Text preview for : tuning.pdf part of Nokia 3110 Service Manual, Troubleshooting, Part, Variant, Tools, Schematic, ecc. (issue 2 11/97) - File 20
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Programmes After Market Services
NHE8/9 TUNING INSTRUCTIONS
issue 2 11/97
NHE8/9 Tuning Instructions
PAMS Technical Documentation
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Setup for Tuning a Phone without Removing Covers . . . . . Equipment Setup for Tuning a Phone with Covers Removed . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. LCD Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 Page 3 Page 3 Page 5 Page 6 Page 7 Page 7 Page 7 Page 7 Page 8 Page 9 Page 10 Page 10 Page 10
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issue 2 11/97
PAMS Technical Documentation
NHE8/9 Tuning Instructions
Introduction
General
In contrast to earlier secondgeneration analog cellular phones almost all tuning operations of the NHE8/9 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. 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 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
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NHE8/9 Tuning Instructions
PAMS Technical Documentation
Caution: Caution:
Make sure that you have switched off the PC and the printer before making connections ! 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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PAMS Technical Documentation
NHE8/9 Tuning Instructions
Equipment Setup for Tuning a Phone without Removing Covers
5.
2. 6. 1. 4.
3.
Service accessory: 1.Service box, JBU4 2.M2BUS adapter cable, DAU4S 3.Service cable, SCS4D 4.Audio cable, ADS1 5.Power connector, PCS1 6.Service software diskette 3.5`` Software protections key PKD1
Product code: 0770041 0730057 0730116 0730011 0730012 0774067 0750018
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NHE8/9 Tuning Instructions
PAMS Technical Documentation
Equipment Setup for Tuning a Phone with Covers Removed
5.
2. 1. 4. 6
3.
Service accessory:
Product code: 0770041 0730057 0770070 0730011 0730012 0774067 0750018
1.Service box, JBU4 2.M2BUS adapter cable, DAU4S 3.Module jig, JBS18 4.Audio cable, ADS1 5.Power connector, PCS1 6.Service software diskette 3.5`` Software protection key PKD1
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PAMS Technical Documentation
NHE8/9 Tuning Instructions
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 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
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. Difference values should be between ± 5.0 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;
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NHE8/9 Tuning Instructions
PAMS Technical Documentation
· Low > 20 kHz · Middle ±3.0 kHz (depends on generator frequency accuracy) · High < 20 kHz Press OK 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 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 10, 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 CHF
D.C. offset tunings: Set this value to minimum
+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. Amplitude difference between CHF67.7 kHz and CHF should be Select option "TX Q d.c. offset". Adjust the level of signal CHF to minimum by varying D/A converter value with < and > keys. >30 dB.
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PAMS Technical Documentation Select option "Tune Amplitude Difference".
NHE8/9 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.
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 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 and keys. Power level 5 13 15 Tuning POUT/dBm (VB=7.2 V, CH60) 33 17.0 13
Press Calculate button to calculate all other levels. Once all TX levels are correct, press OK button.
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NHE8/9 Tuning Instructions
PAMS Technical Documentation
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. 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... Apply +6 V Software reads 6 V, A/D reading fed to phone VBAT line. Store correct value to phone EEPROM by pressing OK button.
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 Tuning > LCD A/D... Enter the actual environment temperature and press OK button. (The LCD must be calibrated at a temperature of 25 ±1 degrees centigrade). Select Tuning > Display... 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. 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.
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NHE8/9 Tuning Instructions
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