Roland GP-100 Service Notes page 6

*lf
the test
fails,
the following
message
will
appear.
"Verify
ERROR": Check
the MIDI cable
and
connections.
"IC35(2,3) short?":
Check IC35(pins 2 and
3)
"MIDI
IN
Noise?":
Check
IC35
and CPU, and
associated
wirings.
11.
OUTPUT A
D/A
Press
[NUMBER/VALUE]
to start
the
test.
Monitor the level of the
sawthooth wave on
[OUTPUT A
L(MONO)/R] socket. Verify the
level
change when
the
display
changes from "+4dB"
to
"-10dB".
*lf
you
test
L(MONO) and
R
sockets
one by
one, insert
an
open
plug into
R
socket
when
you
test
L(MONO)
socket.
Monitoring device:
OUTPUT VOLUME
:
MAX
Oscilloscope :0.1ms/DIV
2 V/DIV
"Verify
ERROR"
:
MIDI
^ "
7"
^
L
T
T
$
V
^
o
"IC35(2,3) short?":
IC35 (2,3E°7)
^ ^
7
LTT
$
"MIDI IN
Noise?":
IC35,
CPUtO^Bajt^t
1 1
.
OUTPUT A
D/A
[NUMBER/VALUE] t
^
^
^
1~
o
[OUTPUT A
L(MONO)/R]
V
V
'7
7
$
fl.
^^(7)"+4dB"/"-10dB'T2lS
UT
itt
-
7°-e5|fI
Lt-to
*L(MONO)v ^
7
7 h R'7
-y
7
7 ^
:?IJ
^ ^
L(MONO)
V
-y
7 7
^ ^
0#
tiR 7 7
(2
^
i
7°
7
J:-)
t2LTT$y^o
OUTPUT VOLUME:
:
MAX
Oscilloscope: :0.lms/DIV
2
V/DIV
Press
[PARAMETER]
to
proceed
to the next test.
[PARAMETER] t t
k
GP-100
Jun, 1995
12.
OUTPUT
B D/A
In
the similar
way
as
in
test 11, test
[OUTPUT
B
L(MONO)/R]
socket output.
13.
SEND D/A
In
the similar
way
as
in test 11, test
[SEND
1/2]
socket
output.
14.
INPUT
A/D
<Noise level>
Measure
the noise level on
[OUTPUT A
L(MONO)/R],
[OUTPUT B L(MONO)/R] and [SEND
1/2]
sockets under the
following conditions.
Test
condition:
INPUT VOLUME:
MAX
OUTPUT VOLUME: MAX
Input signal:
None
Acceptable:
OUTPUT
A, B:
L(MONO) = -74dBm
or below
R = -77dBm
or
below
*When
testing
L(MONO)
socket, insert
an open plug
into
the
R
socket.
SEND
1/2:
No
unusual
sound
should
be
heard.
<INPUT
sockets>
Check
the output
on
[OUTPUT A
L(MONO)/R]
(or
[OUTPUT
B
L(MONO)/R] and
[SEND
1/2])
sockets under the following
conditions.
*lf
you
test
L(MONO)
and
R
sockets
one
by one, insert
an
open
plug
into
R
socket
when you
test
L(MONO)
socket.
Test condition:
INPUT
VOLUME: MAX
OUTPUT VOLUME:
MAX
Input signal:
2kHz, 80mVp-p, square
Oscilloscope:
0. 1
ms/DI
V
2 V/DIV
12.
OUTPUTS
D/A
U.t ^ftTr[OUTPUT B L(MONO)/R]
V
T
7
7
13.
SEND
D/A
11.
t ^1^-r[SEND
l/2]v -y
7 7 L t
to
14.
INPUT A/D
<7
[OUTPUT A
L(MONO)/R],
[OUTPUT B
L(MONO)/R], [SEND
1/2]
v
V
7
7 7 T
X
^
Ltto
INPUT
VOLUME:
MAX
OUTPUT VOLUME:
MAX
Input
signal:
MATI
:
OUTPUT
A,B
:
L(MONO) -74dBm
Jif
T
R
-77dBmJ^:fT
*L(MONO)V
-y
7
7 V 7 7
12
^7°
7
kkmULX
<
SEND
1/2:
<INPUTv-y
7
7ltS>
Xtl U.
[output a
L(M0N0)/R]
y ^
{^[OUTPUT B L(MONO)/R], [SEND
1/2])
'X
V
7
7
CO
*L(MONO)
V
7 7 7 t R
X
7 7 7
^
^0
7- l2ltSt'
^
L(MONO) V 7
7
7^
^
0# 12
liR
X
7
7
7
12
^
§
X
7
12L-CT$V^0
INPUT VOLUME:
MAX
OUTPUT VOLUME:
MAX
Input signal:
2KHz^^]f^'/^
80mVp-p
Oscilloscope
:
O.lms/DIV
2
V/DIV
6