dbx 363X - RMS Symmetry Testing; VCA Symmetry Testing; VCA Gain Testing

is on.
4.
Monitor
the
Channel
1
output
and
adjust
R18
for
unity
gain
+/-
0.3 dB
at
the
Channel
1
output
(
1
volt
rms
+/-
35
mV
).
5.
Repeat
for
Channel
2
using
R75.
E.
HOLD current
1.
Set
the
Channel
1 HOLD
control to
the
full counter-clockwise
position
(
"OFF"
).
2. Measure
the DC voltage
between
TP8
and
TP9.
3. Adjust
R47 for
365
mV
DC
+/-
5
mV.
4. Repeat for
Channel
2
using
TP12,
TP13,
and
R104.
F.
RELEASE current
1 .
Set
the
Channel
1
RELEASE
control
to
the
full counter-clockwise
position
(
*3k"
).
2.
Measure
the
DC voltage
between
TP
10
and
TP
11.
3.
Adjust
R53 for
33 mVDC
+M
mV.
4.
Repeat
for
Channel
2
using
TPM,
TP15,
and
R110.
G.
General operation
1.
Set all of the
front
panel
switches
to the
OUT
position.
2.
Connect a
1 kHz sine
wave
at
1
volt
rms to
the
Channel
1
input.
3.
Center
the
front panel
THRESHOLD
knobs.
4. Turn the
front
panel
HOLD and
RELEASE
knobs fully
clockwise.
5.
Verify
that
the
Channel
1
green
OPEN
LED is
on, the
Channel
2 red
RELEASE
LED
is
on, and
all
others
are
off.
6. Turn the
THRESHOLD
knob
fully
clockwise
and
verify that
the
green
OPEN LED turns
off, the yellow
HOLD
LED
turns
on
for
3
seconds
+/-
0.5 seconds,
and
then
the
red
RELEASE
LED
slowly
turns on
-
it should
take
2
to
3
seconds
to
reach
full
brightness.
7.
Monitor the
Channel
1 output and
verify
that
there
is no
signal
there.
8.
Press
the CHANNEL
1 BYPASS button
and
verify
that
the
signal
appears
at
the
Channel
1
output.
Return the
CHANNEL
1 BYPASS
button
to
the
OUT
position.
Recenter
the
Channel
1 THRESHOLD
knob.
7. Disconnect the input
and instead
connect
a
1 kHz sine
wave
at
1
volt
rms
to
the
Channel
1 KEY
input.
8.
Verify that
both red
RELEASE
LED’s are
on.
9.
Monitor the
Channel
1 output and verify
that there
is no
signal
there.