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PAMS Technical Documentation NSM1 Series Transceivers
Tuning Instructions
Original 10/98
NSM1 Tuning Instructions
PAMS Technical Documentation
CONTENTS
Tuning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Equipment Setup for Tuning a Phone without Removing Covers . . . . . . . 5 Flash Concept for NSM1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Tuning With Covers Off Using Testframe JBS19 . . . . 7 Tuning With Covers Off using Light Jig JBT1 . . . . . . . . 8 Warranty Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Tuning Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1. RX Calibration (AGC + AFC) . . . . . . . . . . . . . . . . . . . . . . 10 2. Alignment of Transmitter Power Levels . . . . . . . . . . . . . 12 3. I/Q Modulator Alignments . . . . . . . . . . . . . . . . . . . . . . . . . 14 4. Energy Management Calibration . . . . . . . . . . . . . . . . . . . 16
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NSM1 Tuning Instructions
Tuning Instructions
General
All tuning operations of the NSM1 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 MBUS 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. 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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Required Equipment
PC with service software; see separate section for instructions on installation and use. 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, DAU9P, 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, JBA4. For servicing the phone with the covers in place the service box should always be used. When the phone covers are removed the jigs should be used. For audio measurements connect the audio cable, ADS1, as follows: EAR line to AF INPUT of test equipment MIC line to MOD GEN OUTPUT of test equipment
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NSM1 Tuning Instructions
Equipment Setup for Tuning a Phone without Removing Covers
4.
1.
5.
2.
3. Item: 1 2 3 4 5 6 Service accessory: Service Battery BBD3 DC Cable SCB3 Service MBUS Cable DAU9P Software protection key PKD1 Service SW diskette 3.5" for WinTesla Service SW diskette 3.5" for NSM1 Product code: 0775071 0730114 0730109 0750018 0774046 0774080
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Flash Concept for NSM1
10.
13. 12. 11. 6. 4. 9B. 5. 1. 2. 3. Item: 1 2 3 4 5 6 7 8 9A 9B 10 11 12 Service accessory: Flash Loading Adapter FLA5 Flash Security Box TDF4 Prommer FPS4S Service Battery BBD3 Service Cable SCH5 DC Cable PCC1B D15 D15 Cable AXS5 (Included in FLA5 sales pack) Printer Cable (Included in FPS4 sales pack) D9 D9 Cable AXS4 (Included in FPS4 sales pack) D9 D9 Cable AXS4 Software protection key PKD1 Service SW diskette 3.5" for NSM1 Service SW diskette 3.5" for WinTesla Travel Charger ACH6E (Euro) Travel Charger ACH6U (USA/Japan) Travel Charger ACH6X (UK) AC Charger ACL3E (Included in FPS4 sales pack) Product code: 0080178 0770106 0085095 0775071 0730098 0730053 0730091 0730029 0730090 0730090 0750018 0774080 0774046 0270381 0270382 0270380 0680015 7. 8. 9A.
13
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NSM1 Tuning Instructions
Tuning With Covers Off Using Testframe JBS19
8. 3. 4.
9. 6. 1. 7. 5. 2.
Item: 1 2 3 4 5 6 7 8 9
Service accessory: Module Jig JBS19 * SIMCard Holder CAH1 Service Audio Box JBA4 ** DC Cable PCS1 External Antenna Cable XRC1B Service Cable SCH5 ** Service MBUS Cable DAU9S ** Audio Cable ADS1 Software Protection Key PKD1 Service SW diskette 3.5" for WinTesla Service SW diskette 3.5" for NSM1
Product code: 0770098 0770112 0770094 0730012 0730128 0730098 0730108 0730011 0750018 0774046 0774080
*) **)
The nominal operating voltage for JBS19 is 3.6 V. The supply voltage for JBS19 must never exceed 5.0 V SCH5, JBA4, and DAU9S can be replaced with DAU9P
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Tuning With Covers Off using Light Jig JBT1
8.
3. 4. 9.
1.
7. 6.
5. 2.
Item: 1 2 3 4 5 6 7 8 9
Service accessory: Light Module Jig JBT1 * Service Audio Box JBA4 ** DC Cable PCS1 External Antenna Cable XRC1B Service Cable SCH5 ** Audio Cable ADS1 Service MBUS Cable DAU9S ** Software Protection Key PKD1 Service SW diskette 3.5" for WinTesla Service SW diskette 3.5" for NSM1
Product code: 0770109 0770094 0730012 0730128 0730098 0730011 0730108 0750018 0774046 0774080
*) **)
The nominal operating voltage for JBT1 is 3.6 V. The supply voltage for JBT1 must never exceed 5.0 V SCH5, JBA4, and DAU9S can be replaced with DAU9P Original 10/98
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NSM1 Tuning Instructions
Warranty Transfer
1.
Item: 1
Service accessory: Warranty Cable SCH6
Product code: 0730099
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Tuning Steps
1. RX Calibration (AGC + AFC)
Procedure Follow the steps described in chapter "Service Software Instructions" section "RX calibration... command". Software reports the following: AFC init value AFC slope PSW slope AGC DAC values and the corresponding voltages for each gain step (0 57 dB) Limits for the reported values If everything went well the reported values should approximately be the following:
Parameter AFC init value AFC slope PSW slope AGC 0 dB AGC 57 dB Difference between the two neighbour AGC steps Low limit 80 130 250 400 100 10 High limit 80 230 350 640 300 20
Troubleshooting If the calibration does not succeed the software normally reports "Unable to read data from phone" or "Failed to set high reference" or "Failed to set low reference". In this case check first the basic functionality of the receiver chain: RF generator frequency set as in the calibration and level for example to the high reference value. Then go to the RSSI reading menu (under RF controls). If the reading is very low there is something broken in the receiver and must be found by measuring voltages and signal levels at different places (information of these can be found elsewhere in this manual). If the RSSI reading seems to be within 5 - 10 dB the same as the RF input level check that the VCTCXO (G650) frequency is close enough the Original 10/98
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NSM1 Tuning Instructions
wanted frequency. This is most easiest done by measuring the UHF VCO (G550) frequency because the absolute value of the deviation is biggest there. In the GSM mid channel the UHFVCO frequency should be 2040.0 MHz. If the deviation is bigger than about +/20 kHz it is probable that the VCTCXO is not operating correctly. If both of these (RSSI reading and the frequency) seem to be correct and calibration still fails the most probable reason is that there is a little lack of gain somewhere or the AGC gain control slope in N600 is out of the limits. This can be verified by changing the generator reference levels from the demanded ones in the calibration procedure in 1 dB steps up and down. If the calibration goes through with some reference levels the corrective action is most probably changing N500 or N600.
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2. Alignment of Transmitter Power Levels
Equipment: Pulsed power meter or spectrum analyzer and 10 dB attenuator. Voltage source set to 3.6 V. The following settings for the spectrum analyzer are recommended when aligning the power levels: zero span, resolution and video bandwidths 1 MHz, input attenuation 40 dB, sweep time 1 ms, video triggering. NOTE! If spectrum analyzer is used in power level alignment the reading needs to be calibrated with a power meter after every power up. Procedure: Follow the instructions given in chapter "Service Software Instructions" section "TX power... command". For GSM the alignment channel is 60 (902 MHz) and for PCN 700 (1747.8 MHz). The side channels for GSM are 1 (890.2 MHz) and 124 (914.8 MHz) and for PCN 512 (1710.2 MHz) and 885 (1784.8 MHz). Targets in dBm:
Power level GSM PCN 29.5 28 26 24 22 20 18 16 14 12 10 8 5 2
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0 1 2 3 4 5 6 7 8 9 32.5 31 29 27 25 23 21 19 17 15 13 11 9 7 5 10 11 12 13 14 15 16 17 18 19 6.5 3.5 Base 20 15
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NSM1 Tuning Instructions
It is recommended that all the power levels are separately aligned although there is a possibility to align only three and calculate the rest. This is due to the fact that the calculation is not accurate enough, especially for PCN lowest power levels where the targets are NSM1 specific. NOTE! Base level must be adjusted manually because the calculation most often fails.
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3. I/Q Modulator Alignments
I/Q modulator alignments are performed in PCN band. If GSM band has been selected and I/Q alignment is started, the service software asks to change to PCN band. If the user wants to continue in GSM, the adjusted values can only be saved to PC memory, not to phone's EEPROM. After changing to PCN band values from PC memory are available, and if the modulator adjustment is good, also the values can be saved to phone's EEPROM. See chapter "Service Software Instructions" and section "TX I/Q... command" for further information. Procedure: Connect the spectrum analyzer to the phone antenna connector. The recommended spectrum analyzer settings are: span 200 kHz, resolution BW 10 kHz, video BW 1 kHz, sweep 500 ms, input attenuation 30 dB. From RF controls menu make sure that TX data type is 1. Go to TX I/Q tuning menu. The alignment channel for PCN is 700 (1747.8 MHz). Select the "TX I DC offset" option and adjust the level of the centre frequency (CHF) to minimum. Select the "TX Q DC offset" option and adjust the level of the CHF again to minimum. After finding both minima change "TX I DC offset" by step or two from the current value to both directions to see, whether better minimum can be found for CHF. Select the "Amplitude Difference" option and adjust the level of the unwanted sideband CHF + 67.71 kHz to minimum. Select the "Phase Difference" option and dajust the level of CHF + 67.71 kHz again to minimum. After all the minima have been found press "Save" button to store the values to phone EEPROM. Targets: The level of the centre frequency CHF should be at least 30 dB down to the wanted sideband CHF - 67.71 kHz. The level of the unwanted sideband CHF + 67.71 kHz should be at least 35 dB down to the wanted sideband CHF - 67.71 kHz. Alignment verification in GSM band: Go to Product > Initialize > Normal mode. This is needed to give a SW reset for the phone. Which in turn is needed to get the aligned I/Q values in use. Go to Product > Band > GSM Go to RF controls menu and start transmission on channel 60, power level 10, TX data type 1. Original 10/98
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NSM1 Tuning Instructions
Check the levels of CHF and CHF + 67.71 kHz. Both the levels should be at least 30 dB down to the wanted sideband CHF - 67.71 kHz. If both or either of the specifications is not met adjust the the required values (I and Q DC offsets for CHF and amplitude and phase for CHF + 67.71kHz) to meet the specifications. 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
Store the results in PC memory. Go to Product > Band > PCN and then to TX I/Q Tuning to check the alignment with the values which are in PC memory. If the specifications are not met in PCN the solution is to find compromise values which are not optimum for either bands but still meet the specifications. If the PCN band alignment is good with the values from PC memory, the TX I/Q tuning procedure can be stopped by pressing the "Save" button.
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4. Energy Management Calibration
See chapter "Service Software Instructions" and section "Tuning Energy Management Calibration... command" for further information.
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