Service Manual

Antenna Switch
In receive, the diode D205 are reverse biased. L212 is now in circuit, passing
the signal from the antenna to the SAW filter of F101.
SAW FILTER
The receiver signal is routed to pin 4 of the F101. It passes through the
band pass filter .
The input signal is coupled to the base of Q101 which serves as an RF amplifier.
The output of Q101 is then coupled to the first mixer.
First Mixer
Q102, 2-pole crystal filters XF1 and coils L103 and C120 form the First Mixer
and First IF Filter.
The RF signal, from the SAW filter and amplifier Q101 is
applied to the VCO local oscillator signal to make mixer.
The difference frequency of 21.4 MHz is taken from Q102 and is filtered by the crystal
filters XF1. The tuned circuits L103 and C120 and associated components provide
matching of the crystal filters to ensure a good pass-band response and selectivity.
The IF signal is amplified by Q104 and passed to the FM Detector IC.
Second mixer, Second IF, FM detector
The output of the IF amplifier is fed into the narrowband FM IF Integrated Circuit,
IC101 (MC3361). This is a single conversion FM receiver which contains the second
mixer, second IF amplifier, and FM detector.
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