Roland GP-16 - Troubleshooting and LCD Adjustment; Troubleshooting Power-On Display Errors; Error Messages and Causes; LCD Contrast Adjustment Procedure

Jan, 1990
GP-1B
TROUBLESHOOTING/
h
=7
v
a
-x
-f
Switch
power on.
(7-seg
LED Display)
Alii
ON
fl#
(7
iz
<7
LED
IItf)
Error
message
/-x^
—
Surmisable
cause
•
After turning on
the Power SW,
BANK and NUMBER
•
LCD
connector or circuit
is no good.
7-seg
LEDs alternately
flash
[8].
•«i(£ON
L
xmv\k,
si's?
t
?>/<-
W!SC8
•
LCD
<7)n*7
?
19
jg-t
13
ADJUSTMENT (For
LCD)/EISS1±«ULCD
ffl)
LCD contrast
adjustment.
LCD
(7)
=3
>
h77 h <7)1111
This
adjustment can be
done in the system mode
by
yXjA
•
-t
—
KO/^7 7
—
7
—
7
using
parameters. The
adjustment can also be done
T
from VR1
(Potentiometer) on Main
Board.
Adjustment procedure
1. While in
the normal mode, press the
[SYSTEM] key
1.
—
KC'/UT
•
-t
—
K)/^A, [SYSTEM]
4-
—
£
to enter the system
mode.
LX,
vX-rA
•
-t
—
K(Cliv^
0
2. In the
System mode, use [FUNCTION]
key to call up
2. yXtA
•
[FUNCTION]
^
—
the following parameter
I/tBLito
(have it appear in the
display).
12
.LCD
CONTRAST
CONTRAST-
VALUE:
0-100
3. Using the
[a
-Dial], display "CONTRAST
=
50".
3.
[
«
-Dial] Tr
CONTRAST
=
50
Llito
4. Using
Potentiometer (VR1: Refer
to the Fig.
1)
on
Main Board
adjust the display contrast
so that the
displayed
characters are
easy to
read.
4. 7
T >^(7)^HI^(VRl:Fig.
1
#BS)
£0
fC,
TV
Fig.
1
VR1
View from
component side