Roland Boss GT-10, Service Notes

19

Mar. 2008

GT-10

5.

Apply a load of 

25

 to 

40 kg

 to the expression pedal at the location in the 

figure below.

fig.exp-pedal-sw-e.eps

The expression pedal’s LED lights up.

This LED lights up only when the load to the expression pedal is over the 
value for 

Threshold

.

If it fails to light up, operate the dial to adjust the value for 

Threshold

.

(Initial value: 

6

, variable range: 

1

 through 

16

)

Smaller values make the expression pedal switch increasingly easier to 
actuate, and larger values make the switch progressively more difficult to 
actuate.

6.

Press the [WRITE] button.

7.

Verify that the message 

Done

 is displayed.

8.

Pressing the [EXIT] button returns the unit to the test-item selection 
screen.

* Executing a Factory Reset (

17. FACT RESET

 (p. 22)) in the Test Mode 

initializes the 

Threshold

 value just described (to a value of 

6

).

8. EXT EXP

Testing of the External Pedal Jack

1.

Use the dial to choose 

8: EXT EXP

.

2.

Pressing [CATEGORY/ENTER] displays the screen shown in the figure 
below.

fig.8extexp2.eps

* If no expression pedal is connected, the message 

Not Connected

 is displayed.

3.

Connect the EV-5 to the 

EXP PEDAL 2

 jack.

* Set the sensitivity control on the EV-5 to 

0

.

4.

Depress the heel of the EV-5 pedal all the way, and verify that 

MIN = OK

is displayed.

5.

Depress the toe of the EV-5 pedal all the way, and verify that 

MAX = OK

is displayed.

6.

When the message 

Pull out EXP PEDAL.

 appears, disconnect the plug 

for the EV-5.

If 

OK

 is displayed, execution automatically advances to the next test.

9. MIDI

MIDI Test

fig.9midi2.eps

* When no MIDI cable is connected, the message 

No Connection..

 is displayed.

1.

Connect the MIDI IN and MIDI OUT jacks using a MIDI cable.

2.

When the message 

Pull out the cable.

 appears, disconnect the plugs for 

the MIDI cable.

If 

OK

 is displayed, execution automatically advances to the next test.

10. AMP CTRL

Testing of the AMP CONTROL Jack

fig.10ampctrl2.eps

1.

Connect the dummy plug to the 

AMP CONTROL

 jack.

2.

Set the tester to the resistance-measurement mode, and touch the + and - 
probes respectively to the signal and ground connectors of the dummy 
plug.

3.

Verify that the readings on the tester match what is displayed on the LCD 
screen as shown below.

4.

Press [

] to advance to the next test.

11. USB&D.OUT

Testing of the USB Circuitry and DIGITAL OUT 
Circuitry

fig.11usbdout2.eps

After a short wait, the message 

No Connection..

 is displayed.

1.

Connect the left and right audio-output channels of the device capable of 
digital input to the monitor speakers and the oscilloscope.

2.

Using a digital audio cable, connect the 

DIGITAL OUT

 jack on the GT-10 

to the DIGITAL IN jack on the device capable of digital input.

3.

On the computer, start the dedicated USB checking software for the GT-
10 (USBCheck.exe).

4.

Using a USB cable, connect the computer and the USB connector on the 
GT-10.

The message 

CHECK SOUND

 is displayed on the GT-10’s screen.

The message 

VENDER

 is displayed in the USB checking software on the 

computer.

* If the message 

No Connection..

 does not disappear, a problem is present in the 

computer’s settings, the USB connection, or the USB circuitry in the GT-10.

LCD screen display

Tester

OPEN

Infinite resistance

SHORT

Around 0 ohm