Boss GT-1 Service Notes page 18

Sep. 2016
4. JACK SW
This verifies the sensing operation of jacks.
1.
Connect the 1/4-inch stereo phone plug to the CTL2,3/EXP2 jack and the
miniature stereo phone plug to the PHONES jack.
2.
In the TEST MENU, select 4. JACK SW and press ENTER.
A screen like the one shown below is displayed.
[CTL] EJECT
[PHONES] EJECT
3.
Disconnect the plug from the CTL2,3/EXP2 jack.
A screen like the one shown below is displayed.
[CTL] INSERT
[PHONES] EJECT
4.
Connect the plug to the CTL2,3/EXP2 jack again.
A screen like the one shown below is displayed.
[CTL] OK
[PHONES] EJECT
5.
Disconnect the plug from the PHONES jack.
A screen like the one shown below is displayed.
[CTL] OK
[PHONES] INSERT
6.
Connect the plug to the PHONES jack again.
A screen like the one shown below is displayed.
[CTL] OK
[PHONES] OK
7.
Detach the both plugs.
8.
Press EXIT to return to the TEST MENU.
5. SW/LED
This verifies the switch operation.
1.
In the TEST MENU, select 5. SW/LED and press ENTER.
LEDs of , , CTL1 and from FX1/COMP to REVERB light up red.
A screen like the one shown below is displayed.
fig.test-5.eps
2.
Press .
The LED lights up blue.
3.
Press .
The LED goes off.
4.
In the same way, press respectively
5.
Press the button displayed on the screen in sequence.
6.
After pressing buttons until MENU, press EXIT to return to the TEST
MENU.
6. LCD/ENCODER (DEV)
This item is not required at the service.
18
and CTL1 twice.
7. LCD/ENCODER
This verifies the display of the LCD screen.
1.
In the TEST MENU, select 7. LCD/ENCODER and press ENTER.
fig.test-7-1.eps
2.
Slowly turn the knob 1 clockwise.
The value displayed on the screen increases by one unit at a time and the
contrast grows darker.
* If the knob is turned in the opposite direction or the wrong knob is turned, a
black band appears at the bottom area of the screen. In this case, turn the knob 1
clockwise and continue to the test.
3.
When the value displayed on the screen reaches 24, turn the knob
counterclockwise slowly.
The value displayed on the screen decreases by one unit at a time and the
contrast grows fainter.
When the value displayed on the screen reaches 1, and the knob is turned
counterclockwise further, a screen like the one shown below is displayed.
fig.test-7-2.eps
4.
Slowly turn the knob 2 clockwise.
The value displayed on the screen increases by one unit at a time and the
display of the bar advances to the right.
5.
When the value displayed on the screen reaches 24, turn the knob
counterclockwise slowly.
The value displayed on the screen decreases by one unit at a time and the
display of the bar advances to the right further.
When the value displayed on the screen reaches 1, and the knob is turned
counterclockwise further, a screen like the one shown below is displayed.
fig.test-7-3.eps
6.
Test the knob 3 in the same way.
When the value displayed on the screen reaches 1, and the knob is turned
counterclockwise further, a screen like the one shown below is displayed.
fig.test-7-4.eps
7.
Verify that the black frame around the screen have no missing dots, then
press ENTER.
A screen like the one shown below is displayed.
fig.test-7-5.eps
8.
Press EXIT to return to the TEST MENU.
GT-1