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CCS Technical Documentation
NPM-6/6X Series Transceivers
Troubleshooting Instructions
Issue 2 06/03 Copyright Nokia. All rights reserved.
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Page 2 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
Table of Contents
Page No
RF Troubleshooting ....................................................................................................... 4
Introduction to RF troubleshooting .............................................................................4
RF Key component placement .....................................................................................5
RF Measurement points ...............................................................................................6
EGSM900 & GSM1800 Transmitter ............................................................................. 7
General instructions for Tx troubleshooting ............................................................. 7
Transmitter troubleshooting diagram ........................................................................ 9
Pictures of transmitter signals ................................................................................. 12
EGSM900, GSM1800 and GSM1900 Receiver .......................................................... 14
General instructions for Rx troubleshooting ........................................................... 14
Troubleshooting diagram for EGSM900 receiver................................................... 18
Troubleshooting diagram for GSM1800 receiver ................................................... 19
Troubleshooting diagram for GSM1900 receiver ................................................... 20
Synthesizer ................................................................................................................... 21
General instructions for synthesizer troubleshooting.............................................. 21
Synthesizer troubleshooting diagram ...................................................................... 22
Pictures of synthesizer signals................................................................................. 23
Baseband Troubleshooting........................................................................................... 25
BB Measurement points ............................................................................................25
Troubleshooting diagrams .........................................................................................27
FM Radio troubleshooting ........................................................................................... 48
FM Radio component layout .....................................................................................48
FM Radio troubleshooting diagram ...........................................................................50
Notes to "FM Radio troubleshooting diagram"....................................................... 50
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 3
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
RF Troubleshooting
Introduction to RF troubleshooting
Measurements should be done using Spectrum analyzer with high-frequency high-
impedance passive probe (LO-/reference frequencies and RF power levels) and Oscillo-
scope with a 10:1 probe (DC-voltages and low frequency signals)
The RF-section is built around one RF-ASIC (HELGA N500). For easier troubleshooting,
this RF troubleshooting document is divided in to sections.
Before changing HELGA, please check following things: Supply voltages are OK and serial
communication is coming from baseband to HELGA.
Please note that the grounding of the PA module is directly below PA-module so it is dif-
ficult to check or change. Most RF semiconductors are static discharge sensitive! So
ESD protection must be taken care of during repair (ground straps and ESD soldering
irons). HELGA and PA are moisture sensitive so parts must be pre-baked prior to solder-
ing.
Apart from key components described in this document here are a lot of discrete compo-
nents (resistors, inductors and capacitors) which troubleshooting is done by checking if
soldering of the component is done properly (for factory repairs checking if it is missing
from PWB). Capacitor can be checked for shortening and resistors for value by means of
an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.
Please be aware that all measured voltages or RF levels in this document are rough fig-
ures. Especially RF levels varies due to different measuring equipment or different
grounding of the used probe. When using RF probe usually a good way is to use metallic
tweezers to connect probe ground to PWB ground as close to measurement point as pos-
sible.
Page 4 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
RF Key component placement
Figure 1: Component placement 1
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 5
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
RF Measurement points
Figure 2: Component placement 2
Page 6 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
EGSM900 & GSM1800 Transmitter
General instructions for Tx troubleshooting
Kindly refer to the Service Software Section, Service Concept dagram (p.40)
Connect test jig to computer with DAU-9S cable or to FPS-8 Flash Prommer with XCS-4
modular cable.
Make sure that you have PKD-1 dongle connected to computers parallel port.
Connect DC power supply to module test jig with FLC-2 cable.
Attention: When repairing or tuning transmitter use external DC supply with at
least 3A current capability. Set the DC supply voltage to 3.9V and set the jumper con-
nector on test jig to "bypass" position.
Connect a RF-cable to the module test jig (MJS-49) RF connector to and to measurement
equipment or at least 10dB attenuator, otherfwise the PA may be damaged. Normally
Spectrum analyzer is used as measurement equipment.
Attention: Normally Spectrum analyzer maximum input power is +30dBm. It is recom-
mended to use 10dB attenuator on Spectrum analyzer input to prevent damage.
Set the phone module to test jig and start Phoenix service sofware
Initialize connection to phone. (use FBUS driver when using DAU9S and COMBOX driver
when using FPS-8)
Select product from the menu
File -> Choose product -> NPM-6
From toolbar set operating mode to "Local"
Activate RF controls window from the menu
Maintenance -> Testing -> RF Controls
From the RF controls window
- Select band "EGSM900" or "GSM 1800" or "GSM1900" (Default = "EGSM900")
- Set Active unit to "Tx" (Default = "Rx")
- Set Operation mode to "Burst" (Default = "Burst")
- Set Tx data type to "Random" (Default = "All1")
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 7
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
- Set Rx/Tx channel to 37 on EGSM900 band or 700 on GSM1800 band or 661 on
EGSM1900 (Defaults)
- Set Tx PA mode to "Free" (Default)
- Set power level to 5 (Default = 19) on EGSM900 or to 0 (Default = 15) on GSM1800 or
GSM1900
Page 8 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
Transmitter troubleshooting diagram
Figure 3: Transmitter troubleshooting
TX troubleshooting TX OK
Yes
Check output signal level: Check
(EGSM900
+32...+33dBm @897.4 MHz (GSM900) Yes No Tune
all power TX power
+29...+30dBm @1747.8 MHz levels,
(GSM1800 & GSM1900) levels,
OK ? OK ?
OK ?
No Check output signal
TX signal found ? Yes
on 500 MHZ span Synthesizer
Signal found on troubleshooting
incorrect frequency ?
Yes No
Check with RF probe No
signal level on HELGA
PA input >=0dBm (* troubleshooting
OK ?
*(When 1kOhm passive probe is used,
Yes correct the measurement result by +26dB
start TX power level
tuning and check
tuned RAC values: Yes
Highest level~700...900
Lowest level ~190...210 Tune Tx DAC values
Base levle ~160...190
Major differences ?
No
Yes
Check with oscilloscope: Check control loop
PA ctrl voltage Replace HELGA
dead
components
>1.5V peak OK ? OK ?
No
Yes
Yes
PA & ant switch Replace
troubleshooting faulty
component(s)
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 9
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
Figure 4: HELGA IC troubleshooting
HELGA
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals No
-VR1, VR2, VR4, VR5, VR6 = 2.8V Baseband
-VrefRF01 = 1.35 V troubleshooting
-HELGA serial interface
-TXP & TXC signals
OK ?
Check with RFRF probe:
Check with probe:
-4GVCO outout signal
-4G VCO signal No Synthesizer
-3589.6MHz (EGSM900)
- 3589.6 MHz (GSM900) troubleshooting
-3495.6 MHz (GSM1800)
-3495.6 MHz (GSM1800)
- 3760 MHz (GSM1900)
-3760 MHz (GSM1900)
Level >-10dBm (*
Level >-10dBm
OK ? *(When 1kOhm passive probe is used,
correct the measurement result by +26dB
Check modulator Yes
output components
Replace HELGA
dead
OK ?
Replace
faulty
component(s)
Page 10 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
Figure 5: PA and Antenna Switch troubleshooting
PA & ant switch
troubleshooting
*(When 1kOhm passive probe is used,
correct the measurement by +26dB
Yes
Check with RF probe Yes Check with
signal level on oscilloscope: Replace
PA input >=0dBm (* -VANT_1 (GSM900)
-VANT_1 (EGSM900) ant. switch
OK ? -VANT_2 (GSM1800)
-VANT_2 (GSM1800)
-VANT_3 (GSM1900)
-VANT_3 (GSM1900)
Yes OK ?
Check with No
oscilloscope:
-VBATT ~4V
- VTXB = 2.8 V pulsed Check
- VTxLO_GSM = 0V (GSM900)
(EGSM900) VANT lline components
OK ? OK ?
Yes
No Yes
No
Replace
PA
Replace
faulty
component(s)
Check components
around PA Yes
Replace
OK ? HELGA
No
Replace
faulty
component(s)
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 11
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
Pictures of transmitter signals
Figure 6: Transmitter signals
TXI
VPC
200mV/div 100us/div 200mV/div 100us/div
1
VPCTRL _900 power level high at R703/C703 TX I/Q at R516/517 power level high Random data
VPCTRL_1800/1900 power level high at R704/C704_
1
500mV/div 100us/div
500mV/div 100us/div
VANT_1 / EGSM900 TX at C804 VANT_1,VANT_2,VANT_3
VANT_2 / GSM1800 TX at C835
VANT_3 / GSM1900 TX at C805 OV
( no signal/ Flatline on Oscilloscope screen)
500mV/div MTB 100us/div
500mV/div 100us/div
VTXB_900 at C713
VTXB_1800_1900 at C714 TXP at J504
Page 12 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
Figure 7: TX OUT signal
G S MP O W T u e Se p 2 5 1 3 : 4 8 : 5 9 2 0 0 1
REF 4 1 . 0 d Bm ATT 4 0 d B A_ wr i t e b l a n k
B_
1 0 d B/
REF OF S
11. 0 dB
RBW
1 0 0 k Hz
VBW
1 0 0 k Hz
S WP
2 . 0 s
CENT ER 8 9 7 . 4 0 0 MH z SPAN 2 . 0 0 0 MH z
Tx out signal, 900 band, burst mode, channel 37
Issue 2 06/03 Copyright Nokia. All rights reserved.. Page 13
NPM-6/6X Company confidential
Troubleshooting Instructions CCS Technical Documentation
EGSM900, GSM1800 and GSM1900 Receiver
General instructions for Rx troubleshooting
Connect test jig to computer with DAU-9S cable or to FPS-8 Flash Prommer with XCS-4
modular cable.
Make sure that you have PKD-1 dongle connected to computers parallel port.
Connect DC power supply to module test jig with FLC-2 cable.
Set the DC supply voltage to 6V (test jig has internal voltage regulator of output volt-
age 4V).
Connect an RF-cable to the module test jig (MJS-49) RF connector and to RF signal gen-
erator.
Set the phone module to test jig and start Phoenix service sofware.
Initialize connection to phone. (use FBUS driver when using DAU9S and COMBOX driver
when using FPS-8)
Choose product from the menu
File -> Choose product -> NPM-6
From toolbar set operating mode to "Local"
Activate RF controls window from the menu
Maintenance -> Testing -> RF Controls
From the RF controls window:
- Select band "EGSM900", "GSM 1800" or "GSM1900" (Default = "EGSM900")
- Set Active unit to "Rx" (Default = "Rx")
- Set Operation mode to "Burst" (Default = "Burst")
For continuous mode:
- Set Operation mode to "Continuous"
- Set AGC to "12: FEG_ON + DTOS_ON + BB_30=Vgain60" (maximum gain setting used
in normal mode)
(Default = "14: FEG_ON + DTOS_ON + BB_42=Vgain72")
Page 14 Copyright Nokia. All rights reserved. Issue 2 06/03
Company confidential NPM-6/6X
CCS Technical Documentation Troubleshooting Instructions
- Set Rx/Tx channel to 37 on EGSM900 band, 700 on GSM1800 band or 661 on
GSM1900 (Defaults)
Apply 942.46771 MHz (channel 37 + 67.710 kHz offset), 1842.86771 MHz (channel 700
+ 67.710 kHz offset) or 1960.06771 MHz (channel 661 + 67.71 kHz) ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo