Factory Service
Please refer
to the terms of your Orban Associates Limited
One-Year
Standard
Warranty
,
which
extends to
the first
end-user. This warranty was packed
with
the
424A but is not
bound with this
manual.
After expiration of the warranty,
a
reasonable charge
will
be
made for parts, labor, and packing if you choose to
use
the factory service
facility. Repaired
units
will
be
returned
C.O.D.
In
all
cases,
transportation charges
(which
are usually quite
nominal)
shall be
borne
by
the
customer.
After
a formal
Return Authorization number is
obtained
from
the factory, units
should
be shipped to CUSTOMER SERVICE at
the
address shown
on
the
front page
of this
manual.
YOUR
RETURN
AUTHORIZATION
NUMBER MUST
BE SHOWN ON
THE
LABEL,
OR
THE PACKAGE WILL
NOT
BE ACCEPTED!
Shipping
Instructions
If
the
original packing
material
is
available,
it
should
be used. Otherwise,
a
carton
of
at least
200
pounds
bursting
test and no smaller than
22"
x
15"
x
9"
should be
employed.
The
424A
should be packed so
that
there is at
least
1-1/2"
of packing
material
protecting every point. A plastic wrap around the
chassis will protect the
finish.
Cushioning material
such
as Air-Cap, Bubble-Pak, foam "popcorn", or fibre blankets
are acceptable. Folded newspaper is
not
suitable. Blanket-type materials should be
tightly wrapped
around
the
424A and
taped
in place to prevent
the
unit
from
shifting
out of
its
packing and contacting
the
walls of the carton.
The carton should be
packed
evenly
and
fully
with
the packing material filling
all
voids such that the unit
cannot
shift in
the
carton. Test
for
this
by closing
but not
sealing
the
carton and
shaking
vigorously. If
the unit
can
be felt
or
heard
to
move,
use
more packing.
The carton should be well-sealed with
3"
reinforced sealing
tape
applied
across the
top
and
bottom of the
carton in an
"H"
pattern. Narrower or parcel-post type
tapes will
not stand
the
stresses applied to commercial shipments.
The
package should be marked with the
name
of the
shipper,
and the words
in
red: DELICATE INSTRUMENT,
FRAGILE! Even so,
the
freight
people will
throw
the
box around
as
if it were filled with junk. The survival
of
the unit
depends
almost
solely
on the
care taken in packing!
3: CIRCUIT
General: Except for the power
supply,
the
"A" and "B" channels
of the dual-
DESCRIPTION
channel 424A
are
independent
and identical.
The
circuitry is divisible into six major
blocks.
These
are:
1)
input
buffer
2)
voltage-controlled
amplifier
3)
compressor/limiter control
circuitry
4)
de-esser control circuitry
5)
VCA LEVEL meter driver
6
)
power
supply
31
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