Verification Of Operation - Roland CUBE-15XL Service Notes

Sep. 2010

Verification of Operation

Items Required
• Signal generator
• Noise meter
Connections
For Verifying Speaker Output
Disconnect the speaker wires from the speaker, connect a 4-Ω load
resistor between the red and black wires, then connect the noise meter.
For Verifying Headphones Output
To the RECORDING OUT/PHONES jack, connect a headphones plug
that has one 100-Ω load resistor connected between L and ground and
one connected between R and ground, then connect the noise meter.
Measurement of the CLEAN Output Values
1.
Set the panel buttons and controls as shown below.
SELECT:
CLEAN VOLUME:
LEAD TYPE:
GAIN:
VOLUME:
EQUALIZER BASS:
MIDDLE:
TREBLE:
POWER SQUEEZER:
2.
Connect the signal generator to the INPUT jack and input a 1-kHz sine
wave at -40 dBm.
3.
Verify that the output value between the red and black speaker wires is
+2.0±2.0 dBm.
4.
Connect the signal generator to the left channel of the AUX IN connector
and input a 1-kHz sine wave at -20 dBm.
5.
Verify that the output value between the red and black speaker wires is -
3.0±2.0 dBm.
6.
Connect the signal generator to the right channel of the AUX IN connector
and input a 1-kHz sine wave at -20 dBm.
7.
Verify that the output value between the red and black speaker wires is -
3.0±2.0 dBm.
Measurement of the LEAD Output Values
1.
Set the panel buttons and controls as shown below.
SELECT:
CLEAN VOLUME:
LEAD TYPE:
GAIN:
VOLUME:
EQUALIZER BASS:
MIDDLE:
TREBLE:
POWER SQUEEZER:
2.
Input a 300-Hz sine wave at -60 dBm to the INPUT jack.
3.
Set LEAD TYPE to OVERDRIVE, and verify that the output value
between the red and black speaker wires is +1.5±2.0 dBm.
4.
Set LEAD TYPE to DISTORTION, and verify that the output value
between the red and black speaker wires is +8.0±2.0 dBm.
10
CLEAN
10
OVERDRIVE
10
10
10
10
10
OFF
LEAD
10
Refer to step 3 and after.
10
10
10
10
10
OFF
5.
Set LEAD TYPE to METAL ZONE, and verify that the output value
between the red and black speaker wires is +14.5±2.0 dBm.
6.
Set LEAD TYPE to EXTREME, and verify that the output value between
the red and black speaker wires is +3.0±2.0 dBm.
Measurement of the POWER SQUEEZER
Output Value
1.
Set the panel buttons and controls as shown below.
SELECT:
CLEAN VOLUME:
LEAD TYPE:
GAIN:
VOLUME:
EQUALIZER BASS:
MIDDLE:
TREBLE:
POWER SQUEEZER:
2.
Input a 4-kHz sine wave at -60 dBm to the INPUT jack.
3.
Verify that the output value between the red and black speaker wires is
+2.0±2.0 dBm.
Measurement of the EQUALIZER Output
Values
1.
Set the panel buttons and controls as shown below.
SELECT:
CLEAN VOLUME:
LEAD TYPE:
GAIN:
VOLUME:
EQUALIZER BASS:
MIDDLE:
TREBLE:
POWER SQUEEZER:
2.
Input a 100-Hz sine wave at -40 dBm to the INPUT jack.
3.
Adjust the EQUALIZER BASS control to 10, then 0, then 10, and verify
that the output value between the red and black speaker wires changes as
shown below. After verifying, adjust the control to 10.
When at 10: +6.5±2.0 dBm
When at 0: -1.5±2.0 dBm
4.
Input a 1-kHz sine wave at -40 dBm to the INPUT jack.
5.
Adjust the EQUALIZER MIDDLE control to 10, then 0, then 10, and
verify that the output value between the red and black speaker wires
changes as shown below. After verifying, adjust the control to 10.
When at 10: +2.0±2.0 dBm
When at 0:
-5.5±2.0 dBm
6.
Input a 10-kHz sine wave at -40 dBm to the INPUT jack.
7.
Adjust the EQUALIZER TREBLE control to 10, then 0, then 10, and
verify that the output value between the red and black speaker wires
changes as shown below. After verifying, adjust the control to 10.
When at 10:
+17.5±2.0 dBm
When at 0: +9.5±2.0 dBm
CUBE-15XL
LEAD
10
EXTREME
10
10
10
10
10
ON
CLEAN
10
EXTREME
10
10
10 (changed in step 3)
10 (changed in step 5)
10 (changed in step 7)
OFF