Additional Tests - Boss GT-100 Service Notes

Mar. 2012
2.
Connect the miniature stereo phone plug equipped with 1-kΩ load
resistors to the AUX IN connector.
3.
Connect the amp-equipped monitor speakers to the OUTPUT L and
SEND connectors.
4.
Apply impact to the unit by allowing it to fall freely from a height of
about 5 cm. Verify that no abnormal noise occurs at this time.
GND LIFT Switch
1.
Connect dummy plugs to the SEND and RETURN connectors.
2.
Set the GND LIFT switch to LIFT.
3.
Using the tester, verify that the grounds of the SEND and RETURN
connectors are not shorted.
4.
Set GND LIFT to GND.
5.
Verify that the grounds of the SEND and RETURN connectors are
shorted.
6.
Press PAGE .
Execution advances to the next test item.
11. Factory Reset
1.
Press WRITE.
A screen like the one shown below is displayed.
fig.fact-2.eps
2.
Press WRITE again.
A screen like the one shown below appears and the factory reset starts.
fig.fact-3.eps
When the factory reset finishes, a screen like the one shown below
appears.
fig.fact-1.eps
3.
Press and hold POWER to turn off the power.

Additional Tests

This describes the procedure when measuring current consumption as
required, such as when the Main Board has been replaced.
Items Required
• AC adaptor (PSB-1U(S)) x 1
• Tester x 1
• DC IN current-consumption measurement cable x 1
fig.check-cable.eps
Verifying Current Consumption
1.
Connect the DC IN current-consumption measurement cable to the DC IN
connector on the GT-100, then connect the AC adaptor.
fig.connect-cable.eps
2.
Adjust the OUTPUT LEVEL knob to minimum.
3.
Hold down WRITE and PAGE
* Continue holding down WRITE and PAGE
100 appears.
After a short wait, the Test Mode starts.
4.
Turn knob 8 to display 2. LED on the screen.
5.
Verify that the LEDs (9) all light up, and that all dots in the LCD screens
are displayed.
6.
Verify that current consumption is 500 mA or lower.
GT-100
and press and hold POWER.
until the message BOSS GT-
21