Nokia 636, 638 Service Manual tuning
After Sales Technical Documentation
TUNING
INSTRUCTIONS
NMP Part No. 0275034Original, 4/96
Tuning Instructions
After Sales
Technical Documentation
AMENDMENT RECORD SHEET
Amendment
Number
Date Inserted By Comments
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Original, 4/96
After Sales
Technical Documentation
TUNING INSTRUCTIONS
Contents
Introduction Page 4
General Page 4
Required Equipment Page 4
Equipment Setup Page 5
Equipment Setup For Tuning A Phone Without Removing Covers Page 6
Equipment Setup For Tuning A Phone With Removing Covers Page 7
Starting The Program Page 8
Starting Options for Service Software Page 8
Tuning Steps Page 9
Initialize Local Mode Page 9
Battery Reference Page 9
Reference Charge Voltage Page 9
VCO Page 10
VCXO Page 10
TX Power Level Tuning Page 11
Deviation Tuning Page 12
RSSI Reference Value Page 13
Tuning Values Page 13
Tuning Instructions
Original, 4/96
Page 3
Tuning Instructions
Introduction
General
In contrast to earlier second–generation analog cellular phones tuning operations of the NHA–2 are carried out using the PCLocals software. The PCLocals
program turns the phone into the Locals mode, in which the phone can be outwardly controlled via the M2BUS interface.
Tuning is based on the PCLocals software communicating with the D/A and A/D
converters of the phone.
The calibration data of the phone resides on the EEPROM. The contents of the
EEPROM can be read by the PCLocals software. The program also enables
writing of the factory preset calibration data to the EEPROM, after which the
whole tuning process should be carried out.
If a repair has been carried out on the RF section of a system module then
the appropriate tunings should be performed as described in the following section and using the on–screen help menus as a guide. Spare system modules
will be delivered pre–tuned from the factory and will not require re–tuning.
After Sales
Technical Documentation
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 PCLocals software; see Sect. PCLocals intructions on
installation and use.
– M2BUS adapter DAU–2 and other service accessories; see equipment set-
up pictures.
– Audio analyzer
– RF power meter, power measurement sensitivity –10 dBm.
– RF generator
– Device to provide specified testmodulation to modulate RF generator.
Page 4
– Multimeter or DVM.
– Attenuator and branching unit.
– Power supply, nom. voltage 12 V.
Original, 4/96
After Sales
Technical Documentation
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–connector) 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 service cable, DAU–4S, to the serial port (RS–232) of
the computer. Attach one end of the service cable to the PC serial port and the
other end to the service box, JBU–4. 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 JBU–4. When the phone covers are removed
the RF connection on the extension cable should be used instead.
Tuning Instructions
For audio measurements connect the service cable, SCS–4, as follows:
– EAR line to AF INPUT of test equipment
– MIC line to MOD GEN OUTPUT of test equipment
Original, 4/96
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