Akai S1100 Service Manual page 7

3-3-2.
WAVEFORM MEMORY
TEST
1)
During the
HARDWARE
TEST
mode,
press the "F2/B"
button.
The
following display
will
appear on
the LC-display(refer
to Fig. 3-8).
2.
WAVEFORM MEMORY TEST
BANK
1
2
3
4
DAT
A
>1514131211109
8
7
65432
1
0
RESULT
testing
3
5
s e c
[1
cpu][2wav][3dac][4of
f][5adl][6adr][7adm)[boot]
Fig.
3-8
2)
After
35 seconds
the LC-display
will
show
the
message
as
shown
Fig.
3-9.
If
this
message
does
not
appear on
the
LC-
display,
it
means
a malfunction
in
the
waveform
memory
circuit.
Check
the
waveform
memory
circuit
and
LSI.
2.
WAVEFORM MEMORY
TEST
BANK
1
2
3
4
DATA>1
5141
31 21
11098765432
1
0
RESULT
OK
NO
CARD?
NO
CARD?
NO
CARD?
[1
cpu][2wav][3dac][4of f][5adl][6adr][7adm][boot]
Fig.
3-9
3-3-3.
ADC
OFF-SET
NULL CONFIRMATION
1)
During
the
HARDWARE
TEST
mode, press
the
"F5/E"
button.
The
following display
will
appear on the LC-display(refer
to Fig.
3-1
0).
5.
LEFT ADC OFFSET NULL
SET
MIN. REC.
LEVEL, LOW
GAIN,
SHORT INPUTS
ADJUST
LEFT INPUT OFFSET TRIM
TO
ZERO THE
OFFSET:-
0
i 1
1
+
1
t
[1
cpu][2wav][3dac][4of
f)[5adl][6adr][7adm][boot)
ARDWARE TEST
Fig.
3-10
2)
Next,
press the "F6/F"
button.
The
following display
will
appear on
the LC-display (refer to Fig.
3-1
1
).
1
HARDWARE
TEST|
6.
RIGHT ADC OFFSET NULL
SET
MIN. REC.
LEVEL, LOW
GAIN,
SHORT INPUTS
ADJUST RIGHT INPUT OFFSET TRIM
TO
ZERO
THE
OFFSET:-
0
I I 1
+
1
t
[1
cpu][2wav][3dac][4of
f][5adl][6adr][7adm][boot)
Fig.
3-1
•
Although the display
instruct to
adjust the
OFF-SET
TRIM,
this is
confirmation
only.
No
adjustment
is
necessary.
3-4.
DAC
OFF-SET
ADJUSTMENT
(PRECAUTIONS
BEFORE ADJUSTMENT)
•
For connection
of test
equipment
refer to Fig.
3-1
•
Set
the
MAIN
VOLUME
to
the
maximum
position.
•
Set
the
REC LEVEL
to
the
maximum
position
and
the
REC GAIN
switch
to
the "MID"
position.
•
Let the
unit
warm
up
for at least
5 minutes before proceeding with the following adjustments.
• Be
sure
to
connect the plugs
to
the
L
CH
and
R
CH
outputs,
otherwise
L-R mixed
output
will
be obtained from both
outputs.
SERVICE
MANUAL
7