Customer Care Solutions
RH-18/36/38 Series Transceivers
T roubleshooting Instructions
Issue 1 10/03 Nokia Corporation
RH-18/36/38 Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Page 2 Nokia Corporation. Issue 1 10/03
Baseband troubleshooting.............................................................................................. 5
Baseband test points ....................................................................................................5
Troubleshooting diagrams ...........................................................................................5
Phone is dead ...............................................................................................................6
Flash programming do not work ..................................................................................7
Power does not stay on or phone is jammed ................................................................8
Display information : "Contact Service" .....................................................................9
The phone do not register to the network, or the phone cannot make a call .............10
SIM related faults ......................................................................................................11
Insert SIM card fault ............................................................................................... 11
SIM-Card rejected................................................................................................... 12
Audio related faults 1: Earpiece and microphone ......................................................13
Audio related faults 2: Headset ..................................................................................14
Charging failure troubleshooting ...............................................................................15
Charging troubleshooting 2 .......................................................................................16
General RF Troubleshooting........................................................................................ 17
RF Key component placement ...................................................................................18
RH-36 Receiver troubleshooting ................................................................................. 21
General Instructions for GSM850 RX Troubleshooting ...........................................21
Troubleshooting diagram for GSM850 Receiver................................................... 22
General Instructions for RH-36 GSM1900 RX Troubleshooting ..............................24
Phoenix commands ................................................................................................. 24
Troubleshooting diagram for GSM1900Receiver................................................... 25
Measurement points in the receiver ........................................................................ 27
RH-36 Transmitter troubleshooting ...........................................................................29
Measurement points for the transmitter .................................................................. 29
General instructions for RH-36 GSM TX troubleshooting .......................................30
GSM850 TX output power...................................................................................... 31
General instructions for RH-36 GSM1900 TX troubleshooting ...............................32
Phoenix commands ................................................................................................. 32
GSM1900 TX output power.................................................................................... 32
Troubleshooting diagram for GSM1900 TX .............................................................33
General Instructions for RH-18/38 GSM900 RX Troubleshooting............................. 35
Troubleshooting Chart for GSM900 Receiver........................................................ 36
General Instructions for GSM1800 RX Troubleshooting .........................................38
Troubleshooting Chart for GSM1800Receiver....................................................... 39
Measurement points in the receiver ........................................................................ 40
RH-18/38 Transmitter troubleshooting ......................................................................42
Measurement points for the transmitter .................................................................. 42
General instructions for RH-18/38 GSM TX troubleshooting ..................................43
PCN Transmitter General instructions for PCN TX troubleshooting ........................45
Synthesizer .................................................................................................................46
26 MHz Reference Oscillator ( VCXO )................................................................. 46
VCO ........................................................................................................................ 46
Troubleshooting diagram for PLL Synthesizer....................................................... 47
Phone fails after power on....................................................................................... 48
Measurement points at the VCXO.......................................................................... 48
Measurement points at the PLL/VCO..................................................................... 49
Issue 1 Page 3
RH-18/38 Manual Alignment using Phoenix............................................................... 50
RX calibration ............................................................................................................50
GSM1800 RX calibration ..........................................................................................51
RX channel select filter .............................................................................................52
RX Band Filter Response ..........................................................................................53
Tx Power tuning ........................................................................................................54
TX power tuning GSM............................................................................................ 54
TX power tuning PCN............................................................................................. 57
I/Q tuning ...................................................................................................................59
RF control ..................................................................................................................61
Call testing .................................................................................................................62
Issue 1 Page 4
Company confidential RH-18/36/38
CCS Technical Documentation
Baseband troubleshooting
Baseband test points
This document contains the Nokia 1100 troubleshooting diagrams.
Test points are described and listed in the A3 schematic diagrams.
Troubleshooting diagrams
In this section, Troubleshooting diagrams is provided for the most common problems of
the Nokia 1100
NOTE : Since both D200 (UEM) and D400(UPP) are underfilled, they can not be replaced.
If either D200 or D400 is defective, the whole PWB has be discarded.
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Phone is dead
This means that the phone do not draw any current at all when supply is connected and/
or powerkey is pressed.
It is assumed that the voltage supplied is 3.6 VDC. The UEM will prevent any functionality what so ever at battery/supply levels below 2.9 VDC.
Phone is dead
Yes
CCS Technical Documentation
X105
VBAT = 3,6VDC
Yes
L260,L261,L262,L263,L264,L265
C260,C261,C262,C263,C264,C265
Voltage = 3,6VDC
Yes
J404
Sleep-clock is
32.768 kHz, 1,8Vpp
Yes
J402
PURX = 1,8VDC,
1 sec. after power-key
is pressed
Yes
C227
VR3 = 2,78VDC
No
No
No
No
No
Check :
X105
Check :
L260,L261,L262,L263,L264,L265
C260,C261,C262,C263,C264,C265
Check :
B200, C209, C210, PW B. Else
defective D200*
Check :
PWB.
Else defective D200*
Check :
C227, PWB.
Else defective D200*
Yes
26 MHz clock min. 300mVACpp,
R426
probe Cin=10-13 pF/10M
Yes
No
Check :
C227, PWB.
Else defective D200*
Check :
D450 (Flash).
Else defective D200*
Figure 1: Phone is dead troubleshooting
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CCS Technical Documentation
Flash programming do not work
The flash programming can only be done via the pads on the PWB (J396).
In case of Flash failure in FLALI station, problem is most likely related to SMD problems.
Possible failures could be short-circuit of balls under µBGAs (UEM, UPP, FLASH). Missing
or misaligned components.
In flash programming error cases the flash prommer can give some information about a
fault.
The fault information messages could be:
- Phone doesn't set FBUS_TX line low
Because of the use of uBGA components it is not possible to verify if there is a short cir-
cuit in control- and address lines of MCU (UPP) and memory (flash).
Flash prgramming
do not work
Error fro m prom mer:
"Phone doesn't set
FBUS_T X line low"
Yes
J396, R108
Check connection between
pad 1,2 & 3 on J396
and R108
Yes
J409, J410, J411, J412
Voltage level at 1,8VDC
Yes
Try re a d in g MCU ID
with Phoenix.
Reading OK?
Yes
Try reading Flash ID
with Phoenix.
Reading OK?
No
No
No
No
Check :
R108, PW B
Check :
PWB.
Else defective D200*
Check :
PWB.
Else defictive D4 00*
Check :
Replace D450
Yes
Reflash phone
Figure 2: Flash programming fault
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Power does not stay on or phone is jammed
If this kind of failure is presenting itself immediately after FLALI, it is most likely caused
by ASICs missing contact with PWB.
If for some reason the MCU does not service the watchdog register within the UEM, the
operations watchdog will run out after approximately 32 seconds. Unfortunately, the
service routine can not be measured.
Power doesn't stay on,
or phone is jammed
CCS Technical Documentation
J404
Sleep clock = 32.768 kHz,
1.8Vpp
Yes
J402
PURX = 1,8VDC,
1 sec. after power-key is
pressed
Yes
UI functionality,
and keys react
to pressure?
Yes
R426
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M
No
No
No
No
Check :
B200, C209, C210, PW B.
Else defective D200*
Check :
PWB.
Else defictive D200*
Check :
D450, Keymat,
Lightguide, PWB .
Else defective D400*
Check :
C420, C426, R420,
R426, N600(Mjoelner)
Yes
Reflash phone
Figure 3: Phone jammed troubleshooting
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Company confidential RH-18/36/38
CCS Technical Documentation
Display information : "Contact Service"
This error can only happen at power up where several self-tests is run. If any of these test
cases fails the display will show the message: "Contact Service".
It's individual test cases so the below lineup of error hunting's has no chronological
order. Use common sense and experience to decide which test case to start error hunting
at.
Display shows
"Contact Service"
Yes
EarDa & MicDa
between
UPP and UEM?
MBUS interface
between
UPP and UEM?
AuxDa & UEMInt
between
UPP and UEM?
SleepX & SleepClk
between UPP & UEM?
TXI/QD & RXI/QD?
SIM interface between
UPP & UEM
No
Check :
PWB.
Else defecti v e D20 0*
or D400*
Key is stucked
Flash checksum
! ASIC version vs. compilation flag, PMM checksum
! PMM validity
! Warrenty Information State
! SIM-Lock
Check :
A-cover, Keymat, Lightguide,
PWB.
Reflash phone
Check :
PWB.
Else defective D450 (FLASH)
Figure 4: Troubleshooting when Contact Service message seen
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CCS Technical Documentation
The phone do not register to the network, or the phone cannot make a call
If the phone doesn't register to the network, the fault can be in either BB or RF. Only few
signals can be tested since several signals is 'burried' in one or more of the inner layers of
the PWB.
First of all check that SIM LOCK is not causing the error by using a Test-SIM card and
connect the phone to a tester.
Phone do not register to
network
or phone cannot make a ca ll
C222, C223, C224, C225,
C226, C227
Voltage = ~2,78VDC
All during GSM frame-
call mode.
Use TXP on C646 as trigger
Yes
C230, C231
Voltage = ~1,35VDC
All during GSM frame (call mode)
Use TXP on C646 as trigger
Yes
J421, J422, J423
Check RF serial bus during
GSM-frame :
Logic HIGH = 1,8VDC
Logic LOW = 0V DC
RFBUSC LK (J421),
RFBUSD A (J422),
RFBUSEN1X (J423)
Yes
R601, R603
Check analog signals during
GSM-frame (RX slot):
RXIP/N (R601) = 0-1,45VDC
RXQP/N (R603) = 0-1,45VDC
Check :
No
C222,C223, C224, C225,
C226, C 227 , P WB .
Else defective D200 or D400*
Check :
No
C230, C 231 , P WB .
Else defective
D200* or D400*
Check :
No
Else defective D200*
Check :
No
Else defective D200*
PWB.
or D400*
PWB.
or D400*
Yes
R610, R611
Check analog signals during
GSM-frame (TX slot):
TXIP/N (R610) = 1-1,75VDC
TXQP/N (R611) = 1-1,75VDC
Yes
No
Check :
R610, R 611 ,P WB .
Else defective D200*
or D400*
Check RF
Figure 5: No call troubleshooting
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CCS Technical Documentation
SIM related faults
Insert SIM card fault
The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) can be
tested without a SIM card. When the power is switched on the phone first check for a
1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereafter it
will display ”Insert SIM card”.
Display shows :
"Insert SIM Card"
Yes
Verify that phone checks for
1,8V-SIM, and then 3V-SIM
Check for SIM voltage during power-up
Ch1 : VSIM
Ch2 : RESET
X387
during power-up.
(See illustration below)
Yes
SIM Interface OK
Figure 6: SIM troubleshooting
No
Ch3 : CLOCK
Ch4 : DATA
Check :
X387, R386, PWB.
Else defective D200*
Figure 7: Signal diagram
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SIM-Card rejected
The error ”SIM card rejected” means that the ATR message received from SIM card is corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent from
card to phone.
For reference a picture with normal SIM power-up is shown below.
Normal SIM power-up sequence
CCS Technical Documentation
Ch1 : VSIM
Ch2 : RESET
Ch3 : CLOCK
Ch4 : DATA
Figure 8: Signal diagram
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CCS Technical Documentation
Audio related faults 1: Earpiece and microphone
Earpiece do not work
Replace :
Earpiece
Error still present
Z150, R161
Check Z150, R161 is
working correctly
(no short/open-circuit)
Yes
Defective D200*
Microphone do not work and
the isn't any mechanical
problem
Z100
Check Z100 is
working correctly
(no short/open-circuit)
Replace :
System Connoctor
No
No
Check :
R386, PWB.
Else defective D200*
Replace :
Z100
Error still present
R165
Check voltage level on
R165 towards UEM (bias)
= 2,1V
Yes
R153
Check voltage level on
R153 towards mic-lines (bias)
= 1,0V - 1,4V
No
No
Check :
R165, C168, PWB.
Else defctive D200*
Check :
R153, R157,C151, C152,
C153, C154, PWB.
Figure 9: Top: Earpiece troubleshooting, bottom: Microphone troubleshooting
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Audio related faults 2: Headset
Headset earpiece do not
work and the isn't any
mechanical problem
CCS Technical Documentation
R183, Z102
Check R183, Z102 is
working correctly
(no open-circuit)
Defective D200*
Headset microphone do not
work and the isn't any
mechanical problem
R166
Check voltage level on R166
towards UEM (bias) = 2,1V
Yes
R151
Check voltage level on R151
towards UEM (bias)
= 1,0V - 1,4V
Yes
No
No
No
Replace :
C183 and/or Z102
Replace :
C183 and/or Z102
Check :
R166, R151, C171
R152, R165, R168,
C172, C170, C173,
C174, Z101
Check XMIC line to UEM
(D200)
Error still present
No
Replace :
Defective component
Defective D200*
Figure 10: Headset troubleshooting
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CCS Technical Documentation
Charging failure troubleshooting
Phone is OFF - battery is
completely empty
(<=3,1VDC)
and no current from
charger when connected
L100
VCHAR > 2,1VDC
Yes
Defective D200*
No
Check :
F100, L100, V100, C100,
R200, System-c onnector.
Phone is ON or OFF - battery
nominal voltage (~3,6VDC)
and no current from
charger when connected
L100
VCHAR > 3,6VDC
No
Check :
F100, L100, V100, C100,
R200, System-c onnector.
Yes
Defective
D200 or D400*
Figure 11: Charging troubleshooting 1
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Charging troubleshooting 2
Display info when
charger is connected :
"Not charging"
CCS Technical Documentation
Voltage on R206 towards
R206
D200 is ~0,8VDC
when power is connected.
(BSI must be 75K)
Yes
R207
Voltage (use scope) on R207
towards D200 is ~0,9VDC at
peak.
(BSI must be 47K)
Yes
R200
Voltage on R200 towards
D200 same as VBAT voltage
Yes
R200
Voltage rises slowly on
R200 towards D200 when
charger is connected.
Yes
No
No
No
No
Check :
X105, R202, R206, C240.
Check :
X105, R202, R207, C220.
Check :
R200, PWB.
Else defective D200*v
Check :
PWB.
Else defective D200*
Check :
PWB
Figure 12: Charging troubleshooting 2
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CCS Technical Documentation
General RF Troubleshooting
Two types of measurements are used in the following. It will be specified if the measurement type is "RF" or "LF".
• RF measurements are done with a Spectrum Analyser and a high-frequency 500
ohm passive probe, for example HP54006A. (Note that when measuring with the
500 ohm probe the signal will be around 20 dB attenuated. The values in the following will have these 20 dB subtracted and represent the real value seen on the
spectrum analyser).
Note that the testjig have some losses which must be taken into consideration when calibrating the
test system.
• LF (Low frequency) and DC measurements should be done with a 10:1 probe and
an oscilloscope. The probe used in the following is 10MW/8pF passive probe. If
using another probe then bear in mind that the voltages displayed may be
slightly different.
Always make sure the measurement set-up is calibrated when measuring RF parameters
on the antenna pad. Remember to include the loss in the module repair jig when
realigning the phone.
Most RF semiconductors are static discharge sensitive. So ESD protection must be applied during repair (ground straps and ESD soldering irons). Mjoelner and Bifrost is moisture sensitive so parts must be pre-baked prior to soldering.
Apart from key-components described in this document there are a lot of discrete components (resistors, inductors and capacitors) for which troubleshooting is done by checking if soldering of the component is done properly and checking if the component is
missing from PWB. Capacitors can be checked for short-circuiting and resistors for value
by means of an ohmmeter, but be aware in-circuit measurements should be evaluated
carefully.
In the following both the name EGSM and GSM850 will be used for the lower band and
both PCN and GSM1900 will be used for the upper band.
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RF Key component placement
CCS Technical Documentation
Figure 13: RF key components
Table 1: RF component placement
N600 Mjoelner RF IC
Z601 PCN RX SAW
Z602 EGSM RX SAW
Z603 EGSM TX SAW
B600 26 MHz crystal
G600 VCO ( 4.0 GHz UHF VCO )
N700 Power Amplifier (PA)
Z700 RX/TX switch
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CCS Technical Documentation
Refer to the picture below for measuring points at the UEM (D200).
Figure 14: Supply points at UEM (D200)
Figure 15: Supply point at Mjoelner (N600)
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CCS Technical Documentation
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CCS Technical Documentation
RH-36 Receiver troubleshooting
General Instructions for GSM850 RX Troubleshooting
Connect the phone to a PC with the module repair jig.
Start Phoenix and establish connection to the phone
Phoenix commands
RF Controls .Band GSM 850 RX .Continuous mode
Channel 190 .AGC 8 FEG ON + 46 dB
The setup should now look like this:
Figure 16: GSM850 RF controls window
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Troubleshooting diagram for GSM850 Receiver
Figure 17: GSM850 Receiver troubleshootingt
Apply -55dBm
942.4 MHz
offset 67.71kHz
from generator
to
antenna conn
YES
CCS Technical Documentation
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
EGSM
chain
OK
Check RX/TX
switch at
RX900
Z700
-56dBm
YES
Spectrum analyzer
EGSM SAW filter
Z602
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L602 and L603
-65DbM
NO NO
NO
Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
NO
YES
Check
RX/TX
switch
Check
SAW filter
Z602
Check
Inductor
L603, L602
Check Mjoelner
YES
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
NO
Check
Baseband
Page 22 Nokia Corporation. Issue 1 10/03
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CCS Technical Documentation
By measuring with an oscilloscope at RXIP or RXQP on a working GSM 850 receiver this
picture should be seen.
Signal amplitude peak-peak 789 mV
DC offset 1.2 V
Figure 18: RX850 I/Q signal waveform
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CCS Technical Documentation
General Instructions for RH-36 GSM1900 RX Troubleshooting
Connect the phone to a PC with the module repair jig.
Start Phoenix and establish connection to the phone
Phoenix commands
RF Controls .Band GSM 1900 RX .Continuous mode
Channel 661 .AGC 8 FEG ON + 46 dB
The setup should now look like this:
Figure 19: GSM1900 RF controls
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CCS Technical Documentation
Troubleshooting diagram for GSM1900Receiver
Figure 20: GSM1900 receiver troubleshooting diagram
Apply -55dBm
1842.8 MHz
offset 67.71kHz
from generator
to
antenna conn
YES
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
EGSM
chain
OK
Check RX/TX
switch at
RX1800
Z700
-56dBm
YES
Spectrum analyzer
PCN SAW filter
Z602
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L601 and L611
-65DbM
NO NO
NO
Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
NO
YES
Check
RX/TX
switch
Check
SAW filter
Z601
Check
Inductor
L601, L611
Check Mjoelner
YES
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
NO
Check
Baseband
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RH-36 Company confidential
By measuring with an oscilloscope at RXIP or RXQP on a working GSM 1900 receiver this
picture should be seen.
Signal amplitude peak-peak 460 mV
DC offset 1.2 V
Figure 21: RX1900 I/Q signal waveform
CCS Technical Documentation
Page 26 Nokia Corporation. Issue 1 10/03
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CCS Technical Documentation
Measurement points in the receiver
Figure 22: RX measurements point at the RX/TX Switch - Z700
Figure 23: Measurements points at the RX-Filters – Z601/Z602
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Figure 24: RX I/Q Signals, Baseband shielding can UEM (D200)
CCS Technical Documentation
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CCS Technical Documentation
RH-36 Transmitter troubleshooting
Measurement points for the transmitter
Figure 25: Figure 15: TX measuremnet points in the PA ( N700 ) shielding can
Figure 26: TX measurement point in Mjolner (N600) shielding can
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CCS Technical Documentation
General instructions for RH-36 GSM TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator,
otherwise the PA may be damaged.
Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS.
Select File and Product: Gemini
Select: Maintenance, Testing and RF Controls
Band: GSM 850
Active Unit: TX
Tx Power Level: 5
Tx Data Type: Random
Your screen should look like:
Figure 27: GSM850 RF controls window
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CCS Technical Documentation
GSM850 TX output power
Measure the output power of the phone; it should be around 32.5 dBm.
Remember the loss in the jig; around 0.3 dB.
Figure 28: VPCTRL_G & TXC
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CCS Technical Documentation
General instructions for RH-36 GSM1900 TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator,
otherwise the PA may be damaged.
Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS.
Phoenix commands
RF Controls .Band GSM 1900 RX .Continuous mode
Channel 661
Your screen should look like:
Figure 29: GSM1900 RF controls screen shot
GSM1900 TX output power
Measure the output power of the phone.
It should be around 28.5 dBm.
Remember the loss in the jig; around 0.7 dB.
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CCS Technical Documentation
Troubleshooting diagram for GSM1900 TX
Figure 30: GSM1900 TX troubleshooting
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CCS Technical Documentation
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CCS Technical Documentation
General Instructions for RH-18/38 GSM900 RX Troubleshooting
Connect the phone to a PC with the module repair jig.
Start Phoenix and establish connection to the phone
Phoenix commands
RF Controls .Band GSM 900 RX .Continuous mode
Channel 190 .AGC 8 FEG ON + 46 dB
The setup should now look like this:
Figure 31: GSM900 RF Controls window
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Troubleshooting Chart for GSM900 Receiver
Figure 32: EGSM Receiver Troubleshooting chart
Apply -55dBm
942.4 MHz
offset 67.71kHz
from generator
to
antenna conn
YES
CCS Technical Documentation
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
EGSM
chain
OK
Check RX/TX
switch at
RX900
Z700
-56dBm
YES
Spectrum analyzer
EGSM SAW filter
Z602
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L602 and L603
-65DbM
NO NO
NO
Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
NO
YES
Check
RX/TX
switch
Check
SAW filter
Z602
Check
Inductor
L603, L602
Check Mjoelner
YES
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
NO
Check
Baseband
Page 36 Nokia Corporation. Issue 1 10/03
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CCS Technical Documentation
By measuring with an oscilloscope at RXIP or RXQP on a working GSM 900 receiver this
picture should be seen.
Signal amplitude peak-peak 789 mV
DC offset 1.2 V
Figure 33: RX900 I/Q signal waveform
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CCS Technical Documentation
General Instructions for GSM1800 RX Troubleshooting
Connect the phone to a PC with the module repair jig.
Start Phoenix and establish connection to the phone
Phoenix commands
RF Controls .Band GSM 1800 RX .Continuous mode
Channel 661 .AGC 8 FEG ON + 46 dB
The setup should now look like this:
Figure 34: GSM1800 RF control window
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Troubleshooting Chart for GSM1800Receiver
Figure 35: GSM1800 receiver Troubleshooting chart
Apply -55dBm
1842.8 MHz
offset 67.71kHz
from generator
to
antenna conn
YES
Oscilloscope
at RX i/Q
signal 588mVpp
DC offset 1.35V
Freq.67.71kHz
YES
EGSM
chain
OK
Check RX/TX
switch at
RX1800
Z700
-56dBm
YES
Spectrum analyzer
EGSM SAW filter
Z601
output
-65dBm
YES
Spectrum analyzer
check signal after
inductors
L601 and L611
-65DbM
NO NO
NO
Oscilloscope
check
VC1 and VC2
at Z700
Signal = 0V
NO
YES
Check
RX/TX
switch
Check
SAW filter
Z602
Check
Inductor
L603, L602
Check Mjoelner
YES
YES
Oscilloscope
VRX 2.7V
Check Mjoelner
serial
interface
NO
Check
Baseband
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XIP or RXQP on a working GSM 1800 receiver this picture should be seen.
Signal amplitude peak-peak 460 mV
DC offset 1.2 V
Figure 36: RX1800 I/Q signal waveform
CCS Technical Documentation
Measurement points in the receiver
Figure 37: RX measurements point at the RX/TX Switch - Z700
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Figure 38: Measurements points at the RX-Filters – Z601/Z602
Figure 39: RX I/Q Signals, Baseband shielding can UEM (D200)
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RH-18/38 Transmitter troubleshooting
Measurement points for the transmitter
Figure 40: TX measuremnet points in the PA ( N700 ) shielding can
CCS Technical Documentation
Figure 41: TX measurement point in Mjolner (N600) shielding can
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General instructions for RH-18/38 GSM TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator,
otherwise the PA may be damaged.
Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS.
Select File and Product: RH-18
Select: Maintenance, Testing and RF Controls
Band: GSM 900
Active Unit: TX
Tx Power Level: 19
Tx Data Type: All 1
Your screen should look like:
Figure 42: GSM900 RF controls window
Measure the output power of the phone; it should be around 32.5 dBm.
Remember the loss in the jig; around 0.3 dB.
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Figure 43: VPCTRL_G and TXC signal
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PCN Transmitter General instructions for PCN TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal act as normal. RFcable should be connected to measurement equipment or to at least a 10-dB attenuator,
otherwise the PA may be damaged.
Start Phoenix-Service-Software and establish a connection to the phone e.g. FBUS.
Phoenix commands
RF Controls .Band GSM 1800 RX .Continuous mode
Channel 37 .AGC 14 FEG ON + 24 dB
Your screen should look like:
Figure 44: RF controls window
Measure the output power of the phone; it should be around 28.5 dBm. Remember the
loss in the jig; around 0.7 dB.
Troubleshooting chart for PCN transmitter: refer to Figure 17, “GSM1900 receiver troubleshooting diagram,” on page 24
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Synthesizer
There is only one PLL synthesizer generating Local Oscillator frequencies for both RX and
TX in both bands ( PCN and EGSM). The VCO frequency is divided by 2 for PCN operation
or by 4 for EGSM operation inside the Mjoelner IC.
26 MHz Reference Oscillator ( VCXO )
The 26 MHz oscillator is located in the Mjoelner IC (N600). The coarse frequency for this
oscillator is set by an external crystal (B600). The reference oscillator is used as a reference frequency for the PLL synthesizer and as the system clock for BaseBand. The
26MHz signal is divided by 2 to achieve 13MHz inside the UPP IC (D400).
The 26 MHz signal from the VCXO can be measured by probing R425 (must be measured
on the UPP side of R425 i.e. the end not connected to C425). The level at this point is
approx. 700mVpp. Frequency of this oscillator is adjusted by changing the AFC-register
inside the Mjoelner IC. This is done via the Mjoelner serial interface.
Example Signal Measured at VCXO output (R425)
CCS Technical Documentation
Figure 45: VCXO 26 MHz waveform
VCO
The VCO is an ASIC with all the frequency determining parts inside.
In order to reduce the requirements of the tuning voltage and coverage of the VCO, the
VCO core is composed of four VCOs in parallel. This VCO circuit enables a very wide tuning range of 3.4 - 4.0 GHz .
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Troubleshooting diagram for PLL Synthesizer
Figure 46: PLL Troubleshooting diagram
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Phone fails after power on
If the phone stops working a short time after the power is turned ON, a possible reason
for this could be that the 26MHz system clock signal is not getting to the UPP clockinput in BaseBand. In this case check the following:
1 Turn on the phone and check
2 VCXO Power supply (C620) = 2.7V
3 VCXO output (R425 – end not connected to C425) is 26MHz and approx. 700mVpp
If this is not the case check the reference crystal (B600) and Mjolner (N600) as well as
R425, R426, C425, C426.
Measurement points at the VCXO
Figure 22: Measurement point for VCXO supply
CCS Technical Documentation
Figure 23: Measurement point for VCXO output
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Measurement points at the PLL/VCO
Figure 47: Measurement point for PLL
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RH-18/38 Manual Alignment using Phoenix
In Phoenix select connection Fbus and Product Gemini. If you power up the board before
selecting Fbus, it works without any error messages.
Use Jig or other device for RF and bus connection. Attenuation in the probe alone is
0.5dB for 900 and 1dB for 1800. Use CMD55 or other suitable device. Default channels
are 37 for GSM900 and 700 for GSM1800. The alignments and calibrations must be performed in the order shown to give reliable results.
The way to save data to the phone and to load data from the phone is made different in
the various tunings. Always look what is shown in the windows regarding these issues
and act accordingly .
To vary a selected parameter you can use + and – key or in some cases directly type the
new value. + and – steps the value for every press. Repeat function seems not to work. In
I/Q you can use the side arrows.
RX calibration
Select Maintenance, Tuning, RX Calibration
Select Band: GSM 900
Select Automatic and follow the promts
The result should be like the shown:
Figure 48: RX calibration window
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GSM1800 RX calibration
1 The existing data in the phone is shown
2 Calibrate, and the new data is shown
3 Stop, and the little window pops up where you can select to save or not
4 Select GSM1800 in the top bar and repeat at channel 700
Figure 49: GSM1800 RX calibration window
1 The existing data in the phone is shown
2 Calibrate, and the new data is shown
3 Stop, and the little window pops up where you can select to save or not
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RX channel select filter
1 Select Maintenance, Tuning, Rx Channel Select Filter Calibration
2 Press Start and you can select to load values from the phone or not
3 Press AutoTune
4 Press Stop and you can select to save values to the phone or not to..
Figure 50: RX channel selection window
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Note: This calibration requires no input signal
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RX Band Filter Response
1 Select Maintenance, Tuning, Rx Band Filter Response Compensation
2 Press Start, Read from PM area and you can select to load values from the phone
or not
3 Press Manual Tuning
4 Set the Signal generator according to the pop-up windows
5 When finished press Stop, Write to PM area and you can select to save values to
the phone or not
6 Repeat for GSM1800
Figure 51: RX Band filter response window
Note: This calibration requires a lot of different frequencies from the generator. If you have a signal
generator with a frequency list option you can with advantage use Auto Tuning (Dwell should be
around 10ms).
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Tx Power tuning
Select Maintenance, Tuning, Tx Power Level Tuning
TX power tuning GSM
1 Select edge off, GSM 900
Figure 52: TX power tuning window1
CCS Technical Documentation
2 Press Start and select from where to load values. It is best to have PC saved data
from a good phone. The data from a "good" phone can be saved to PC for use
later.
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Figure 53: TX power levwel tuning window 2
1 Select the modulation 1, 0 or random in Tx Data Type. Select random if a GSM
tester is used. Then it can synchronise to the burst.
2 Select Tx PA Mode High
3 Tune the highlighted values to the wanted power (Use average burst power)
4 Tune base level to –28dBm (Close to lowest level CMD55 can keep synchronisa-
tion)
5 Calculate coefficients
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Figure 54: TX power level tuning 3
CCS Technical Documentation
1 Select Tx PA Mode low and tune the high lighted values.
2 The base level coefficient is taken from the high mode. Do not change it.
3 Calculate and select Stop
Figure 55: Stop TX power level tuning dialogue
If you are satisfied with the coefficients and the power, then save to the Permanent
memory.
You can also save the table to the PC, so that you can load it to an other phone. Or you
can select not to do anything by removing both ticks.
Only way to end the tuning session is with Yes
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TX power tuning PCN
Figure 56: PCN (GSM1800) TX power tuning window
1 Select GSM 1800 band (PCN)
2Start
3 Select where to get values from. Normally Permanent Memory
4OK
Figure 57: Start TX power level tuning dialogue
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Figure 58: GSM1800 TX power level tuning window
CCS Technical Documentation
1 Select the wanted modulation. Random if a GSM tester is used, so that you can
synchronise the burst.
2 Only high mode is possible
3 Tune the highlighted values to the wanted power
4 Tune base level to –27dBm
5Stop
Figure 59: Stop TX power level tuning dialogue
6 Select where to save the values, one, both or no one can be selected.
7 Yes. That’s the only way to end tuning.
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I/Q tuning
Select Maintenance, Tuning, Tx IQ tuning
Set CMD55 to Narrow Spectrum on the same band as the phone. Selected in the top
menu.
Figure 60: I/Q tuning window
1 Select where to get values. Normally select Load From Product
2Start
3 Tune offset values to lowest carrier. Use Side arrows or +, - .
4 Tune Amplitude and phase to lowest sideband.
5 Check eventually with other modulation (0).
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Figure 61: TX I/O tuning window
CCS Technical Documentation
Note: Remember to tick Save to Product if you want to save the values in the phone.
1. Stop to end the tuning with the selected save option
2. Same procedure for PCN as for GSM.
3. Remember to tick Save To Product.
4. Stop. Ends tuning and does what you have ticked.
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RF control
This menu can be placed in maintenance or in tuning depending on the Phoenix.
It is meant to check the receiver or transmitter without going in call. It works very much
like a call, but you have control via the PC, and not via the tester.
The TX mode GSM900 can select between Free, High and low mode. It changes the PA
mode, but changes also the power level if a level is selected that is not supported in that
mode.
If you want to tune at other channels than the default, then you must select it first in RF
control and then start the tuning.
Figure 62: RF control window
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Call testing
If all tunings are done, and the phone TX and RX is working a call is the ultimate test of
the phone.
Set CMD55, or similar tester, to manual test and switch the phone to normal if it was in
local. Remember to have a test simcard in the phone.
When the phone has made a registration a call can be made, and it is possible to let the
phone answer via Phoenix. In the Autocaller (Maintenance Testing) you can answer by
ticking Answer when button pushed and then posh the button.
CCS Technical Documentation
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