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After Sales Technical Documentation
NHE5 TUNING INSTRUCTIONS
Original, 46/95
NMP PArt No. 0275077
NHE5 Tuning Instructions
After Sales Technical Documentation
AMENDMENT RECORD SHEET
Amendment Number Date Inserted By Comments
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After Sales Technical Documentation
NHE5 Tuning Instructions
TUNING INSTRUCTIONS Contents
Introduction General Required Equipment Equipment Setup Equipment Setup For Tuning A Phone Without Remowing Covers Equipment Setup For Tuning A Phone With Remowing Covers Starting The Software Tuning Steps 1. RSSI Reference Signal Level Storage 2. AFC Diagram Storage 3. I/Q Modulator Amplitude Balance and Phase Shift Tuning 4. Tuning of Transmitter Power Levels 5. Charge Voltage Adjustment 6. Battery Voltage Adjustment Page 4 Page 4 Page 5 Page 5 Page 6 Page 7 Page 8 Page 9 Page 9 Page 9 Page 10 Page 12 Page 13 Page 13
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NHE5 Tuning Instructions
After Sales Technical Documentation
Introduction
General
In contrast to earlier secondgeneration analog cellular phones almost all tuning operations of the NHE5 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. 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!
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After Sales Technical Documentation
NHE5 Tuning Instructions
Required Equipment
PC/AT computer with service software; see Sect. 5 for intructions on installation and use. M2BUS adapter DAU4S and other service accessories; see equipment setup pictures. Multimeter or DVM. GSM radio telephone test station or separate measuring equipment as follows: RF generator pulse power meter spectrum analyzer attenuator and branching unit
Equipment Setup
Caution: Make sure that you have switched off the PC and the printer before making connections ! Caution: Do not connect the PKD1 key to the serial port. You may damage your PKD1 !
Attach the protection key PKD1 to parallel port one (25pin female Dconnector) of the PC. When connecting the PKD1 to the parallel port be sure that you insert the PC end of the PKD1 to the PC (male side). If you use a printer on parallel port one, place the PKD1 between the PC and your printer cable. Next connect the M2BUS service cable, DAU4S, to the serial port (RS232) of the computer. Attach one end of the service cable to the PC serial port and the other end to the service box, JBU4. 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 JBU4. When the phone covers are removed the RF connection on the extension cable should be used instead. For audio measurements connect the service cable, SCS4, as follows: EAR line to AF INPUT of test equipment MIC line to MOD GEN OUTPUT of test equipment
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NHE5 Tuning Instructions
After Sales Technical Documentation
Equipment Setup For Tuning A Phone Without Remowing Covers
6.
2. 1. 4.
7.
5. 3.
S0001158
Item: 1. 2. 3. 4. 5. 6. 7.
Service accessory: Service box, JBU4 M2BUS adapter cable, DAU4S Service cable, SCS4 Audio cable, ADS1 Service battery, BBS1 Power connector, PCS1 Service software diskette 3.5", Service software diskette 5.1/4" Software protection key PKD1 "dongle" Antenna adapter, AAT2 *)
Product code: 0770041 0730057 0730052 0730011 ? 0730012 0774034 0774035 0750018 0310016
*) Note:
Be very careful when you install the antenna adapter AAT2. The antenna clip in the phone can be damaged very easily
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After Sales Technical Documentation
NHE5 Tuning Instructions
Equipment Setup For Tuning A Phone With Remowing Covers
6.
2. 1. 4.
7.
3.
5.
S0001156
Item: 1. 2. 3. 4. 5. 6. 7.
Service accessory: Service box, JBU4 M2BUS adapter cable, DAU4S Module jig, JBS14 Audio cable, ADS1 Dummy battery, BBS1 Power connector, PCS1 Service software diskette 3.5", Service software diskette 5.1/4" Software protection key PKD1 "dongle"
Product code: 0770041 0730057 0770049 0730011 ? 0730012 0774034 0774035 0750018
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NHE5 Tuning Instructions
After Sales 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 doubleclicking NHE5 Service PCLocals icon When Login windows appears press OK button Choose from main menu Product > New.
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After Sales Technical Documentation
NHE5 Tuning Instructions
Tuning Steps
1. RSSI Reference Signal Level Storage
Reference value for the received signal strength meter are program tuned. RSSI reference signal level programming: Select Tuning > RSSI (AGC).... Connect RF generator to antenna connector at 947.067710 MHz. Adjust signal generator level to 80 dBm + cable attenuation. Press OK button Adjust signal generator level to 55 dBm + cable attenuation. Press OK button. Values should be below ±3.0 dB. Press 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 attenuation. Check that "Cont. mode channel" is 60 The measurement result should be; · Low over < 20 kHz · Middle ±3.0 kHz (depends on generator frequency accuracy) · High below > 20 kHz Press OK button.
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NHE5 Tuning Instructions
After Sales Technical Documentation
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning
The purpose of this tunig 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 Tuning > TX I/Q... Select I/Q tuning values from PC's memory, phone's EEPROM or factory default values. Connect spectrum analyzer (with attenuator if needed) to phone antenna connector. Check that TX power level is level 15, Cont. mode channel is 60 and TX data type is 1. 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
D.C. offset tunings: Set this value to minimum
CHF
+67.71 kHz
> 30 dB
> 35 dB
Amplitude & phase difference: Set this value to minimum
Select option "TX I d.c. offset". Adjust the level of centre frequency (CHF signal) to minimum by varying D/A converter value with < and > buttons. The amplitude difference between CHF67.7 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.
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After Sales Technical Documentation Select option "Tune Amplitude Difference".
NHE5 Tuning Instructions
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 CHF67 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 converter value with < and > keys. When values are correct press OK button.
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NHE5 Tuning Instructions
After Sales Technical Documentation
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... Select I/Q tuning values from PC's memory, phone's EEPROM or factory default values. Set power supply voltage to 6.0 V. Connect pulse power meter or spectrum analyzer to antenna connector. Check that continuous mode channel 60. Adjust the power level (levels 5, 13 and 15) with + and buttons and change levels with and keys. Power level 5 13 15 Tuning POUT/dBm (VB=6.0 V, CH60) 33 17 13
Press Calculate button to calculate all other levels. Once all TX levels are correct, press OK button.
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NHE5 Tuning Instructions
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 Tuning > Charger A/D... In case the phone covers are not removed replace the standard battery of the phone with the service battery BBS1. 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 Tuning > Battery A/D... In case the phone covers are not removed replace the standard battery of the phone with the dummy battery BBS1. 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 OK button.
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