.4 0.75 - 0.88 C806
Gain mode 1 V1 8 to 12 24.4 1.125 - 1.375 C806
Gain mode 3 V2 Not Used Not Used 2 - 2.5 C806
Gain mode 2 Bypass 12 up 28 3 - 4 C806
Overall gain VO to
bypass
Power Amplifier Output
Test Point 1
Power
Output
Range
8 3.6 to 7.6
Nominal
Gain
+/- 0.5
Power Amplifier Output
Test Point 2
Vcc Range
Vcc Test
Point
unit dBm dB VDC N/A
Phoenix Control and Example Values
PA Gain Step PA Vcc
GenIO 12 GenIO 13 volt (v)
LL0.8V0
HL 1.2V1
LH2.2V2
HH3.7Bypass
Spec
Name
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CCS Technical Documentation Troubleshooting - RF
PCS PMIC
The following table illustrates the PMIC troubleshooting information.
Setup:
Mode Tx Rx Band
Local On On PCS/CELL
Measurements:
Pin Label Test Point Units
1 EP Pin 1 1.8 UPP IC enable = GenIO 10
2 M0 Pin 2 1.8 UPP Control 0 = GenIO 12
3 M1 Pin 3 1.8 UPP Control 1 = GenIO 13
4NCNCNCNCNC
5 FB Pin 5 0.75 - 4 M0, M1 See PA worksheet. Output to fly-
6 FB Pin 6 0.75 - 4 M0, M1 Shares PWB pad with pin 5
7 BYPVout bottom
C808
8VDD right
L810
9 VSS GND GND GND Digital GND, shared gnd with pin
10 NC NC NC NC NC
11 Vbgap NC NC NC Bandgap voltage output
0.75 - 4 M0, M1 PMIC bypass output used at Pout
VBATT VBATT Digital DC supply, shared with
Depends
on
Comment
back inductor
> 12 dBm
pin 12, 14, 15
13
12 VDD right
L810
13 Vss GND GND GND Digital GND, shared gnd with pin
14 Vsw right
L810
15 Vsw right
L810
16 Gsw GND GND GND Switcher GND, does not share
VBATT VBATT Digital DC supply
9
VBATT VBATT Switcher supply
VBATT VBATT Switcher supply
with pin 9 and pin 13
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