Uhf Synthesizer; Vhf Synthesizer - Nokia NME-2A Series Troubleshooting Instructions

P.A.M.S.
Technical Documentation

UHF Synthesizer

Via PCLocals select local mode, RF control, TX mode, Power level 10
(23 dBm), Operation mode burst, Data type random, Continuous mode
channel 60, Channel 60, Monitoring channel 1. The synthesizer will switch
between channel 60 and channel 1.
– Freq. ch 1 = 1006.2 MHz, ch 124 = 1039.8 MHz.
– Measure with probe and scope on J904 to see the tuning voltage. It
should switch between 1 and 2 volt. Select channel 124 and it should
switch between 1 and 4.5 volt.
– J902, 26MHz ref: 26 MHz, >2 V
– Measure at the collector of V904 (UHF TX) and of V906 (LO UHF) to
see that they alternately are on.
– With a probe connected to the spectrum analyzer, check the RF sig-
nals. The level when they are active should be about 6 dBm.

VHF Synthesizer

Via PCLocals select local mode, RF control, TX mode, Power level 10
(23 dBm), Operation mode burst, Data type random, Continuous mode
channel 60, Channel 60, Monitoring channel 1.
– Freq. all channels = 232 MHz. The prescaler is placed in V701 and di-
vides the frequency with 2.
– Check the tuning voltage at J903, 3 1.5 V, and check that it moves
when a finger is placed at the oscillator.
– J902, 26 MHz ref: 26 MHz, >2 V
– Check the supply at V902 or C903, 5 V.
– Output level at C914/R911 should be –10 dBm.
Original 08/97
Troubleshooting Instructions
PP
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NME–2A
Page 19