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1. INTRODUCTION
Your Lecson SFM2 Tuner is a superbly engineered instrument designed to
give the best quality reproduction of stereophonic VHF/FM radio
programmes. The SFM2 has been elegantly designed to match the existing
Lecson range of Hi-fi equipment and to blend aesthetically with domestic
surroundings. The SFM2 may be operated in conjunction with any good
quality amplifiers and tape recorders. It has been built with high
quality components to ensure r e l i a b l e o p e r a t i o n u n d e r n o r m a l
c o n d i t i o n s . W e w o u l d p a r t i c u l a r l y recommend that the SFM2 Tuner be used
with the matching range of Lecson Amplifiers and Loudspeakers.
Please read this Handbook carefully as it is provided so that you may
take full advantage of the facilities of the Tuner and thus obtain the
very best performance from it. Your dealer is there to advise and help
you should any difficulties arise.
2. BEFORE SWITCHING
ON
The SFM2 Tuner is fitted with a 3-core double insulated mains cable.
This cable should be wired as follows:
Brown .......................... to Live line
Blue ........................... to Neutral line
Green/Yellow ................... to Earth (Ground)
THE TUNER MUST NOT BE CONNECTED TO A TWO WIRE MAINS SYSTEM, OR THE EARTH
LEAD CUT BACK
. This wire forms an integral part of the SFM2 internal
circuitry and screening; a loud hum will therefore result if the unit is
incorrectly earthed.
When used with the AC1 pre-amplifier the two units should be wired
separately to the mains supply. They should only be linked using the
recommended type of audio lead.
Under no circumstances should the SFM2 be opened unless the mains supply
is disconnected.
3. INTERCONNECTIONS
Facilities are provided to enable the SFM2 to be connected to a VHF/FM
aerial having an impedance of 75 ohms (Co-axial cable) or 300 ohms
(Balanced Twin Feeder).
The audio output is via a 5 pin DIN socket which should be connected to
an audio input on an amplifier or tape recorder having a flat frequency
response and an input impedance greater than 50 ohms. When a 'straight'
DIN lead (pin 1 connected to pin 1 etc.) is used, the output level can be
varied from zero to 1V by adjustment of the preset volume controls
adjacent to the output socket. (See fig. 1). Connection to the Lecson
AC1 is shown in the AC1 instruction manual, fig.4
