19
Jul. 2013
AC-40
3. Volume Check
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.
* Operation out of sequence is ignored.
1. GUITAR CHANNEL BASS
2. GUITAR CHANNEL MIDDLE
3. GUITAR CHANNEL TREBLE
4. GUITAR CHANNEL REVERB
5. MASTER
6. MIC/LINE CHANNEL REVERB
7. MIC/LINE CHANNEL TREBLE
8. MIC/LINE CHANNEL MIDDLE
9. MIC/LINE CHANNEL BASS
o: lights, *: flashes, -: goes off
The volume level of the speaker sound increases as the control is
operated toward the maximum position, and from the intermediate
position, the pitch rises.
When all volume testing has been completed, the
POWER
LED flashes
slowly.
Switch off the power.
This ends the Test Mode.
Input/Output Level Test
(for Reference)
Items Required
• Level meter
• Signal generator
• Dummy load resistor tool
- 4
Ω
load resistor
- 1/4-inch phone plug with 47 k
Ω
load resister
- Stereo miniature phone plug with 100
Ω
load resistor
Procedure
1.
Switch on the power and start the unit in the normal usage state.
2.
Make the following settings on the main unit.
Speaker Output Verification
1.
Connect a 4
Ω
load resistor to the speaker lines.
2.
Connect the signal generator to the
MIC/LINE CHANNEL INPUT
jack and
input the following signal.
1-kHz sine wave at -43.0 dBm
3.
Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
4.
Connect the signal generator to the
AUX IN STEREO
jack and input the
following signal to the L channel.
1-kHz sine wave at -30.8 dBm
5.
Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
6.
Input the following signal to the R channel of the
AUX IN STEREO
jack.
1-kHz sine wave at -30.8 dBm
7.
Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
8.
Connect the signal generator to the
GUITAR CHANNEL INPUT
jack and
input the following signal.
1-kHz sine wave at -19.2 dBm
9.
Verify that signals like the following are output from the speaker lines.
SP OUT L: +19.0±1.5 dBm
SP OUT R: +19.0±1.5 dBm
LINE OUT Verification
1.
Connect a 1/4-inch phone plug with a 47-k
Ω
load resistor to the
LINE
OUT L/MONO
and
R
jacks.
2.
Connect the signal generator to the
GUITAR CHANNEL INPUT
jack and
input the following signal.
1-kHz sine wave at -3.6 dBm
3.
Verify that signals like the following are output from the
LINE OUT L
and
R
jacks.
LINE OUT L: +3.0±1.5 dBm
LINE OUT R: +3.0±1.5 dBm
Headphones Output Verification
1.
Connect a stereo miniature phone plug with a 100
Ω
load resistor to the
PHONES
jack.
2.
Connect the signal generator to the
GUITAR CHANNEL INPUT
jack and
input the following signal.
1-kHz sine wave at -23.5 dBm
3.
Verify that signals like the following are output from the
PHONES
jack.
PHONES L:
+4.9±1.5 dBm
PHONES R:
+4.9±1.5 dBm
Control position
POWER LED
(Initial state)
*
0
-
Center
o
10
o
Controls and switches
Controls and switches position
GUITAR CHANNEL REVERB,
MIC/LINE CHANNEL REVERB
0
GUITAR CHANNEL BASS/
MIDDLE/TREBLE, MIC/LINE
CHANNEL BASS/MIDDLE/
TREBLE
Center
GUITAR CHANNEL VOLUME,
MIC/LINE CHANNEL VOLUME,
AUX LEVEL, MASTER
10
GUITAR CHANNEL CHORUS,
MIC/LINE CHANNEL CHORUS,
ANTI-FEEDBACK
OFF
Summary of Contents for AC-40
Page 4: ...4 Jul 2013 AC 40 Location of Controls fig panel eps 1 2 3 4 3 5 10 11 13 14 12 6 8 7 9 1...
Page 12: ...12 Jul 2013 AC 40 Plane View Fig A fig heimenA eps View A1 View A3 View A2 a a a...
Page 15: ...15 Jul 2013 AC 40...
Page 20: ...20 Jul 2013 AC 40 Wiring Diagram Block Diagram fig block eps L 1 2 8 9 10 11 12 7...
Page 22: ...22 Jul 2013 AC 40 Circuit Board Main Board fig b main1 eps...
Page 23: ...23 Jul 2013 AC 40 fig b main2 eps...
Page 30: ...30 Jul 2013 AC 40 Circuit Board GT Input Panel Jack Mic Input Board fig b panel eps...
