Roland GP-16 Service Manual

Jan,
1990
Press
[FUNCTION
A]
key.
[FUNCTION
A]
5.
D/A
Convertor
check
NOTE
When
GP-16
is
used
in
monaural.
Outputs
A
and
B
have
two
waveforms
mixed.
Therefore,
always
insert
an
emptyplug
into
A or
B to
observe
the
wave
shapes.
OOutput
triangle-wave (1kHz,
28Vp-p±2V) at OUTPUT
jack.
Turn the
a
-Dial to set the out
level-20.
OOutput
triangle-wave
(1kHz,
2.8Vp-p±0.5V)
at
OUTPUT
jack.
6. A/D
Convertor
check
NOTE
When GP-16 is used in
monaural. Outputs A and B
have
two
waveforms mixed.
Therefore, always
insert an
emptyplug into A or B
to
observe the wave shapes.
Press [FUNCTION
A]
key.
[FUNCTION
A]
O
Error
Display
Surmisable
cause
BUS BIT
*
*
error
•
Error in
D-RAM
(For
using
DSP :
IC19)
DATA
BUS bit
No.
**.
(*
*:
BDR
0 to
23)
(D-RAM Error
can't
be checked
in
this
case,
but only
DATA
BUS.
)
•
D
RAM
(
IC
1
9
)
(BDR
0 -BDR23
)
CD
* * kf -y
b
/0<Df-x
-y 7I±,
yU(;^LT\
D
RAM
UlTlif
x
-y
)
•
IC
*
*
Error
NOTE
Mask
ROM's
Ver.
No.
1.02-up
v
7,
2
ROMO
Ver.
No.
1.02
M
•
Error
in
D-RAM
IC*
*
(*
*:
21
to
26)
•
D RAM
IC*
*
(*
*:
21
to
26)
5
.
D/A
fx'y/
GP-16
(T)
OUTPUT A, B
(i
MONO *C
it^th
t. A, B
t
5
A
'>
v
?i~
h tz
,
rfeB
t
^ i>
o
—
OOUTPUT
y
tfrb, H
1kHz,
28Vp-p±
2V^
?
{±1
JjZtlZ
o
°
-9
T
L"C,
out
level
<D^20l,Zt
h
OOUTPUT
=
Mtfe.
1kHz,
2.8Vp-p±0.5V
tB
X
$
ti
h
o
6 . A/D
T-j-v?
GP-16
CD
OUTPUT
A, B
fi
MONO
X'itFBth
t. A, B
£
5
XXhtz^b,
1®
t
§
M'-r &
o
-at;
1
K
tm
GP-1B
©Check
1
a)
Input a
square wave
(200Hz, 140mV)
into front
input
jack and then
turn the
INPUT
LEVEL fully
CW.
b)
Output the square
wave (200Hz,
1Vp-p±0.2V)
at
OUTPUT jack. Balanced outputs
are out of
square wave (200Hz,
3Vp-p±0.5V),
at the same
level, but out of phase
to
other.
©Check
2
a) Input
sine wave (1kHz, ±0dBm) to the front
INPUT jack.
b)
Turn INPUT LEVEL
to the
position
where
the
input
level indicator
"CLIP"
disappears.
(Position
will be
almost
at the center)
c) Output
sine
wave
(0dBm±2dB)
at
OUTPUT CHI
jack. Make
sure
that no
output
comes from
OUTPUT CH2 jack.
d) Change the
input
to
the
rear
INPUT jack.
e)
Same as c).
f) Press the [GROUP A/B] key to change to ch-2.
Ofx y 7
1
a)
INPUT
'»
y?K,
&Mt8L
200Hz
140mV
tX
XL,
INPUT LEVEL
o
liVl;[I]-fo
b) OUTPUT
'»
y
7^£g?FM200Hz
lVp-p±0.2V
Zh
0
XLRCDtfBA li,
IF'C,
200Hz
3Vp-p±0.5V
bf£h
0
Ofx-^
2
a)
7
D
V
h
INPUT
v
V
y
7
K, lE^/S
lkHz
+
OdBm
b)
U^;F7
-
7
-CD
CLIP
if,
MAI)
X
0
K INPUT
LEVEL 'DtXtXXXlho
(Oj
ACDjf^fili,
ii(3rg*i;
<
ho)
c)
OUTPUT ch-1
Xh,
lE^/lfc
OdBm ± 2dB75
?
tB
A
£
tlho
hcom,
ch-2 Xhlt,
nthhto
d)
INPUT
$
'JTlZtho
e) c)
t [F]H
f)
[GROUP A/B]
LA
ch-2 \ZXh
0
Thru
Chei
g)
Input sine
wave (1kHz,
OdBm)
to the front INPUT
jack.
h) Turn
INPUT LEVEL
to the
position
where the
input
level indicator
"CLIP"
disappears.
(Position
will
be almost
at the center)
i)
Output sine
wave (0dBm±2dB)
at OUTPUT
CH2
jack.
Make sure that
no
output come
from
OUTPUT
CHI
jack.
j)
Change
the input to
the rear INPUT
jack.
k)
Same as
i).
l) Turn
the
cx
-Dial
to
set
to level-0.
m) Output
sine
wave below
—
85dBm at
OUTPUT
CH2 jack.
n) Turn the
a
-Dial to
set
level-100.
r, r/^nrM in a
fhru
^
Chec k
Press [GROUP
A/B] key
to set
to ch-1
Repeat
the
steps
from I)
to o).
[GROUP A/B]
fcflPLT,
ch-1 iZth
0
1)
Xb
o)
g
)
7D
>
h
INPUT
y
7
IZ,
lE&r&l kHz
±
OdBm
£XXth
0
h)
—
7—
0
CLIP
X,
A h
£
b
hZ
INPUT
LEVEL
oi
X&&t>-£h
0
im^xizth
o)
i)
OUTPUT
ch-2
Xb,
ZE&/&
OdBmi
2dB
/$*£BA $
tlho
21(7)0#,
ch-1
X
b
It,
tB
t)
Lftl'h
t
t't
hh
to
j)
INPUT
%'JTlZi-h
o
k)
0
twm
o
l)
LA,
out
level
<0]g£
0
\ZXh
0
m)
tB£D&*
JE^r^
—
85dBmJTT(C*^o
n)
LX,
out
level CD'fiS
h
=2
4
-
100
(;•
-fho
o) Output sine wave
(4dBm±2dB)
at
OUTPUT CH2 jack.
7. Gain
check
NOTE
When GP-16
is used
in
monaural.
Outputs
A and B
have two
waveforms
mixed.
Therefore,
always
insert an
emptyplug
into A
or B
to
observe the
wave
shapes.
0
&XX,
IE5£$UdBm±2dB
Press
[FUNCTION
A]
key.
[FUNCTION
A]
x 7 /
v±
GP-16
7) OUTPUT A,
B li
MONO
A'f'gffl
A
h t
,
A, B
£
5
4r
v
>
7“
A
h
iz
*6
,
v&ZL
£
tthtt
li&T
&
1-Xlz^
y°y
XtWA
i~ht
t
l
©Check 1
a) Input sine
wave (1kHz,
—
20dBm)
to
front
INPUT
jack.
b) Output sine
wave
(—
6dBm±2dB).
c) Press [GROUP
A/B] key.
0fx7/
1
a)
7D/[
INPUT v
V y ?
I
Z,
20dBm
4‘AAJ'T
h
0
b)
iEKM
-6dBm±2dB
c)
[GROUP A/B]
£#to
ZESiS
1
kHz
±
7

Roland GP-16 Specifications

General

Brand	Roland
Model	GP-16
Category	Music Pedal
Language	English