Programmes After Market Services
NHE–8/9 TUNING
INSTRUCTIONS
issue 3 12/98
NHE–8/9
PAMS
Tuning Instructions
Technical Documentation
Contents
Introduction Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Equipment Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup for Tuning a Phone without Removing Covers Page 5. . . . .
Equipment Setup for Tuning a Phone with Covers Removed Page 6. . . . . . . .
Starting The Software Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tuning Steps Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. RSSI Reference Signal Level Storage Page 7. . . . . . . . . . . . . . . . . . . . . . . . .
2. AFC Diagram Storage Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning Page 8. . . . . . . .
4. Tuning of Transmitter Power Levels Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Charge Voltage Adjustment Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Battery Voltage Adjustment Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. LCD Calibration Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Introduction
General
In contrast to earlier second–generation analog cellular phones almost all tuning
operations of the NHE–8/9 are carried out using the service software. The service
software turns the phone into the locals mode, in which the phone can be outwardly
controlled via the M2BUS interface.
Tuning is based on the software communicating with the D/A and A/D converters
of the phone. In some instances the phone processor will also calculate the
required correction parameter.
The tuning values of the phone reside on the EEPROM. The contents of the
EEPROM can be read by the service software and saved as a file. This is advisable
when there is need to retain that information, e.g. in view of replacement of the
circuit. The program also enables writing the default parameters on the EEPROM,
in which case all tuning steps should be carried out.
Tuning Instructions
N.B. During tuning, proceed as follows:
– Take care not to damage sensitive measuring instruments with excessive
RF power.
– Carry out all tuning steps in the shortest possible time to avoid excessive
heating of RF units.
– Perform all tuning steps in the order presented.
– Never try to mask a fault by tuning it out!
Required Equipment
– PC/AT computer with service software; see separate section for instructions
on installation and use.
– M2BUS adapter DAU–4S and other service accessories; see equipment set-
up pictures.
– Multimeter or DVM.
– GSM radio telephone test station or separate measuring equipment as fol-
lows:
– RF generator
issue 3 12/98
– pulse power meter
– spectrum analyzer
– attenuator and branching unit
Page 3
NHE–8/9
PAMS
Tuning Instructions
Caution: Make sure that you have switched off the PC and the printer before
Caution: Do not connect the PKD–1 key to the serial port. You may damage
Attach the protection key PKD–1 to parallel port one (25–pin female D–connector)
of the PC. When connecting the PKD–1 to the parallel port be sure that you insert
the PC end of the PKD–1 to the PC (male side). If you use a printer on parallel port
one, place the PKD–1 between the PC and your printer cable.
Next connect the M2BUS service cable, DAU–4S, to the serial port (RS–232) of the
computer. Attach one end of the service cable to the PC serial port and the other
end to the service box, JBU–4. For servicing the phone with the covers in place the
service box should always be used.
The RF cable should be connected between the RF connector of the test set and
the appropriate connector on JBU–4. When the phone covers are removed the RF
connection on the extension cable should be used instead.
For audio measurements connect the service cable, SCS–4, as follows:
Technical Documentation
making connections !
your PKD–1 !
– EAR line to AF INPUT of test equipment
– MIC line to MOD GEN OUTPUT of test equipment
Page 4
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Tuning Instructions
Equipment Setup for Tuning a Phone without Removing Covers
5.
2.
6.
1.
4.
3.
Service accessory: Product code:
1.Service box, JBU–4 0770041
2.M2BUS adapter cable, DAU–4S 0730057
3.Service cable, SCS–4D 0730116
4.Audio cable, ADS–1 0730011
5.Power connector, PCS–1 0730012
6.Service software diskette 3.5‘‘ 0774067
–Software protections key PKD–1 0750018
issue 3 12/98
Page 5
NHE–8/9
PAMS
Tuning Instructions
Technical Documentation
Equipment Setup for Tuning a Phone with Covers Removed
5.
2.
1.
4.
6
3.
Service accessory: Product code:
1.Service box, JBU–4 0770041
2.M2BUS adapter cable, DAU–4S 0730057
3.Module jig, JBS–18 0770070
4.Audio cable, ADS–1 0730011
5.Power connector, PCS–1 0730012
6.Service software diskette 3.5‘‘ 0774067
–Software protection key PKD–1 0750018
Page 6
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Starting The Software
The software is delivered on a diskette and is copy protected with a dongle. The
software must be installed on the hard disk, see installation instructions in Service
Software User’s Guide.
Starting steps:
– Start Windows
– Open NMP Service Software Group
– Start software by double–clicking the Service Software icon
– When Login windows appears press OK button
– Choose from main menu
Product –> New.
Tuning Steps
1. RSSI Reference Signal Level Storage
Tuning Instructions
Reference value for the received signal strength meter are program tuned.
RSSI reference signal level programming:
– Select
– Connect RF generator to antenna connector at 947.067710 MHz.
– Adjust signal generator level to –80 dBm + cable attenuation.
– Press
– Adjust signal generator level to –55 dBm + cable attenuation.
– Press
– Difference values should be between ± 5.0 dB.
– Press
Tuning –> RSSI (AGC)...
OK
button
OK
button.
OK
button.
2. AFC Diagram Storage
This tuning is used to calibrate the automatic frequency control range.
AFC tuning:
– Select
Tuning –> AFC...
.
– Set RF generator frequency 947.067710 MHz at level –55 dBm + RF cable
– Check that ”Cont. mode channel” is 60
– The measurement result should be;
issue 3 12/98
attenuation.
Page 7
NHE–8/9
PAMS
Tuning Instructions
Technical Documentation
• Low > –20 kHz
• Middle ±3.0 kHz (depends on generator frequency accuracy)
• High < 20 kHz
OK
– Press
button.
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning
The purpose of this tuning operation is to adjust the I/Q modulator d.c. offsets and
the I/Q modulator amplitude balance and phase shift.
I/Q modulator d.c. offsets, amplitude balance and phase shift tuning:
– Select
– Select I/Q tuning values from PC’s memory, phone’s EEPROM or factory de-
fault values.
– Connect spectrum analyzer (with attenuator if needed) to phone antenna
connector.
– Check that TX power level is level 10, channel is 60 and TX data type is 1.
Tuning –> TX I/Q...
– Adjust spectrum analyzer centre frequency to 902 MHz, Span 200 kHz,
Res BW 10 kHz, Video BW 1 kHz and Sweep time 0.5 s.
–67.71 kHz +67.71 kHz
D.C. offset
tunings:
Set this value
to minimum
CHF
> 30 dB
> 35 dB
Amplitude &
phase difference:
Set this value
to minimum
– Select option ”TX I d.c. offset”.
Page 8
– Adjust the level of centre frequency (CHF signal) to minimum by varying D/A
converter value with
<–
and –> buttons.
– Amplitude difference between CHF–67.7 kHz and CHF should be >30 dB.
– Select option ”TX Q d.c. offset”.
– Adjust the level of signal CHF to minimum by varying D/A converter value
with
<–
and
–>
keys.
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
– Select option ”Tune Amplitude Difference”.
– Adjust the level of signal CHF+67.7 kHz (902.06777 MHz) to minimum by
varying D/A converter value with <– and –> keys.
– The amplitude difference between CHF+67.7 kHz and CHF–67 kHz should
be >35 dB.
– Select option ”Tune Phase Difference”.
– Adjust the level of signal CHF+67.7 kHz to minimum by varying D/A convert-
er value with <– and –> keys.
– When values are correct press
OK
4. Tuning of Transmitter Power Levels
This adjustment loads the power levels of the phone transmitter into the EEPROM.
When doing this, a pulse power meter or spectrum analyzer must be used.
Power levels programming:
– Select
Tuning –> TX Power...
Tuning Instructions
button.
– Select I/Q tuning values from PC’s memory, phone’s EEPROM or factory de-
fault values.
– Set power supply voltage to 6 V.
– Connect pulse power meter or spectrum analyzer to antenna connector.
– Check that channel is 60.
– Adjust the power level (levels 5, 13 and 15) with + and – buttons and
change levels with ↑
Power
level
5 33
13 17.0
15 13
– Press
– Once all TX levels are correct, press
Calculate
Tuning P
(VB=7.2 V, CH60)
and ↓ keys.
/dBm
OUT
button to calculate all other levels.
OK
button.
5. Charge Voltage Adjustment
A reference value for charge voltage is set by using an accurate 6.0 V supply.
Calibration of the charge voltage:
– Select
issue 3 12/98
Tuning –> Charger A/D...
Page 9
NHE–8/9
PAMS
Tuning Instructions
– In case the phone covers are not removed replace the standard battery of
the phone with the service battery.
– Apply +6 V to VCHARG line.
– Software reads 6 V, A/D reading fed to phone VCHARG line.
– Store charge voltage value to phone EEPROM by pressing OK button.
6. Battery Voltage Adjustment
A reference value for battery are calibrated by using an accurate 6 V supply.
Calibration of the A/D converter channels:
– Select
– Replace the standard battery of the phone with the dummy battery.
– Apply +6 V to service battery.
– Software reads 6 V, A/D reading fed to phone VBAT line.
– Store correct value to phone EEPROM by pressing
Tuning –> Battery A/D...
Technical Documentation
OK
button.
– Apply +8.4 V to service battery.
– Software reads 8.4 V, A/D reading fed to phone VBAT line.
– Store correct value to phone EEPROM by pressing
7. LCD Calibration
This adjustment is used to calibrate the contrast of the display , and should only be
performed if necessary.
Tuning of the LDC display:
– Select
– Enter the actual environment temperature and press OK button.
(The LCD must be calibrated at a temperature of 25 ±1 degrees centigrade).
– Select
– Adjust the value between 2 and 19 for the best contrast. The default value is
”11”, as shown on the service software.
– At the lowest value, there may be nothing visible on the display, while at the
highest value, the main display area will be completely black.
Tuning –> LCD A/D...
Tuning –> Display...
OK
button.
Page 10
– At the point at which the value is correct, the display should show a black
section on the left of the main display area, and nothing in the section on the
right of the main display area. No icons should be visible when the display is
correctly calibrated.
– Once the right value is selected, press OK button.
issue 3 12/98
Loading...