Akai S1100 Service Manual page 8

3-4-1.
DAC
OFF-SET
ADJUSTMENT
1)
After turning the unit on,
press
the
EDIT
SAMPLE
button.
Next use
the
DATA
knob
to
select "SINE," then press the
[REC
2]
F3/C
button.
Connect
the audio
signal
generator
to
the
LEFT
input
and sample a IKHz
sine wave. Adjust the
signal level
so
that
the output
is
-6dBm.
Select
"tim: s"
with the
CURSOR
knob, then
select "10.00" with the
DATA
knob. Next press the
[ARM] F8/H
button
to
sample
a
1
KHz
tone.
2)
Press the
EDIT
PROGRAM
button,
then press
the
[KGRP] F2/B
button.
Select
"change
number
of
KEYGROUPS"
with
the
CURSOR
knob, then
select "12" with the +/<
button.
Next
select "note
on sample
COHERENCE"
with the
CURSOR
knob and
select
"ON"
with the
DATA
knob.
3)
Press
the
[SLCT]
FI
/A
button,
then press the
[OUT] F4/D
button.
Next
select
"loudness"
with the
CURSOR
knob and
press
the
ENT/PLAY
button.
Set the
DATA
knob
so
that
the output from
OUTPUT
(L
CH,
R CH)
is
+
11
dBm.
Select
"eft
out" with the
CURSOR
knob,
and 14%
with
the
DATA
knob
only
when
adjusting the
send
level.
4)
Press the
ENT/PLAY
button
and
adjust the
VR101
(LEFT),
VR201
(RIGHT) and
VR301 (SEND)
on
the
AD PCB
so
that
DISTORTION
is
less
than 1%.
5)
Select
"mono
out" with the
CURSOR
knob.
Use
the
DATA
knob
to select
channels
between
CH1-CH8
and
adjust the
appropriate
VR
(refer to
following
list)
so
that the distortion of
each
channel
is
less
than
1
%.
On VOICE
1
PCB:
VR101
(CH
1)
VR201 (CH
2)
VR301
(CH
3)
VR401 (CH
4)
On VOICE
2
PCB:
VR101 (CH
5)
VR201 (CH
6)
VR301 (CH
7)
VR401 (CH
8)
3-4-2.
DAC MSB ADJUSTMENT
1)
Press
the
"MARK/#"
and "NAME"
buttons
at the
same
time then press the
"
~/\>
" button
to
set
the
default values.
Press the
EDIT
SAMPLE
button.
Next use
the
DATA
knob
to
select "SINE", then press the
[REC
2]
F3/C
button.
Con-
nect the audio
signal
generator
to the
LEFT
input
and sample a 100Hz
sine
wave.
Adjust the signal
level
so
that the
output
is
-20dBm.
Select
"tim: s"
with the
CURSOR
knob, then
select "10.00" with the
DATA
knob.
Next press
the
[ARM] F8/H
button
to
sample
a
100Hz
tone.
2)
Press
the
EDIT
PROGRAM
button,
then press the
[OUT] F4/D
button.
Select "loudness"
with the
CURSOR
knob and
press the
ENT/PLAY
button.
Set the output
to
-60dBm
with
the
DATA
knob.
3)
Adjust the
VR102
(LEFT),
VR202
(RIGHT),
VR302
(SEND) on
AD PCB
so
that the
waveform
becomes
a continuous
sine
wave
at
-60dBm
output
level.
INCORRECT
i
iCOmV
Ptr.
AA
CORRECT
Fig.
3-12
4)
Select
"mono
out" with
the
CURSOR
knob.
Use
the
DATA
knob
to
select channels
between
CH1-CH8
and
adjust the
appropriate
VR
(refer to following
list)
so
that
the
waveform
of
each channel
becomes
a continuous sine
wave
at
-60dBm
output
level.
On VOICE
1
PCB:
VR102
(CHI)
VR202
(CH2)
VR302
(CH3)
VR402
(CH4)
On VOICE
2 PCB:
VR102
(CH5)
VR202
(CH6)
VR302
(CH7)
VR402
(CH8)
SERVICE
MANUAL