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Feb. 2010
2. Switch Test
Carry out operations in the sequence shown below, and check the status of the corresponding LEDs.
No.
(Initial state)
1
Set MIC/LINE CHANNEL CHORUS to SPACE.
2
Set MIC/LINE CHANNEL CHORUS to WIDE.
3
Set GUITAR CHANNEL CHORUS to SPACE.
4
Set GUITAR CHANNEL CHORUS to WIDE.
5
Set ANTI-FEEDBACK to ON.
6
Press LOOPER STOP/CLEAR.
7
Press LOOPER REC/PLAY/OVERDUB.
↓
8
Disconnect the foot-switch plug from EFFECTS.
9
Insert the foot-switch plug into EFFECTS.
10
Depress the TIP (white) side of the foot switch.
11
Depress the RING (red) side of the foot switch.
12
Disconnect the foot-switch plug from EFFECTS.
13
Insert the foot-switch plug into LOOPER.
14
Depress the TIP (white) side of the foot switch.
15
Depress the RING (red) side of the foot switch.
16
Disconnect the foot-switch plug from LOOPER.
17
Insert the 1/4-inch stereo phone plug into PHONES.
18
Disconnect the 1/4 stereo phone plug from PHONES.
o: illuminated, -: dark, *: flashing
When the operations up through No. 18 have been completed, the POWER LED flashes.
Inserting the foot-switch plug into the EFFECTS jack and depressing TIP:CHORUS (white) makes execution advance to the next test.
3. Volume Test (1)
When the volume test starts, all LEDs light up.
Working in the sequence shown below, change the settings of the controls
from minimum to intermediate and to maximum and vice versa, and verify
that the LEDs light up and the speaker plays sound.
1. GUITAR CHANNEL BASS
2. GUITAR CHANNEL MIDDLE
3. GUITAR CHANNEL TREBLE
4. REVERB/AMBIENCE
5. MASTER
6. MIC/LINE CHANNEL TREBLE
7. MIC/LINE CHANNEL BASS
On detection of minimum value:
On detection of intermediate value:
On detection of maximum value:
The volume level of the speaker sound increases as the control is operated
toward the maximum position, and from the intermediate position on, the
pitch rises.
When all volume testing has been completed, all LEDs flash.
This concludes the testing.
Operation
The OVERDUB LED lights up.
The PLAY LED lights up.
The REC LED lights up.
REC LED
PLAY LED
-
-
o
o
o
o
o
-
-
-
o
o
o
o
o
-
*
*
-
-
o
o
o
o
o
-
-
-
o
o
o
o
o
-
-
-
o
o
-
-
4. Signal-level Test (for Reference)
After 3. Volume Test (1) has been completed, depress TIP:CHORUS (white)
to enter the Signal-level Test mode.
1.
When verifying speaker output, connect a 4Ω load resistor to the speaker
lines. When verifying headphones output, connect a 1/4-inch stereo
phone plug with 100Ω load resistors (x 2) to the PHONES jack.
2.
Connect a 1/4-inch phone plug with a 47 kΩ load resistor to the LINE
OUT jack.
3.
Connect a signal generator to the INPUT or AUX IN jack and input the
signal described below.
GUITAR CHANNEL INPUT:
MIC/LINE CHANNEL INPUT (balanced):
AUX IN L and R:
* 0 dBu = 0.775 Vrms
4.
Set the panel controls as shown below.
CHORUS:
ANTI-FEEDBACK:
GUITAR CHANNEL VOLUME:
MIC/LINE CHANNEL VOLUME:
AUX IN LEVEL:
Other controls:
5.
Verify the values at the measurement points shown in the Circuit
Diagram (Main Board: Analog) (p. 28).
The allowed range for measured values is ±1.5 dBu.
5. Volume Test (2)
1.
Reset the power and start the unit in the normal usage state.
2.
Input a signal to GUITAR CHANNEL INPUT, turn the GUITAR
CHANNEL VOLUME control, and verify that the volume level changes
normally and that no noise occurs.
3.
Carry out verification in the same way for MIC/LINE CHANNEL as well.
OVERDUB LED
POWER LED
-
o
o
o
-
o
-
o
-
o
o
o
-
o
-
o
*
*
-
o
o
o
-
o
-
o
-
o
o
o
-
o
-
o
-
o
o
o
-
*
-10 dBu, 1 kHz, sine wave
-42 dBu, 1 kHz, sine wave
(unbalanced): -36 dBu, 1 kHz, sine wave
-23 dBu, 1 kHz, sine wave
OFF
OFF
Maximum
Maximum
Maximum
Minimum
AC-33
19
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