Boss GT-1 Service Notes page 17

Sep. 2016
Test Items
1. VERSION (p. 17)
2. DEVICE (p. 17)
3. CURRENT (p. 17)
4. JACK SW (p. 18)
5. SW/LED (p. 18)
6. LCD/ENCODER (DEV) (p. 18)
7. LCD/ENCODER (p. 18)
8. INTERNAL EXP1 (CALIBRATION) (p. 19)
9. CTL (p. 19)
10. EXT EXP2 (p. 19)
11. AUDIO SELF (p. 19)
12. NOISE (p. 19)
13. AUDIO OUTPUT (p. 19)
14. AUDIO INPUT (p. 19)
15. FACTORY RESET (p. 20)
16. AD NOISE (p. 20)
* Test items 6, 11, 13, 15, and 16 are not required at the service.
Entering the Test Mode
1.
Connect the AC adaptor and hold down PREAMP, REVERB and
MEMORY EDIT and connect a 1/4-inch mono phone plug into the INPUT
jack.
* To execute 3. CURRENT (p. 17), connect the AC adaptor using the current-
consumption measurement tool.
* To execute 12. NOISE (p. 19), connect a 1/4-inch mono phone plug with 47 kΩ
load resistor to the INPUT jack. Other test items can be carried out by the
dummy plug.
2.
When the BOSS logo appears on the display, release your fingers.
Entering the Test Mode displays the TEST MENU.
fig.test-0.eps
Selecting Test Items
In the TEST MENU, turn the knob (1, 2 or 3; whatever possible) to select
a test item and press ENTER.
To return to the TEST MENU, press EXIT.
* It is impossible to return from 5. SW/LED to the TEST MENU until all
buttons have been pressed.
Quitting the Test Mode
Disconnect the plug from the INPUT jack to switch off the power.
1. VERSION
This verifies the version.
1.
In the TEST MENU, select 1. VERSION and press ENTER.
Version information is displayed under the VER text at the top left of the
screen.
* Ignore other displays.
2.
Press EXIT to return to the TEST MENU.
2. DEVICE
This verifies the operation of each device.
1.
Connect the computer to the USB COMPUTER connector.
2.
In the TEST MENU, select 2. DEVICE and press ENTER.
Each device is checked automatically, and if no problems are found, Pull
out the USB cable. appears.
fig.test-2.eps
3.
Disconnect the USB cable.
4.
Press EXIT to return to the TEST MENU.
3. CURRENT
This measures the current consumption.
1.
Use the current-consumption measurement tool to connect the AC
adaptor.
2.
Enter the Test Mode, select 3. CURRENT in the TEST MENU and press
ENTER.
3.
Verify that the current-consumption is from 165 to 195 mA.
4.
Press EXIT to return to the TEST MENU.
GT-1
17