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TUNING INSTRUCTIONS
9618ARo
Technical Documentation
NHC–4
6–3–1
Copyright
©
Nokia Mobile Phones
Contents
Tuning Instructions
General
Required Equipment
Accuracy of the Equipment During Measurement
Equipment Setup
Equipment Setup for Tuning a Phone without Removing Covers
Equipment Setup for Tuning a Phone Removing Covers
Equipment Setup For Tuning A Booster
Starting The Program
Starting options for service software
Tuning Steps of Radio Unit
1. Bias Current Tuning
2. TX Output Power
3. FM Modulator Tuning
4. AFC tuning
5. RFI TX–IQ D.C. Offset Tuning
6. AMPS Demodulation Tuning
7. Analog mode RSSI
8. Digital mode AGC
9. Battery Voltage Adjustment
10. Charge Voltage Adjustment
11. SINAD Level Checking
Tuning Steps of Booster
1. Output Power Tuning
2. Transmitter Frequency Tuning
3. Output Power Check
4. Receiver Calibration
5. Voltage Calibration
6–3–2
6–3–2
6–3–3
6–3–3
6–3–4
6–3–5
6–3–6
6–3–7
6–3–8
6–3–8
6–3–9
6–3–9
6–3–10
6–3–11
6–3–12
6–3–13
6–3–14
6–3–15
6–3–16
6–3–17
6–3–17
6–3–18
6–3–19
6–3–19
6–3–20
6–3–21
6–3–22
6–3–22
TUNING INSTRUCTIONS
9618ARo
Technical Documentation
NHC–4
6–3–2
Copyright
©
Nokia Mobile Phones
Tuning Instructions
General
In contrast to earlier second–generation analog cellular phones tuning opera-
tions of the NHC–4 are carried out using the Service software. The Service pro-
gram turns the phone into the Locals mode, in which the phone can be out-
wardly controlled via the M2BUS interface.
The tuning values of the phone reside on the EEPROM. Before tuning these
values are read to the Service software and the user can change these values
with tuning functions.
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!
TUNING INSTRUCTIONS
9618ARo
Technical Documentation
NHC–4
6–3–3
Copyright
©
Nokia Mobile Phones
Required Equipment
– PC/AT computer with the Service software; see Sect. 5 for intructions on
installation and use.
– M2BUS adapter DAU–2 and other service accessories; see equipment set-
up pictures.
– Audio analyzer
– Spectrum analyzer
– RF power meter, power measurement sensitivity –10 dBm.
– Modulation analyzer with precise frequency measurement.
– RF generator
– Device to provide specified testmodulation to modulate RF generator.
– DMR tester
– Multimeter or DVM.
– Attenuator and branching unit.
– Power supply 1, nom. voltage 12 V.
– Power supply 2, nom. voltage 6 V. This is needed only in that case, if you
want to connect the dummy battery direct to the to power supply.
Accuracy of the Equipment During Measurement
– Power supply 1; nominal voltage 12
±0.5
V current cap. min. 1.5 A for ser-
vice box (JBS–7). If you test or tune also the RF booster BSH–4, you need
power supply, which has 5 A output capacity.
– Power supply 2 ;nominal voltage 6.0
±0.1
V, current cap. min. 1.5 A.
– Mod. analyzer power level resolution 0.1 dB, accuracy
±0.5
dB. Frequency
counter accuracy 0.1 ppm
〈±80
Hz).
– RF generator; frequency res. 10 Hz amplitude res. 0.1 dB frequency stab.
±0.25
ppm.
– Spectrum analyzer; dynamic range 70 dB, accuracy
±1
dB (For power level
measurement accuracy
±0.5
dB).
TUNING INSTRUCTIONS
9618ARo
Technical Documentation
NHC–4
6–3–4
Copyright
©
Nokia Mobile Phones
Equipment Setup
Caution: Make sure that you have switched off the PC and the printer before
making connections !
Caution: Do not connect the PKD–1 key to the serial port. You may damage
your PKD–1 !
Attach the protection key PKD–1 to parallel port one (25–pin female D–connec-
tor) 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 adapter to the serial port (RS–232) of the computer.
In case you are using a 9–pin serial port (normal with an AT set) use the mating
adapter supplied with the M2BUS adapter.
Attach one end of the XCM–1 modular cable to the DAU–2 PC/M2BUS adapter
and the other end to the JBS–7 service box. Use suitable adapter, SCS–1 ser-
vice cable when the covers of the phone are in place, JBS–8 test frame with the
phone covers off, and attach it to the phone. Then connect it to the service box.
TUNING INSTRUCTIONS
9618ARo
Technical Documentation
NHC–4
6–3–5
Copyright
©
Nokia Mobile Phones
Equipment Setup for Tuning a Phone without Removing Covers
Item:
2
3
4
6
8
9
11
12
14
15
16
16
–
Service accessory:
Audio cable, ADS–1
Modular cable, XCM–1
Power connector, PCS–1
Dummy battery, BTS–4
RS–232 adapter (9 pin to 25 pin)
Service box, JBS–7
PC/M2BUS adapter, DAU–2
BCN cable (not available)
Banana cable (not available)
Banana cable (not available)
Service software diskette 3.5”
Service software diskette 5.25”
Software protection key PKD–1 ”dongle”
Product code:
0730011
4626131
0730012
0770009
4626170
0770015
0750006
0774003
0774004
0750018

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