11
TU-3
Dec. 2009
3. OUTPUT Check
1.
Verify that the connections and signal input are as shown below.
INPUT
:
200 Hz, 1.0 Vp-p, rectangular wave
OUTPUT
:
Oscilloscope (channel 1)
BYPASS
:
Oscilloscope (channel 2)
Oscilloscope settings: 0.5 V/div., 1.0 ms/div., coupling DC
2.
Verify that the
CHECK
LED has gone dark.
fig.test-3-1.eps
3.
Verify that signals like the following are output.
OUTPUT
:
1.0+/-0.1 Vp-p
BYPASS
:
1.0+/-0.1 Vp-p
fig.test-3-2.eps
4.
Depress the pedal and verify that the
CHECK
LED lights up.
fig.test-3-3.eps
5.
Verify that signal output stops for
OUTPUT
only.
fig.test-3-4.eps
6.
Change the connections and signal input as shown below.
INPUT
:
1 kHz, 0 dBu, sine wave
OUTPUT
:
Noise meter (DIN audio)
BYPASS
:
N/A
7.
Verify that the noise-meter value (OUTPUT mute level) is
-90 dBu
or
less.
4. TUNER Operation Check
1.
Depress the pedal and verify that the
CHECK
LED lights up.
2.
Press the
MODE
button several times to make
CHROMATIC
light up.
3.
Connect audio output from the computer to the
INPUT
jack via the
attenuator tool.
4.
Play
1C0_JUST.WAV
on the computer.
A 16.352-Hz sine wave at -50 dBu is input to the
INPUT
jack.
5.
Verify that the center light of the LED meter lights up and
C
appears on
the seven-segment LED display.
fig.test-4-1.eps
6.
Play
2A4_JUST.WAV
on the computer.
A 440.00-Hz sine wave at -60 dBu is input to the
INPUT
jack.
7.
Verify that the center light of the LED meter lights up and
A
appears on
the seven-segment LED display.
fig.test-4-2.eps
8.
Play
3C8_just.WAV
on the computer.
A 4,186-Hz sine wave at -60 dBu is input to the
INPUT
jack.
