Nokia 2190 Service Manual Tuning
Programmes After Market Services (PAMS)
Technical Documentation
NHB–3 TUNING
INSTRUCTIONS
PAMS
Technical Documentation
AMENDMENT RECORD SHEET
NHB–3
Tuning Instructions
Amendment
Number
Date Inserted By Comments
Original 26/97
2
PAMS
Technical Documentation
TUNING INSTRUCTIONS
Contents
Tuning Instructions 4
General 4
Required Equipment 5
Equipment Setup 5
Equipment Setup For Tuning A Phone Without Remowing Covers 6
Equipment Setup For Tuning A Phone With Remowing Covers 7
Starting The Program 8
Starting options for Service software 8
Tuning Steps 9
1. AFC Diagram Storage 9
2. RSSI Reference Signal Level Storage 10
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning 11
4. Tuning of Transmitter Power Levels 13
5. Charge Voltage Adjustment 14
6. Battery Voltage Adjustment 14
NHB–3
Tuning Instructions
Original 26/97
3
PAMS
Technical Documentation
Tuning Instructions
General
Almost all tuning operations of the NHB–3 are carried out using the Service
software. The Service software turns the phone into the service mode, in which
the phone can be outwardly controlled via the M2BUS interface.
Tuning is based on the Service 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 Service software
enables writing the default parameters on the EEPROM (Factory Reset), in
which case all tuning steps should be carried out.
N.B. During tuning, proceed as follows:
NHB–3
Tuning Instructions
– Take care not to damage sensitive measuring instruments with excessive
RF power, use attenuator if needed.
– 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!
Original 26/97
4
PAMS
Technical Documentation
Required Equipment
– PC/AT computer with Service software; see specific section for intructions
on installation and use of Service software.
– M2BUS adapter DAU–2 and other service accessories; see equipment set-
up pictures.
– Multimeter or DVM.
– DCS1900 radio telephone test station or separate measuring equipment as
follows:
– RF generator
– pulse power meter
– spectrum analyzer
– attenuator and branching unit
Equipment Setup
NHB–3
Tuning Instructions
To set up the equipment, 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. Turn
off the computer before connecting to avoid possible damage to the serial port.
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, RF cable
with the proper RF antenna replacement adapter when the covers of the phone
are in place, JBS–16 test frame when the phone covers are off, and attach it to
the phone. Then connect the phone or the cables of test frame JBS–16 to the
service box JBS–7.
While replacing the antenna with the RF adapter, carefully remove the antenna
of the phone and the plastic tube and replace it with the TDA–1 antenna adapter. Do not overtighten the RF adapter or the antenna support threads may
get stripped and replacement of antenna bracket will be necessary.
Original 26/97
5
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