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With
EQ OUT,
measure
the signal
with
an
AC VTVM or DVM
across the output terminals of
the
Model
562*
Adjust
the
trimpot
R1 for
a
minimum reading, switching
the
voltmeter
to
more sensitive ranges
as
required.
It
should
be
possible
to
obtain
a
reading below 0.03 volts
(40
dB down).
5.3.2.
OFFSET ADJUSTMENT
The internal trimpot R87 affects this adjustment.
It
should
only
be
necessary
to
change the factory setting
if ICs
are replaced.
The adjustment
is
correct when
the DC
voltage
at
both sides
of the
open position
(EQ in) of the EQ
switch
is
the same.
No "click" will
be
generated when
the EQ
switch
is
operated
if
this adjustment
is
correct
.
NOTE:
If
the
offset control
is
severely misad justed, large
voltage pulses are generated
in the
filter when
the EQ
switch
is
operated.
This could overload or damage unprotected
equipment which may be connected
to the
output
of the
Model
562.
UREI cannot be responsible for consequential
damages due
to
misad justment
of this
control.
PREFERRED METHOD
With
no input signal
applied, set
the EQ
switch
to the "IN"
position.
Measure
the DC
offset voltage
of IC
8
(orange wire
at the EQ
switch) and adjust R87 until the DC voltage at
the
red
wire
of the EQ
switch measures
the same
value.
The
range
of the
adjustment
is
approximately
±30 mV.
ALTERNATE METHOD
Connect
the
output terminals
of the
Model 562 to
a
high gain
amplifier and loudspeaker.
With
no input
signal applied
switch
the EQ IN and OUT.
Listen
to the
loudspeakers
and
adjust R87 for minimum
audible "click" while operating
the EQ switch.
5.4.
CLEANING
The front panel
of the 562
may
be
cleaned with
a
non-abrasive
cleanser such
as
"Formula
409" or
"Fantastic" applied with
a
soft
clean cloth.
Additional protection
of the
anodized panel
can be
afforded through
a
light application
of
a
spray wax preparation
such
as
"Pledge."
Never spray
the panel directly, as the cleanser
or wax
may adversely affect
the controls.
- 18 -
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