Block Diagram - Roland GP-100 Service Notes

BLOCK DIAGRAM/7
y
7
HI
GP-100
Jun, 1995
TEST MODE/xT.
h
^
-
K
Entering test
mode
While depressing
[PREAMP][WRITE]
key, turn on power.
Confirm the
program
version.
The message shows
that
the
PRAM
of
ESP (DSP
chip)
is
being
tested.
When
the test
is
successful, the program proceeds
to
the
test
mode. Otherwise,
it
shows
the error
message shown
below.
"PRAM
Verify
Err!":
Check soldered
joints
connecting the
ESP
chip
to
the
CPU.
Select the desired test
by
turning
[PARAMETER]
and then
press
[NUMBERA/ALUE].
1.
LCD/LED
All
segments on
the
LCD
and the 8
LEDs
turn on.
Press
[NUMBER/VALUE] and
the 8
LEDs
turn
on one by
one
in
the order shown below.
(PREAMP-GLOBAL— TUNER-UTILITY^EFFECT—
METER— CLIP-SIGNAL-PREAMP-...)
Press
[PARAMETER]
to
proceed
to
the next
test.
2.LCD Contrast
Press
[NUMBER/VALUE] and
verify
change
in
LCD
contrast.
Press [PARAMETER]
to
proceed
to
the next
test.
3.
PREAMP
Knobs
Press
[NUMBERA/ALUE]
and the
name
of
PREAMP
knob
is
displayed
at
the upper
line
of the
LCD.
Position
[VOLUME]
at the
midway
of
its
travel
range,
turn
it
fully
clockwise and then
fully
counterclockwise.
The
display
will
change
to [**].
[PREAMP] [WRITE] L
^ Ltto
/S'— >>' 3
^:^pF(i|*lf|^AESP(DSPf- 7 7°)(/)PRAMf-a^ 7 7
oT
"PRAM
Verify Err!":
ESP
A
-y
A-cpursI
HE
L
r
T
$
V
^
o
1 1r\
[PARAMETER] A
M
t L
/i
@ ^
1"o
t
^[NUMBER/VALUEJ^ffAt
A
tto
1
.
LCD/LED
LCD^-bA7
7
h
^80CALED7)s*iTo
[NUMBER/VALUE]
S'O (DLED-^VU>Xj^:^l
A
^
*9
jILt Ao
(PREAMP—GLOBAL—TUNER—UTILITY—EFFECT—
METER—
CLIP— SIGNAL—
PREAMP—
...)
[PARAMETER]
A# A
t t to
2.
LCD
Contrast
[NUMBER/VALUE]
^#1"
t
.
ECE>(D
U
'y V
y
7. Y
h^t^muLtto
[PARAMETER] A
If
A
^ t to
3.
PREAMP
Knobs
[NUMBER/VALUE]
^Wtt.
LCD±lx i^PREAMPO tX<D
At
Ao
t
-f
[VOLUMEJO t
X^>X<^M^XW}tLX,
^^:()^'"[**]"
^t^muLtto
tX
(ArHlm)
— ^
(mAiil) (mAffi)
4