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1. Setting up the SG 631 LOGIC for Record Playback Operation
1.1 Air Circulation
The greatest amount of heat develops around the power transformer
which is located at the center of the ventilating slits. The ventilating slits
must be left free regardless of the machine's operating position. When
installing the machine in a cabinet, a closed section of wall shelves, etc.,
be certain to allow for sufficient air circulation to assure proper heat
exchange.
1.2 Operating Position
The SG 631 LOGIC may be operated in either upright or horizontal
position, or if desired, in any tilted position. In all operating positions,
however, care must be taken that the spools are securely held onto
the hub spindles as described in sec. 1.6 below.
1.3 Extending Connecting Leads
When matching UHER plug-in extension leads are not used, connecting
leads should be extended only by an experienced service technician
(see also sees. 2.3, 2.4 and 2.5).
30
"
1.4 A.C. Mains Connection, Operating Voltage, Frequency,
Mains Fuse
The mains lead is attached to the machine and is located in the cov-
ered recess in the floor (or rear) of the housing (see Fig. 1). Before
plugging the lead into a mains power outlet, ascertain the voltage of
the power supply.
The SG 631 LOGIC is factory-set to an operating voltage of 220 V,
but may be adjusted to operate on 115 V A.C. If necessary, set the
voltage selector to the proper voltage.
Before adjusting the voltage, make certain that no leads are connect-
ed to a mains power outlet and that the mains fuse, located in the
fuse holder "A" (Fig. 1) corresponds with the voltage to be selected.
With the aid of a coin, unscrew the fuse holder. Use a 0.8 A fuse for
220 V A.C., and a 1.6 A fuse for 115 V. Once the proper fuse has been
inserted, the operating voltage may be chosen by turning the voltage
selector "B" (Fig. 1) with a coin. The voltage value selected will appear
in the recess "C" (Fig. 1) of the voltage selector.
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