Receiver Troubleshooting; General Instructions For Rx Troubleshooting; Path Of The Received Signal; Fault Finding Charts For Receiver Chain - Nokia NKC-1X Series Troubleshooting Instructions

CCS Technical Documentation

Receiver Troubleshooting

General instructions for RX troubleshooting

Start the Phoenix-software and use it to start the required RX-mode of the mobile
phone. The troubleshooting flowchart is divided into three steps: (1) general checking, (2)
local checking and (3) RX- chain checking.
Note: Before changing ASICS or Filters, all solderings and missing components must
be checked visually. After any possible component changes, the phone must be
tuned with the Phoenix autotune SW .

Path of the received signal

Block level description of the receiver:
(Antenna/ext RF) – Diplexer – Duplexer – Low Noise Amplifier (LNA) – RX band filter –
First mixer – 135.54 MHz RX IF filter – IF-amplifier – second mixer – 14 kHz low-pass fil-
ter – adjustable IQ amplifier – Baseband.

Fault finding charts for receiver chain

AMPS
Issue 1 02/03
Nokia Corporation
Troubleshooting Instructions
NKC-1X
Page 21