Yamaha tx7 Service Manual page 15

TX7
TEST
PROGRAM
1
.
Entering the test
program
By turning the power on while pressing
the following two
switches,
you
will
enter the
test
program.
When
this appears,
you
may
release the switches.
While
pressing,
turn
the
power
switch
ON.
«
YRftRHfl
TX7
»
When
this
is
displayed,
continue pressing
TEST y/n
?
Software version
number
3. Details
of each
test
program
1)
RAM
read
•
write/ROM read/backup battery voltage
tes t
When
you enter the
test
program and
press
|
YES
+1
1 ,
these tests will
be
carried
out automatically.
0 RAM
read
•
write
test
This
carries
out read
•
write tests
on
certain
bytes of
RAM
1
~
4.
Since not
all
bytes are tested, the
32
voice
data,
32
TX
function data,
32
DX
function data, voice
and
edit
buffer data
will
be preserved unchanged.
(Since only part of
RAM
is
tested,
it
does not guarantee
100% accuracy.)
(Test result)
If
everything
is
OK,
it
will
move
to the
ROM
read test
without displaying anything.
[If
there
is
an
error]
|~£RROR
RAM
1——JH3
will
be
displayed,
and you
will
not
RAM number be ab!e t0
Proceed to the next
1
test.
2.
Executing
the test
program .... The
tests will
be
carried out
in
the order described below. However, you
may
not return to
a
previous
test.
1)
When
y
ou respond
to
"TEST
y/n?" by
pressing
I
YES
+1
L
the following
tests will
be
carried out.
RAM
read/write
test
ROM
read
test
Backup battery voltage
test
2)
TEST
1
.
.
. .
When
you respond to the bat tery voltage
display
by
pressing
I
YES
+1 L
it will
pro-
ceed to the next
test.
(You may
skip this
test.)
Pitch,
volume and volume change
test.
3)
TEST
2
. . . .
When TE ST
1 is
over (or
you
press
l
YES
+1
1
),
it
will
proceed automatically
to
the next
test
.
LCD
flash test.
4)
TEST
3
. . . .
When TE ST
2
is
over
and you
press
iY£S
+1
j ,
it
will proceed to the next
test.
(This
-test
cannot be skipped.)
Panel switch
test.
5)
TEST
4
. . . .
When T EST
3
is
over
and you
press
YES
+1
1
,
it
will
proceed
to the
next
test.
However, you must make
the proper
set-
tings
and connections
for this test before
entering
it.
Otherwise, an
error will result.
(After the display has indicated
error,
you
may
proceed
to
the next
test.)
Cassette interface test.
6)
TEST
5
. . . .
When TE ST
4
is
over (or
you
press
t
YES
+1
j
),
it
will automatically proceed
to
the next
test.
However
unless
you
make
the proper
connections
and
settings
before entering
this
test,
you
will not be
able to
proceed
to the next
test.
MIDI
IN/OUT
test.
7)
TEST
6
. . . .
When TE ST
5
is
over
and you
press
YES
+1
)
,
it
will
proceed
to the next
test.
MIDI
THRU
circuitry test.
When
the
above
tests
have been completed, the display
will
show
1
TEST
END!
1
and
the
TX7
will return to normal
operating mode.
0
ROM
read test
If
the
RAM
read
•
write
test
was OK,
this test will be
carried
out automatically.
It
reads the entire
program
ROM
area (except for the check
sum
data)
and
does
a
check sum, which
it
then
compares
with the
check sum
written
in
ROM.
(The
check sum
process adds the contents of
ROM
and comes up
with a
number which
it
compares
to
a stored
known
correct
number.
[Test
result]
If
everything
is
OK,
it
will
move
to the backup
battery
voltage test
without displaying anything.
[If there
is
an
error]
1
ROM
TEST
ERROR
[
will
be displayed, and you
will
not
be able to proceed to the next
test.
0
Backup battery voltage test
If
the
ROM
read
test
was OK,
this test will
be carried
out automatically.
It
checks the
backup
battery voltage
and displays the voltage
in
the
LCD.
[Test result]
The backup
battery voltage will
be displayed
in
the
LCD
as
follows.
If
the voltage
is
below 2.3V, there
is a
possibility
that the
memory
will
not be backed up, so please change
the battery.
|
BATTERY VOLT
|
Voltage' display
To proceed
to the
next
test, press
[There
is
no
error display.]
fYES +1~|
.
2)
TEST
1
Audio output pitch and volume,
volume check
1
TEST
1
PUSH
VOL
<
>
1
will
be displayed, and
a
sine
wave
440Hz
±
0.1Hz
will be sent to the
output and head-
phone
jacks.
When
this test
is
entered, the
volume
will be at
maximum,
.... about 250
mV
at
the output jack.
When you
press
the
DO
switch, the upper dark
section of the
LCD
will shri
nk
and the volume
will
go
down. When you
press the
I
»
1
switch, the upper dark section of the
LCD
will
grow, and
the volume
will
go up.
[Test result]
Whether
or
not
th e test
wa
s
OK, you may proceed
to
TEST
2 by pressing
f
YES
+1
I .
[If
there
is
an
error]
The
problem
is
probably
in the
FM
tone
generator,
DAC,
sample and hold,
VCA
control, or
in
the analog circuitry.
3)
TEST
2
LCD
flash test
All dots of the
LCD
will flash
on and
off.
[Test
result]
.
When
it
is
OK, you may
proceed to
TEST
3 pressing
F
YES
+1
I .
[There
is
no
display.]
4)
TEST
3
Pare! switch
test
[TEST
3
NOW
SW.,
?]
will be displayed.
When you
press
the
left
switch
(
TlOW
i
switch), the switch n
umber
will
be
displayed
like this;
{TEST
3
NOW
SW.
HI
.
Continue
pressing switches
from
left
to right and each switch number
will
be
displayed.
[Test
result]
If all
switches
are
OK,
1
PANEL SWITCH OK
I
will
be
dis-
played.
To
continue
to
TEST
4,
press
I
YES +
71
.
rNOTE:
—
Before you
press
fYES
+1
[
to go to the next
test,
make
the
connections
for
TEST
4.
If
you
proce ed without making
the connections,
|
CASSETTE ERROR
1
will be displayed.
[If
there
is
an error]
There
is
no
error display, but
you
will
not be able to pro-
ceed
to
the next
test.
5)
TEST
4
Cassette interface
test
When you
finish
TEST
3 and
fPAN EL SWITCH OK
1
is
dis-
played,
m
ake the connections
as
shown below
and
press
j
YES
->-1
1
.
The
cassette interface
test will
be carried out
automatically.
'Use an 10
dB
amplifier or
set a cassette
deck
to
REC/PAUSE and
adjust
it
so that there
is
10 dB
gatn.
[Test result]
If
everything
is
OK. fCASSETTE OK!
]
will
be dispalyed,
and you may
proceed to
TEST
5 by pressing
[YES
+1
j .
r
N0TE:
;
—
Before
pressing
f
YES
+1~] and
advancing to
TEST
5,
make
the connections
for
TEST
5. If
you
pr oceed to
TEST
5
without doing
this, the display will read
[CONNECT
MIDI
I70~l.
[If there
is
an error]
If
you
did not
make
the connections,
if
the connections
were
incorrect,
if
gain
was
insufficient, or
if
th ere
is a
hard-
ware mal function,
the display will read
fCASSETTE
ERROR
1
.
If
this
happens, turn
off the
power, recheck
connecti ons and
gain, enter test
mode
and
try again.
Even
if
I
CASSETTE ERROR"]
is
dis played,
you
may
pro-
ceed
to
TEST
5 by
pressing
|YE$~+r)
.
—28—
6)
TEST
5 MIDI IN/OUT
test
When
you
finish
TEST
4
and
I
CASSETTE OK!
i
or
"CAS^
SE T TE
ERROR
j
1
;
VdiT
played, connect
the
MIDI
terminals
as
shown below and
press
[
YES
+1
j
.
The MIDI
interface
IN/OUT
will auto-
matically be
tested.
[Test result]
If
everything
is
OK,
|
MIDI TEST
OK!~]
will
be
display ed.
You may
then proceed to
TEST
6 by pressing fYES+l
1 .
NOTE:
—
When
you press
f
YES
+1
1
,
TEST
6
will automatically
begin,
so
before proceeding, make
the connections for
TEST
6.
[If
there
is
an error]
If
you
did not
make
the connec tions or
if
the connecton
is
faulty,
j
CONNECT
MIDI
I/O
[
will
be
displayed,
and you
will not be able to proceed
to the
next
test, so
make
the
correct connections.
If
there
is a
hardware
e rror in the
MIDI IN/OUT
interface,
[MIDI TEST ERRO~Rl
will
be
displayed,
and you
will not
be able to proceed to
TEST
6. Please
check
the hardware.
7)
TEST 6 MIDI
THRU
circuitry test
When
you
ha ve
made
connections
as
shown
below,
the
LCD
will display
|
LISTEN EXT. TX7!
1
and the tone
generator
will produce sound. In this way, you can check
the
MIDI
THRU
hardware.
You may
use any MID!
instrument
as a tone generator.
For example TX7, DX7,
etc.
[Test
result]
If
everything
is
OK,
the following
MIDI
data will be sent
from MI
DI
THRU. When
all
the data has
been
sent,
iTEST
END!!
)
will
be displayed and the
TX7
will
return to
normal operating
mode
(combined mode).
Output
data (Hexadecimal)
"O" symbol
indicates time gap.
Other tone
generator
MIDI IN
LJ
p,
I
V
VI
Q.
% thru
rx7
0
0
90, 45,
7F,
45, 00, 51,
7F,
51, 00,
ON*
<«vOFF
~
Shannon,.** KiyOFf
K«y ON
90, 45, 00, 41, 7
t
F, 51, 00, 45,
7F,
A4 Key
2F
f AS <•«
ON
^
K«y OFF A« K»y
ON
pO, 45, 00, 51,
7F,
51, 00, 45,
7F,
A4 K«y 0*
aWon
q
A5 K.y
OFF
A
4
Km ON
90, 45, 00, 51,
7F,
51, 00, 45,
7F,
45,
7F, BO,
40.
7F,°
A4 K»y
ON
Sur:*- ON
BO,
41, 00, 07,
7F,
Sum*
OF
F
Ps-emenro ON
___
BO,
41, 00, 07, 60,
W
Sustain
OF
F v
7
u-nf tutt-ng
BO,
07.
7F,
01,
7F
~
A4 Key OFF AS K*v
ON
^
A5 K»v
OFF
A4 *»y
ON
90, 45, 00,
51,
7F,
5
1 ,
00. 45, 7F,
A4
**»
OFF
^
AS K«y
ON A5
K»v
OFF A4 K«y ON
EO, 7E.
7F
90, 45. 00, 51,
7F,°51,
BO,
01,
00
00,
EO.
00, 40,
[If
there
is
an
error]
There
is
no error display.
If
you were
unable to ver fy data
transmission, check
MIDI
hardware.