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5.4 Mounting in a 19” rack
The SM30 Control Centre is available in
two versions:
LBB 1280/30 for table top use including the
cover.
LBB 1280/40 for 19” rack mounting,
without cover but including the mounting
brackets.
Removing Feet
WARNING: Before attempting to open
the housing, the mains lead and the 48 V
DC battery plug should be disconnected.
It is not sufficient to merely switch off the
ON/OFF switch on the front panel.
The feet of the Control Centre may be
removed for rack mounting if space is
limited. To remove the feet simply unscrew
the cross-headed screw which is recessed in
the centre of each foot.
If rack space is not limited however, it is
preferable to leave the feet in position and to
mount a narrow blank rack panel beneath
the unit. If the Control Centre then has to
be removed for servicing, the feet will
protect the surface of furniture from being
scratched by metal components of SM30.
Calculating Required Rack Space
To simplify ordering of modular units and
panels to fit into standard 19” rack units,
Philips have chosen a standard height ‘HE’
equal to 44.55 mm (1.75 inches). Each
SM30 Control Centre, for instance, is 3 HE
high, requiring 133.65 mm of rack space.
The use of the HE unit eases the problem of
calculating the number of equipment
housings, blank panels, etc. that will fit into
a rack.
General Rules
Certain rules should be observed when
planning the equipment layout in a rack:
1 To ensure that the SM30 display is clearly
visible, and the controls are easy to
operate, the Control Centre should be
mounted at a height which makes it easily
accessible (head, or shoulder height if
possible).
2 Cassette front loaders, tuner scales, and
other frequently used equipment, should
be mounted at a height which makes
their front panels clearly visible to the
operator.
Fig. 5.4 - Rack mounting
3HE
PHILIPS
SM30
Power
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GB/SM 30 user manual 5/26/98 10:18 AM Page 14