Crown D-150 - Accessory Panel Kit Installation

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The D-150 may be custom oF rack-miounted if an accéssory front-
panel kit with rack-mounting brackets was purchased. The
installation of this kit is detailed in Figure 3-2. Refer to Figure
3-1 for mounting dimensions. Sufficient ventilation must be pro-
vided forthe unit. Airmust be allowed tocirculate overthe chassis,
atherwise. the amplifier.will-intenmitiently tur off due to the -
internal. thermal. protection. feature...Applications +-.other-than
standard “Hi-Fi” — requiring long, sustained signaisathigh power
levels may require the use of a cooling fan.
3.4. ACCESSORY PANEL pis INSTALLATION
MODEL PK)... 05
To install the D-150 amplitier ina : “custom configuration’ ue
cessory cabinet (Model 5-D or 5-R) or a rack, the accessory front
panelmust be-attached:first: Referto Figure: 3:2eso2.0006
1. Pull four rubber feet off the bottom of the amplifier,
2. Place amplifier on bench or table: stand on end with trans:
former. down,
“Amplifier” onthe front panel should foe tb
cpanel being-instalied: sae
4. Plastic wedges supplied with the panel kit should be forced inta
positions Land 2or Hoth ends of the unit as far as possible. Clip
or break off the excess part of the plastic wedges ~
5. Align-end-caps-to-the-unit-so-holes.“A”-and “B" match th
caps. Use 6/32 x % socket cap screws. (NOTE: Socket screws
may look as though they are cross threading but willstraighten
approximately half way through)
in. a “custom installation”, install a solid shelf to support.the
amplifier..The -shelf-top-surface should: be- flush with the bottom
edge of the required L6%," wide.x 5%" high-panel cutout.
When using angle brackets for rack mounting (Figure 3-2) always
have the brushed side of the anglé-bracket toward you. Simply
mount the end-brackets in-place of the end caps and rack mount:
as shown in Figure 3-1.
FIGURE 3-2.
PANEL
KIT
MOUNTING
-on
to
Figure
2.3,
In
applications
where
the
load
is
a
loudspeaker,
amplifier
protection
will
be
evidenced
by
distortion
inthespeaker.
fatchtheend. -
3.5
AMPLIFIER
PROTECTION
MECHANISMS
The
D-150
is
protected
against
all
the
common
hazards
which
Plague
highpower
amplifiers,
including
shorted,
open,
and
mis-
matched
loads;
overloaded
power
supplies;
excessive
temper-
ature;
chain
destruction
phenomena:
input
overiond
tetiee
and
high
frequency
overload
blowups.
é
Protection
against.
shorted
and
misrnatched-ioads
is:
‘provided:
by
an
instant-acting
Jimiter
which
instantaneously
linits
at
the
volt-
ampere
product
to
the
maximum
safe-stress.
value
eve
transistors...
“
The
area
in
which
the
amplifier
will
drive
the
load
without
being
V-i
limited
is
depicted
by
the
cross-hatched
areas
of
Figure
3-3.
if
a
load
initiates
protection
in
the
amplifi
it
can
‘be
detected
generally:
by.
watching:
the
wanster,
characteristics
ofthe
amplifier
Hy
The
audible
effect
ranges
from
something
resembling
cross-
overnatch
distortion
to
a
snapping
sound,
depending
on
the
overall
load
characteristics,
Speaker
systerns
which
are
truly
8
ohms.
or
greater
will
not
initiate
the
protection
system.
; FIGURE 3-3.
GRAPH
of
V-1
OPERATING
RANGE
of
D-180
OUTPUT
&,
y
ea