Roland Boss GT-10 Service Notes page 19

Mar. 2008
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.
LCD screen display
OPEN
SHORT
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.
GT-10
Tester
Infinite resistance
Around 0 ohm
19