Boss GT-100 Service Notes page 17

Mar. 2012
3. LCD
A screen for adjusting the backlight brightness appears on the left and
right LCD screens.
fig.lcd-backlight.eps
1.
Compare the brightness levels on the left and right, and adjust the
brighter screen to match the darker screen.
To make the screen on the left darker, turn knob 1. To make the screen on
the right darker, turn knob 5.
* Only one screen can be adjusted at a time. Adjustment cannot be made by
operating both the left and right controls.
2.
Press WRITE.
A screen for adjusting the contrast appears on the left and right LCD
screens.
fig.lcd-contrast.eps
3.
Compare the brightness and contrast on the left and right, and adjust the
brighter screen to match the darker screen.
To make the screen on the left darker, turn knob 1. To make the screen on
the right darker, turn knob 5.
* Only one screen can be adjusted at a time. Adjustment cannot be made by
operating both the left and right controls.
4.
Press WRITE.
A prompt screen for verifying the contrast control appears on the left and
right LCD screens.
fig.lcd-contrast-2.eps
5.
Turn knob 1 to vary the on-screen value from 1 to 16, and verify that the
contrast changes.
If there is a difference in contrast on the left and right, redo the settings
from step 1.
6.
Press PAGE .
7.
Verify that all on-screen dots have become darker.
fig.lcd-nondot.eps
8.
Press PAGE .
9.
Verify that all on-screen dots have become brighter.
fig.lcd-dot.eps
10. Press PAGE
.
11. Verify that only the outermost periphery of the screen has become
brighter.
fig.lcd-outline.eps
12. Press PAGE
.
Execution advances to the next test item.
4. SWITCH
1.
Press the pedal or button displayed on the screen.
Pressing a LED-equipped pedal makes the LED go dark.
Pressing PAGE makes the EXP PEDAL SW ON/OFF LED go dark.
When testing from BANK DOWN to SYSTEM has finished, execution
automatically advances to the next test item.
5. 360 VR
1.
Verify that turning knob 1 clockwise makes the value increase, and that
OK is displayed when the control has been turned all the way.
2.
Test knobs 2 through 8 in the same way.
When OK is displayed for all knobs, execution automatically advances to
the next test item.
6. OUTPUT VR
1.
Verify that the message MIN: OK is displayed. If it is not displayed, turn
the control all the way counterclockwise, and verify that OK is displayed.
2.
Slowly turn the OUTPUT LEVEL control clockwise.
When the maximum value (MAX) is detected, execution automatically
advances to the next test item.
7. INTERNAL EXP
1.
Depress the heel of the unit's expression pedal and press WRITE.
The minimum value offset is saved, and OK appears on the screen on the
right.
2.
In the same way, depress the toe and press WRITE.
The maximum value offset is saved, and OK appears on the screen on the
right.
3.
Forcefully depress the toe.
The EXP PEDAL SW ON/OFF LED lights up.
4.
Forcefully depress the toe again.
The EXP PEDAL SW ON/OFF LED goes dark, and execution
automatically advances to the next test item.
GT-100
17