ARP 1601 Manual de serviço - Página 11

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SECTION
5
CALIBRATIONS
5.1
Sequencer
&
Quantizer
REF. NO.
TRIMMER.
TRIM
PROCEDURE
R19
FREQ. CAL.
1.
Put the
CLOCK FREQUENCY
SLIDER
fully
UP.
2.
Monitor
the
CLOCK OUTPUT
with
a
frequency counter
or oscilloscope.
3.
Put
all
other
sliders
fully
DOWN.
4.
Adjust
trimmer
R19
for
a
10 msec,
period
waveform
(100Hz.).
R26
PULSE
WIDTH
1.
Put
all
GATE ASSIGNMENT
switches
fully
UP
(Gate
Bus
1
position).
2.
Monitor
the
CLOCKED GATE
1
OUTPUT
with an
oscilloscope.
3.
Put the
GATE/TRIG
switch
in
the
TRIGGER
mode.
4,
Depress the
START/STOP
button
to
START
the sequencer.
5.
Put the
CLOCK FREQUENCY
slider fully
UP.
6.
Put
the
CLOCK
FM
slider fully
DOWN.
7.
Put
the
CLOCK
PULSE
WIDTH
slider fully
UP.
8.
Turn trimmer
R26
fully
CLOCKWISE.
9.
SLOWLY
turn
trimmer
R26
COUNTER
CLOCKWISE
until
waveform
disappears (constant
+14
volts).
TURN NO
FURTHER.
R206&
A OFFSET &
1.
Connect
a
patch cord
from
INPUT
A
jack to
INPUT
B
jack
(isolates
R207
B
OFFSET
ADJUST
quantizer
inputs).
2.
Adjust
trimmer
R206
for
volts
+.005
V
on
QUANTIZED A
OUTPUT.
3.
Adjust
trimmer
R207
for
volts
+.005
V
on
QUANTIZED
B
OUTPUT.
R226&
QUANTIZER
1
.
Put
all
sliders
on
the
sequencer
fully
DOWN.
R222
CV V/OCT
2.
Put the
TRIG/GATE
switch
in
the
GATE
mode.
®
3.
Put
the
sequencer
mode
switch
in
the
16
X
1
POSITION.
4.
Put
the
SEQ/RAND
switch
in
the
SEQUENTIAL
position.
5.
Depress the
RESET
button
(position
1
LED
should be
lit).
6.
Put
the
POSITION
1
SLIDER
fully
UP.
7.
Adjust
trimmer
R266
for
+2.00
volts
on
the
QUANTIZED OUTPUT A
jack.
8.
Adjust
trimmer
R222
for
+2.00
volts
on
the
QUANTIZED OUTPUT
B
jack.
R217
&
A
MOD
ADJUST
1
.
Put
all
the
sliders
on
the
sequencer
fully
DOWN.
R218
B
MOD
ADJUST
2,
Put
the
GATE/TRIG
switch
in
the
GATE
mode.
3.
Put
the
mode
switch
in
the
16
X
1
POSITION.
4.
Put the
SEQ/RAND
switch
in
the
SEQUENTIAL
position.
5.
Depress
the
RESET
button
(position
1
LED
should be
lit).
6.
Connect
a
patch cord
from
INPUT
A
jack to
INPUT
B
jack
(isolates
quantizer
inputs).
7.
Monitor
the
A SEQUENCER OUTPUT
with
a
DVM.
8.
Raise the
POSITION
1
SLIDER
to
1
/
2
.
9.
Measure and
record the
EXACT VOLTAGE
level
on
the
A
sequencer output
•
(should be near
+5
volts).
10.
Connect
a
patch cord
from
the
A SEQUENCER OUTPUT
jack to
the
CV
IN
jack.
11.
Monitor
the
QUANTIZER OUTPUT A
with
a
DVM.
12.
Adjust
trimmer
R217
for
EXACTLY
the
same
voltage
as
measured
in
step
9
(unity
gain).
13.
Monitor
the
QUANTIZED OUTPUT
B with
a
DVM.
14.
Adjust trimmer
R218
for
EXACTLY
the
same
voltage
as
measured
in
step
9
(unity
gain).
10