Yamaha tx81z Service Manual page 28

TX81Z
TEST PROGRAM
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1
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Preparation
Instructions
[
1
>
Connect
the
MIDI
IN connector to the
MIDI
OUT
connector with
a
MIDI
cable.
{2}
Connect
the
CASSETTE
connector
to
the
10dB
amplifier with
a
DIN
cable.
*Use an
iQdB
amplifier or
set a cassette
deck
to
R
EC/PAUSE
and
adjust
It
so that there
is
IQdB
gain.
2.
Test
Program Entry
{11)
Starting
from
Test
1
While
pressing
and.
holding the
MASTER
VOLUME
and
CURSOR
switches, turn
on the
POWER
switch.
The LCD
will display
a
message
as
shown
below.
I
p.liT
Test Entry
?
Press the
INC
switch,
and
the preset
voice data
is
loaded
into
the
RAM
and
the
MIDI
parameters
are set as
shown
in
the chart
below.
Ch,
Info:
Basic Rev, Ch.:
Transmit
Ch.:
Sys. Info:
ON
all
{OMNI ON)
1
ON
(2)
Starting
from Test 5
While
pressing
and holding the
MASTER
VOLUME
and switches, turn
on
the
POWER
switch.
The Test routine will start
from
the Test
Program
5.
3,
Test Program
1:
Output check
M
)
The
LCD
will
display the message
shown
below.
Check LVL
I
(L)
An
output
signal
of
-19
±
2dRm
at
440 Hz {A3
note)
can be detected
at
the
OUTPUT
I
(L)
connector,
if
the
INC
switch
is
pressed, the Test
Program
will
proceed to
the next
step.
(2)
The LCD
Will
display the
message
shown
below.
Check LVL 2
(R)
I
An
output
signal
of
—19
*
2dBm
at
440Hz
I
A3
note)
can be detected
at
the
OUTPUT
11
{R)
connector.
If
the
INC
switch
is
pressed, the Test
Program
will
proceed to the next
step.
(3)
The
LCD
will
display the
message
shown
below.
Check LVL HP
(L)
An
output
signal
of
—13
±
2dBm
at
44GHz
<A3
notE) can be detected
at the Lch, of the
HEAD-
PHONES
connector.
If
the
INC
switch
is
pressed,
the Test
Program
will
proceed
to the
next
step.
(4)
The LCD
will
display the
message shown
below.
Check LVL HP
(R)
An
output
signal
of
-13
t
2dBm
at
440Hz (A3
note)
can be detected
at
the
ftch.
of the
HEAD-
PHONES
connector.
If
the
INC
switch
is
pressed,
the
Test
Program
will
proceed
to the next
routine.
4.
Test
Program
2t
RAM
check,
CASSETTE
l/F
check
and MIDI
I/O check.
(1)
When
this test
is
initiated,
the
RAM
check,
CASSETTE
l/F
check and the
MIDI
I/O
check
are
performed automatically.
If
an
error
is
detected, the Test
Program
will
stop
at
that
step.
If
the
CASSETTE
l/F
check
is
in
error, pressing
the
DEC
switch
will
advance
the Test Program
to
the
next
step.
{2)
The
LCD
will
display the message
shown
below.
•
Check MIDI THRU
The
MSX
monitor and
the
program
for
the
MIDI
THRU
connector and check on the
MSX
monitor
for
continuous output
of the
test
data
(AA, FF,
00,
55}
from
the
MIDI
THRU
connector.
If
the
INC
switch
is
pressed,
the Test Program
will
advance to the next
routine.
'MIDI
THRU
check
Connect
the
MSX
monitor
to the
MIDI
THRU
connector and check on
the
MSX
monitor
for
continuous output
of the
test
data
(
AA,
FF,
00,
66)
from the MIDI
THRU
connector,
If
the
INC
switch
is
pressed, the Test
Program
will
advance
to the
next
routine.
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