Transmitter; General Instructions For Tx Troubleshooting; Amps/Tdma; Gsm1900 - Nokia NPM-2NX Troubleshooting Manual

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NPM-2NX

Troubleshooting

Transmitter

Always use an RF-cable connected from an external RF-connector to analyzer via (rf-

power) attenuator. This is important to protect analyzer against excessive RF-power and

not allow leakage of undesired RF-power into RF-power into cellular frequencies.

Start Phoenix-software and select TX mode under testing (AMPS, DAMPS or TDMA1900).

It is useful to select mid channel (383 for AMPS/DAMPS or 1000 for TDMA1900) and

power level 2. Select random data for digital mode of operation.

After any component change tune the phone with Phoenix auto tune SW.

Start Phoenix-software and select GSM RF Control, PL0, Ch661 and TX data type random.

AMPS/DAMPS

UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (SAFARI) ->

Dual TX IF-BPF -> Up converter (mixer -> C904 -> driver) -> BPF -> PA -> Power detec-

tor -> Duplex-filter -> Diplexer -> EXT RF-connector -> Antenna

TDMA1900, GSM1900

UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (SAFARI) ->

Dual TX IF-BPF -> Up converter (Mixer -> BPF -> Driver) -> BPF -> PA -> Power detector

-> Duplex-filter -> Diplexer -> EXT RF-connector -> Antenna

The power detection and power control circuit belongs under power control part of this

Page 44

ãNokia Corporation

CCS Technical Documentation

Issue 1 07/02

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