SME 20/2, Instructions Manual

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9. SETTING UP
1. For transit the main bearing is off-loaded by four pulley transit screws. These are captive
and should be turned anti-clockwise with the 3mm A/F ball-ended hexagon wrench until
they stop. Ensure the wrench is fully engaged to avoid damage to the transit screw socket.
2. Unpack the drive belt and place it over the driven pulley. Press it down as far as the flange,
ensuring that it is free from twists, then stretch it over the motor pulley. The pulleys will be
out of alignment without the weight of the platter so rotation must not take place until it
has been fitted.
3. Now fit the platter. Place it carefully and squarely over the turntable spindle and lower it
gently down until it rests on the driven pulley, having first ensured that both mating
surfaces are clean. Rotate the platter slowly by hand to position the belt on the pulleys.
WARNING
: Please avoid handling or anything that might scratch the turntable platter. The
material is as delicate as a record itself and very easily damaged.
4. The base should now be levelled by rotating the supporting feet. The feet will turn more
readily if the corresponding corner of the base is lifted slightly at the same time.
5. The Model 20/3 is intended to receive SME precision pick-up arms such as the Series V,
Series IV or Series 300 Model 309.
6. If you are not already familiar with SME precision pick-up arms, carefully study the
instruction book at this point. Fit the cartridge of your choice. Ensure that the four socket
cap screws holding the arm mounting plinth to the sub-chassis are tight. The arm should
now be secured to the plinth using the four M3 x 12mm socket cap screws already in it.
Rotate the output socket on the underside of the arm so that it lies parallel with the right
hand side of the base and its mouth facing the front. Plug in the audio lead arranging it to
clear the base. Two cable clamps are provided on the underside of the sub-chassis to secure
the audio lead and allow it to exit either to the rear or the right hand side of the turntable.
7. The upper gallery cover at the top of each of the four columns has a small central hole. To
adjust the height of the sub-chassis insert the 3mm A/F ball-ended hexagon wrench
engaging the socket within. Clockwise rotation will then raise the sub-chassis and the
reverse will lower it.
8. Adjust the sub-chassis suspension at each point so that the Height Setting Gauge (1165)
will enter easily between the points indicated on page 7. This will set the gap at 3mm, if it
is desired to increase sub-chassis isolation because of unusually close proximity to the
speakers the recommended gap can be exceeded by up to 2mm. After adjustment hold the
sub-chassis fully down, then release it. Check and readjust as needed, noting that new
suspension bands take a little while to settle down. A single band arranged horizontally
beneath the sub-chassis centralises it against the pull of the driving belt.
9. Rotate the platter slowly by hand to ensure that the drive belt takes up a central position on
the crown of the motor pulley.
10. Unpack the power supply unit, the mains voltage setting is indicated on the back panel.
Before fitting the power cord check carefully that this matches your mains voltage.
11. The power cord has a standard moulded mains plug. In the event that it must be replaced
the original plug should be cut off and disposed of responsibly.
12.
WARNING!
To meet international safety standards the power supply unit is earthed
through the yellow/green wire of the power cord and particular care must be taken to
ensure that this is connected so as to maintain effective earthing should the original mains
plug be changed.
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