Receiver; General Instructions For Rx Troubleshooting; Path Of The Received Signal; Amps Rx - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

PAMS Technical Documentation

Receiver

General instructions for RX troubleshooting

Start the WinTesla–software and use it to start the desired RX–mode of
the mobile phone. The troubleshooting flowchart is divided into three
steps, general checking, local checking and RX–chain checking. Please
notice that before changing ASICs or filters, all solderings and missing
components are checked.
IF any RX–filters and/or ASICs are changed, AGC–tunings have to be
made!
Connect the desired channel frequency and level to the antenna inter-
face.

Path of the received signal

Block level description of the receiver:
Antenna
Diplexer
Duplexer
Low Noise Amplifier (LNA)
RX filter
First mixer
116.19 MHz filter
IF–amplifier
AGC/buffer
second mixer
450 kHz filters
buffer/limiter
Baseband( FM–detector).

AMPS RX

Diagram on the next page.
Issue 1 12/99
E Nokia Mobile Phones Ltd.
Disassembly & Troubleshooting
NSW-6
Page 25